Study of affection being or not being of vacuole in corpus luteum to the level of serum progesterone and evaluation of ovarian activity in goat

There are afew studies about hormonal event and reproductive physiology of goat specifically about of existance vacuole in corpus luteum in Iran. Therefore, this study was under taken to compare the level of progesterone in vacuolated C. L. goot and unvacuolated C. L. goot، assessment of ovalatiom in right and left ovarys and so determine rate of double ovalation at abattoir of Ahwaz, over the breeding season. 86 mature female goats selected and the inspection of goats were done before the slaughter. Blood samples were collected from jugular vein and serum progesterone concentration were measured by RIA method. The genital tracts were examined visually, detail of the corpus luteums of ovary were recorded. Results showed that 19. 76% (n=17) of goats had one vacuolated corpus lutum. In 86 goats of research 55. 4% (n=48) of goats had one corpus luteum, 30. 23% (n=26) of goats had tow corpus luteum and 14% (n=12) of goats without corpus luteum. Statistical Analysis of data were done by used of T-test and Proportion-test methods in SPSS software. the mean (±SD) level of progesterone in vacuolated C. L. goats was 1. 99± 0/42ng/ml and in unvacuolated C. L. goats was 2. 15 ± 0/31ng/ml. although the level of progesterone in unvacuolated C. L. goats was higher than the vacuolated C. L. goats, but this difference wasnt significant (P>0. 05). In 74 goats with corpus luteum, there were 49 (66. 2%) corpus luteum on Right ovary and 37 (50%) corpus luteum on left ovary. Results indicated that the percent of active right ovarys was significantly more than the active left ovarys (P<0. 05). Double Ovalation rate of goats 30. 23% was determined in this study. Finally, it appears that the existence of vacuolated C. L. in goat is a physiologic phenomenon to reasons the high frequency rate and equal level of progesterone than the unvacuolated (natural) C. L.