Relationship among insulin-like growth factor-I, blood metabolites and postpartum ovarian function in dairy cows

被引:71
|
作者
Zulu, VC
Sawamukai, Y
Nakada, K
Kida, K
Moriyoshi, M
机构
[1] Rakuno Gakuen Univ, Grad Sch Vet Med, Dept Obstet & Gynecol, Ebetsu, Hokkaido 0698501, Japan
[2] Large Anim Clin, Ebetsu, Hokkaido 0690805, Japan
[3] Res Ctr, Ebetsu, Hokkaido 0690805, Japan
来源
JOURNAL OF VETERINARY MEDICAL SCIENCE | 2002年 / 64卷 / 10期
关键词
bovine; IGF-1; ovarian function; postpartum;
D O I
10.1292/jvms.64.879
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
The relationship among nutritional status, systemic insulin-like growth factor-I (IGF-I) and ovarian function early Postpartum were investigated. A total of 27 Holstein-Friesian cows, 10 that cycled normally within 20 days postpartum, 5 diagnosed with follicular cysts, 8 with persistent corpus luteum (CL) after the first ovulation postpartum and 4 with inactive ovaries were used for the study. Blood samples were collected 1-3 times per week, for 60 days pre- and postpartum, for IGF-I, progesterone, estradiol, free fatty acids (FFA), blood urea nitrogen (BUN), and aspartate aminotransferase (AST) determination. Inactive ovary and cystic cows had a higher body condition score before calving and lost more condition than normal or persistent CL cows. Immediately postpartum, IGF-I levels were higher and rose sharply in cows that cycled normally than in cystic, inactive ovary or persistent CL cows. At calving and early postpartum, FFA was higher in inactive ovary and cystic than in normal and persistent CL cows. There was a significant strong positive relationship between IGF-I and BUN, and strong negative relationships between IGF-I and FFA and AST in all groups. There was a positive relationship between serum IGF-I and estradiol in normal cystic and inactive ovary cows. This study found that overconditioned cows during the dry period or at calving, lost more body condition postpartum. These cows also had a deeper and longer period of negative energy balance (NEB), poor liver function and low circulating IGF-I concentrations early postpartum. Such cows were likely to have poor reproductive function as seen in development of cystic ovaries, persistent CL and inactive ovary. Changes in serum IGF-I early postpartum may help predict both nutritional and reproductive status in dairy cattle.
引用
收藏
页码:879 / 885
页数:7
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