Extending Interval from Seventeen to Nineteen Days in the Melengestrol Acetate - Prostaglandin Estrous Synchronization Program for Heifers11Published as paper number 13006, Journal Series, Nebraska Agricultural Research Division, University of Nebraska, Lincoln, NE 68583-0908
| Autor: | Gene H. Deutscher |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Estrous cycle
endocrine system medicine.medical_specialty Pregnancy animal structures animal diseases media_common.quotation_subject Prostaglandin Estrus synchronization Luteal phase Biology medicine.disease Melengestrol acetate chemistry.chemical_compound Animal science Endocrinology chemistry Internal medicine medicine Animal Science and Zoology Reproduction Injection given hormones hormone substitutes and hormone antagonists Food Science media_common |
| Zdroj: | The Professional Animal Scientist. 16:164-168 |
| ISSN: | 1080-7446 |
| DOI: | 10.15232/s1080-7446(15)31687-9 |
| Popis: | Two experiments were conducted to determine whether extending the interval between removal of melengestrol acetate (MGA) from feed and injection of prostaglandin F2α (PGF) from 17 to 19 d would affect synchronization of estrus, conception, and pregnancy rates of beef heifers. In both experiments, heifers were fed MGA for 14 d, and PGF was given at either 17 or 19 d after cessation of MGA feeding. Heifers were observed for estrus and artificially inseminated for 5 d after PGF injection. In Exp. 1, 240 yearling heifers were randomly assigned to either a 17- or a 19-d treatment group according to estrous status and day of the estrous cycle. In Exp. 2, 1409 yearling heifers on a cooperating ranch were randomly assigned to the same two treatment groups without knowledge of estrous status. The PGF injection at 19 d (Exp. 1) caused a higher (P |
| Databáze: | OpenAIRE |
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