Efficiency of treatment of follicular cysts in cows

Abstract

The aim of the work was to compare two protocols of treatment of cows with follicular cysts. 368 cows of Holstein bred were assigned for the experiment. They were 2-5 years old with average milk production of 9580 kg. The cows with ovarian cysts were randomly divided into two groups according to the treatment method. Diagnostics of the follicular cyst was performed by a transrectal ultrasonographic examination by 5 MHz linear probe. Group 1 consisted of cows (186) which were treated with GnRH on the 0 and 7th day ( 50µg, im; Supergestran ), PGF2α on 14th day (25mg, im; Oestrophan, Spofa), GnRH on 16th day (50µg, im). Insemination was done on the 17th day (20±4 hours after GnRH). Group 2 consisted of cows (182) treated with GnRH on 0 day (50 µg), PGF2α (25 mg) on 7th day and GnRH (50 µg) on 9th day. Insemination was done on the 10th day (20±4 hours after GnRH). The cows were ultrasonographically examined on the 0 and 7th day. On the 7th day after first treatment with GnRH better results (P< 0.05) were ascertained in the second group after identical treatment. In the subgroup 60 to 70 days post-partum presence of CL was of 4.54 % more and in the subgroup at 101-150 days post-partum the number of CL was up to 22.18 % more. This difference among the groups makes 28.99 %. The cows treated between 71st and 100th days post-partum in both groups had almost identical occurrence of preovulatory follicles. Significantly better efficiency (P<0.05) was achieved in the second group (31.32 %). More preovulatory follicles were ascertained at 60 to 70 days post-partum (up to 4.54 % more; P<0.05) and at 101-150 days (up to 22.18 % more). From the initial number of animals assigned for the treatment after insemination until 30 days only 30.65 and 36.65 % cows, respectively, remained pregnant. The most cows were concepted in the subgroup of 71-100 days of puerperium (15.59 % or 14.84 %). Both protocols of the treatment showed to be effective methods for the therapy of follicular cystic degeneration.