The objective of this study was to determine effects of supplementing coastal bermudagrass (Cynodon dactylon; CBG) hay with Strophostyles helvula (98 g kg-1 crude protein (CP), 476 g kg-1 neutral detergent fiber (NDF)), S. leiosperma (117 g kg-1 CP, 497 g kg-1 NDF), or cottonseed meal (506 g kg-1 CP, 352 g kg-1 NDF; CSM) upon intake of CBG hay (127 g kg-1 CP, 691 g kg-1 NDF) and apparent digestibility of dietary organic matter (OM), NDF, and true digestibility of CP. Six Boer-Spanish goats (46.22 +- 3.99 Kg) were fed CBG plus S. helvula, S. leiosperma, or CSM at 0.34 and 0.68% of BW in a 6*6 Latin square with 3*2 factorial arrangement of treatments. The CBG was fed ad libitum, and the legumes/CSM were fed in two equal daily feedings during a 7-d adjustment period and 7-d collection period in metabolism crates. Feces were collected every 24-h, and CBG, legumes/CSM, and fecal samples were analyzed for OM, NDF, and CP. There were no supplement type*amount interactions (P > 0.05). Supplement type did not affect OM digestibility (P = 0.21), but OM digestibility increased 6.4% (P = 0.05) at the 0.68% versus 0.34% level of supplementation with the legumes or CSM. Supplementation with CSM and S. leiosperma improved NDF digestibility 7% versus supplementation with S. helvula (P = 0.02); and as supplement amount increased NDF digestibility by 5.5% (P = 0.02). The diet supplemented with CSM had the greatest CP digestibility, and S. helvula CP was 6% less digestible than S. leiosperma (P = 0.02). As supplement amount increased, CP digestibility increased 7% (P = 0.01). Intake of DM, OM, and NDF of CBG was unaffected (P = 0.56) by supplementation with CSM, S. helvula, and S. leiosperma, but total diet NDF intake of diets supplemented with CSM and S. helvula was 10.5% less than diet supplemented with S. leiosperma (P = 0.01). Considering digestibility and intake, CSM and S. leiosperma were the best supplements fed in this experiment. Strophostyles leiosperma is recommended as use for diet supplementation for goats when CBG hay basal diet is fed.

For this study 14 lambs were obtained, which were split into two groups; a control group (CON) and a group that was supplemented Reed Sedge Peat (RSP). We wanted to test whether RSP could decrease stress at weaning, increase immune response and also increase digestibility of the animal. Lambs were subjected to an ACTH challenge 48 hours post weaning. After weaning (d 28 of study) 10 of the lambs (5 CON; 5 RSP) also underwent a digestibility challenge. We found that there was no difference (P = 0.8764) within cortisol concentration during the weaning portion of the study between the two treatment groups. During the ACTH challenger there was a difference between RSP group and CON, where RSP had a decrease in cortisol concentration (P = 0.0892). There was no difference in blood cell parameters, except for SEG, % (P = 0.0890) where RSP had greater % of SEG than CON group. Within the digestibility trail there was a decrease in digestibility within the RSP group compared to CON, within DM, OM, NDF and ADF (P = 0.0458; P = 0.0430; P = 0.0509; P = 0.0786; respectively).

Particle size distribution of diet, feces, and change from diet to feces, as well as apparent digestibility (aDig, %) of selected nutrients, and novel fecal microbiome identification of mature female leopard tortoises (Stigmochelys pardalis, n = 16) fed exclusively one of three, nutritionally complete, pelleted diets were evaluated in a blind, complete randomized design study. Two diets included insoluble fiber (powdered cellulose) consisting of either 2.0 mm or 0.2 mm length. Insoluble fiber provides nutritional and physical benefits to both the animal host and the microorganisms that inhabit the gastrointestinal tract. Insoluble fiber length was used as a means of evaluating a physically effective fiber (peNDF) definition for hindgut-fermenting vertebrates. Numerical trends of each diet particle size distribution indicated a greater amount of particle recovery on the 2.0 mm sieve for the 2.0 mm diet, and a greater particle recovery on the 0.125 mm sieve for the 0.2 mm diet, both as expected based on the added fiber lengths. Fecal particle size distributions were not different between diets, however, distributions of the change in particle size from diet to feces were different between diets. Similar fecal particle size distributions across diets suggests both cellulose lengths are below the peNDF threshold of the leopard tortoise. Apparent digestibility (aDig, %) of dry matter (DM) and organic matter (OM) was not different based on diet, method, or a diet and method interaction; aDig (%) of neutral detergent fiber (aNDF) and sequential acid detergent fiber (sADF) was different based only on diet. These results suggest that while aDig (%) of OM did not change, the source of OM digestibility shifted, as both aNDF and sADF digestibility increased with the cellulose-added diets compared to the control diet. An increase in insoluble fiber digestibility suggests an "effectiveness" of the cellulose lengths. At both bacterial phyla and genera levels, fecal microbiomes were more similar between tortoises fed the cellulose-added diets versus the control diet, suggesting that the hindgut microbial communities adjusted in the hindgut of the tortoises fed the cellulose-added diets by shifting proportions of microbes, based on their role in the hindgut (i.e., cellulose digestion), to accommodate for the addition of cellulose in the two treatment diets. This may explain the similarity among fecal particle size distributions, and suggests that adaptability of the hindgut microbial communities should be considered when defining peNDF for hindgut-fermenting vertebrates.

FundaÃÃo de Amparo à Pesquisa do Estado do Cearà / In order to evaluate the effects of replacing corn for broken rice (QA) and the inclusion of parboiled rice bran (FIAP) in rations for meat quails, two experiments were conducted in the period 7 to 49 days age. In each trial, 288 quails with seven days of age were distributed in a completely randomized design with six treatments and six replications of eight birds for experimental unit. In the first experiment, was tested the levels of 0, 20, 40, 60, 80 and 100% of replacement corn by broken rice and it was observed that the replacement of corn for broken rice did not significantly influence the performance and carcass characteristics of quails at different stages of creation, neither economic viability. In the second experiment, the treatments were a control diet without the inclusion of FIAP, and the other containing 5, 10, 15, 20 and 25% of FIAP. There was a linear decrease in the apparent digestibility of dry matter (CDMS) and crude energy (CDEB) and a linear increase of apparent metabolizable energy (EMA) and apparent metabolizable energy corrected for nitrogen (EMAn) with the inclusion of FIAP in rations, above 5%. Therefore, there was a linear decrease in feed intake and weight gain, without influence in feed conversion, carcass characteristics and parameters of bone quality. Although there was some reduction parameters when FIAP increased above 5%, the performance of birds fed with different levels of FIAP was similar in relation to the control group. Furthermore, the use until 25% of FIAP provided better economic viability. It can be argued that the broken rice can replace corn in the feeding of meat quails at levels up to 100%, while the FIAP can be included in rations in proportions of up to 25% without affecting carcass characteristics. / Com o objetivo de avaliar os efeitos da substituiÃÃo do milho por quirera de arroz (QA) e da inclusÃo do farelo integral de arroz parboilizado (FIAP) nas raÃÃes de codornas do tipo corte, foram realizados dois experimentos no perÃodo de 7 a 49 dias de idade. Em cada experimento, 288 codornas com sete dias de idade foram distribuÃdas em um delineamento inteiramente casualizado, com seis tratamentos e seis repetiÃÃes de oito aves por unidade experimental. No primeiro experimento, foram testados os nÃveis de 0, 20, 40, 60, 80 e 100% de substituiÃÃo do milho pela quirera de arroz e observou-se que nÃo houve influencia significativa sobre o desempenho e as caracterÃsticas de carcaÃa das aves, nas diferentes fases de criaÃÃo, nem tÃo pouco sobre a viabilidade econÃmica. No segundo experimento, os tratamentos consistiram de uma raÃÃo controle, sem a inclusÃo de FIAP, e as demais contendo 5, 10, 15, 20 e 25% de FIAP. Houve decrÃscimo linear nos coeficientes de digestibilidade da matÃria seca (CDMS) e energia bruta (CDEB), bem como aumento linear da energia metabolizÃvel aparente (EMA) e energia metabolizÃvel aparente corrigida para nitrogÃnio (EMAn) com a inclusÃo do FIAP nas raÃÃes, acima de 5%. Observou-se ainda reduÃÃo linear no consumo de raÃÃo e ganho de peso, sem, contudo influenciar na conversÃo alimentar, caracterÃsticas de carcaÃa e parÃmetros de qualidade Ãssea. Embora tenha ocorrido reduÃÃo de alguns parÃmetros, quando se aumentou o FIAP acima de 5%, nÃo houve prejuÃzo significativo nos resultados de desempenho das aves alimentadas com os diferentes nÃveis do FIAP em relaÃÃo Ãs do grupo controle. O uso de atà 25% de FIAP proporcionou a melhor viabilidade econÃmica. Pode-se afirmar que a quirera de arroz pode substituir o milho na alimentaÃÃo de codornas de corte em nÃveis de atà 100%, enquanto, o FIAP pode ser incluÃdo nas raÃÃes em proporÃÃes de atà 25%, sem afetar as caracterÃsticas de carcaÃa.

Made available in DSpace on 2017-07-10T19:24:29Z (GMT). No. of bitstreams: 1 LEANDRO BOHNENBERGER.pdf: 1385012 bytes, checksum: 8cb9261c7084a7005906fd2de4b19855 (MD5) Previous issue date: 2008-07-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Although cassava leaves are rich in proteins, vitamins and minerals and are easily found at low prices, their direct consumption is limited due to the presence of anti-nutritious and/or toxic substances. Aiming to create alternatives to the use of these leaves, the present paper aimed to determine the coefficients of apparent digestibility (AD) from the dry matter (DM), crude protein (CP) and crude energy (CE) of cassava leaf protein concentrate (CLPC) for Nile Tilapia, and to evaluate its inclusion in Nile Tilapia food. The CLPC has been extracted through isoeletric precipitation, method described by CEREDA & VILPOUX (2003). In the CLPC, it has been determined the perceptual of crude protein (CP), ether extract (EE), ashes, dry matter (DM) and crude energy (CE), which have shown 48.42%, 13.57%, 3.48%, 93.01% and 5527 Kcal/kg., respectively. 24 tilapias with an average weight of 86.92 ± 36.70 g have been used. The animals have been submitted to fecal collection methodology, through sedimentation, in tanks with funneled shapes. The DM, CP, and CE of CLPC have presented AD of 33.06%, 66.57% and 30.06%, respectively, thus, showing digestible protein and energy values of 32.23% and 1661.13 kcal of DE/kg. In order to evaluate CLPC inclusion in Nile Tilapia food, 300 larvae at the age of 7 days old have been used, which were distributed in 20 aquariums with capacity for 30 liters of useful volume, in a fully randomized outline with five treatments and four repetitions, pointing out that the experimental unit is consisted of an aquarium with 15 tilapia larvae. Five isoproteic and isoenergetic diets have been elaborated containing 38.6% of digestible protein and 3300 kcal of DE/kg of diets with level of 0, 5, 10, 15 and 20% of CLPC inclusion. At the end of the experimental time, differences have not been noticed (W>0.05) on the final average weight, weight gain, final length and survival of larvae which were fed with diets containing CLPC. It is concluded that CLPC is a protean food and it may be used in diets for tilapia in initial phase in up to 20% of inclusion without causing performance and survival harms. / Folhas de mandioca são ricas em proteínas, vitaminas e minerais e, apesar de serem facilmente encontradas a baixo custo, seu consumo direto fica limitado devido à presença de substâncias antinutritivas e/ou tóxicas. Na busca de criar alternativas para o uso dessas folhas, o presente trabalho objetivou determinar os coeficientes de digestibilidade aparente (CD) da matéria seca (MS), proteína bruta (PB), e energia bruta (EB) do concentrado protéico de folhas de mandioca (CPFM) para a tilápia do Nilo, e avaliar sua inclusão na alimentação da tilápia. O concentrado foi extraído das folhas de mandioca por precipitação isoelétrica, método descrito por CEREDA & VILPOUX (2003). Foram determinados no concentrado protéico de folhas de mandioca (CPFM) o percentual de proteína bruta (PB), extrato etéreo (EE), cinzas, matéria seca (MS) e energia bruta (EB), que apresentaram, 48,42%, 13,57%, 3,48%, 93,01% e 5527 Kcal/Kg, respectivamente. Foram utilizadas 24 tilápias com peso médio de 86,92 ± 36,70g. Os animais foram submetidos à metodologia de coleta de fezes, por sedimentação, em tanques afunilados. A MS, PB e EB do CPFM apresentaram CD de 33,06%, 66,57% e 30,06%, respectivamente. Apresentando valores de proteína e energia digestíveis de 32,23% e 1661,13 Kcal de ED/Kg. Para avaliar a inclusão do CPFM na alimentação da tilápia, foram utilizadas 300 larvas com idade de sete dias, distribuídas em 20 aquários com capacidade para 30 L de volume útil, em um delineamento inteiramente casualizado, com cinco tratamentos e quatro repetições, sendo a unidade experimental constituída por um aquário com 15 larvas de tilápia. Foram elaboradas cinco rações isoprotéicas e isoenergéticas com 38,6% de proteína digestível e 3300 Kcal de ED/Kg de ração com níveis de 0, 5, 10, 15 e 20% de inclusão do CPFM. Ao final do período experimental, não foram observadas diferenças (P>0,05) nas médias de peso final, ganho de peso, comprimento final e sobrevivência das larvas alimentadas com rações, incluindo CPFM. Conclui-se que o CPFM é um alimento protéico e que pode ser utilizado em rações para tilápias em fase inicial em até 20% de inclusão sem causar prejuízos no desempenho e sobrevivência.

Made available in DSpace on 2017-05-12T14:47:48Z (GMT). No. of bitstreams: 1 LEANDRO BOHNENBERGER.pdf: 1385012 bytes, checksum: 8cb9261c7084a7005906fd2de4b19855 (MD5) Previous issue date: 2008-07-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Although cassava leaves are rich in proteins, vitamins and minerals and are easily found at low prices, their direct consumption is limited due to the presence of anti-nutritious and/or toxic substances. Aiming to create alternatives to the use of these leaves, the present paper aimed to determine the coefficients of apparent digestibility (AD) from the dry matter (DM), crude protein (CP) and crude energy (CE) of cassava leaf protein concentrate (CLPC) for Nile Tilapia, and to evaluate its inclusion in Nile Tilapia food. The CLPC has been extracted through isoeletric precipitation, method described by CEREDA & VILPOUX (2003). In the CLPC, it has been determined the perceptual of crude protein (CP), ether extract (EE), ashes, dry matter (DM) and crude energy (CE), which have shown 48.42%, 13.57%, 3.48%, 93.01% and 5527 Kcal/kg., respectively. 24 tilapias with an average weight of 86.92 ± 36.70 g have been used. The animals have been submitted to fecal collection methodology, through sedimentation, in tanks with funneled shapes. The DM, CP, and CE of CLPC have presented AD of 33.06%, 66.57% and 30.06%, respectively, thus, showing digestible protein and energy values of 32.23% and 1661.13 kcal of DE/kg. In order to evaluate CLPC inclusion in Nile Tilapia food, 300 larvae at the age of 7 days old have been used, which were distributed in 20 aquariums with capacity for 30 liters of useful volume, in a fully randomized outline with five treatments and four repetitions, pointing out that the experimental unit is consisted of an aquarium with 15 tilapia larvae. Five isoproteic and isoenergetic diets have been elaborated containing 38.6% of digestible protein and 3300 kcal of DE/kg of diets with level of 0, 5, 10, 15 and 20% of CLPC inclusion. At the end of the experimental time, differences have not been noticed (W>0.05) on the final average weight, weight gain, final length and survival of larvae which were fed with diets containing CLPC. It is concluded that CLPC is a protean food and it may be used in diets for tilapia in initial phase in up to 20% of inclusion without causing performance and survival harms. / Folhas de mandioca são ricas em proteínas, vitaminas e minerais e, apesar de serem facilmente encontradas a baixo custo, seu consumo direto fica limitado devido à presença de substâncias antinutritivas e/ou tóxicas. Na busca de criar alternativas para o uso dessas folhas, o presente trabalho objetivou determinar os coeficientes de digestibilidade aparente (CD) da matéria seca (MS), proteína bruta (PB), e energia bruta (EB) do concentrado protéico de folhas de mandioca (CPFM) para a tilápia do Nilo, e avaliar sua inclusão na alimentação da tilápia. O concentrado foi extraído das folhas de mandioca por precipitação isoelétrica, método descrito por CEREDA & VILPOUX (2003). Foram determinados no concentrado protéico de folhas de mandioca (CPFM) o percentual de proteína bruta (PB), extrato etéreo (EE), cinzas, matéria seca (MS) e energia bruta (EB), que apresentaram, 48,42%, 13,57%, 3,48%, 93,01% e 5527 Kcal/Kg, respectivamente. Foram utilizadas 24 tilápias com peso médio de 86,92 ± 36,70g. Os animais foram submetidos à metodologia de coleta de fezes, por sedimentação, em tanques afunilados. A MS, PB e EB do CPFM apresentaram CD de 33,06%, 66,57% e 30,06%, respectivamente. Apresentando valores de proteína e energia digestíveis de 32,23% e 1661,13 Kcal de ED/Kg. Para avaliar a inclusão do CPFM na alimentação da tilápia, foram utilizadas 300 larvas com idade de sete dias, distribuídas em 20 aquários com capacidade para 30 L de volume útil, em um delineamento inteiramente casualizado, com cinco tratamentos e quatro repetições, sendo a unidade experimental constituída por um aquário com 15 larvas de tilápia. Foram elaboradas cinco rações isoprotéicas e isoenergéticas com 38,6% de proteína digestível e 3300 Kcal de ED/Kg de ração com níveis de 0, 5, 10, 15 e 20% de inclusão do CPFM. Ao final do período experimental, não foram observadas diferenças (P>0,05) nas médias de peso final, ganho de peso, comprimento final e sobrevivência das larvas alimentadas com rações, incluindo CPFM. Conclui-se que o CPFM é um alimento protéico e que pode ser utilizado em rações para tilápias em fase inicial em até 20% de inclusão sem causar prejuízos no desempenho e sobrevivência.

O presente trabalho objetivou avaliar os impactos de níveis de suplementação concentrada sobre parâmetros de consumo e digestibilidade aparente dos componentes da dieta total em ovinos, mensurando a magnitude dos efeitos associativos (EA) entre o suplemento concentrado e volumoso de baixa qualidade. Utilizou-se 16 ovinos machos, castrados, da raça Corriedale, com sete meses de idade e peso vivo (PV) médio inicial de 33,62 + 1,81 kg. Os animais foram dosificados preventivamente com vermífugo, receberam a dosagem de complexo vitamínico ADE e passaram por um período de adaptação de 15 dias. Utilizou-se quatro repetições por tratamento (níveis de inclusão de suplemento na dieta de 0; 0,33; 0,66; e 1% do PV) em um delineamento completamente casualizado. As dietas experimentais foram compostas pelo fornecimento de um suplemento concentrado, a base de farelo de soja, farelo de milho e farinha de mandioca, aliado a oferta ad libitum de feno de baixa qualidade, oriundo de pastagem natural diferida, da região da depressão central do Estado do Rio Grande do Sul. As avaliações foram realizadas em dois períodos de 21 dias cada. Os animais foram alocados em baias individuais com comedouros separados para o fornecimento de alimento e água. Os parâmetros de consumo de matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), fibra em detergente neutro (FDN) e ácido (FDA) e energia bruta (EB) do volumoso não sofreram influência dos tratamentos, mostrando a ausência de efeitos associativos (EA) positivos e negativos. Os parâmetros de consumo total de MS, MO, PB, EB e água, foram influenciados de maneira linear crescente pelos tratamentos (P<0,0001). Já os de FDN e FDA não sofreram efeito. Todos os parâmetros de digestibilidade apresentaram comportamento linear crescente, conforme o nível de suplementação foi acrescido, exceto os da FDN e FDA que se mantiveram estáveis. A digestibilidade da MS foi afetada linearmente (P<0,0001), enquanto as digestibilidades da MO, nitrogênio e EB apresentaram comportamento quadrático (P=0,0433; <0,0001 e 0,0479, respectivamente). O balanço nitrogenado diário apresentou comportamento linear crescente (P<0,0001). O EA da digestibilidade apresentou comportamento crescente quadrático (P=0,0461). A suplementação, em um contexto geral, apresentou efeitos benéficos, maximizando o consumo de nutrientes da dieta total, bem como sua digestibilidade. / This study aimed to evaluate the impact of levels of concentrate supplementation on parameters of intake and digestibility of the components of the total diet in sheep, measuring the magnitude of associative effects (AE) between concentrate suplement and forage of low quality. It was used 16 wethers, Corriedale, with seven months of age and initial body weight (BW) of 33.62 + 1.81 kg. The animals were dosed preventatively with dewormer, received the dosage of vitamin complex ADE and went through an adjustment period of 15 days.It was used four replicates per treatment (inclusion levels of supplement in the diet of 0, 0.33, 0.66, and 1% of BW) in a completely randomized design. The experimental diets were composed by supplying a concentrated supplement, base of soybean meal, corn bran and cassava flour, combined with ad libitum supply of low quality hay, arising from deferred natural grassland of the central depression region of State of Rio Grande do Sul. Evaluations were performed in two periods of 21 days each. The animals were placed in individual stalls with separate supply of food and water feeders. The parameters of intake of dry matter (DM), organic matter (OM), crude protein (CP), neutral and acid detergent fiber (NDF and FDA) and gross energy (GE) of roughage were not influenced by treatments, showing the absence of positive or negative associative effects (AE). The parameters of total intake of DM, OM, CP, EB and water, were influenced in a linear way by the treatments (P <0.0001). But NDF and ADF were not affected. All digestibility parameters showed a linear increasing behavior as the level of supplementation was increased, except that of NDF and ADF were stable. DM digestibility was affected linearly (P <0.0001), while the digestibility of OM, nitrogen and EB showed a quadratic response (P = 0.0433, <0.0001 and 0.0479, respectively). The daily nitrogen balance showed linear increase (P <0.0001). The AE of digestibility showed quadratic behavior (P = 0.0461). Supplementation, in a general context, showed beneficial effects, maximizing nutrient intake of the total diet and its digestibility.

O presente trabalho objetivou avaliar os impactos de níveis de suplementação concentrada sobre parâmetros de consumo e digestibilidade aparente dos componentes da dieta total em ovinos, mensurando a magnitude dos efeitos associativos (EA) entre o suplemento concentrado e volumoso de baixa qualidade. Utilizou-se 16 ovinos machos, castrados, da raça Corriedale, com sete meses de idade e peso vivo (PV) médio inicial de 33,62 + 1,81 kg. Os animais foram dosificados preventivamente com vermífugo, receberam a dosagem de complexo vitamínico ADE e passaram por um período de adaptação de 15 dias. Utilizou-se quatro repetições por tratamento (níveis de inclusão de suplemento na dieta de 0; 0,33; 0,66; e 1% do PV) em um delineamento completamente casualizado. As dietas experimentais foram compostas pelo fornecimento de um suplemento concentrado, a base de farelo de soja, farelo de milho e farinha de mandioca, aliado a oferta ad libitum de feno de baixa qualidade, oriundo de pastagem natural diferida, da região da depressão central do Estado do Rio Grande do Sul. As avaliações foram realizadas em dois períodos de 21 dias cada. Os animais foram alocados em baias individuais com comedouros separados para o fornecimento de alimento e água. Os parâmetros de consumo de matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), fibra em detergente neutro (FDN) e ácido (FDA) e energia bruta (EB) do volumoso não sofreram influência dos tratamentos, mostrando a ausência de efeitos associativos (EA) positivos e negativos. Os parâmetros de consumo total de MS, MO, PB, EB e água, foram influenciados de maneira linear crescente pelos tratamentos (P<0,0001). Já os de FDN e FDA não sofreram efeito. Todos os parâmetros de digestibilidade apresentaram comportamento linear crescente, conforme o nível de suplementação foi acrescido, exceto os da FDN e FDA que se mantiveram estáveis. A digestibilidade da MS foi afetada linearmente (P<0,0001), enquanto as digestibilidades da MO, nitrogênio e EB apresentaram comportamento quadrático (P=0,0433; <0,0001 e 0,0479, respectivamente). O balanço nitrogenado diário apresentou comportamento linear crescente (P<0,0001). O EA da digestibilidade apresentou comportamento crescente quadrático (P=0,0461). A suplementação, em um contexto geral, apresentou efeitos benéficos, maximizando o consumo de nutrientes da dieta total, bem como sua digestibilidade. / This study aimed to evaluate the impact of levels of concentrate supplementation on parameters of intake and digestibility of the components of the total diet in sheep, measuring the magnitude of associative effects (AE) between concentrate suplement and forage of low quality. It was used 16 wethers, Corriedale, with seven months of age and initial body weight (BW) of 33.62 + 1.81 kg. The animals were dosed preventatively with dewormer, received the dosage of vitamin complex ADE and went through an adjustment period of 15 days.It was used four replicates per treatment (inclusion levels of supplement in the diet of 0, 0.33, 0.66, and 1% of BW) in a completely randomized design. The experimental diets were composed by supplying a concentrated supplement, base of soybean meal, corn bran and cassava flour, combined with ad libitum supply of low quality hay, arising from deferred natural grassland of the central depression region of State of Rio Grande do Sul. Evaluations were performed in two periods of 21 days each. The animals were placed in individual stalls with separate supply of food and water feeders. The parameters of intake of dry matter (DM), organic matter (OM), crude protein (CP), neutral and acid detergent fiber (NDF and FDA) and gross energy (GE) of roughage were not influenced by treatments, showing the absence of positive or negative associative effects (AE). The parameters of total intake of DM, OM, CP, EB and water, were influenced in a linear way by the treatments (P <0.0001). But NDF and ADF were not affected. All digestibility parameters showed a linear increasing behavior as the level of supplementation was increased, except that of NDF and ADF were stable. DM digestibility was affected linearly (P <0.0001), while the digestibility of OM, nitrogen and EB showed a quadratic response (P = 0.0433, <0.0001 and 0.0479, respectively). The daily nitrogen balance showed linear increase (P <0.0001). The AE of digestibility showed quadratic behavior (P = 0.0461). Supplementation, in a general context, showed beneficial effects, maximizing nutrient intake of the total diet and its digestibility.

O presente trabalho objetivou avaliar os impactos de níveis de suplementação concentrada sobre parâmetros de consumo e digestibilidade aparente dos componentes da dieta total em ovinos, mensurando a magnitude dos efeitos associativos (EA) entre o suplemento concentrado e volumoso de baixa qualidade. Utilizou-se 16 ovinos machos, castrados, da raça Corriedale, com sete meses de idade e peso vivo (PV) médio inicial de 33,62 + 1,81 kg. Os animais foram dosificados preventivamente com vermífugo, receberam a dosagem de complexo vitamínico ADE e passaram por um período de adaptação de 15 dias. Utilizou-se quatro repetições por tratamento (níveis de inclusão de suplemento na dieta de 0; 0,33; 0,66; e 1% do PV) em um delineamento completamente casualizado. As dietas experimentais foram compostas pelo fornecimento de um suplemento concentrado, a base de farelo de soja, farelo de milho e farinha de mandioca, aliado a oferta ad libitum de feno de baixa qualidade, oriundo de pastagem natural diferida, da região da depressão central do Estado do Rio Grande do Sul. As avaliações foram realizadas em dois períodos de 21 dias cada. Os animais foram alocados em baias individuais com comedouros separados para o fornecimento de alimento e água. Os parâmetros de consumo de matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), fibra em detergente neutro (FDN) e ácido (FDA) e energia bruta (EB) do volumoso não sofreram influência dos tratamentos, mostrando a ausência de efeitos associativos (EA) positivos e negativos. Os parâmetros de consumo total de MS, MO, PB, EB e água, foram influenciados de maneira linear crescente pelos tratamentos (P<0,0001). Já os de FDN e FDA não sofreram efeito. Todos os parâmetros de digestibilidade apresentaram comportamento linear crescente, conforme o nível de suplementação foi acrescido, exceto os da FDN e FDA que se mantiveram estáveis. A digestibilidade da MS foi afetada linearmente (P<0,0001), enquanto as digestibilidades da MO, nitrogênio e EB apresentaram comportamento quadrático (P=0,0433; <0,0001 e 0,0479, respectivamente). O balanço nitrogenado diário apresentou comportamento linear crescente (P<0,0001). O EA da digestibilidade apresentou comportamento crescente quadrático (P=0,0461). A suplementação, em um contexto geral, apresentou efeitos benéficos, maximizando o consumo de nutrientes da dieta total, bem como sua digestibilidade. / This study aimed to evaluate the impact of levels of concentrate supplementation on parameters of intake and digestibility of the components of the total diet in sheep, measuring the magnitude of associative effects (AE) between concentrate suplement and forage of low quality. It was used 16 wethers, Corriedale, with seven months of age and initial body weight (BW) of 33.62 + 1.81 kg. The animals were dosed preventatively with dewormer, received the dosage of vitamin complex ADE and went through an adjustment period of 15 days.It was used four replicates per treatment (inclusion levels of supplement in the diet of 0, 0.33, 0.66, and 1% of BW) in a completely randomized design. The experimental diets were composed by supplying a concentrated supplement, base of soybean meal, corn bran and cassava flour, combined with ad libitum supply of low quality hay, arising from deferred natural grassland of the central depression region of State of Rio Grande do Sul. Evaluations were performed in two periods of 21 days each. The animals were placed in individual stalls with separate supply of food and water feeders. The parameters of intake of dry matter (DM), organic matter (OM), crude protein (CP), neutral and acid detergent fiber (NDF and FDA) and gross energy (GE) of roughage were not influenced by treatments, showing the absence of positive or negative associative effects (AE). The parameters of total intake of DM, OM, CP, EB and water, were influenced in a linear way by the treatments (P <0.0001). But NDF and ADF were not affected. All digestibility parameters showed a linear increasing behavior as the level of supplementation was increased, except that of NDF and ADF were stable. DM digestibility was affected linearly (P <0.0001), while the digestibility of OM, nitrogen and EB showed a quadratic response (P = 0.0433, <0.0001 and 0.0479, respectively). The daily nitrogen balance showed linear increase (P <0.0001). The AE of digestibility showed quadratic behavior (P = 0.0461). Supplementation, in a general context, showed beneficial effects, maximizing nutrient intake of the total diet and its digestibility.

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