Teores de caroço de algodão em dietas contendo silagem de milho para vacas em lactação
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Data
2002
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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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Ácidos graxos, Degradabilidade, Digestibilidade, pH, Volatile fatty acids, Degradability, Digestibility
Citação
FERNANDES, Juliano José de Resende; PIRES, Alexandre Vaz; SANTOS, Flávio Augusto Portela; SUSIN, Ivanete; SIMAS, José Manuel Correia de. Teores de caroço de algodão em dietas contendo silagem de milho para vacas em lactação. Acta Scientiarum. Animal Sciences, Maringá, v. 24, n. 4, p. 1071-1077, 2002.