Rate, Composition and Efficiency of Growth in Lean and Obese Pigs

TL;DRAbstract

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. Th

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