The aim of this research was to determine if there are differences in sexual
reaction of the grown sheep II de frans breed depending on the body weight of
treated eves during induction and synchronization of estrus with
fluorogestonacetate (FGA) + PMSG in anoestrus season. Total number of 262
eves was treated and they were divided in to three groups. The first group
consisted of the sheep whose body weight was from 40 to 50kg, the second
group of the sheep whose weight was from 50-60kg and the third group of the
sheep whose weight was above 60kg. Each group received sponges of FGA. After
removal of the sponges all sheep received intramuscular injection of 500 i.u
of PMSG. The "Sugonal" prepared by Veterinary institute Subotica was used.
After two days the insemination was conducted. The results show that from
first group 43.78% sheep lambed, from second group 46.66% and from third
group 59.32%. Average sheep fertility after treatments was for the first
group 113.28%, 118.37% for the second group and 137.14% for the third group.
The ratio of singles, twins and triplets was for the first group 72:28:0 %,
for the second group 70.69:24.14:5.17%, and for the third group
47.92:45.83:6.25%. Determined differences between number of lambed sheep and
treated sheep, fertility and number of twins, as well as between
investigated groups were statistically significant (P<0,05). Conclusion is
that sheep of body weight above 60kg have had significantly better reaction
to the treatment.
Sheep fertility during induction and estrus synchronisation in the anoestrus season depending of the body weight of tested eves