Inducing ovulation early postpartum influences uterine health and fertility in dairy cows
- Bittar, J. H. J.
- Pinedo, P. J.
- Risco, C. A.
- Santos, J. E. P.
- Thatcher, W. W.
- Hencken, K. E.
- Croyle, S.
- Gobikrushanth, M.
- Barbosa, C. C.
- Vieira-Neto, A.
- Galvao, K. N.
DOIAbstract
The objective of the current study was to evaluate the effect of GnRH early postpartum on induction of ovulation, uterine health, and fertility in dairy cows. Holstein cows without a corpus luteum (CL) at 17 +/- 3 DIM were assigned randomly to receive i.m. GnRH (n = 245) at 17 +/- 3 and 20 +/- 3 DIM or remain as controls (n = 245). Ovaries were scanned by ultrasonography twice weekly totaling 4 examinations. Ovulation was characterized by the appearance of a CL >= 20 mm at any ultrasound or CL <20 mm in 2 consecutive examinations. Clinical and cytological endometritis were diagnosed at 35 DIM. Compared with control, GnRH increased ovulation up to 3.5 d after the last treatment (78.7 vs. 45.0%) and did not affect the prevalence of clinical e...
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