Effect of some hormones on reproductive performance and some serum biochemical changes in synchronized black goats

In randomized block design, 58 indigenous black mountain goats were examined for the effect of different hormonal treatments in inducing oestrus on selected biochemical characteristics of blood serum that were (aspartate transaminase, AST. Alanine transaminase ALT, Akaline phosphatase, ALP, total protein, albumin and total cholesterol). The animals were randomly assigned into four groups according to their treatment. The control group (C) consisted of 10 females whereas the rest of the groups, each consisted of 12 females. The treatments included a double PGF 2 (Dinoprost tromethamine) intramuscular injection (5 mg) at a time interval of 11 days plus an intramuscular injection of pregnant mare serum (PMSG) (400I. Uand 600I. U.) two days before second injection for (treatments, TI, T2) respectively. Treatment (T3) was as that of T1 except PMSG was not injected. T4 was treated as T3 plus an intramuscular injection of gonadotropin releasing hormone (GnRH) (12. 5µg) after 24 hours of second injection of PGF 2 was added. The results indicated that oestrus was higher (P<0.05) in all treatment groups (100%, 91%, 100%, 100%) respectively than that of control group (70%). There was a significant effect (P<0.05) of hormonal treatment on kidding rate in which the ratio were (116%, 115%, 75% and 83%) for treatment groups respectively in comparison with 70% for control group, also there was significant effect (P<0.05) of hormonal treatment on litter size in (T3). There were significant increases in activity of AST, ALT, during late pregnancy and the first week of parturition, whereas the activity of ALP enzyme was increased during early pregnancy. The concentration of total protein, total cholesterol and albumin were increased (P<0.05) during late stage of pregnancy and then decreased during the first week after parturition. It was concluded that administrating of PGF 2 to does on this synchronization regimen in the natural breeding season is desirable.