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Caloric Density of the Diet and the Lysine Need of Growing Swine

Illinois Agricultural Experiment Station, Urbana

Abstract

Three experiments were conducted to determine the effect of varying caloric density of the diet on the lysine requirement of the growing pig fed a corn-sesame meal diet containing 16% protein. Incorporation of cellulose, corn starch or lard at the 10% level into such a diet yielded levels of metabolizable energy values of 2926, 3267 and 3718 kcal. per kilogram, respectively.

With the pig averaging from 16 or 22 kg. initially, the rate of gain and gain-feed ratio were influenced by the dietary lysine levels fed. There was no evidence of interaction between lysine level and energy level of the diet on rate of gain, but there was a significant interaction for gain-feed ratio in one experiment. The calculated lysine needs, expressed as percent of the diet, were 0.65, 0.77 and 0.80 for maximum rate of gain and 0.66, 0.71 and 0.85 for maximum feed efficiency in diets containing 2926, 3267 and 3718 kg. per kilogram, respectively. These values are equivalent to an average lysine need in the diet equal to 0.23% per 1000 kcal. ME.

The response of the growing pig averaging about 13 kg. initially indicated a lysine need for maximum feed efficiency of 0.80 and 0.98% of diets containing 2926 and 3718 kcal. per kilogram, respectively.

¹ Present address: Commercial Solvents Corporation, Terre Haute, Indiana.

² The authors wish to acknowledge Merck & Co., Rahway,New Jersey; Chas. Pfizer and Co., Inc., Brooklyn, N. Y.; and Dow Chemical Co., Midland. Michigan, for funds and products which made this study possible.