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Agricultural News

2021 Beef Synchronization Protocols and Tips

Mon, 08 Mar 2021 09:08:57 CST

2021 Beef Synchronization Protocols and Tips In the latest issue of simmental.org Jackie Atkins, Ph.D gives Beef Synchronization Protocols and Tips

The Beef Reproduction Task Force, comprised of research scientists, allied industry, and veterinarians, provides beef cattle producers the best background reproductive information and fully vetted tips and estrus synchronization protocols to ensure clear and current information is readily available. Each year this group puts together the most reliable estrus synchronization protocols for use by the industry (see the following pages). But this resource doesn’t stop there. Head to beefrepro.org to learn more about the estrus cycle of a cow, tips for using sexed semen, attend webinars, or watch previous presentations. If you have questions on how to set your herd up for success in reproduction, this group likely has your answers.

Checklist for a Successful Estrus Synchronization and AI program

Herd Management

Pregnancy rate after 60 days > 90% mature cows, > 85% first calf heifers
Body condition at calving ? 5 cows, 5.5-6 first-calf heifers
Body condition at breeding ? 5 cows, 5.5 – 6 first-calf heifers, 5-6 yearling heifers (fatter is not better)
Majority of herd > 40 days postpartum at start of breeding, 20 days postpartum earliest time to insert CIDR in 5 to 7 day CIDR protocols
Steady to the increasing plane of nutrition before and during the breeding season
Nutrient analysis of forages used to balance rations
Scale used to monitor body weight
If grazing, appropriate stocking rate for available forage
Dry feed/forage available when grazing lush forages
Appropriate mineral supplementation for water and feed resources
No modified live vaccinations < 30 days before breeding (45-60 days better)
Functional facilities for sorting, treatment administration, and AI
Skilled labor that minimizes handling stress
Transportation and nutritional stress minimized day 5 to 45 post breeding
Complete and accurate records to assist with troubleshooting


Synchronization system implemented according to Beef Reproduction
Task Force recommendations as shown on pages 44 and 45.
GnRH and PG products administered using correct dose, proper technique, day, and time
Uniform daily MGA consumption
Dedicate sufficient time and skill to heat detection when used

Breeding soundness exam performed before semen collection
Semen received from CSS certified lab
Minimal and correct semen handling at all times
Straws not above frost line more than 8 seconds during handling
Semen inventory system in place
The appropriate type of sheaths on hand for AI gun
Clean AI gun, scissors, thaw unit, and other equipment
Use clean thaw water, temperature monitored (94-98 F)
Thaw semen according to provider’s instructions or not less than 45 seconds and not more than 10 to 15 minutes
Avoid temperature shock and exposure to UV rays when moving straws from the liquid nitrogen tank to the cow



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