This document summarizes different methods of estrus synchronization in cattle, including shortening or prolonging the luteal phase using hormones like progesterone, prostaglandin F2α, and GnRH. It discusses the principles and limitations of estrus synchronization, and explains common protocols like Ovsynch and CIDR-PG that involve administering these hormones at specific time intervals to induce ovulation and allow for timed artificial insemination without detection of estrus. Examples of synchronization methods for cycling and non-cycling cows are also provided.

1. THER 608
Physiology of Reproduction
Prof. Dr. Nasim Ahmad
Physiology of Estrous Cycle
Luteal Phase Chap. 9
Control of estrus cycle, (synchronization of estrus),
ovulation induction, controlled breeding
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11. • Group females for parturition
• Closely linked or integrated with AI
– Reduce calving Interval (postpartum
period)
– Pre requisite for ET (Embryo Transfer)
• Reduce time required for estrus detection
• Eliminate estrus detection with timed
insemination
WHY ESTRUS SYNCHRONIZATION?
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12. PRINCIPLES FOR ESTRUS
SYNCHRONIZATION
• Types of approaches
– Shortening the luteal phase
– Prolonging the luteal phase
•Limitations
•What will you do when there is no Luteal Phase?
• Types of animals
– Cycling cows (With CL)
– Non cycling cows (With No CL)
• Types of breeding managment
– AIDE (Artificial Insemination on Detected Estrus)
– TAI (Timed Artificial Insemination)
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13. HORMONES USED FOR ESTRUS
SYNCHRONIZATION
•Progesterone
– egg., Control Internal Drug Release (CIDR)
1.38 g of P4
• Prostaglandin F2α
– 25 mg Dinoprost
– 500µg Clopostrenol
•GnRH 100µg
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14. Normal Cycle
Day 0-6 No Effect
Day 6-17 cow in
heat in 3 days
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15. METHODS FOR PROGESTERONE
ADMINISTRATION
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17. GnRH – PG Protocols
Ovsynch
GnRH PG GnRH AI
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1 7 9 16-24 h
Treatment days
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18. CIDR PG Remove Heat Detect & AI
CIDR
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1 6 7 8-10
Treatment days
3
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19. CIDR
CONTROLLED INTERNAL
DRUG RELEASE
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21. APPLICATION OF
CIDR
IN BUFFALOES
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