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Abstract
A series of digestion and metabolism experiments with pigs and poultry were conducted to evaluate the variation in available energy values in 18 samples of commercial normal corn (NC) and to compare the energy utilization of NC hybrids and three samples of high-oil corn (HOC) hybrids. Our studies at the University of Missouri estimated the variation of available energy values of NC hybrids to be approximately 5% for swine DE and ME values, 8% for adult rooster TMEn values, and 9% for young broiler chicken AME values. In NC hybrids, there were no correlation relationships between crude protein (CP) and crude fat (ether extract), or CP and lysine, or CP and methionine contents. The available energy values for HOC hybrids were greater than NC hybrids in both swine and poultry. Since HOC hybrids contained more fat and protein than NC hybrids, it is reasonable that available energy values would be greater than NC hybrids. Also the average amino acids digestibility of HOC hybrids were greater (5%) than those of NC hybrids in young broiler chickens. Within NC hybrids, there were no correlation and regression relationships between swine and poultry energy values. Proximate analysis results can not be used to predict the in vivo energy values in NC hybrids. Poultry energy values (TMEn and AME) were not an adequate animal model for the prediction of the swine energy values between normal corn hybrids.
