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Reduction of energy requirements of steers fed on low-quality-roughage diets using trenbolone acetate

Published online by Cambridge University Press:  09 March 2007

R. A. Hunter  and
J. E. Vercoe
R. A. Hunter
Affiliation:
CSIRO, Division of Tropical Animal Science, Tropical Cattle Research Centre, North Rockhampton, Queensland 4702, Australia
J. E. Vercoe
Affiliation:
CSIRO, Division of Tropical Animal Science, Tropical Cattle Research Centre, North Rockhampton, Queensland 4702, Australia
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Abstract

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1. Six steers implanted with 300 mg trenbolone acetate and six steers not implanted were fed on low protein, low-quality-roughage diets ad lib. in two experiments. The steers were Hereford (Bos taurus) × Brahman (Bos indicus) crossbreds (50:50), initially of about 400 kg mean live weight (LW). In the first experiment of 8 weeks duration roughage was given alone. In the second experiment of 6 weeks duration the diet was supplemented with 100 g urea and 4.6 g sulphur daily. The same steers were implanted in each experiment. At the conclusion of each experiment metabolic rate was measured after a 72 h fast.

2. In the first experiment control and implanted steers had similar rates of LW loss (0.57 and 0.59 kg/d respectively). Implanted steers had significantly (P < 0.01) lower feed intakes (12.8 v. 10.9 g dry matter (DM)/kg LW), significantly (P < 0.01) lower fasting metabolic rates even after adjustment for intake (83.3 v. 74.5 kJ/kg per d) and significantly (P < 0.01) lower plasma insulin concentrations (24 v. 19 μunits/ml). Differences in plasma concentrations of free 3,5,3′-triiodothyronine (T3), non-esterified fatty acids and urea-nitrogen were not significant.

3. In the second experiment intake of the supplement diet was similar in both control and trenbolene acetate treated steers (19.5 and 20.0 g DM/kg LW respectively). LW gains were 0.23 and 0.41 kg/d for control and implanted steers respectively, the difference being s ignificant (P < 0.05). Fasting metabolic rate (76.9 v. 70.7 kJ/kg per d) was significantly (P < 0.05) lower in implanted steers.

Type
General Nutrition papers
Information
British Journal of Nutrition , Volume 58 , Issue 3 , November 1987 , pp. 477 - 483
Copyright
Copyright © The Nutrition Society 1987

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