In late finishing, increasing the Lys-to-calorie ratio improved (quadratic, P < 0.02) ADG, G F, IOMFC and lean percentage.
Addition of 10 mg dbcAMP/kg to the diet was beneficial for growth performance and lean percentage, as well as improving protein and fat metabolism.
However, a linear effect (P < 0.01) was observed for hot carcass yield and a trend toward a quadratic effect (P < 0.10) for hot carcass weight, backfat thickness and lean percentage.
Results showed that dietary supplementation with 1.5% powder increased ADG and lean percentage, improved the gain:feed ratio, and lowered the incidence of diarrhea in Tibetan pigs (P < 0.05), compared with the control group.
Lean percentage was greater (P < 0.05) and longissimus muscle area tended to increase (P = 0.10) in pigs fed 10 mg dbcAMP/kg when compared to the control group, but hot carcass weight was not affected by dbcAMP.
Relative total body Lean: lean percentage of total body weight.
Their excellent performance, including fast growth and a high lean percentage, has led them to dominate the global pig industry.
In general, Chinese native pigs have average daily gains of ~400 g/d and a lean percentage of less than 45%, which are very different from the average daily gain of more than 800 g/d and a lean percentage greater than 60% in Western commercial pigs [ 2].
Dunshea et al. (2007) found higher prediction accuracies for chemically determined reference carcass composition in sheep with R² of 0.98 for lean weight and of 0.94 for lean percentage.
The first principal component grouped several fatness (fat thickness) measures and serum cholesterol values, together with intramuscular fat, saturated and monounsaturated fatty acids content in gluteus medius, while lean percentage and gluteus medius polyunsaturated fatty acids content were closely located at the other extreme of the axis.
