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Why do we want twins or triplets in sheep, but not in cows or horses?

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Why do we want twins or triplets in sheep, but not in cows or horses?

  1. 1. Why do we want twins ortriplets in sheep, but not in cows or horses?
  2. 2. Why do we want twinsor triplets in sheep, butnot in cows or horses?
  3. 3. Horses• Twinning causes . . . – high frequency of abortions – birthing complications• Uterus is too small to support growth of two fetuses together• In rare cases, both fetuses survive
  4. 4. Cows• Twinning can result in . . . – retained placentae – decrease in reproductive efficiency – decrease in milk production – Smaller calves with lower growth rates 50% of all double ovulations in cattle result in bull/heifer combinations and 92% of these will result in a freemartin…
  5. 5. Freemartins• An “androgenized” heifer born twin to a bull• Result when fetal blood mixes • Sterile females are unwanted in livestock production
  6. 6. Sheep• Twinning is a good way to get more for your money • Capable of giving birth to healthy twins • Insignificant occurrence of freemartins in sheep
  7. 7. Another question is raised . . .• Why is the incidence of freemartins so much higher in cattle than in sheep? Yu m
  8. 8. Why do we want twins ortriplets in sheep, but not in cows or horses?
  9. 9. Why do we want twinsor triplets in sheep, butnot in cows or horses?
  10. 10. Horses• Twinning causes . . . – high frequency of abortions – birthing complications• Uterus is too small to support growth of two fetuses together• In rare cases, both fetuses survive
  11. 11. Cows• Twinning can result in . . . – retained placentae – decrease in reproductive efficiency – decrease in milk production – Smaller calves with lower growth rates 50% of all double ovulations in cattle result in bull/heifer combinations and 92% of these will result in a freemartin…
  12. 12. Freemartins• An “androgenized” heifer born twin to a bull• Result when fetal blood mixes • Sterile females are unwanted in livestock production
  13. 13. Sheep• Twinning is a good way to get more for your money • Capable of giving birth to healthy twins • Insignificant occurrence of freemartins in sheep
  14. 14. Another question is raised . . .• Why is the incidence of freemartins so much higher in cattle than in sheep? Yu m

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