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Influence of Protein Level, Amino Acid Ratio and Caloric Density of the Diet on Feed Intake and Performance of Pigs^{1, 2,}

North Carolina Agricultural Experiment Station, Raleigh

Abstract

A total of 180 weanling pigs were used in three experiments to determine the influence of protein level and ratio of protein from corn and soybean meal on voluntary feed intake of diets of varying caloric density. Animal fat (yellow grease) was used to vary dietary caloric density. Protein level and caloric density of the diet each influenced daily feed intake independently. Daily caloric intake was greatly depressed by increasing levels of dietary calories when protein level was inadequate and was even more depressed when the diet contained an amino acid imbalance. Daily feed intake was not significantly influenced by protein level as long as amino acid balance was adequate. The depression in caloric intake resulting from increasing caloric density was not evident when low-protein diets containing high quality protein was fed.

¹ Contribution from the Animal Science Department, North Carolina Agricultural Experiment Station, Raleigh, N. C. Published with the approval of the Director of Research as Paper No. 2189 of the Journal Series.

² This study was partially supported by the National Renderers Association, Des Plaines, Illinois.