Discipline: Veterinary Medicine
A total of 94 (34 males and 60 females) apparently healthy locally raised purebred Brahman cattle (2-9 years old) were weighed and different external body measurements such as heart girth, midriff girth, flank girth, height, width of shoulder, width of hip , body length 1 (the distance from the base of the tail to the point before the hump) and body length 2 (the distance from the shoulder to the hind leg which is perpendicular to base of the tail) were obtained primarily to establish formulas for weight determination using body measurements. Correlation analysis revealed that a strong linear relationship exists between body weight and the different external body measurements. Heart girth was found to be the best single predictor of weight regardless of sex as shown by stepwise regression analysis. In using two parameters in estimating weight, heart girth and width of shoulder appeared to be the most accurate external parameters. A dummy regression analysis was also carried out and results showed that there was marked sexual dimorphism which favored the male. Actual weights were then compared to predicted weights using the new developed formulas. Results of the paired t-test revealed that there were no significant differences between actual and predicted weights, which suggest that all of the equations could be used in predicting weight even though marked sexual dimorphism was observed using the formulas based on heart girth (R2 = 0.943) and combination of heart girth and width of shoulder (R2 = 0.953), the bodyweight of locally-raised adult purebred Brahman cattle could be estimated. These formulas could be used to estimate the bodyweight of Brahman cattle in farms or areas without accurate weighing facilities.