Implications of removing or altering the testicles of ram lambs on the financial returns from carcasses

摘要

Abstract Altering the influence of the testicles of male lambs is used to manipulate growth and body composition. To determine the effects on carcass weight and consequently returns to farmers, an analysis was undertaken from studies in the scientific literature in which animals were slaughtered at the same time. Each dataset was treated as if it were a random event and a model of sex type (including ram, cryptorchid, and wether) was fitted. Rams, cryptorchids and wethers slaughtered on the same date had similar carcass weights. Cryptorchid carcass weights ranged from 95–102%, and wethers 87–107%, of the weight of ram carcasses. Based on this range in responses to altering testicular function, at an intermediate carcass weight of 17.5 kg and at $4/kg, returns from cryptorchids ranged from $3.50 less than to $1.40 more than rams. Similarly, returns from wethers ranged from $9.10 less than to $4.90 more than rams. In conclusion, the carcass weight benefits of not castrating ram lambs are variable and, depen...