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Protein metabolism, body composition and meat quality of Nellore cattle (Bos indicus) as a function of their residual feed intake

Grant number: 05/04235-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2006
Effective date (End): March 31, 2009
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Production
Principal researcher:Paulo Roberto Leme
Grantee:Rodrigo da Costa Gomes
Home Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

Since knowledge about biological basis, which drive variation in zebuins residual feed intake (RFI), is not complete, studies are need to evaluate consequences of selection for this parameter in meat quality traits. Our hypothesis is that more efficient animals have lower mantenance energy requeriments since they have lower muscle protein degradation rates as function of higher calpain inhibitors enzimatic activity. So, selection for RFI could have negative effects on meat tenderness. Animals selection for RFI will be done at FZEA/USP, in Pirassununga, SP. Fourty-two Nellore steers will be fed in individuals pens for a 84-day period. Predict dry matter intake will be estimated by multiple regression on mid-test metabolic live weight and average daily gain. Twelve of those more efficient animals and twelve of those less efficient will be carried to Veterinary School of UFMG, in Belo Horizonte, MG, where animals mantenance energy requeriments will be determined by indirect calorimetry. Total urine produced will be collected and concentration of the amino acid 3-methil-histidin (miofibrilar degration rate marker)will be determined. Then, animals will return to FZEA/USP, where will be killed and Longissimus dorsi muscle samples will be collected to measure activity of calpain-system components and meat tenderness for objective measures.

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
GOMES, Rodrigo da Costa. Protein metabolism, body chemical composition, carcass traits and meat quality of Nellore steers (Bos indicus) as a function of their residual feed intake. 2009. Doctoral Thesis - Universidade de São Paulo (USP). Faculdade de Zootecnica e Engenharia de Alimentos (FZE/BT) Pirassununga.

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