title: Fatty acids in carcass fat of steers treated with a β-adrenergic agonist individually or in combination with trenbolone acetate + oestradiol-17β.
abstract: Forty steers of medium maturity were allocated randomly to four treatment groups of 10 steers each (C = Control, βA = β-Agonist, TO = Trenbolone acetate + oestradiol-17β and βTO = β-Agonist in combination with trenbolone acetate + oestradiol-17β). After 56 days on treatment, the β-Agonist treatment was stopped and the steers slaughtered on the ninth day after withdrawal. Samples of subcutaneous fat over the 13th rib and M. longissimus dorsi were stored in sealed polyethylene bags at -20 °C for fatty acid analysis. A greater proportion of oleic acid (C18: 1, P < 0.05) was deposited in the subcutaneous fat of steers treated with βA as opposed to those treated with either TO or βTO. Treatments altered the fatty acid composition of the M. longissimus dorsi, particularly through their effects on palmitic acid (C16:0, P < 0.01), palmitoleic acid (C16:1, P < 0.01) and oleic acid (C18:1, P < 0.01). The results suggest a shift (P < 0.01) towards saturated fatty acids in the M. longissimus dorsi of steers treated with either βA or βTO.
authors: Department of Animal and Wildlife Sciences, Faculty of Biological and Agricultural Sciences, University of Pretoria, Pretoria, 0002, Republic of South Africa.
authors: E C
authors: EC
authors: Webb
authors: N H
authors: NH
authors: Casey