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Patterns of carcass fat deposition in heifers steers and bulls



Patterns of carcass fat deposition in heifers steers and bulls



Canadian Journal of Animal Science 59(2): 359-366



Young, full-fed, Shorthorn-sired cattle (36 heifers, 24 steers, 15 bulls) were slaughtered over a wide live weight range (150-550 kg) to evaluate the influence of sex on the patterns of fat deposition. Growth coefficients for depot fat relative to half-carcass fat were homogeneous and there were no differences (P > 0.05) among the adjusted means of depot fat at constant total fat. Depot fat partitioning among sexes is probably minor, provided comparisons are made at equal fatness. Total rate of fat deposition relative to muscle was similar for heifers and steers but significantly (P < 0.01) lower for bulls. Differences in fattening patterns among sexes apparently result from a combination of fattening at a lighter wt of carcass muscle in heifers than steers and steers than bulls, and from a more rapid rate of fat deposition relative to muscle in heifers and steers than bulls. Relative to half-carcass fat, the rate of fat deposition was greatest in the s.c. depot in both sexes followed by intermuscular fat and body cavity fat. Relative growth of kidney fat was variable among the sexes but it was generally similar to the s.c. depot. Relative rate of intermuscular fat deposition was greater in the forequarter than the hindquarter while relative rate of s.c. fat deposition was similar in the fore- and hindquarters.

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Accession: 006074740

Download citation: RISBibTeXText

DOI: 10.4141/cjas79-044



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