The Study on the Effect of Natural Plant Feed Additive on the Growth Performance and Carcass Quality of Hybrid Porcine

Total hundred of piglets of each twenty from the five hybrid pigs of Duroc × N3(YN3),Duroc × N2(YN2),Duroc × N1(YN1),Yorkshire × Landrace×Saba(YLS) and Duroc×Landrace× White large(DLW) weighting 20 kg were fed ad libitum the same feed with a supplement of a dried extract of a mixture of 'medicinal herbs'(NPE) at the rate of 4 g supplement per kilogram of feed in feeding trial for 120 d to investigate the effect of genotypes on the growth performance and body composition.Average daily gain(ADG) and feed conversion efficiency(FCE) in DLW hybrid pigs were the highest among the hybrid pigs and it has been shown that crossbreed selection significantly increased growth performance and feed conversion efficiency in DLW hybrid pigs.The ADG and FCE were trend to high in DN1 even though there were no significant differences among the DN1,DN3 and DN2.The eye muscle area in DLW was the highest and the backfat thickness was the lowest among the hybrids and no significant differences were observed among the other hybrids.