The prediction of proximate body composition from shrunk empty body weight of pigs
1984
Anugwa, F.O.O. | Chase, L.W. (Cornell Univ., Ithaca, New York (USA))
62 Yorkshire pigs (5-104 kg body weight and 42-217 days old) made up of 36 barrows and 26 gilts were slaughtered after 18 hours of fasting, and their empty bodies were ground and analyzed for moisture, fat, protein and ash, and their body energy values determined. A rectilinear model, Y-a+bx, and a curvilinear model, Y=ax, were fitted to the data with the weights of the chemical components or the gross energy value as the predictands and the shrunk empty body weight (SEBW) as the predictor. The relationship between the weights of protein, fat, water and the amount of energy in the empty body, on the one hand, and SEBW, on the other hand, was curvilinear but the relationship between the weight of ash in the empty body and SEBW was linear. High R2 values of 0.95-0.99 were obtained with both the linear and curvilinear models. However, the coefficient of variation between the measured and the predicted chemical components was reduced by as much as 63-76% by using the curvilinear model rather than the linear one for water, fat and energy, but was increased by as much as 95% for ash. It is concluded that body weight is an accurate predictor of body composition in pigs, and since it is easier and less expensive to measure than more sophisticated indirect methods, it should have wider applicability
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