Resynchronizing estrus with progesterone or progesterone plus estrogen in cows of unknown pregnancy status

Journal of Dairy Science
S Z El-Zarkouny, J L Stevenson

Abstract

Two experiments were conducted to test 2 progesterone (P4)-based treatments that were applied to lactating dairy cattle of unknown pregnancy status to resynchronize estrus of nonpregnant cows. In experiment 1, cows were assigned randomly before a timed AI (TAI) to 1) treatment with a CIDR (controlled internal drug-releasing intravaginal insert containing P4) for 7 d starting on d 13 after TAI (CIDR; n = 300) or 2) no P4 treatment (control; n = 330). Compared with controls, P4 increased the synchrony of those detected in estrus, but failed to increase the overall return rates of non-pregnant cows during the 6 d after CIDR removal (27% vs. 31%; d 20 to 26 after TAI) and did not alter synchronized conception rates (32% vs. 20%) of those inseminated. Use of P4 did not compromise pregnancies resulting from TAI compared with controls (38% vs. 42%), but increased embryo survival between d 29 and 57 after TAI (65.5% vs. 44.3%). In experiment 2, on d 13 after TAI, 196 cows were treated with a CIDR insert for 7 d. Controls received no further treatment. Remaining cows were treated with 1 of 3 estrogen regimens: 1 mg of estradiol benzoate (EB), 0.5 mg of estradiol cypionate (ECP), or 1 mg of ECP on both d 13 and 21. Only 60% of nonpregnan...Continue Reading

References

Apr 1, 1986·Journal of Dairy Science·R A DaileyS P Washburn
Mar 1, 1985·Journal of Reproduction and Fertility·R K Munro, N W Moore
May 1, 1980·Journal of Reproduction and Fertility·G J KingH A Robertson
May 1, 1995·Biology of Reproduction·N AhmadE K Inskeep
Dec 1, 1995·Journal of Animal Science·D P RyanK J O'Farrell
May 15, 2002·Journal of Animal Science·D H TownsonJ L Pate
Dec 10, 2003·Theriogenology·Scott McDougall, Scott H Loeffler
Nov 1, 1995·Theriogenology·J R PursleyM C Wiltbank

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Citations

Jul 16, 2010·The Journal of Reproduction and Development·Keith L Macmillan
Jul 26, 2005·Theriogenology·M G ColazoR J Mapletoft
Jan 28, 2010·The Journal of Reproduction and Development·Su T LongMasaaki Okakoi
Sep 16, 2014·Reproduction in Domestic Animals = Zuchthygiene·M Saint-DizierS Chastant-Maillard

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