Advancements in Estrous Synchronization and Their Application

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Advancements in Estrous Synchronization and Their
Application

• John B. Hall, Ph.D.
• Extension Beef Cattle Specialist
• VA Tech

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Why Should the Beef Industry Use Estrous
Synchronization?

• Only 7-13 of cows bred AI
• Reduce the time and labor associated with AI
• Hasten resumption of cycles
• Potential for dramatic effect on product quality
  and consistency - commercial sector
• Seedstock producers can make more rapid change

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Estrous Synchronization will not.

• Replace other proper management practices
• automatically reduce or enhance fertility
• alleviate the need for careful genetic selection
• make calves genetically uniform

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Barriers to Successful Estrous Synchronization

• Poor nutrition
• Postpartum Cows
• 1st calf heifers vs. mature cows
• Long calving seasons
• Immature heifers
• Lack of commitment or understanding

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Estrous Cycle of the Cow
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Timed AI Systems
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SYNCRO - MATE B System
Nor E2
Remove implant
Breed
Implant
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7
11
0
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OVSYNCH System
GnRH
GnRH
Breed
PGF
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7
10
0
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CO-SYNCH System
GnRH
GnRH Breed
PGF
9
7
10
0
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Ovsynch vs. Syncro-Mate B
Geary et al. , 1998
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Ovsynch vs. Syncro-Mate B
Geary et al. , 1998
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Co-Synch
Hall et al., unpublished