J. Anim Sci.
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J. Anim Sci. 1983. 56:380-395.
© 1983 American Society of Animal Science
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Effects of Breed and Intake Level on Allometric Growth Patterns in Ram Lambs

D. R. Notter1,2,, C. L. Ferrell1 and R. A. Field3

US Department of Agriculture, Clay Center, NE 68933 and and University of Wyoming, Laramie 82070

Abstract

Effects of breed and intake level on growth of body components (Y) in relation to the whole body (W) were evaluated with the allometric equation, Y=aWb, for 52 Rambouillet, 46 Dorset and 53 Finnish Landrace (Finn) ram lambs fed to 100,85 or 70% of ad libitum or a maintenance (50% of ad libitum). For rams fed ad libitum, the allometric growth coefficient indicated that as the rams grew, weights of carcass, fleece and fatty tissues increased relatively more rapidly than did body weight (b>1) and that weights of vital organs and nonfat components increased relatively less rapidly than did body weight (b<1>. Relative growth rates increased with body weight for fat-free components. Yield of trimmed cuts varied curvilinearly with body weight and was maximized at body weights of 40.7 kg for Rambouillets, 40.5 kg for Dorsets and 34.7 kg for Finns. Dorsets had higher yields of carcass and trimmed cuts than did Finns and Rambouillets. Finns had a greater propensity to deposit internal fat than did Dorsets and Rambouillets. In growing rams, effects of intake level on body composition were small, although limit-fed rams had more weight in hot carcass and trimmed cuts than rams fed ad libitum to the same weight. However, rams fed at maintenance for 105 were fatter, had less body moisture and had greater yield of trimmed cuts than did rams fed ad libitum to the same weight.

Footnotes

1 Roman L. Hruska US Meat Animal Research Center, AR-SEA, USDA.

2 Present address: Dept. of Anim. Sci., Virginia Polytechnic Institute and State Univ., Blacksburg 24061.

3 Division of Anim. Sci., Univ. of Wyoming.






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Copyright © 1983 by the American Society of Animal Science.