Comparative Study On The Breeding Rate In Artificial Inseminated Blue Fox Under The Influence Of LRH-3,HCG,PMSG

This experiment was focusing on the low breeding rate and small litter size in artificial bred blue fox .By comparing the influence of LRH-3 ,HCG&PMSG,achieved in finding optimum hormone and their optimum combination.The experiment involves 8 groups of animals,7 testing groups and a control group. For group I ,II & III,LRH-3,HCG or PMSG was injected to each group respectively when first mating. Group I & III which LRH-3 & PMSG was respectively injected obtained significant progress in breeding rate and litter size prior to the group II. The breeding rate was 10% and 8.5% over the control group(65%) and litter size extended by 1. 1 and 1. 7 respectively over the control group(6. 1).Group II injected with HCG obtained 10% breeding rate below the control group and litter size was not significantly different. In group IV & V,PMSG and LRH-3+HCG were injected respectively when first and second mating. The group treated with PMSG+LRH-3 obtained 81.8% breeding rate,6. 8% higher than control group. In group treated with PMSG+HCG ,there were no difference breeding rate and 0.8 more in litter size than that of control group. This indicates that the premium hormone combination for improving Blue Fox s breeding rate is PMSG+LRH-3.In group VI,hormone HCG was injected for 2 times. In group Vfl,hormone LRH-3 was injected 2 times,aiming for comparation with group I &II. The results showed breeding rate in group Vfl was 82. 4%,respectively 17. 4% and 7. 4% more than those in control group and group I .The litter size of this group was 7.5 cubs,1.4 more than control group. It indicats that twice injections of HCG can improve the breeding rate by 14. 2%. this indicated that ,twice injection of HCG or LRH-3 was effective to improve the breeding rate of female foxes,of which LRH-3 injections was prior over HCG. In the experiment ,the hormonal treatment did not change the pregnancy period. HCG injection also used for 4 male foxes which exhibited difficulties in semen collection. Higher semen quality was obtained after treatment. It suggest that HCG works effectively in stimulating the sexual-gland developmend,semen generation and seualty.