Trenbolone acetate/estradiol combinations in feedlot steers: dose-response and implant carrier effects

Article Abstract:

The dose-response effects for a trenbolone acetate/estradiol combination implant for use in steers as well as the possible effects of various carriers for the implant were investigated. The use of either cholesterol or lactose as the carrier did not affect the efficacy of the implant, and neither did estradiol level. The highest dosage combination of 140 mg trenbolone with 28 mg estradiol resulted in effects that were better than estradiol alone. Combination-treated cattle had increased longissimus muscle area and decreased carcass marbling score compared to untreated controls, with no difference in carcass quality from estradiol-treated animals.

Physiological aspects, Hormone research, Estradiol

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Effects of a growth hormone-releasing factor analogue and an estradiol-trenbolone actate implant on somatotropin, insulin-like growth factor I, and metabolite profiles in growing Hereford steers

Article Abstract:

Trenbolone-estradiol implatation in steers resulted in higher average daily weight gain than that of controls. The implant did not affect serum levels of somatotropin. The chronic administration of a growth hormone-releasing analogue with or without the implant resulted in similar increases in somatotropin levels. The levels of insulin-like growth factor 1 were also increased, but implanted animals had an attenuated response. Plasma urea nitrogen concentrations were decreased by both the implant and growth hormone-releasing analogue.

Somatotropin, Anabolic steroids, Insulin-like growth factor 1, Insulin-like growth factor I, Somatotropin releasing hormone, Somatotropin-releasing hormone

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Evaluation of sodium thiosulfate as an extracellular water marker in cattle

Article Abstract:

The capacity of sodium thiosulfate (THS) to measure extracellular water (ECW) in relation to empty body water (EBW) estimation by urea space was tested using two groups of steers. One group was used to demarcate the clearance parameters for THS and urea and the other to measure ECW with THS and sodium thiocyanate. Intracellular water and lean body mass can be derived by using markers for EBW and ECW.

Usage, Measurement, Composition, Body composition, Cattle, Sulfates

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