Substittuição do farelo de soja por farelos oriundos da produção de biodiesel na dieta de vacas leiteiras sob pastejo

• Autor(a) principal: Alves Júnior, Renato Tonhá
• Data de Publicação: 2019
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/16993
• topic: Co-produto; Proteina; Capim; Digestibilidade; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA

The objective of this research was to evaluate the effects of the use of different biodiesel co-products in the concentrate of lactating cows under Tanzania grass grazing, on dry matter and nutrient intake and digestibility, body score condition, live weight variation, balance. energy, purine derivatives, nitrogen balance, ruminal parameters (pH, short-chain fatty acids (AGCC), ammonia nitrogen (N-NH3) and microbial protein), milk yield and composition. Sixteen crossbred Holstein x Gir cows, twelve lactating, with an average milk production of 21.14 kg / day and four non-lactating and rumen cannulated (for the evaluation of pH, N-NH3, AGCC and microbial protein variables). distributed in a triple 4x4 latin square. Each experimental period lasted 21 days, with 14 days for adaptation and seven days for collection; totaling 84 days of experiment. The animals remained in intermittent grazing Tanzania grass and were milked twice a day, receiving concentrated feed after each milking in individual stalls. There were four treatments varying the protein source of the diet, being used byproducts from biodiesel industries: soybean meal, sunflower meal, cottonseed meal and peanut meal. For lactating cows there was no difference between treatments in relation to the intake of DM, CP, NDF, CNF and CHT. TDN intake increased (P <0.05) for treatment with cottonseed meal. There was also no difference in nutrient digestibility except for NDF and CHT. All animals showed no difference in weight, ECC and weight and ECC variation in relation to treatments. Also no difference was found for the variables pertaining to milk production and composition. However, the cottonseed byproduct presented higher ELc, lower negative BE and EUELL. Microbial protein production and nitrogen balance showed no difference between the use of different coproducts. For rumen and cannulated dry cows There was no difference (P> 0.05) between co-products in relation to DM, CP, EE, NDF, CNF, CHT and NDT intake. There was also no difference in nutrient digestibility. except for NDF and CHT. All animals showed no difference in relation to ruminal parameters, but there was alteration in N-NH3 levels indicating that the soybean meal co-product had lower production and the peanut meal co-product showed higher production compared to the others. coproducts. There was no influence of co-products on N consumption and excretion. No difference was observed in the excretion of purine derivatives and microbial protein production. Thus, the use of cottonseed meal was better among the other brans replacing soybean meal in the diet of grazing lactating cows, providing better energy balance for the animals. For dry cows, the cottonseed meal was also better than the other brans, providing greater efficiency in relation to the digestibility of total carbohydrates and neutral detergent fiber in the diet.