Effects of zeranol and two dietary levels of calcium and phosphorus on performance, carcass and bone characteristics, and calcium status in growing lambs

Article Abstract:

Lambs with zeranol implants were found to have greater average daily weight gains, daily feed intakes and feed utilization efficiency than nonimplanted controls. Interaction between the implant and the dietary calcium (Ca) and phosphorus (P) treatment given was found for kidney and pelvic fat and yield grade. Implanted lambs were found to have greater bone cortical area, which correlated to greater bone breaking load. Lambs fed higher levels of Ca and P had higher mineral deposition in bone and higher serum Ca levels. Serum parathyroid hormone and serum Ca levels were higher at the initial sampling time than at the subsequent one.

Research, Metabolism, Calcium metabolism, Implants, Artificial, Prostheses and implants, Phosphorus (Chemical element), Lambs, Phosphorus metabolism, Zeranol

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Periodic changes in body composition and in priorities for tissue storage and retrieval in mature beef cows

Article Abstract:

Breed type and season affect the body composition of mature Angus and Simmental cows. Angus cows had less empty body protein and more body fat as compared to Simmental cows. Both breeds have cyclical nature in empty body protein mobilization. While empty body fat is gained, empty body protein is lost in the summer. The protein lost is replenished in winter and spring. The difference in priorities for deposition or mobilization of protein and fat influence the body composition in each season. Thus, nutrient requirements for cows may differ as the seasons change.

Environmental aspects, Food and nutrition, Body composition, Cattle, Aberdeen-Angus cattle, Aberdeen Angus cattle, Simmental cattle

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Dose-response effects of recombinant bovine somatotropin implants on feedlot performance in steers

Article Abstract:

Feedlot steers were implanted with varying doses of recombinant bovine somatotropin (rbST) to determine the maximally effective dose for growth performance and carcass protein deposition. The results showed that rbST increased growth performance. Weekly rbST implants of the maximally effective dose of 160 mg/week increased carcass protein deposition and decreased carcass fat. Dressing percentage was not affected, indicating that the primary effect of rbST is on the carcass and not on the non-carcass components.

Beef cattle, Dosage and administration, Growth (Physiology), Animal feeding and feeds, Feed utilization efficiency, Bovine somatotropin

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