Browsing by Author "Semacan, A"

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The Effect of Follicle Diameter on Estrous and Ovulation Time During Pgf2α Injection in Mares
(Scientific Technical Research Council Turkey, 1998) Semacan, A; Demirel, M; Tasal, I
Variations in estrous and ovulation times occur because of follicle diameter during PGF2 alpha injection, in mares. The purpose of this study was to see the effect of follicle diameter on estrous and ovulation. Therefore 43 estrous cycles were evaluated in 32 Thoroughbred mares. Ten mg PGF2 alpha (Dinoprost Tromethamine, Dinolytic) was injected intramuscularly in diestrous period for synchronization. Follicle diameters were measured and divided into groups in centimeters as follows less than or equal to 1 cm, 1-2 cm, 2-3 cm, 3-4 cm ve > 4 cm, during PGF2 alpha injection. Result of daily teasing and rectal palpation every other day and daily rectal palpation during estrous period revealed that post injection-estrous. estrous period, post injection-ovulation. and estrous-ovulation times were in group less than or equal to 1 cm 5.91+/-2.71, 7.25+/-1.43. 11.75+/-2.23 and 6.16+/-1.95 days, in group 1-2 cm 4.81+/-2.84, 6.56+/-1.94, 10.68+/-2.95 and 5.87+/-2.85 days, in group 2-3 cm 3.90+/-1.44, 5.10+/-1.57, 8.00+/-1.78 ad 4.20+/-1.53 days and in group 3-4 cm 3.00+/-1.41, 4.60+/-1.35. 6.20+/-2.31 and 3.60+/-1.01 days, respectively. There was no follicle > 4 cm during PGF2 alpha injection. As a result, reduced estrous and ovulation times occured because of enlarged follicle diameters during PGE2 alpha injection. Therefore it was concluded that evaluation of ovaries for follicle structurs before PGF2 alpha injection would be beneficial.
Estrous, Ovulation and Pregnancy Rates Following Pgf2α Injections in Mares
(Scientific Technical Research Council Turkey, 1998) Demirel, M; Semacan, A; Tasal, I
Prostaglandin F2 alpha was commonly used for synchronisation in mares. The purpose of this study was to see the effect of single and double doses of PGF2 alpha on estrous, ovulation and pregnancy rates. Therefore 43 Thoroughbred mares, between 4-17 years old, were used. Thirty mares 10 mg PGF2 alpha (Dinoprost Tromethamine, Dinolytic) was injected intramuscularly, regardless of the stage of the estrous cycle, for synchronization. Estrous behaviors and follicular development were examined with daily teasing and rectal palpation every other day, after PGF2 alpha injection and ovulation times determined daily rectal palpation during estrous. The mares which in estrous (n: 11) natural service or artificial insemination with fresh semen were done every other day until estrous behavior lasted. The mares (n: 19), were not estrous after first PGF2 alpha injection, were injected second PCF2 alpha 14 days later and repeated all applications after first PGF2 alpha injections. Control group (n: 13) were chosen from the mares which were not injected PGF2 alpha in estrous and natural service or artificial insemination with fresh semen were done every other day until estrous behavior lasted. For pregnancy diagnosis, rectal palpation were done all mares between 30-35th and 60th days after ovulation. Estrous, ovulation and pregnancy rates obtained from first or second PCF2a injected mares and control group were 36.66%, 33.33% and 45.45%; 68.42%, 78.94% and 46.66; 100%, 92.30% and 53.84%, respectively. Consequently, because of no detrimental effect of PGF2 alpha injections on estrous, ovulation and pregnancy rates, it was concluded that PGF2 alpha injections for synchronization but, estrous and ovulation rates low in single dose injection therefore double doses injections would be more beneficial.