NUTRIENT REQUIREMENTS FOR GROWING AND FINISHING PIGS

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Abstract
Pig diets for growth and finishing were formulated by linear programming for least cost, and according to the nutrient requirements specified by the U.S. NRC and the British ARC. They were fed to 72 pigs from weaning to finishing, and provided observations on the digestibility of feed, utilization of feed, digestible energy and digestible crude protein, gain in body weight, and quality of carcass. The pigs gained faster and more efficiently than expected from NRC and ARC standards. Pigs fed the ARC diets required less digestible energy per kg gain than pigs fed the NRC diets. The higher levels of protein, vitamins A and D, calcium and phosphorus of ARC standards did not enhance performance. The higher NRC level of digestible energy was not essential to maintain maximum daily gain. The ARC recommendations for lysine and methionine were found to be adequate.

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