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Impact of Sexed Semen on Holstein Reproduction Factors in the USA: A Study

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  1. X X X Effect of sexed-semen use on Holstein conception rate, calf gender, dystocia, and stillbirth in the United States Abstr. 4183

  2. Traits • Conception rate • Calf gender • Male, female, single, twins • Dystocia • Births reported as requiring considerable force or extremely difficult • Stillbirth • Born dead or died within 48 hours

  3. Data • Holstein breedings from January 2006 through December 2008:

  4. Extent of sexed-semen use

  5. Sexed-semen breedings (%) by service number

  6. Sexed-semen breedings (%) by service number

  7. Conception rate (%) by service number

  8. Conception rate (%) by service number

  9. Calf gender (%)

  10. Dystocia incidence (%) *Different superscripts represent statistical differences within column (P < 0.05)

  11. Stillbirth incidence (%) *Different superscripts represent statistical differences within column (P < 0.05)

  12. Conclusions • Increased use of sexed semen since 2006 when it became commercially available • Primarily used for breeding heifers and first services of cows when conception rates are traditionally higher • Mean conception rate with sexed semen lower than that with conventional semen by about 25% for heifers and 13% for cows

  13. Conclusions (cont.) • 90% heifer calves when using sexed semen • No increase in incidence of dystocia with sexed semen, a reduction for twins • Slight increase in stillbirths for single male calves born to heifers when sexed semen was used

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