J. Anim Sci.
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J. Anim Sci. 1978. 47:441-447.
© 1978 American Society of Animal Science
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Rate, Composition and Efficiency of Growth in Lean and Obese Pigs1

Paul J. Cote, Jr. and Paul J. Wangsness

The Pennsylvania State University, University Park 16802

Abstract

The rate, composition, and efficiency of growth were determined for lean (Yorkshire) and genetically obese (feral-Ossabaw) pigs by use of body balance methods. Eight lean and eight obese pigs were sacrificed at 3 days of age and another five lean and six obese pigs were fed ad libitum a substitute sow's milk to approximately 26 days of age, and then a starter ration fed until sacrifice at 8 weeks of age. Lean pigs consumed more total gross energy (GE) (76.6 vs 49.0 Meal, P<01) and gained more live weight (11.0 vs 7.0 kg, P<.05), than obese pigs. Feed/gain was the same for both pig types. Percent body fat was greater in obese pigs at 3 days (3.3 vs 2.2%, P<.05) and at 8 weeks (13.6 vs 7.7%, P<.01), but percent body protein was the same in both pig types at 3 days (16%) and at 8 weeks (17.5%). The greater live weight gain of the lean pig was due primarily to its greater protein gain (PG) (1.61 vs 1.08 kg, P<05). Total fat gain (FG) and energy gain (EG) were similar for both pig types. The similarity in EG between the large lean pig and smaller obese pig was attributed to the greater caloric value for dry matter gain in the obese pig (.86 vs .49 FG/PG, P<.01). Total EG/GE consumed was greater for obese pigs (.29 vs .22, P<.05) which indicated that obese pigs were more efficient in retaining gross dietary energy as body energy. However, compared to the domestic pig, the obese feral pig to 8 weeks of age was characterized more by a decreased capacity for growth of the fat free mass than by an increased capacity for total body fat deposition.

Footnotes

1 Authorized for publication on September 9, 1977 as Paper No. 5375 in the journal series of the Pennsylvania Agricultural Experiment Station.






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Copyright © 1978 by the American Society of Animal Science.