Efficiency of feed energy utilization for protein and fat gain in Hereford and Charolais steers

Two multiple regression models were used to estimate energetic efficiency of protein and fat gain for 84 grade British steers, predominantly Hereford, and 84 Charolais steers using data obtained from a comparative slaughter feeding trial. In Model One, metabolizable energy intake was regressed on en...

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Bibliographic Details
Published inJournal of animal science Vol. 60; no. 3; p. 766
Main Authors Old, C A, Garrett, W N
Format Journal Article
LanguageEnglish
Published United States 01.03.1985
Subjects
Animal Feed
Animals
Body Composition
Body Weight
Cattle - genetics
Cattle - metabolism
Dietary Proteins
Energy Metabolism
Lipid Metabolism
Male
Proteins - metabolism
Regression Analysis
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Summary:Two multiple regression models were used to estimate energetic efficiency of protein and fat gain for 84 grade British steers, predominantly Hereford, and 84 Charolais steers using data obtained from a comparative slaughter feeding trial. In Model One, metabolizable energy intake was regressed on energy gain as fat and protein; the intercept was an estimate of maintenance. For Model Two, maintenance requirements were estimated by regression of log heat production (kcal/kg.75) on metabolizable energy intake (kcal/kg.75) and iterating to the point at which heat production was equal to metabolizable energy intake. Energy intake above maintenance was then regressed on energy gained as fat and protein. Results from Model One showed the efficiencies of protein and fat gain to be 10 and 49%, while Model Two indicated these efficiencies were 11 and 58%. Breeds did not appear to differ significantly in the efficiency with which they used metabolizable energy for protein or fat deposition.
ISSN:0021-8812
DOI:10.2527/jas1985.603766x