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Influence of Hormone Supplementation, Dietary Protein Level and Sex on the Performance and Carcass Quality of Swine^{1, 2,}

Florida Agricultural Experiment Station, Gainesville 32601

Abstract

Performance and carcass quality in swine are affected by feeding methods and diet quality. Wallace et al. (1966) reported that swine restricted in either total diet or energy intake produced leaner carcasses than full fed pigs. Other workers have reported that carcass leanness in swine is improved with increasing levels of dietary protein (Ashton et al., 1955; Wagner et al., 1963; Hale and Southwell, 1967; Wallace, 1968). Sex has been shown to be a factor which affects both pig performance and carcass leanness (Teague et al., 1964; Blair and English, 1965; Plimpton et al., 1967; Wallace et al., 1966; Hale and Southwell, 1967). Using carcass objective measurements, it has been shown that boars are superior to gilts, and gilts are superior to barrows. Plimpton et al. (1967) reported an increase in performance and carcass leanness in boars implanted with 96 mg of diethylstilbestrol at 70.4 kg live weight. Other workers (Baker et al., 1967; Doornenbal and Frankenham, 1969) have demonstrated a carcass improvement in barrows and gilts supplemented with a combination of diethylstilbestrol and methyltestosterone.

¹ Florida Agricultural Experiment Station Journal Series No. 3871.

² This work was supported in part by a grant from Eli Lilly and Company, Greenfield, Indiana.