The effect of crossbreeding of sheep of the Pechora population with Romney Marsh on the maturity and fertility of hybrids
Abstract
The aim of this work was to study the influence on the maturity and fecundity of sheep of the Pechora local population (PP) of their crossing with Romney marsh (RM). The high phenotypic variability of age at first calving have installed mongrel hybrids 50P/50RM and 25P/75RM. Maximum fertility characterized Pechora ewes (P/P) and 50C/50RM. The average fecundity was of the uterus 50P/50RM. Purebred Romney marsh had the lowest rates of fertility. The frequency of multiple lambing we significant differences established between the Mature ewes P/P and 50C/50RM with other genotypes. The study showed that when the content in nutritionally insufficient diets purebred ewes RM/RM greatly lost in fertility to the hybrids of the first generation. The use of the breed, Romney marsh domestic breeding for crossing with local sheep Pechora populations in adverse environmental conditions have led in the second generation at the Romney marsh to a significant reduction in fertility compared to a half-breed and mixed-breed ewes, are related by type to the Pechora breed group, as compared with genotype 50C/50РМ, in addition to a significant increase of age at first calving. Thus, with increasing breed by Romney Marsh precocity and fertility of ewes decreased.
About the Authors
V. Bobretsov
FGBNU Pechorskaja opytnaja stancija im. A.V. Zhuravskogo
Russian Federation
Russian Federation
L. Kaneva
FGBNU Pechorskaja opytnaja stancija im. A.V. Zhuravskogo
Russian Federation
Russian Federation
J. Kozlova
FGBNU Pechorskaja opytnaja stancija im. A.V. Zhuravskogo
Russian Federation
Russian Federation
Y. Zharikov
FGBNU Vyl'gortskaja nauchno-jeksperimental'naja biologicheskaja stancija
Russian Federation
Russian Federation
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Review
For citations:
Bobretsov V., Kaneva L., Kozlova J., Zharikov Y. The effect of crossbreeding of sheep of the Pechora population with Romney Marsh on the maturity and fertility of hybrids. Genetics and breeding of animals. 2017;(1):67-71. (In Russ.)
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