Orientador:Marcelo Vasconcelos Meireles / Co-orientador:Max José de Araújo Faria Júnior / Co-orientador:Manoel Garcia Neto / Banca:Leda Gobbo de Freitas Bueno / Banca:Wilson Machado de Souza / Resumo:O calor limita a produção de frangos de corte. Este trabalho avaliou as interações entre termocondicionamento precoce (TCP) e o uso do equilíbrio eletrolítico (EE), sobre o desempenho e características da carcaça das aves. Assim, o balanço eletrolítico (BE = Na + K - Cl), foi ajustado em 350mEq/kg e a relação eletrolítica (K+Cl)/Na em 3:1, pelo programa PPFR. O experimento foi realizado no setor de Zootecnia da Faculdade de Medicina Veterinária de Araçatuba/UNESP. Alojaram-se 240 pintos machos de 1 dia de idade, linhagem Cobb-500®, em bateria metálica com 24 divisões e aquecimento elétrico automático. O delineamento experimental foi inteiramente ao acaso, em arranjo fatorial 2x2, totalizando 4 tratamentos com 6 repetições e 10 aves por parcela experimental. O TCP ocorreu no 5º dia de idade, por 24 horas a 36,5°C, em metade do lote. Posteriormente, as aves foram transferidas para um galpão climatizado e alojadas em boxes, da mesma forma que a outra parcela que não passou pelo TCP. Avaliaram-se os efeitos do estresse calórico crônico (6 horas a 32°C) aplicado do 35º ao 39º dia de idade. Foram monitorados a temperatura e umidade do ar, bem como a temperatura de globo negro. Alimentação e água foram fornecidas ad libitum. Calcularam-se os dados de desempenho zootécnico e a taxa de mortalidade das aves. Submeteram-se os resultados à análise de variância e comparação de médias pelo teste de Tukey. Não houve interação entre o TCP e o EE sobre o desempenho e características da carcaça das aves. As estratégias, TCP e EE mostraram-se ineficazes a fim de amenizar os efeitos do estresse calórico crônico em frangos de corte / Abstract:The heat limits the production of broilers. This study evaluated the interactions between early thermal conditioning (ETC) and the electrolyte balance (EB) on performance and characteristics of birds' carcass. Thus, the electrolyte balance (BE = Na+ + K+ - Cl- ), was set to 350mEq/kg and electrolyte ratio (K+ + Cl- )/ Na+ in 3:1 by PPFR program. The experiment was carried out at the Animal Science department of the Faculty of Veterinary Medicine of Araçatuba / UNESP. It was used 240 male chicks of 1 day old, Cobb-500®, lodged in metal batteries with 24 divisions and automatic electric heating. The experimental design was completely randomized in a factorial arrangement 2x2, totaling 4 treatments with 6 replicates and 10 birds per experimental plot. ETC occurred on the 5th day of age for 24 hours at 36.5 °C in half of the batch. Subsequently, these birds were transferred to an environmentally controlled shed and were grown in boxes, in the same way as the other half that not received ETC treatment. The effects of chronic heat stress (6 hours at 32 °C) applied from the 35th through the 39th day of age were evaluated. Temperature and air humidity, as well black-globe temperature were monitored electronically. Food and water were provided ad libitum. The growth performance data and the mortality rate of birds were measured. The results were subjected to analysis of variance and comparison of means was done by Tukey test. There were no interaction effects between ETC and EB on performance and characteristics of birds' carcass. The strategies ETC and EB proved to be ineffective in order to mitigate the effects of chronic heat stress in broilers / Mestre

Made available in DSpace on 2016-06-07T17:12:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-08-06. Added 1 bitstream(s) on 2016-06-07T17:16:58Z : No. of bitstreams: 1 000864744.pdf: 2407312 bytes, checksum: 10fe8efab5b26398740fcfe1df7ac526 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / The heat limits the production of broilers. This study evaluated the interactions between early thermal conditioning (ETC) and the electrolyte balance (EB) on performance and characteristics of birds' carcass. Thus, the electrolyte balance (BE = Na+ + K+ - Cl- ), was set to 350mEq/kg and electrolyte ratio (K+ + Cl- )/ Na+ in 3:1 by PPFR program. The experiment was carried out at the Animal Science department of the Faculty of Veterinary Medicine of Araçatuba / UNESP. It was used 240 male chicks of 1 day old, Cobb-500®, lodged in metal batteries with 24 divisions and automatic electric heating. The experimental design was completely randomized in a factorial arrangement 2x2, totaling 4 treatments with 6 replicates and 10 birds per experimental plot. ETC occurred on the 5th day of age for 24 hours at 36.5 °C in half of the batch. Subsequently, these birds were transferred to an environmentally controlled shed and were grown in boxes, in the same way as the other half that not received ETC treatment. The effects of chronic heat stress (6 hours at 32 °C) applied from the 35th through the 39th day of age were evaluated. Temperature and air humidity, as well black-globe temperature were monitored electronically. Food and water were provided ad libitum. The growth performance data and the mortality rate of birds were measured. The results were subjected to analysis of variance and comparison of means was done by Tukey test. There were no interaction effects between ETC and EB on performance and characteristics of birds' carcass. The strategies ETC and EB proved to be ineffective in order to mitigate the effects of chronic heat stress in broilers

Submitted by DANILO GUALBERTO DE SANDRE null (danilo.sandre@hotmail.com) on 2016-07-14T21:57:39Z No. of bitstreams: 1 TESE e ARTIGO Danilo18.pdf: 1530531 bytes, checksum: 1a9072d60b1aee7abd7f4a51ea079af4 (MD5) / Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-07-18T20:35:09Z (GMT) No. of bitstreams: 1 sandre_dg_me_araca.pdf: 1530531 bytes, checksum: 1a9072d60b1aee7abd7f4a51ea079af4 (MD5) / Made available in DSpace on 2016-07-18T20:35:09Z (GMT). No. of bitstreams: 1 sandre_dg_me_araca.pdf: 1530531 bytes, checksum: 1a9072d60b1aee7abd7f4a51ea079af4 (MD5) Previous issue date: 2016-06-03 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Dois experimentos envolvendo 1280 pintos machos Cobb 500, foram conduzidos para avaliar as possíveis interações entre condicionamento termo precoce e balanço eletrolítico da dieta sobre o desempenho de frangos de corte, bem como estudar os efeitos do estresse térmico agudo e crônico. No d 8, as aves foram transferidas para 32 boxes, com raspas de madeira e resíduo desidratado de acerola (proporção ½ a ½ ) como cama, mantendo os mesmos tratamentos com oito repetições cada. Os dados da Exp. 1 (stress agudo) e 2 (stress crónico) foram combinados num arranjo fatorial 2x2x2 (com e sem condicionamento térmico precoce (CTP); dieta com e sem equilíbrio eletrolítico (EE); e estresse térmico agudo ou crônico. A dieta com EE foi calculada como mEq / kg para a Na + K-Cl e o valor da relação (K + Cl) / Na, com 300 mEq / kg e uma proporção de 3: 1, respectivamente. As aves foram alimentadas com: (1) uma dieta tradicional (176 mEq / kg e a relação de 3,36: 1) sem CTP; (2) dieta tradicional com CTP; (3) dieta com EE e sem CTP e (4) dieta com EE e CTP. Ração e água foram fornecidas ad libitum. Metade das aves foram expostas a 36 °C durante 24 horas com a idade de 5, enquanto que a outra metade não foi exposto a CTP. Na idade de 38 d, metade dos pintos foram termicamente desafiados por estresse térmico agudo de 36 °C durante 6h e com a idade de 35 a 39 d, outra metade dos pintos foram termicamente desafiado por um estresse térmico crônico de 32 °C por 6h. O consumo de ração, peso corporal (PC), a umidade das fezes e deposição de gordura abdominal foram determinadas a 46 d de idade e taxa de conversão alimentar ajustado foi calculado através da inclusão de PC da mortalidade. Coordenadas tricromáticas (L*, a*, e b*) foram medidos no músculo do peito, às 24h. Nenhum efeito de interação foi encontrado com nenhum dos parâmetros avaliados. Assim, não existe sinergismo para qualquer um dos traços. Houve aumento expressivo da mortalidade [(3,06-65,62%) / P <0,0001] de estresse agudo. O EE aumentou a umidade nas fezes (P = 0,0202). Os conteúdos de lipídios dos tecidos abdominais foram afetados pela exposição ao calor e diminuiu significativamente (P <0,0001) para crônica (53.9g) versus estresse agudo (127.5g). Além disso, um efeito significativo (P <0,0001) valores mais elevados foi encontrado em carne para aguda (66,4 e 23,2) versus o estresse crônico (57,6 e 17,6), em L* e b*, respectivamente. Os resultados sugerem que as aves submetidas a estresse agudo estão sujeitos a síndrome do músculo pálida aves. / Two experiments involving 1280 male Cobb 500 chicks were conducted to evaluate the possible interactions between early thermal conditioning and electrolyte balance of the diet on the performance of broiler chickens, as well as studying the effects of acute and chronic heat stress. On d 8, the broilers were transferred to 32 floor pens with wood shavings as litter while maintaining the same treatments with eight replicates each. The data from Exp. 1 (acute stress) and 2 (chronic stress) were combined in a 2x2x2 factorial arrangement [with and without early thermal conditioning (ETC)]; diet with and without electrolyte balance (EB); and acute or chronic heat stress. The diet with EB was calculated as mEq/kg for Na+K-Cl and the value the ratio (K+Cl)/Na, with 300 mEq/kg and a ratio the 3:1, respectively. The birds were fed: (1) a traditional diet (176 mEq/kg and a ratio the 3.36:1) without ETC; (2) traditional diet with ETC; (3) diet with EB and without ETC and (4) diet with EB and ETC. Feed and water were supplied ad libitum. Half of birds were exposed to 36°C for 24h at the age of 5, whereas the remaining half was not exposed to ETC. At the age of 38 d, half chicks were thermally challenged by an acute heat stress of 36°C for 6h or at the age of 35 to 39 d, another half chicks were thermally challenged by a chronic heat stress of 32°C for 6h. Feed intake, body weight (BW), moisture of feces and abdominal fat deposition were determined at 46 d of age and adjusted feed conversion ratio was calculated by including BW of mortality. Trichromatic coordinates (L*, a*, and b*) were measured on the breast muscle at 24h. No interaction effects were found for any of the parameters evaluated. Thus, there is no synergism for any of the traits. There was expressive increase of mortality [(3.06 to 65.62%) / P<0.0001] from acute stress. The EB increased moisture of feces (P=0.0202). Lipid contents of abdominal tissues was affected by heat exposure with significantly decreased (P<0.0001) to chronic (53.9g) versus acute stress (127.5g). Also, a significant effect (P<0.0001) values higher was found in meat for acute (66.4 and 23.2) versus chronic stress (57.6 and 17.6) on L* and b*, respectively. The results suggest that birds submitted to acute stress are subject to pale poultry muscle syndrome.

Orientador: Guilherme de Paula Nogueira / Cooientador: Garcia Neto, Manoel / Banca: Marcelo Vasconcelos Meireles / Banca: Antonio Celso Pezzato / Resumo: Dois experimentos envolvendo 1280 pintos machos Cobb 500, foram conduzidos para avaliar as possíveis interações entre condicionamento termo precoce e balanço eletrolítico da dieta sobre o desempenho de frangos de corte, bem como estudar os efeitos do estresse térmico agudo e crônico. No d 8, as aves foram transferidas para 32 boxes, com raspas de madeira e resíduo desidratado de acerola (proporção ½ a ½ ) como cama, mantendo os mesmos tratamentos com oito repetições cada. Os dados da Exp. 1 (stress agudo) e 2 (stress crónico) foram combinados num arranjo fatorial 2x2x2 (com e sem condicionamento térmico precoce (CTP); dieta com e sem equilíbrio eletrolítico (EE); e estresse térmico agudo ou crônico. A dieta com EE foi calculada como mEq / kg para a Na + K-Cl e o valor da relação (K + Cl) / Na, com 300 mEq / kg e uma proporção de 3: 1, respectivamente. As aves foram alimentadas com: (1) uma dieta tradicional (176 mEq / kg e a relação de 3,36: 1) sem CTP; (2) dieta tradicional com CTP; (3) dieta com EE e sem CTP e (4) dieta com EE e CTP. Ração e água foram fornecidas ad libitum. Metade das aves foram expostas a 36 °C durante 24 horas com a idade de 5, enquanto que a outra metade não foi exposto a CTP. Na idade de 38 d, metade dos pintos foram termicamente desafiados por estresse térmico agudo de 36 °C durante 6h e com a idade de 35 a 39 d, outra metade dos pintos foram termicamente desafiado por um estresse térmico crônico de 32 °C por 6h. O consumo de ração, peso corporal (PC)... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Two experiments involving 1280 male Cobb 500 chicks were conducted to evaluate the possible interactions between early thermal conditioning and electrolyte balance of the diet on the performance of broiler chickens, as well as studying the effects of acute and chronic heat stress. On d 8, the broilers were transferred to 32 floor pens with wood shavings as litter while maintaining the same treatments with eight replicates each. The data from Exp. 1 (acute stress) and 2 (chronic stress) were combined in a 2x2x2 factorial arrangement [with and without early thermal conditioning (ETC)]; diet with and without electrolyte balance (EB); and acute or chronic heat stress. The diet with EB was calculated as mEq/kg for Na+K-Cl and the value the ratio (K+Cl)/Na, with 300 mEq/kg and a ratio the 3:1, respectively. The birds were fed: (1) a traditional diet (176 mEq/kg and a ratio the 3.36:1) without ETC; (2) traditional diet with ETC; (3) diet with EB and without ETC and (4) diet with EB and ETC. Feed and water were supplied ad libitum. Half of birds were exposed to 36°C for 24h at the age of 5, whereas the remaining half was not exposed to ETC. At the age of 38 d, half chicks were thermally challenged by an acute heat stress of 36°C for 6h or at the age of 35 to 39 d, another half chicks were thermally challenged by a chronic heat stress of 32°C for 6h. Feed intake, body weight (BW), moisture of feces and abdominal fat deposition were determined at 46 d of age and adjusted feed conversio... (Complete abstract click electronic access below) / Mestre