İvesi koyunlarında eksogen hormon kullanarak kızgınlık denetimi ve döl verimini artırma olanakları
Özet
This study was carried out in 401 Awasi ewes(2. 5-4.5 years old) to increase fertility and synchronize oestrous by using progestagen pessaries (60 mg MAP ; Upjohn) and varying dose levels of PMSG (200-400-600 I.U. Intervet) during breeding season under Central Anatolian conditions. The oestrous rates in all of the treated groups(n=205) were 63.41%,94.15% and 97.5% after 24,48,60 hours of PMSG, respectively. Hand mating was performed 48. and 60. hours after PMSG application,injection.Lambing was cotnplated with in 9 days at the ratio of 92.08% in treatment groups and within 30 days at the ratio of 97.45% in control group.The fertility and multiple birth rates were found 98.54%,50.00% in treatment groups and 97.45%,23.04% in control groups, respectively.Multiple birth differences were significant between treated and control groups (P<0.05).Prolificacy in treated groups (200-400-600 I.U. PMSG) were 146.25%, 155.38% 161.40% respectively, in control group, was 123.04% (P<0.05). The multiple birth was not affected significantly by the age of ewes.Birth weight differences between treatment groups and control group were significant (P<0.05) where as differences between weaning weights of groups were non significant. Progestagen low dose of PMSG treatment syncronized oestrous effectively and increased prolificacy.KEY WORDS: Progestagen, PMSG, Awassi ewes