Effects of timed artificial insemination following estrus synchronization in postpartum beef cattle
The objectives of this study were to evaluate estrus response and pregnancy rates resulting from timed artificial insemination (AI) following estrus synchronization using CIDR in postpartum beef cattle.
Thus, the objectives of this study were to evaluate estrus response and pregnancy rates resulting from timed AI at 48-50 h, 53-55 h and 58-60 h following estrus synchronization using CIDR in postpartum beef cattle.
Estrus synchronization was carried out using a CIDR protocol (Pfizer, Animal Health, New Zealand) containing 1.38 mg progesterone.
intramuscularly during the day of CIDR insertion (day 0)
Estrus observation
The cows were observed discontinuously in the paddocks for onset, duration and behavioral patterns of estrus every 6 h for 66 h following CIDR removal.
Cows receptive to at least 3 mounts were considered
One of the strategies for improving pregnancy rates in the modern beef industry is by utilizing a synchronization program.