Microbial protein synthesis and urea nitrogen concentrations in lactating dairy cows fed spineless cactus and different forages based diets

Revista Brasileira de Zootecnia

Melo, Airon Aparecido Silva de²  Ferreira, Marcelo de Andrade²  Ramos, Alenice Ozino¹  Guimarães, Amanda Vasconcelos¹  Silva, Renata Rodrigues da¹  Véras, Antonia Sherlânea Chaves² 

[1] UFRPE

关键词: creatinine;    purine derivatives;    semi-arid;    spot sample    Introdução A palma forrageira tem sido utilizada como base na alimentação do rebanho em importantes bacias leiteiras do Nordeste;    por ser uma cultura adaptada às condições edafoclimáticas locais e excelente fonte de energia;    rica em carboidratos não-fibrosos;   

DOI  :  10.1590/S1516-35982009000100020

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

Five Holstein cows were allotted to a 5 × 5 Latin square design with the objective of evaluating the microbial protein production, using the total excretion of purine derivatives (PD), obtained from spot urine collection, plasma and milk urea and nitrogen (N)-urea. The five treatments contained different forage sources: sugar cane bagasse (CB), tifton hay (TH), elephant grass hay (EH), sorghum silage (SS) and a mixture of sugar cane bagasse + sorghum silage (CBSS). The milk urea (10.98 mg/dL) and N-urea (5.11 mg/dL) concentrations were not influenced by the forage sources, such as plasma urea (28.10 mg/dL) and N-urea (13.09 mg/dL) concentrations. The urinary urea, N-urea, allantoin and PD excretions, the absorbed purine, N-microbial synthesis and milk allantoin concentration remained unchanged. The different forage sources in association with forage cactus did not change the microbial protein production.

【 授权许可】

CC BY-NC