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Effects of Castration on Ovine Neutral and Phospholipid Deposition¹

University of Kentucky, Lexington 40506

Abstract

The fat of wether lambs has been reported to be more saturated than the fat of ram lambs (Tichenor et al., 1970; Crouse et al., 1971). However, Kemp et al. (1970) also indicated that wethers have more total fat than rams. Thus, confounded effects of hormones and quantities of deposited lipids have been observed so that it is impossible to determine the effects of either. Callow (1958) suggested that ovine tissues containing greater amounts of lipids have lower iodine numbers, indicating a dilution of unsaturated fatty acids (F.A.) by endogenous synthesis of saturated fatty acids. Koch, Parr and Merkel (1968), studied porcine lipid and observed variations in F.A. composition in different sexes, but attributed these to differences in quantities of lipid present.

The objective of this study was to determine the effects of castration on the fatty acid composition of ovine subcutaneous and perinephric adipose tissue and the neutral lipid and phospholipid fractions of the longissimus muscle.

¹ The investigation reported in this paper (71-5-67) is in connection with a project of the Kentucky Agricultural Experiment Station and is published by permission of the Director.

² Present address: U. S. Meat Animal Research Center, Clay Center, Nebraska 68933.