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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

期刊文章

Equine chorionic gonadotropin (eCG) administration after insemination affects luteal function and pregnancy establishment in postpartum anestrous beef cows  [2017]

Núñez-Olivera, R.; de Castro, T.; Bó, G.A.; Piaggio, J.; et al.

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Two experiments were conducted with the aim of determining the effect of equine chorionic gonadotropin (eCG) administration on day 14 after insemination on ovarian response and pregnancy establishment in postpartum anestrous beef cows. In both experiments, cows were subjected to a progesterone- and estradiol-based treatment for fixed-time artificial insemination (FTAI), and were randomly allocated into four groups to receive or not receive eCG (400 IU) at the time of device removal and/or at 14 d after FTAI. In Experiment 1, from day 14 to 22, daily ultrasonographic determinations were performed to monitor ovarian dynamics, and blood was collected to determine hormone concentrations in 60 cows. In Experiment 2, confirmation of pregnancy was performed at 30 and 60 d after FTAI in 1,060 anestrous cows assigned to the same experimental design. Cows that received eCG on day 14 after FTAI showed increases in corpus luteum area (P < 0.01), follicle diameter (P < 0.05), serum progesterone concentrations (P < 0.01), and estradiol-17β concentrations (P < 0.01), compared with cows that did not receive eCG on day 14. Pregnancy rate on day 30 was greater in those cows that received both eCG treatments (i.e. at device removal and 14 d after insemination) than in those that did not receive eCG treatment (P < 0.05). In conclusion, eCG administered on day 14 after FTAI increases serum progesterone concentrations during the critical period of pregnancy in anestrous cows,
and this second eCG treatment seems to have a positive effect on achieving pregnancy.
来自期刊
Domestic animal endocrinology
ISSN : 0739-7240

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2018
出版者:
Elsevier Inc.
所有题名:
"Equine chorionic gonadotropin (eCG) administration after insemination affects luteal function and pregnancy establishment in postpartum anestrous beef cows"@eng
其它:
"Pre-press version"
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2018
出版者:
Elsevier Inc.
所有题名:
"Equine chorionic gonadotropin (eCG) administration after insemination affects luteal function and pregnancy establishment in postpartum anestrous beef cows"@eng
其它:
"Pre-press version"