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Pregnancy rates were compared in lactating dairy cows (n=1083) assigned to protocols for resynchronization of ovulation based on stages of the estrous cycle, or presence of ovarian cysts or anestrus. Cows were detected not pregnant by ultrasonography 30 d after a previous AI (study day 0) and...

Bartolome, J. A.; Sozzi, A.; McHale, J.; Melendez, P.; Arteche, A. C. M.; Silvestre, F. T.; Kelbert, D.; Swift, K.; Archbald, L. F.; Thatcher, W. W.
Elsevier, New York, USA
Theriogenology, 2005, 63, 6, pp 1628-1642