SHORT COMMUNICATION
Characteristics of milk production and plasma
levels of growth hormone and insulin in Japanese
Black cows
1
Department of Animal Production and Grasslands Farming, National Agricultural Research,
Center for Tohoku Region, Morioka, Iwate, 020-0198, Japan
2
School of Veterinary Medicine and Animal Sciences, Kitasato University,
Towada, Aomori, 034-8628, Japan
3
National Institute of Advanced Industrial Science and Technology,
Tsukuba, Ibaraki, 305-8561, Japan
Publication date: 2004-08-30
Corresponding author
H. Shingu
Department of Animal Production and Grasslands Farming, National Agricultural Research, Center for Tohoku Region, Morioka, Iwate, 020-0198, Japan
Department of Animal Production and Grasslands Farming, National Agricultural Research, Center for Tohoku Region, Morioka, Iwate, 020-0198, Japan
J. Anim. Feed Sci. 2004;13(Suppl. 1):559-562
KEYWORDS
ABSTRACT
The aim of present study was to examine characteristics of milk yield and secretion of growth
hormone (GH) and insulin in Japanese Black cows (beef type) during lactation. (Experiment 1) Milk
yield and plasma concentrations of hormones in Japanese Black cows were compared with those in
Holstein cows (dairy type). Japanese Black cows had smaller milk yield and secreted less GH but
more insulin than Holstein cows. (Experiment 2) Effects of GH-releasing hormone (GHRH) on milk
yield and plasma concentrations of hormones in Japanese Black cows were examined. Treatment
with GHRH induced increases in milk yield (17.4%) and in GH and insulin concentrations.
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| ISSN: | 1230-1388 |
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