[Use of foreign breeds in improvement of the much fertile fine-wooled sheeps]
2007
Pentkovskaya, G.S. | Shatskij, A.D., Grodno State Agrarian Univ. (Belarus)
Positive influence of rams of import breeds tekstel and il-de-frans on efficiency and reproductive abilities of sheep of hybrid origin is proved. The hybrids received on the basis of breed tekstel are characterized by higher indicators of productive qualities in comparison with contemporaries of breed il-de-frans. The scheme of use of import breeds in perfection of polycarpous of fine-wooled sheeps is offered. Scheme of crossing consists of the following stages: 1. Reception of two-breed hybrids from crossing of uterus of polycarpous type with import rams tekstel and il-de-frans. Duration of the first stage is defined by quantity of hybrids sufficient for reception of a quarter of thorough-bred on import breeds of animals in variants of use of returnable crossing; 2. Studying of productive qualities of hybrids of the second generation from 1/4 of share of blood of import breeds taking into account selection principles; 3. Breeding of hybrids (in itself) of desirable type and a quarter of blood on import breeds. According to the offered scheme, it is supposed to receive at the last stage of crossing a quarter of thorough-bred animals on import breeds. In the subsequent the genetic design of hybrids will combine 1/4 of share of blood of breed tekstil or 1/4 of il-de-frans and 3/4 of polycarpous type
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