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Norgestomet and gonadotropin-releasing hormone enhance corpus luteum function and fertility of postpartum suckled beef cows.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Troxel, Tom R. Cruz, Libertado C. Ott, Randall S. Kesler, Darrel J. |
| Copyright Year | 1993 |
| Abstract | In Exp. 1,101 suckled beef cows were administered two injections of prostaglandin F2 alpha (PGF2 alpha) 11 d apart. Cows in Group 1 received no additional treatment. Cows in Groups 2 and 3 received 250 micrograms of GnRH plus 47-h calf removal. Cows in Group 3 also received a norgestomet ear implant that was inserted 4 d after the first PGF2 alpha injection and left in situ for 8 d. The second PGF2 alpha injection was administered approximately 28 h before the time of norgestomet implant removal. The GnRH was administered approximately 30 h after the time of norgestomet implant removal (or 58 h after the second PGF2 alpha injection). Calf removal was the period from the time of implant removal to AI. All cows were artificially inseminated once 75 h after the second PGF2 alpha injection (47 h after implant removal). Reproductive status before the time of GnRH treatment (presynchronization) was determined by multiple sampling (2, 13, and 23 d before GnRH treatment) for blood progesterone concentrations (62% anestrous and 38% cyclic). The GnRH treatment increased (P < .01) the ovulation response and norgestomet reduced (P < .01) the incidence of short luteal phases in the presynchronization anestrous cows. Norgestomet treatment increased (P < .05) the timed breeding pregnancy rates for both presynchronization anestrous and cyclic cows. In Exp. 2, 174 suckled beef cows were administered Syncro-Mate B (which includes norgestomet). Cows in Group 1 received no additional treatment, whereas cows in Group 2 received 250 micrograms of GnRH (30 h after norgestomet implant removal).(ABSTRACT TRUNCATED AT 250 WORDS) |
| Starting Page | 1090 |
| Ending Page | 1092 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.animalsciencepublications.org/publications/jas/pdfs/71/10/2579 |
| PubMed reference number | 8226355v1 |
| Volume Number | 71 |
| Issue Number | 10 |
| Journal | Journal of animal science |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Body of uterus Breeding Dinoprost Fertility Gonadorelin Pregnancy Rate Progesterone Prostaglandins Removal of implant (procedure) Structure of corpus luteum of ovary norgestomet |
| Content Type | Text |
| Resource Type | Article |
