PubMed Health⌕ Search

Biomedical subjects

G F Zhirkov

Publications and source records attributed to G F Zhirkov.

6 recordsLinked to original sources
PubMed1977

[Use of norgestagens for estrus synchronization if farm animals].

The action of norsteroid type preparations and their capability of synchronising oestrus in heifer and sheep were studied at laboratory and clinical levels. The effectiveness of norethysterone acetate in heifer was tested by subcutaneous injections of 5 mg and 10 mg and did not exceed the order of 50 per cent. Combination of norsteroids with serum of pregnant mares increased slightly the number of animals with synchronised oestrus and improved the rate of fertilisation. Studies conducted into sheep revealed that no complete inhibition of the sexual function was ensured by injection of norgestrol acetate with prolongator in intervals of four days. Implantation of norgestrol acetate was not effective either. Further studies are required, before the above preparations can be applied to farm animals on a large scale.

Animals↗
PubMed1977

[Experience from a 3-year administration of megestrol acetate of karakul sheep].

Five milligram of megestrol acetate were orally used over ten days during mating periods to synchronise oestrus in caracool sheep. Eighteen days were allowed to elapse from the last administration of progestagen before 1,000 I.U. PMSG were injected to boost fertility. The test reported in this paper had been applied to a large sheep herd over three years. The following conclusions were drawn: Synchronised occurrence of heat in the mating period was not reduced by oral administration of 5 mg megestrol acetate over ten days for a period of three years (87.1 to 95.5 per cent). The fertilisation rate in response to first insemination was between 68.8 and 73.1 per cent. Birth to lambs was given by 85-92 per cent of the ewes after two inseminations. No fertility occurred in 1.5-3.1 per cent of all animals.

Animals↗