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Energy and Protein Intakes by Growing Swine. II. Effects on Rate and Efficiency of Gain and on Carcass Characteristics¹

University of Minnesota, St. Paul

Abstract

REFERENCE has been made previously (Greeley et al., 1964) to the effects of inclusion of fat in the diet on rate and efficiency of gain of growing swine and on nutrient digestibility. Bowland and Berg (1959) and Kuryvial et al. (1962) reported deleterious effects on carcass quality of high energy rations and supplemental fat. Clawson et al. (1962) were unable to demonstrate that inclusion of 5 or 10% of animal fat in diets of growing pigs significantly affected carcass leanness.

Several groups of investigators (Ashton et al., 1955; Bowland and Berg, 1959; Kropf et al., 1959; Kuryvial et al., 1962; Wagner et al., 1963) have reported that increasing the protein content of the diet improved rate and efficiency of gain of growing pigs as well as carcass leanness. Neither Aunan et al. (1961) nor Clawson et al. (1962) was able to show that increasing protein content of the diet increased carcass leanness.

¹ Paper No. 5231, Scientific Journal Series of the Minnesota Agricultural Experiment Station. A portion of the data included in this publication was taken from a thesis submitted to the Graduate School, University of Minnesota, Minneapolis, by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

² Present address: Almirante Pastene #7, Casilla 2-P, The Rockefeller Foundation, Santiago, Chile, South America.

³ Acknowledgment is due the following for generous supplies of some materials essential to the conduct of these studies : Van Hoven Co., South St. Paul, Minn.; Merck, Sharp and Dohme, Research Laboratories, Rahway, N. J.; and Chas. Pfizer and Co., Inc., Terre Haute, Ind. Appreciation is expressed to Swift and Co., South St. Paul, Minn., for generous assistance and cooperation in the collection of the detailed carcass data.