Effect of a growth promoter on preweaning growth of beef steer calves.
The influence of a growth promoter on preweaning growth of beef steer calves in the Kalahari thornveld and shrub bushveld was investigated. Calves (n = 40) implanted with a testosterone propionate-oestradiolbenzoate compound at an average age of 120 d, attained a higher (P < 0,005) weaning mass (256,7 vs 239,1 kg) and superior gains (93,9 vs 79,9 kg) over the trial period than the control group (n = 40).
Van Zyl
J G
JG
Department of Livestock Science, University of Pretoria, Republic of South Africa.
D000818:Animals; D002417:Cattle / Q000254:growth & development*; D004338:Drug Combinations; D004343:Drug Implants; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D006133:Growth Substances / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D011897:Random Allocation; D013739:Testosterone / Q000008:administration & dosage / Q000494:pharmacology*; D014886:Weaning; D015430:Weight Gain / Q000187:drug effects*
D004338:Drug Combinations; D004343:Drug Implants; D006133:Growth Substances; D013739:Testosterone; D004958:Estradiol