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The objective was to compare pregnancy rates to resynchronization and timed AI (TAI) protocols in lactating dairy cows that received GnRH at 23 d and were diagnosed not pregnant at 30 d after the pre-enrollment AI. Nonpregnant cows (624) at ultrasonography on day 30 (study day 0) were classified as ...

Bartolome, J. A.; Sozzi, A.; McHale, J.; Swift, K.; Kelbert, D.; Archbald, L. F.; Thatcher, W. W.
Elsevier, New York, USA
Theriogenology, 2005, 63, 6, pp 1643-1658