Age characteristics of reproducive and maternal qualities of sheep of the prekos breed

Keywords: reproductive ability, fertility, fecundity, ewes, age, live weight of lambs, growth rate


The studies were carried out during 2020-2021 on ewes (515 heads) of the Kharkiv intrabreed type of the Prekos breed (KhTP) and their offspring in the conditions of the breeding plant of the State Enterprise of the Experimental Farm Gontarovka of the Institute of Animal Sciencе of the National Academy of Sciences of Ukraine.

It was established that for 45 days during artificial insemination, the fertility of sheep (OP), calculated according to the results of their lambing, averaged 91.8 %. The highest rate was characterized by sheep that had the third lamb - 97.3 %. According to the results of 4-6 lambs, a relatively stable high fertility of queens was noted - 93.4-95.3 %. Significant downward deviations of this indicator were observed in ewes used for reproduction in the first and second years, and especially in animals with 7 and 8 or more lambing. Analysis of variance found that the age factor of ewes is highly likely (p<0.01) associated with their fertility, and the strength of its influence ŋх 2 is 0.491.

The factor of individual rams-producers also influences (OP) ewes. The variability due to the influence of this factor varied from 87 to 95.1 %.

Different (OP) of ewes, due to their age, had a corresponding effect on the indicators of their multiple pregnancy (P), calculated per 100 inseminated heads. This indicator in ewes for the first fifth lamb ranged from 113 to 150 lambs. At the same time, there is a clear trend of its growth due to the increase in the number of reproductive years. However, this trend is not linear and is valid for animals with 1-6 lambs. Ewes with 7 and 8 or more lambs worsen their reproductive ability rather sharply.


Download data is not yet available.


Nezhlukchenko N. V. Vidtvoriuvalni yakosti ovets tavriiskoho typu askaniiskoi tonkorunnoi porody zalezhno vid pokhodzhennia. Visnyk Sumskoho natsionalnoho ahrarnoho universytetu. Seriia «Tvarynnytstvo». 2015. Vyp. 2(27). S. 175–179.

Martнnez, J. A. R., Piсa, R. G., Caratachea, A. J., Patiсo, A. B., Espinoza, Villavicencio, J. L. & Razo, G. S. (2017). Estrus, fertility and prolificacy in Wool Sheep treated with Melengestrol Acetate on the reproductive and non-reproductive. Period. Transylvanian Review, XXV, (22), 5689-5695. https://

Fadare, А. (2015). Reproductive traits among Black, White and Brown West African Dwarf sheep. Livestock Research for Rural Development, 27(2), from fada27024.

Kridli, R. T., Abdullah, A. Y. & Husein, M. Q. (2009). The effect of breed type and lactation status on reproductive performance in Awassi ewes. South African Journal of Animal Science, 39(1), 15-18.

J. E. Newton, D. J. Brown, S. Dominik and J. H. J. van der Werf. Impact of young ewe fertility rate on risk and genetic gain in sheep-breeding programs using genomic selection Animal Production Scince 57(8) 1653-1664

Ivanova, T., Stoikova-Grigorova, R., Bozhilova-Sakova, M., Ignatova, M., Dimitrova, I. & Koutev, V.(2021). Phenotypic and genetic characteristics of fecundity in sheep. A review. Bulgarian Journal of Agricultural Science, 27 (No 5) 2021, 1002–1008..

Ristanovic, B., Z.Ю. Iliж (2018): Effect of mother’s age on body weight of lambs from birth to weaning in various strains of domestic sheep pramenka. - Genetika, Vol. 50, No. 3, 1055-1065.

Lind V., Ruderaas N. and Rшdven R. 2013. Influence of maternal age and pasture use on lamb growth on islands in Northern Norway. Grassland Science in Europe, Vol. 18 p. 433-435

Sava C.A., Pascal C., Zaharia N., Zaharia R., Atanasiu T.S., 2011, Мother's age and lambing type as influencial factors on body growth and development of youth sheep. Lucrгri Єtiinюifice - vol. 55, Seria Zootehnie p. 131-135 .

Aguirre Riofrio, E. L.; Ferraz, J. B. S.; Mattos, E. C.,2016, Influence of non-genetic factors on growth and reproductive traits of sheep Santa Inкs in extensive systems. Livestock Research for Rural Development, Cali, v. 28, n. 7. Disponнvel em: <

How to Cite
Pomitun, I. A., Kosova, N. A., Korkh, I. V., Pankiv, L., Bezvesilna, A., Boyko, N. V., Pomitun, L. I., & Danilova, T. N. (2022). Age characteristics of reproducive and maternal qualities of sheep of the prekos breed. Animal Husbandry of the Steppe of Ukraine, 1(2), 132-139.