Intake and total digestibility of nutrients and milk production and composition in dairy cows fed with increasing crude protein levels in the diet with sugar cane and concentrates

Revista Brasileira de Zootecnia

Aguiar, Luzyanne Varjão¹  Pereira, Mara Lúcia Albuquerque²  Cordeiro, Carla Fabrícia de Araujo¹  Figueiredo, Mauro Pereira de²  Almeida, Paulo José Presidio¹  Mendonça, Sandro de Souza³ 

[1] UESB;UNESP, Jaboticabal

关键词: cottonseed meal;    early lactation;    rumen undegradable protein    Introdução No início da lactação;    as exigências nutricionais podem não ser completamente supridas;    em razão da quantidade de leite produzida;    pois ocorre redução na taxa de ingestão;    resultando em balanço energético negativo;    que limita a capacidade de suprimento das demandas energéticas;    uma vez que;    em níveis de produção mais elevados;    a vaca mobiliza suas reservas corporais para mantença e produção;   

DOI  :  10.1590/S1516-35982007000900023

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this research was to evaluate the effect of increasing levels of CP in the total DM of diet (11.5, 13.0, 14.5 and 16.0%) on the intakes and the total digestibility of nutrients and the milk production and composition of dairy cows in initial third of lactation. The research was constituted by four experimental periods of 15 days each, seven for adaptation of the animals to the diet and eight for data collection. Eight cows, individually fed, were distributed to two balanced 4 × 4 Latin squares. A cottonseed meal, ground corn-based concentrate (40%) was used and, as forage, sugar cane corrected with 1% of urea + ammonium sulfate (9:1), in the proportion of 60% (%DM). The daily average intakes of nutrients, except for EE and NFC, differed as the levels of CP increased in the diet. The protein levels in the diet did not affected the coefficients of total apparent digestibility of the nutrients. Production of fat corrected milk, 3.5% or not and its components (fat, CP and lactose), expressed in g/day, and milk urea nitrogen showed increased linear effect, while the N efficiency showed negative linear effect of the CP levels in the diet. The diet with 16% CP provided values numerically greater for intake and milk production and its components as compared to diets with lower levels of CP.

【 授权许可】

CC BY-NC