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Estrous Synchronization

Estrous Synchronization - 48 Using only the ovasynch method...

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Kelley Benham ADS 4611 2-7-08 Estrous Synchronization I would use the pre-synch (timed artificial insemination) method for estrous synchronization. The hormones needed for this method are PGF2a, and GnRH. Studies show that using the pre-sync method instead of just the ovasynch method increased pregnancy rates up to 10%. In this protocol, an injection of PGF2a is given on day 0, on day 14 an injection of GnRH is given, on day 21 another injection of PGF2a, and on day 23 another injection of GnRH in given. Between 8-18 hours after the last GnRH injection, artificial insemination is done. Pre-synch protocol has proven to be very effective. Pregnancy rates are between 43%-
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Unformatted text preview: 48%. Using only the ovasynch method, pregnancy rates are only between 29%-38%. With no estrous synchronization, pregnancy rates have been reported at 12%-16%. The cost of the pre-synch protocol is about $6 per cow including labor. The cost of a cow not being pregnant is around $2.50, per cow, per day. Using the pre-synch protocol can save producers valuable money and time. Reference Kelley Benham ADS 4611 2-7-08 http://www.northstarcooperative.com/NSC/The_Point/nov_word_2003/pre_synch_improves_c onception.htm...
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