Prediction of paired testicular weight in Holstein Friesian X Sahiwal crossbred bulls

The objective of the study was to develop suitable estimation procedure of testicular weight in Holstein Friesian x Sahiwal crossbred bulls. The best predictive regression model for predicting paired testicular weight (PTW) was Y_ptw= 12.13*SC+27.22*AvTL-177.57 (R² =0.58); right testicular weight (Y_rtw) was Y_rtw= 12.41*RL+26.90*RW-41.03 (R² =0.56) and that of left testicular weight (Y_ltw) was Y_ltw = 20.62*LL+24.78 (R² =0.56), where SC= scrotal circumference, AvTL= average testicular length, RL= right testicular length, RW= right testicular width and LL= left testicular length, respectively. Predictive efficacy of present equations was compared with other available methods/models and proved better. The average error and average absolute error for prediction of paired testicular weight was 9.49% and 10.68%, respectively. The correlation coefficient between the estimated and actual (observed) testicular weight was 0.87 (P<0.05). It was concluded that above equations are effective for predicting testicular weight in Holstein Friesian x Sahiwal crossbred bulls.