Influence of small doses of gonadotropin-releasing hormone following controlled internal drug-release insert removal on reproductive parameters in beef cattle subjected to a fixed-time artificial insemination protocol
| Autor: | Emmalee J. Northrop, Stephanie D. Perkins, Jerica J.J. Rich, George A. Perry |
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| Rok vydání: | 2018 |
| Předmět: |
Estrous cycle
endocrine system Pregnancy Artificial insemination medicine.medical_treatment Gonadotropin-releasing hormone Biology Beef cattle medicine.disease Insert (molecular biology) Animal science Controlled internal drug release medicine Animal Science and Zoology hormones hormone substitutes and hormone antagonists Food Science Hormone |
| Zdroj: | The Professional Animal Scientist. 34:566-570 |
| ISSN: | 1080-7446 |
| DOI: | 10.15232/pas.2018-01787 |
| Popis: | Heifers and cows that exhibit estrus before fixed-time AI have increased concentrations of estradiol and greater conception rates compared with those that do not. Our objective was to determine whether small doses of gonadotropin-releasing hormone following controlled internal drug-release insert removal would affect estradiol concentrations, estrus expression, or pregnancy success. Beef cattle (n = 247) were synchronized using the 7-d CO-Synch+CIDR protocol and assigned to 1 of 3 treatment groups (0 μg,10 μg, or 5 + 5 μg of gonadotropin-releasing hormone). Animals were observed for estrus, blood samples were collected, and animals were bred by appointment. Concentrations of estradiol were influenced by time (P |
| Databáze: | OpenAIRE |
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