Paper Information

Journal:   ARCHIVES OF RAZI INSTITUTE   December 2003 , Volume - , Number 56; Page(s) 81 To 92.
 
Paper: 

PLASMA ESTRADIOL - 17 Β AND PROGESTERONE DURING ESTROUS CYCLE IN CASPIAN MARES

 
 
Author(s):  SHIRAZI A.*, GHARAHGOUZLOU FARAMARZ, NIASARI NASLAJI A., BOLOURCHI M.
 
* Clinical Sciences Dept., Faculty of Veterinary Medicine, Shahre-Kord University, Shahre-kord, Iran
 
Abstract: 

Changes in diameters of the preovulatory dominant follicle (for 10 days before ovulation) and corpus luteum (during the estrous cycle ) paralleling with plasma estradiol - 17 β and progesterone profiles were monitored in seven healthy Caspian mares aged 8.8± 1.53 Years and weighed 198.6 ± 0.9 kg . The plasma concentration of estradiol - 17 β was progressively (p<0.05) increased from day 6 to day 2. When the peak value was attained, it then sharply decreased to the basal concentrations at the time of ovulation, the first significant (p<0.05) rise in plasma progesterone concentration was detected 24 after ovulation, it was steadily increased until day 4 after ovulation. the concentrations were remained elevated until day 12 from day 10 onward the gradual decrease in plasma progesterone concretions was noticed with the first significant drop between days 12 and 13 there was a significant (P<0.05) correlation between plasma progesterone and estradiol - 17 β concentrations with cyclic changes in corpus luteum and preovulatory follicle respectively the results suggest that in Caspian mares as compared to other breeds. The progesterone levels began to decrease earlier. Due to earlier occurrence of autolysis and regarding to estradiol - 17 β there was an extra minor peak that occurred at about day 8.

 
Keyword(s): PROGESTERONE, ESTRADIOL - 17 Β CASPIAN, MARE
 
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