Factors associated with fertility outcomes in cows treated with protocols to synchronize estrus and ovulation in seasonal-calving, pasture-based dairy production systems.

@article{Herlihy2013FactorsAW,
  title={Factors associated with fertility outcomes in cows treated with protocols to synchronize estrus and ovulation in seasonal-calving, pasture-based dairy production systems.},
  author={Maruice Herlihy and Mark A Crowe and Donagh P Berry and Michael G. Diskin and Stephen T. Butler},
  journal={Journal of dairy science},
  year={2013},
  volume={96 3},
  pages={
          1485-98
        }
}
Logistic regression was used to identify factors associated with fertility outcomes in cows treated with protocols to synchronize estrus and ovulation. Lactating dairy cows (n=1,538) were enrolled in a completely randomized block design study to evaluate synchronization treatments. Within each herd (n=8), cows were divided into 3 calving groups: early [≥ 42 d in milk (DIM) at mating start date (MSD); n=1,244], mid (21 to 41 DIM at MSD; n=179), and late (0 to 20 DIM at MSD; n=115), based on DIM… CONTINUE READING
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