Responses of calves to treadmill exercise during beta-adrenergic agonist administration

Article Abstract:

Results of a study indicated that significant metabolic, endocrine and respiratory changes were observed in calves at early stages of exposure to Beta-A but prolonged administration resulted in de-sensitization to the drug. The study assessed cardio respiratory, metabolic and hormonal adaptation to treadmill exercise, in calves subjected to Beta-adrenergic agonist (Beta-A) clenbuterol, for short and long duration. Resensitization after withdrawal was also assessed. Calves were administered Beta-A clenbuterol, perorally. Results After withdrawal, re-sensitization was observed within seven days of re-exposure to Beta-A.

Physiological aspects, Treadmill exercise tests, Adrenergic beta agonists, Adrenergic beta-agonists

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Alteration of energy metabolism of calves fed below maintenance during 6 to 14 days of age

Article Abstract:

The effect of feeding level on energy metabolism of newly-transported young calves was studied. Adaptation to the new environment seemed to be a factor in the determination of metabolic rate. Whether the change in the relationship between heat production and metabolic rate is due to aging or a manifestation of the adaptive mechanism is unclear. These calves are not considered as having attained a steady state of energy metabolism, and are very dependent on body energy stores.

Food and nutrition

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Effects of the alpha2-adrenoreceptor agonist guanfacine on growth and thermogenesis in mice

Article Abstract:

An experiment was conducted to study the effects of guanfacine on the growth and thermogenesis of mice. Results from the study show that guanfacine lowers metabolic rate resulting to a reduction of energy needed for maintenance and improvement of growth efficiency. Mice were shown to develop a resistance to the effects of guanfacine. However, reduced appetite and the loss of energy, water and protein tend to predominate resulting to a decrease in growth rate in mice.

Mice, Mice (Rodents), Growth, Thermogenesis

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