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Carcass Composition and Adipose Tissue Metabolism in Growing Sheep^1,2,

Texas A&M University, College Station 77843 and U.S. Meat Animal Research Center^,6, Clay Center, NE 68933

Abstract

Experiments were conducted to investigate biological variables that influence fat accretion in growing ram lambs. Carcass composition and adipose tissue development were measured in Columbia-sired ram lambs from 32.0 to 73.9 kg body weight. Five or six ram lambs were slaughtered every 2 mo, from 4 to 10 mo of age. The percentage of carcass fat-free dry matter decreased with age from 30.9 to 27.5% (P<.05), while the percentage of carcass fat increased from 17.7 to 33.4%. Similarly, offal fat-free dry matter decreased with age (from 24.5 to 21 5), and there was nearly a threefold increase in the percentage of offal fat (P<.05 for both measures). Subcutaneous adipocyte diameter and lipogenesis in vitro increased from 4 to 6 mo of age, and did not increase further with age. A bimodal distribution of adipocytes was apparent in the 4-mo-old lambs, but was not observed in any other age group. The presence of glucose in incubation media stimulated acetate incorporation into fatty acids in vitro in adipose tissue from 8- and 10-mo-old lambs. However, glucose did not affect the rate of lipogenesis from lactate. The data indicate early, rapid increases in carcass fat accretion, which corresponded to similar increases in lipogenesis and lipogenic enzyme activities.

¹ The authors gratefully ackowledge the technical assistance of D. Deiter, P. Ekeren and J. J. Jacobson.

² Technical article no. 22007, Texas Agric. Exp. Sta.

³ Meats and Muscle Biol. Sec., Dept. of Anim. Sci., Texas A&M Univ., College Station.

⁴ U.S. Meat Anim. Res. Center, Clay Center, NE.

⁵ Current address: RFD 2, Box 108, Hastings, NE 68901.

⁶ Mention of a trade name, proprietary product or vendor does not constitute a guarantee or warranty by the USDA and does not imply its approval to the exclusion of other products or vendors that may be suitable.

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