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PubMed1978

Some effects of reduced energy intake on the development of anaplasmosis in Bos indicus cross steers.

Some effects of the plane of nutrition on the development of anaplasmosis in Brahman cross steers were investigated. Batches of 39 and 30 Brahman cross steers, aged approximately 27 months were each divided by stratified randomisation into 4 groups of similar mean PCV and body weight. Two similar experiments, designated A and B were conducted. Groups 1 and 2 were fed a ration of lucerne chaff at the rate of 1 M Cal ME/80 kg live weight/day for 8 weeks aimed to reduce body weight by approximately 5 kg/week. Animals in groups 3 and 4 were fed a ration for the same period aimed to increase body weight by approximately 2 kg/week. Groups 1 and 3 were then inoculated with approximately 10(10) Anaplasma marginale infected erythrocytes and the effects of the subsequent infections during the clinical and recovery phases were examined by measuring humoral antibody response, packed cell volume, parasitaemia and body weight. Groups 2 and 4 were uninfected controls. Anaplasmosis, as measured by three responses, was less severe in the starved animals of group 1. Significant differences in packed cell volume and parasitaemia were detected for short periods between the infected groups 1 and 3. Anaplasmosis caused losses of 6.2% and 5.9% in the mean body weight of group 3 animals in experiments A and B respectively. Most of this loss occurred during the clinical phase of the disease. The disease caused no apparent loss of weight in the infected animals of group 1.

Anaplasmosis↗
PubMed1985

Effects of adrenalectomy on energy balance of obese mice are diet dependent.

Obese (ob/ob) and lean mice were adrenalectomized at 3 or 6 wk of age and fed a high-carbohydrate stock diet or a high-fat semipurified diet for 3 wk. Adrenalectomy of obese mice fed the stock diet reduced the energy intake, energy gain, and efficiency of energy retention so that the values equaled those of lean mice. Hindlimb muscle gain of adrenalectomized obese mice fed the stock diet increased by 50-100%, and concentrations of plasma insulin were reduced so that they also approached values in lean mice. In contrast to results obtained when the stock diet was fed, adrenalectomy of obese mice fed the high-fat diet resulted in only slight reductions in energy intake, energy gain, or efficiency of energy retention. Likewise, muscle gain was not improved nor were plasma insulin concentrations decreased when adrenalectomized obese mice were fed the high-fat diet. Although adrenal secretions contribute substantially to the gross obesity that develops in ob/ob mice fed the stock diet, these secretions are unnecessary for development of obesity in ob/ob mice fed the high-fat diet. Factors other than adrenal secretions per se, which are influenced by diet composition, thus mediate development of obesity in ob/ob mice.

Adrenal Glands↗