Effect of parity and milk production on conception rate after two synchronization protocols in dairy cows

الملخص EN

Our objective in this study the effect of parity and average milk production on the conception rate after resynchronization with G6G protocol or Ovsynch protocol.

Lactating Holstein cows (n = 100) divided into two groups (Ovsynch and G6G) cows in this group1 (n = 50) were received the following treatment sequence, 12 μg Buserelin on day zero, 500 μg IM of Cloprostenol on day seven, 12 μg Buserelin IM on day nine and received timed artificial insemination (TAI) 16 hours later.

Group II (G6G): were received 500 μg IM Cloprostenol on day zero, 12 μg Buserelin on day two and six days later these cows received the Ovsynch as previously explained in the first group.

Conception rate was (40 vs.

30 %) for G6G and Ovsynch protocol respectively primiparous cows, conception rate to G6G program was 46.15%, compared to 28.57% in cows synchronized with Ovsynch program.

In Multiparous cows, the similar trend was observed but the difference was smaller (conception rate 37.8 vs.

30.55% in cows synchronized with G6G and with Ovsynch, respectively).

In high producers, conception rate was numerically higher in the Ovsynch group (40%) compared to the G6G group (36%).

While, in low producers, conception rate to G6G protocol (48%) tended (P = 0.07) to be higher than that to Ovsynch protocol (20%) in conclusion Administration of PGF2α 8 d before initiation of Ovsynch increase the conception rate compared with the standard Ovsynch protocol in primiparous cows than in multiparous cows and in low producers than high producer cows