The present study was performed to determine the effect of PGF2α and GnRH injections in different time intervals on
fertility in Hair goats during breeding season. Totally, 80 primiparous Hair goats were divided into four groups (n=20 in
each) according to the body condition scores of the animals. The animals in groups were treated as follows; first group
(Ovsynch), GnRH on day 0, PGF2α on day 7 and GnRH on day 9; second group (2PG-G), PGF2α on day 0, PGF2α on day
7 and GnRH on day 9; third group (PG-G), PGF2α on day 7 and GnRH on day 9; fourth group (G), GnRH on day 9.
Bucks were included into the groups on day 10-14 and insemination was performed during standing heat. Blood samples
were collected to determine possible embryonic losses on day 21 for further analysis of serum progesterone
concentrations. Transabdominal ultrasonography was performed to detect pregnancy on day 40-45. It was determined
that in Ovsynch, 2PG-G, PG-G and G groups, estrous rate was 100%, 95%, 95% and 85%; pregnancy rate was 85%,
95%, 95% and 85%; kidding rate was 100%, 78.9%, 94.7% and 88.2%; twinning rate was 41.2%, 40%, 22.2%, 20%;
litter size was 1.41, 1.40, 1.22, 1.20, respectively. However, these parameters did not show any significant difference
between groups (P> 0.05). In conclusion, it is suggested that all treatment procedures may be used for estrous
synchronization in Hair goats during breeding season due to the satisfactory results