Ovarian follicular development following administration of progesterone or aspiration of ovarian follicles in holstein cows
| Autor: | S. D. Van Camp, J. Cavalieri, P.W. Farin, Jack H. Britt, S.P. Washburn, J. E. Kinder, M. D. Whitacre |
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| Rok vydání: | 2001 |
| Předmět: |
Ovulation
endocrine system medicine.medical_specialty media_common.quotation_subject Dinoprost Estrus Ovarian Follicle Food Animals Internal medicine Luteolysis Biopsy Follicular phase medicine Animals Small Animals Progesterone Ultrasonography media_common Estrous cycle Estradiol medicine.diagnostic_test Equine business.industry Biopsy Needle Ovary Single injection Follicle aspiration Endocrinology Cattle Female Animal Science and Zoology Follicle Stimulating Hormone Estrus Synchronization business |
| Zdroj: | Theriogenology. 55:805-821 |
| ISSN: | 0093-691X |
| DOI: | 10.1016/s0093-691x(01)00445-9 |
| Popis: | The objective of this study was to compare the effects of administration of a single injection of progesterone (P4) and follicle aspiration on Day 7 of the estrous cycle on the timing and synchrony of follicular wave emergence, time of ovulation, and concentrations of P4, estradiol and FSH in Holstein cows. Twenty cows were assigned to 4 groups (n=5 cows per group) in a 2 by 2 factorial arrangement. Cows were treated on Day 7 (Day 0 = estrus) of the estrous cycle with either sham follicular aspiration and an oil vehicle administered intramuscularly (control), aspiration of ovarian follicles (aspiration), 200 mg of P4 im, or aspiration and 200 mg of P4 im (aspiration + P4). On Day 11, PGF(2alpha)(25mg) was administered to all groups. Synchrony of ovulation was less variable in each of the treatment groups compared with the control group (P |
| Databáze: | OpenAIRE |
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