Response time of broiler chickens to cimaterol: meat tenderness, muscle composition, fiber size, and carcass characteristics

Article Abstract:

Broiler chicken carcass characteristics, muscle fiber size, muscle composition, catheptic enzyme activity and tenderness were examined with respect to their response time to cimaterol. Cimaterol is a beta-adrenergic agonist which is known to decrease fat accumulation and enhance protein accretion in sheep, swine and poultry. The results showed that muscle tenderness differences began to be noted in thigh muscle and in breast muscle after four days and eight days, respectively, of cimaterol diet. Cimaterol may mediate its effects by decreasing the degradation of skeletal muscle proteins.

Growth, Broilers (Poultry), Broilers (Chickens), Adrenergic beta agonists, Adrenergic beta-agonists

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Skeletal muscle protein metabolism and serum growth hormone, insulin, and cortisol concentrations in growing steers implanted with estradiol-17-beta, trenbolone acetate, or estradiol-17-beta plus trenbolone acetate

Article Abstract:

The effect of anabolic steroids on skeletal muscle protein metabolism in cattle was investigated. Circulating concentrations of growth hormone, insulin and cortisol as well as skeletal muscle protein breakdown were assessed in steers before and after implantation with estrogen (E), trenbolone acetate (TBA), or E + TBA. The results showed that estrogen implantation increased muscle protein deposition in steers, and this effect was enhanced when estrogen was combined with TBA. Furthermore, increased muscle protein was not due to a decrease in muscle protein degradation.

Estrogen, Estrogens, Insulin, Bovine somatotropin

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Influence of trenbolone acetate combined with estradiol-17beta on growth performance, body characteristics, and chemical composition of goat kids fed milk and slaughtered at different ages

Article Abstract:

A study was done to ascertain the effects of trenbolone acetate combined with estradiol-17beta on growth performance, body characteristics and chemical composition of 58 intact male goat kids fed milk and then slaughtered. Results show that there is an increase in retention of body protein in the carcass with an observed decrease of adipose tissue development in goat kids implanted with anabolics at a young age. The partitioning process was observed to occur even with low feed intake.

Research, Evaluation, Body composition, Goats

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