J. Anim Sci.
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J. Anim Sci. 1972. 35:556-560.
© 1972 American Society of Animal Science
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Nitrogen Metabolism at Three Stages of Development and its Relationship to Measurements of Carcass Composition in Fat and Lean Type Swine1

J. C. McConnell2, K. M. Barth and S. A. Griffin3

University of Tennessee, Knoxville 37916,4

Abstract

Six fat- and six lean-type barrows were visually selected and randomly allotted to a split-plot experiment at an average weight of 26 kilograms. Digestion and N-metabolism trials were conducted with these pigs at 31, 53 and 91 kg of body weight. Fat-type pigs digested significantly higher amounts of dry matter and crude protein than lean-type pigs, although differences were most apparent only at 31 kg of body weight. During the overall experiment, the leaner pigs retained significantly more N daily than fatter pigs. However, at 31 kg of body weight, both types of pigs retained similar amounts of N daily. In lean-type pigs, N-retention remained rather constant (17 g/day) from 31 to 53 kg of body weight, decreasing sometime thereafter to approximately 12 g of N retained daily at 91 kg of body weight. Fat-type pigs, however, retained progressively fewer g of N daily as body weight increased (N-retentions of approximately 17, 12 and 7 g/day at body weights of 31, 53 and 91 kg, respectively).

Correlation coefficients between daily N-retention during each trial and measurements of final carcass composition were reported. The amounts of protein and moisture in the carcass were most highly correlated to daily N-retention which had been measured in 53 kg pigs.

Footnotes

1 Published with the permission of the Dean of the University of Tennessee Agricultural Experiment Station.

2 Present address: Department of Animal Science, Clemson University, Clemson, South Carolina.

3 Present address: School of Agriculture, Tennessee Technological University, Cookeville, Tennessee.

4 Department of Animal Science.






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Copyright © 1972 by the American Society of Animal Science.