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Abstract

This study examined the influence of a GnRH agonist containing either 450 or 750 µg of deslorelin in an implant form or a gonadorelin injection (control) to induce ovulation in the Ovsynch protocol on pregnancy rates (PR), embryonic loss, and ovarian function in 593 lactating Holstein cows. Cows...

Author(s)
Santos, J. E. P.; Bartolome, J. A.; Cerri, R. L. A.; Juchem, S. O.; Hernandez, O.; Trigg, T.; Thatcher, W. W.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2004, 61, 2/3, pp 421-435
Abstract

The objective of this study was to determine the effect of GnRH (100 µg i.m.) treatment 5 and 15 days after timed insemination (TAI) on pregnancy rate and pregnancy loss in lactating dairy cows subjected to synchronization of ovulation. The study included 831 lactating dairy cows subjected to a...

Author(s)
Bartolome, J. A.; Melendez, P.; Kelbert, D.; Swift, K.; McHale, J.; Hernandez, J.; Silvestre, F.; Risco, C. A.; Arteche, A. C. M.; Thatcher, W. W.; Archbald, L. F.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 4, pp 1026-1037
Abstract

A reduced interval between artificial inseminations (AIs) is crucial to maintain high reproductive efficiency. Detection of estrus after insemination is the most common, rapid, and low-cost practice to re-artificially inseminate lactating dairy cows. An intravaginal progesterone device with or...

Author(s)
Bartolome, J. A.; Thatcher, W. W.
Publisher
John Wiley & Sons, Chichester, UK
Citation
Dairy production medicine, 2011, pp 117-122