Photoperiod length and the estrus synchronization protocol used before AI affect the twin pregnancy rate in dairy cattle.

@article{AndreuVzquez2012PhotoperiodLA,
  title={Photoperiod length and the estrus synchronization protocol used before AI affect the twin pregnancy rate in dairy cattle.},
  author={Cristina Andreu-V{\'a}zquez and Irina Garc{\'i}a-Ispierto and Fernando L{\'o}pez-Gatius},
  journal={Theriogenology},
  year={2012},
  volume={78 6},
  pages={1209-16}
}
This study addresses potential management risk factors affecting the incidence of twin pregnancies in high-producing dairy cows. Special attention was paid to the estrus synchronization protocol used before the AI resulting in pregnancy. Possible factors affecting the twin pregnancy rate were analyzed through binary logistic regression procedures on 2015 pregnant cows from July 2010 to July 2011. Twin pregnancy was recorded in 361 of the 2015 pregnancy diagnoses made (17.9%). Twin pregnancy… CONTINUE READING
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