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タイトル: Changes in Plasma Metabolic Hormone Concentrations during the Ovarian Cycles of Japanese Black and Holstein Cattle
著者: Kawashima, Chiho
Kida, Katsuya
Hayashi, Ken-Go
Amaya Montoya, Carlos
Kaneko, Etsushi
Matsunaga, Nobuyoshi
Shimizu, Takashi
Matsui, Motozumi
Miyake, Yoichi
Schams, Dieter
Miyamoto, Akio
キーワード: Cattle
Insulin-like growth factor-I
Ovarian cycle
Progesterone
発行日: 29-Nov-2006
出版者: 日本繁殖生物学会
誌名: Journal of Reproduction and Development
巻: 53
号: 2
開始ページ: 247-254
抄録: The aim of the present study was to investigate the changing profiles of plasma metabolic hormones during the ovarian cycles of beef and dairy cattle. We used 16 non-pregnant, non-lactating Japanese Black beef cattle (6 heifers and 10 cows; parity=2.3 ± 0.8) and 12 multiparous Holstein dairy cows (parity=3.0 ± 0.3). Blood samples for hormonal analysis (growth hormone, GH; insulin-like growth factor-I, IGF-1; insulin; and progesterone, P4) were obtained twice weekly for 40 days before artificial insemination for Japanese Black cattle and from 50 to 100 days postpartum for Holstein cows. Luteal phases were considered normal if the P4 concentrations for at least 3 time points over the course of 7 days remained above 1 ng/ml and at least 2 of the time points were above 2 ng/ml. The patterns of the ovarian cycles were classified into two types (normal or abnormal, such as having prolonged luteal phase and cessation of cyclicity) on the basis of the plasma P4 profiles. The plasma concentrations of IGF-1 in both breeds increased transiently during the preovulatory period when the P4 levels were low and decreased to lower levels during the luteal phase when the P4 levels were high. The plasma concentrations of insulin in the 3rd week of normal ovarian cycles when the plasma P4 concentration dropped to less than 1 ng/ml were higher than those at other time points in the Japanese Black cattle, but not in the Holstein cows. The plasma concentrations of GH did not change during the ovarian cycle in either breed. In conclusion, the present study indicates that the plasma IGF-1 concentration increases during the follicular phase (low P4 levels) and decreases during the luteal phase (high P4 levels) in non-lactating Japanese Black and lactating Holstein cattle. The results suggest that ovarian steroids, rather than nutrient status, may be related to the cyclic changes in IGF-1 secretion from the liver in cattle.
URI: http://ir.obihiro.ac.jp/dspace/handle/10322/920
ISSN: 0916-8818
権利情報: 日本繁殖生物学会
出現コレクション:03001学術雑誌論文

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