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Abstract

The objectives were to determine whether rates of conception, ovulation, presynchronization, or follicle and CL characteristics were altered after modifying the Double-Ovsynch (DO) protocol to include hCG compared with the DO protocol. Primiparous and multiparous lactating dairy cows (N=183), and...

Author(s)
Binversie, J. A.; Pfeiffer, K. E.; Larson, J. E.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 78, 9, pp 2095-2104
Abstract

We determined the effects of hCG on ovarian response, concentration of progesterone, and fertility in a fixed-time AI (TAI) protocol. Four hundred forty-four crossbred beef heifers were synchronized with the CO-Synch+CIDR (controlled internal drug-releasing insert) protocol. In addition, heifers...

Author(s)
Dahlen, C. R.; Marquezini, G. H. L.; Larson, J. E.; Lamb, G. C.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2011, 89, 9, pp 2750-2758