Levels of cottonseed in diets containing corn silage for lactating cows
Five canulated (rumen and proximal duodenum) mature Holstein cows, averaging 200 days in milk, were used in a 5x5 Latin square design to evaluate: dry matter intake, nutrient digestibility and ruminal parameters of diets containing cottonseed. The treatments were T0, T6, T12, T18 e T24 corresponding...
| Autores: | , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | Brasil |
| Recursos: | Universidade Estadual de Maringá (UEM) |
| Repositorio: | Acta Scientiarum. Animal Sciences (Online) |
| Idioma: | portugués |
| OAI Identifier: | oai:periodicos.uem.br/ojs:article/2528 |
| Acesso em linha: | https://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/2528 |
| Access Level: | acceso abierto |
| Palavra-chave: | ácidos graxos degradabilidade digestibilidade pH 5.04.00.00-2 Zootecnia |
| Resumo: | Five canulated (rumen and proximal duodenum) mature Holstein cows, averaging 200 days in milk, were used in a 5x5 Latin square design to evaluate: dry matter intake, nutrient digestibility and ruminal parameters of diets containing cottonseed. The treatments were T0, T6, T12, T18 e T24 corresponding to 0%, 6%, 12%, 18%, 24% of cottonseed in the diet (Dry Matter basis). The cows were fed 40% concentrate and 60% corn silage. Milk production (kg/day) and milk protein (g/day) had a quadratic response while fat corrected milk production had a quadratic tendency. There was a tendency to reduce dry matter and organic matter intake. Dry matter apparent digestibility was reduced (P < 0.05) linearly. Ether extract apparent digestibility was increased (P < 0.05) linearly. Apparent digestibility of crude protein, neutral detergent fiber and crude energy were not altered. Acid detergent fiber apparent digestibility was reduced (P < 0.05) linearly. Ruminal pH and total volatile fatty acids did not differ among treatments. Acetate and propionate concentration and acetate propionate ratio had a quadratic response while butyrate was reduced (P < 0.05) linearly. The effective degradability of dry matter in the passage rates of 2%, 5% and 8%/h, as well as soluble fraction and insoluble in water were not changed, although the degradability of insoluble fraction decreased linearly and the potential degradability increased linearly. |
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