Abstract
Growth hormone (GH) is a vital component for the regulation of animal growth. The circulating levels of GH decrease with age in bull calves (McAndrews et al., 1993) and in steers (Verde and Trenkle, 1987), and are higher in large Simmental steers than in small Angus steers (Grigsby and Trenkle, 1986). Japanese Black cattle, known as Wagyu, is early-matured and small frame size, and has an ability to deposit the high amount of intramuscular fat. The present study was conducted to clarify the age-related changes of GH secretion and somatotroph function in Japanese Black steers, since the information about endocrine profiles of Japanese Black cattle has been scantly.
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