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soares_jpg_dr_jabo.pdf: 336350 bytes, checksum: b7c430f6a886cefb0db991d9ccbc1c6e (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / O Consumo de matéria seca (CMS), de fibra em detergente neutro (CFDN), o enchimento físico ruminal, as taxas de passagem no rúmen e pós-rúmen e o efeito da suplementação com concentrado sobre o consumo de MS da forragem foram avaliados com o objetivo de identificar os fatores limitantes do consumo de vacas leiteiras, em confinamento, que receberam capim-elefante picado e cortado com 30, 45 e 60 dias de crescimento. O CMS (8,0 kg/vaca/dia) e CFDN (5,3 kg/vaca/dia) obtidos com o capim cortado com 30 dias, foram inferiores (P<0,05) àqueles obtidos com 45 dias (10,0 e 6,6 kg/vaca/dia) e 60 dias (11,0 e 7,3 kg/vaca/dia), respectivamente. O CMS dos tratamentos com 30 e 45 dias foram semelhantes (P>0,05). O conteúdo máximo ruminal de FDN ocorreu às 4h22 (7,40 kg), 3h55 (7,60 kg) e 3h49 (7,57 kg) após o oferecimento do capim cortado com 30, 45 e 60 dias de idade, respectivamente. A taxa de passagem das partículas de FDN, com o tamanho de 2,38 mm do capim-elefante suplementado com 4 kg (3,7%/h), foi superior (P<0,05) ao capim sem suplementação (3,1%/h). O capim suplementado com 2 kg (3,4%/h) foi semelhante (P>0,05) aos outros dois tratamentos. Ocorreu efeito associativo combinado entre o CMS do capim e do suplemento. O enchimento físico do rúmen não limitou o consumo FDN, entretanto o teor de umidade do capim afetou o enchimento físico, limitando o consumo de MS do capim-elefante. / Dry matter intake (DMI), neutral detergent fiber intake (NDFI), rumen fill, NDF rumen and post-rumen rates of passages and the effect of the concentrate supplementation on forage DMI were evaluated to determine the limiting factors intake of crossbred dairy cows managed in a free stall system fed chopped elephantgrass harvested at 30, 45 and 60 days of growth. The average DMI (8.0 kg/cow/day) and NDFI (5.3 kg/cow/day) values were lower (P<.05) for the 30 days elephantgrass than those for the 45 days (10.0 and 6.6 kg/cow/day) and 60 days (11.0 and 7.3 kg/cow/day) for the DMI and NDFI, respectively. The average DMI of the 45 and 60 days treatments were similar (P>.05). The maximum NDF rumen fill content was observed at 4h22 (7.40 kg), 3h55 (7.60 kg) and 3h49 (7.57 kg) after feeding for the treatments with 30, 45 and 60 days of growth, respectively. NDF rumen passage rate for particles sizes with 2.38 mm of elephantgrass supplemented with 4 kg (3.7%/h) was higher (P<.05) to 2 kg (3.1%/h). There was no treatment effect (P>.05) in the NDF rumen passage rate without concentrate supplementation (3.4%/h) and the two supplemented treatments. A combined associative effect on the DMI was observed on the two levels of concentrate. There was no treatments effect (P>.05) in the rumen fill for the NDF intake of cows, probably due to the low dry matter content of the forage.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/104966 |
| Date | 01 July 2002 |
| Creators | Soares, João Paulo Guimarães [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Berchielli, Telma Teresinha [UNESP], Aroeira, Luiz Junuário Magalhães [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | xi, 110 f. |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1, -1 |
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