The influence of growth hormone on growth in young cattle

摘要

Twelve pairs of identical-twin heifer calves were divided into 3 groups. For 12 consecutive weeks daily injections were carried out as follows: Group 1 Growth hormone 5 mg/100 lb body weight Group 2 L-thyroxine 0.5 mg/100 lb body weight Group 3 Normal saline 1 cm3