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Dol e:t e I R.: Dynamics of the Follicular Development During PR1D Treatment and Quality of the Following Sexual Cycle in Postpartum Cows. Acta vet. Brno 1995.64:187-194. Ten postpartum cows (Bohemian Pied Cattle) were treated by progesterone intravaginal device (PRID) for 10 days. Four untreated cows served as the control group. Transrectal ultrasonographical examination and sampling of milk and peripheral blood for milk progesterone and plasma estradiol assay were performed at 3 and 4 alternating intervals from the day 510 post partum to the 2nd postpartum ovulation. Follicles persisted during PRID treatment. Dominant follicles slowly grew and ovulated on the day 3 ± 0.63 after progesterone treatment in cows with follicular dominance at the term of PRID insertion and they ovulated on the day 5.3 ± 1.26 in cows without follicular dominance before PRID. Concentration of the plasma estradiol (42.9 ± 20.65 pglml) varied and concentration of the milk progesterone (0.8 ± 1.18 nglml) after the initial increase decreased during PRID treatment. Two and three follicular waves occurred before the 1st postpartum ovulation and during the 1st postpartum sexual cycle in the control cows. Concentration of plasma estradiol increased in relation with growth of the dominant follicles and the particular peaks gradually increased from parturition to the 2nd ovulation. Low concentration of the milk progesterone temporarily increased during the 1 st postpartum sexual cycle. We found the term of the 1st postpartum ovulation. the length of the 1st postpartum sexual cycle and the number of follicular waves during the sexual cycle in PRID treated cows and untreated cows 29.3 ± 3.89 : 23.8 ± 5.19 day post partum. 19.8 ± 2.44: 19.3 ± 1.71 days and 2.3 ± 0.48 : 2.5 ± 0.58 respectively. Dominant follicle. follicular wave. postpartum ovulation. postpartum sexual cycle. plasma estra­ diol. milk progesterone

Dynamics of the Follicular Development During PRID Treatment and Quality of the Following Sexual Cycle in Postpartum Cows