The Predicted Equation in Live-Weight of Crossbred Swine (Large White x Landrace x Duroc Jersey)

Abstract

The purpose of this study was to obtain the predicted equation in live-weight of crossbred swine (Large White x Landrace x Duroc Jersey) from various body parameters and age. The live-weight values computed by using predicted equation and those by commercial tape measure were compared. The heart girth, body length, age and weight of a total of 450 Large White x Landrace x Duroc Jersey crossbred swine aged between 10-26 weeks were studied the relationship of those factors and their live-weight by using linear regression. The results revealed that every factor is highly related (P<0.01) to the live-weight. The predicted equation is as follows : W = 1.09G+0.23L+ 2.03A-80.86;  when W, G, L and A are live-weight (kg), heart girth (cm), body length (cm) and age (week), respectively. R²= 0.97 is specific coefficient. The predicted equation is : W = 1.90G-100.89; R² = 0.96, when only heart girth is used for live-weight predicted equation. The results show that live-weight derived from the predicted equation is obviously different from that the commercial weight band, except the weights are from the heart girth between 70-75 cm.