Reproductive qualities of Large White sows at linear breeding and crossing
Abstract
The aim of the work is to study the reproductive qualities of Large White (LW) sows at linear breeding and of the variants of two-and three breeds crossing with Landrace (L), Duroc (D) and Pietrain (P) sires. The analogical schemes of breeding are used at present at the most of big swine complexes in RF. The estimation of 1074 farrows from 475 dams - daughters from six sires of Large White breed shows that the number of pigs per litter at linear breeding and at crossing with Landrace varies from 11,04 to 12,07, the number of pigs per litter at weaning varies from 10,61 to 11,11 , and the weight of litter at 30 days is 85,8 - 97,4 kg. Results of two factor dispersion analyses reveals reliable influence of breed on total number of pigs at birth. The influence of some sires one can see in indices of number of pigs and weight of litter at birth and at 30 days. The combined influence of two factors is reliable for all indices of dams´ reproductive qualities. When compare three breeds crossing and two breeds crossing LW×L, the number of pigs per litter increases by 0,63 and 0,73 pigs in variants (LW×L)×D and (LW×L)×P accordingly. As for other indices the differences are unreliable. The analyses demonstrate the fact, that at relatively high level of productivity of purebred linear sows the crossing with sires of other dam line doesn´t gives heterosis in reproduction qualities. As a result of crossing of hybrid sows with terminal sires the number of pigs, the vitality of litter are increased and the production of standard meat product with minimal expense of feed per 1 kg of weight increase is achieved.
About the Authors
N. .. Sokolov
Federal state budget scientific iDuninnstitution “Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine”
Russian Federation
Russian Federation
N. .. Zelkova
Federal state budget scientific iDuninnstitution “Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine”
Russian Federation
Russian Federation
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Review
For citations:
Sokolov N..., Zelkova N... Reproductive qualities of Large White sows at linear breeding and crossing. Genetics and breeding of animals. 2019;(1):49-54. (In Russ.)
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