p-agonist lean efficiency enhancing agents are often referred to as repartitioning agents because of their ability to redirect nutrients away from adipose tissue and toward muscle. In general, the effects of p-agonists are improved feed utilization efficiency, increased leanness, increased dressing percentage (carcass weight/live weight), and increased rate of weight gain. These effects have been demonstrated in lambs, broilers, turkeys, beef cattle, and swine. Several factors including diet, dosage and duration of treatment, age, weight, and genetics have been shown to influence the response to p-agonists (Table 1) and are important to the successful implementation of p-agonists to livestock.
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