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Age-related changes of growth hormone secretion and somatotroph function in Japanese Black Steers

Published online by Cambridge University Press:  05 November 2021

M. Matsuzaki ,
E. Tsuneishi ,
R. Takada ,
Y. Kaji ,
N. Shiba ,
S. Hara ,
K. Ozutsumi  and
T. Yamaguchi
M. Matsuzaki
Affiliation:
Kyushu National Agricultural Experiment Station, Nishigoshi-machi, Kumamoto 861-11, Japan
E. Tsuneishi
Affiliation:
Kyushu National Agricultural Experiment Station, Nishigoshi-machi, Kumamoto 861-11, Japan
R. Takada
Affiliation:
Kyushu National Agricultural Experiment Station, Nishigoshi-machi, Kumamoto 861-11, Japan
Y. Kaji
Affiliation:
Agriculture, Forestry and Fisheries Research Council Secretariat, Kasumigaseki, Chiyoda-ku, Tokyo 100, Japan
N. Shiba
Affiliation:
Kyushu National Agricultural Experiment Station, Nishigoshi-machi, Kumamoto 861-11, Japan
S. Hara
Affiliation:
Kyushu National Agricultural Experiment Station, Nishigoshi-machi, Kumamoto 861-11, Japan
K. Ozutsumi
Affiliation:
Kyushu National Agricultural Experiment Station, Nishigoshi-machi, Kumamoto 861-11, Japan
T. Yamaguchi
Affiliation:
Tohoku University, Amamiya-machi, Aoba-ku, Sendai 981, Japan
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Extract

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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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 52
Copyright
Copyright © British Society of Animal Science 1997

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References

McAndrews, J. M., Stroud, C. M., MacDonald, R. D., Hymer, W. C. and Deaver, D. R. 1993. Age-related changes in the secretion of growth hormone in vivo and in vitro in infantile and prepubertal Holstein bull calves. Journal of Endocrinology 139: 307–315.CrossRefGoogle ScholarPubMed
Verde, L. S. and Trenkle, A. 1987. Concentrations of hormones in plasma from different growth potentials. Journal of Animal Science 64: 426–432.CrossRefGoogle ScholarPubMed
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