Synchronization Systems

MGA®- Select
• Maximizes total pregnancy rate
• ‘Jump starts’ many anestrous cows
• Eliminates most early heats
• Strongly recommended for 2-yr-olds and other ‘high risk’ cows
• If heat detection is not available, time A.I. & inject GnRH 72 hr. after PGF

All three of the systems below are based on the same 2-shot protocol, using GnRH and PGF 7 days apart. You as a producer must balance your desire for high pregnancy rates against your ability to provide the quantity and quality of labor necessary for heat detection. Cows bred off of detected heats will typically have higher conception rates than those that are fixed-time inseminated.

Select Synch
• Simple and easy to administer
• Induces some anestrous cows
• Relatively low cost
• Option 1--breed only those detected
• Option 2--pregnancy rates optimized with short detection period followed by mass mating

Short-Term MGA®- Select
• No ‘Early Heats’
• Induces cyclicity
• Short-term treatment
• Minimal heat detection required
• Excellent choice for late-calvers

Co-Synch
• Allows for fixed-time breeding
• No heat detection needed
• Most labor and time efficient

MGA-PGF
• Proven system for heifers
• ‘Jump starts’ many heifers
• High response rate
• Excellent conception rates
• Tight synchrony of estrus
• Time A.I. at 72 hr. after PGF if heat detection is not an option

Information provided by Select Sires

Heat detect and inseminate by estrus observation every day. (Expect 5% of females in heat per day.) If you only observe heats and breed after day day 6 (post-injection), expect to detect only about 65-75% of the cycling females in heat.

Advantages: Easy management. Low overhead cost. Works for cows and heifers