Estrus Detection in Dairy Cattle

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Estrus Detection in Dairy Cattle

• Composed By
• Buffy Sacia
• Matthew Repinski
• Erich Roush
• Liana Wiegel

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Estrus Synchronizationin Dairy Cattle

• Case 1 Background Info
• Services and expertise have been requested on a
  900 cow dairy herd in East Timbucktoo
• Current market is designed for higher fall milk
  prices and it is now November
• Labor shortage for additional or new protocols
  dealing with heat detection
• DO NOT wish to use cleanup bull
• Regional lack of CIDR availability
• Progestins are not approved for use in lactating
  dairy cattle
• Current management/protocols for breeding and
  parturition were not specified

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Estrus Synchronizationin Dairy Cattle
Figure cited from Whats New in Estrus
Synchronization? By Mel Dejarnette
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Estrus Synchronizationin Dairy Cattle

• Drug Name GnRH
• Target Cells Involved in Response Anterior
  Pituitary
• Cellular Response 2nd Messenger System Drug
  Action Calcium (Ca)
• Feedback/Effect of Drug LH FSH Release

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Estrus Synchronizationin Dairy Cattle

• Drug Name PGF2a
• Target Cells Involved in Response Corpus Luteum
  Luteal Cells
• Cellular Response 2nd Messenger System Drug
  Action Calcium
• Feedback/Effect of Drug Luteolysis

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Estrus Synchronizationin Dairy Cattle

• Drug Name ECP
• Target Cells Involved in Response Nuclear
  Receptors within Hypothalamus
• Cellular Response Steroid Hormone Mechanism
• Feedback/Effect of Drug Positive () Feedback on
  GnRH, thus causing LH Surge

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Potential Problems with Animal Reproductive State

• Anestrous
• Ovulation Not responsive to GnRH
• PGF2a to be ineffective due to lack of CL

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Suggestions/Recommendations

• Continue regular herd health/pregnancy checks
• If pregnancy rate increases implementation of
  protocols is working
• Allocate one employee to specifically manage
  reproductive responsibilities
• Additional labor may be required to manage
  parturition during high parturition periods to
  perform protocols and procedures (Colostrum
  mngmnt., delivery newborn calf, fresh cow
  protocols)