Abstract
Eleven steers aged 12-14 months were divided into groups of three based on age, breed and liveweight. One animal in each group was implanted with trenbolone acetate, another with trenbolone acetate + oestradiol-17β, and the third animal served as control. The mean liveweight gains throughout a 9 week period were 54.3 kg, 64.3 kg and 77.2 kg for control, trenbolone acetate and trenbolone acetate + oestradiol treated groups respectively. The mean values for weight gains of the treated animals were significantly higher (P < 0.05) than the control values. The improvement in feed conversion in the treated animals was significant (P < 0.001) in the animals receiving trenbolone acetate + oestradiol.No changes were seen in the plasma concentrations of growth hormone, prolactin and insulin. There was, however, a significant decrease in the concentration of total thyroxine in the plasma of the treated animals. The decrease was greatest in steers implanted with trenbolone acetate + oestra- diol-17β. The levels of serum urea and albumin were decreased in the steroid treated animals, whereas there were no alterations in the concentrations of plasma glucose, or serum total protein, magnesium, calcium, inorganic phosphorus, iron, copper, sodium and potassium.Some modifications of behaviour were noted in steers implanted with the combined steroid preparation.
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