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Abstr. 4183

X. X. X. Effect of sexed-semen use on Holstein conception rate, calf gender, dystocia, and stillbirth in the United States. Abstr. 4183. Traits. Conception rate Calf gender Male, female, single, twins Dystocia Births reported as requiring considerable force or extremely difficult

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Abstr. 4183

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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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