Different true-protein sources do not modify the metabolism of crossbred Bos taurus x Bos indicus growing heifers
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Data
2015-02-01
Autores
Mota, Diego Azevedo
Messana, Juliana Duarte
Canesin, Roberta Carrilho
Fiorentini, Giovani
Pires, Alexandre Vaz
Berchielli, Telma Teresinha [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Revista Brasileira Zootecnia Brazilian Journal Animal Sci
Resumo
The present study was conducted to investigate the effect of alternative true-protein sources to soybean meal, with different ruminal degradability, using a sugarcane-based diet, on nutrient digestion, ruminal fermentation, efficiency of microbial protein synthesis and passage rate in prepubertal dairy heifers. Eight crossbred rumen-and duodenum-cannulated Holstein x Gyr dairy heifers (202.0 +/- 11.5 kg BW) were evaluated in a 4 x 4 Latin square experimental design with four treatments and four periods in two simultaneous replicates. Dietary treatments were: soybean meal; cottonseed meal; peanut meal; and sunflower meal. When associated with diets containing sugarcane, the different protein sources did not affect intake or digestibility of dry mater, crude protein, organic matter and neutral detergent fiber. The average ruminal pH, NH3-N and concentration of total volatile fatty acids were not different among the diets supplied. The concentration of butyric acid was different among the protein sources, wherein the animals fed the diet with sunflower meal presented lower values than those fed the other sources. Diets did not affect nitrogen balance, microbial nitrogen, microbial synthesis efficiency, estimated dry matter flow, or passage rate. Alternative protein sources can be used to reduce the costs without changing the animal metabolism.
Descrição
Palavras-chave
Microbial synthesis, Nitrogen balance, Rumen degradable protein, Sugarcane
Como citar
Revista Brasileira De Zootecnia-brazilian Journal Of Animal Science. Vicosa-mg: Revista Brasileira Zootecnia Brazilian Journal Animal Sci, v. 44, n. 2, p. 52-59, 2015.