Influence of single-sire and multiple-sire natural mating on pregnancy rate of beef heifers.

@article{Lunstra1982InfluenceOS,
  title={Influence of single-sire and multiple-sire natural mating on pregnancy rate of beef heifers.},
  author={Donald D. Lunstra and D. B. Laster},
  journal={Theriogenology},
  year={1982},
  volume={18 4},
  pages={
          373-82
        }
}
Twelve mature Angus bulls possessing similar semen quality were used to study the effects of single and multiple services and single-sire and multiple-sire mating on pregnancy rate of beef heifers. Heifers were observed for natural estrus twice daily and mated within 6 hr of onset of estrus. Pregnancy rate was determined by rectal palpation at 60 days post-mating. Pregnancy rate of heifers receiving one service per estrus averaged 62.1% (n=124) and pregnancy rate of heifers receiving multiple… CONTINUE READING

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