J. Anim Sci.
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Journal of Animal Science, Vol 76, Issue 3 665-673, Copyright © 1998 by American Society of Animal Science

JOURNAL ARTICLE

Adipose tissue partitioning of limit-fed beef cattle and beef cattle with ad libitum access to feed differing in adaptation to heat

J. E. Sprinkle, C. L. Ferrell, J. W. Holloway, B. G. Warrington, L. W. Greene, G. Wu and J. W. Stuth
Texas Agricultural Experiment Station, Uvalde 78801, USA.

We compared fat distribution and lipoprotein lipase (LPL) activity in steers differing in adaptability to the subtropics. Steers were fed a grain diet (3.13 Mcal ME/kg DM) at limited (150 kcal ME x kg[-.75] x d[-1]; .23 kg ADG) or ad libitum levels for 140 d, then slaughtered. Sixteen British- (8 Angus, 8 Hereford; S), 16 Boran- (R), 16 Brahman- (B), and 16 Tuli- (T) cross steers from MARC III composite cows were used. Adipose tissue samples from perirenal, omental, and subcutaneous depots were analyzed for LPL activity. Carcass measurements including omental, external, and seam fat trim from 1/ 2 of the carcass were measured. Subcutaneous fat had greater (P < .05) LPL activity than fat from the other depots. Generally, there were no differences (P > .05) in fat distribution for steers fed at limited levels. Means for ADG, slaughter weights, carcass weights, yield grades, and carcass lipid weights for S and B fed for ad libitum intake were greater (P < .05) than those for T and R. Marbling was greatest (P < .05) for S and did not differ (P > .05) for the other breeds with ad libitum intake. Factor analysis of fat depots for animals with ad libitum intake indicated that Bos taurus cattle differing in adaptation to heat deposited fat differently; S deposited greater (P < .05) proportions of carcass fat and T deposited greater (P < .05) proportions of internal fat. It seems that accumulation of internal fat is detrimental for ADG for Bos taurus cattle.


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M. J. McPhee, J. W. Oltjen, T. R. Famula, and R. D. Sainz
Meta-analysis of factors affecting carcass characteristics of feedlot steers
J Anim Sci, November 1, 2006; 84(11): 3143 - 3154.
[Abstract] [Full Text] [PDF]


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Copyright © 1998 by the American Society of Animal Science.