CORRELATIVE RELATIONSHIP BETWEEN REPRODUCTIVE TRAITS IN SOWS OF DIFFERENT GENOTYPES USING BOARS OF VARIOUS BREEDS

Abstract

Improving the reproductive traits of sows contributes to an increase in the
production of pork by obtaining an additional number of young animals. The studies were
carried out in the Academy of Agricultural Sciences “Mikhailovskoe” of the Saratov Region,
where the correlations of the reproductive traits of Large White sows and crossbreeds (LW x
LB) were studied when crossing them with boars of different breeds.
The study of correlations between reproductive traits made it possible to establish that
the milk producing ability of sows and the litter weight after 60 days is influenced by prolificacy. The correlation coefficient was 0,12-0,56 and 0,16-0,5, and the relationship of prolificacy with birth weight and piglet weight after 60 days was negative (r = -0,95-0,96; r = -0,24-
0,78). Also, in all groups, a negative correlation was observed between birth weight and milk
producing ability, litter weight after 60 days (r=- 0,14-0,51 and r=- 0,18-0,57). There was a
positive definitive correlation between birth weight and piglet weight after 60 days in the
groups of crossbred sows with the use of Duroc (r = 0,52, P>0,99) and Landrace (r = 0.66,
P>0,999) boars. The highest positive correlation (P>0,999) was between milk producing ability and litter weight after 60 days in sows (LW x LB) when they were crossed with Landrace
boars (r = 0,66), Precocious Meat breed (r = 0,89), in sows of the LW x LB combination (r =
0.91) and between litter weight after 60 days and number of piglets after 60 days – in sows of
combinations LWxLW (r = 0,87), (LW x LB)xD (r = 0,96), (LW x LB)xL (r = 0,75), (LW x
LB)xPM-1 (r = 0,89).The result of the study of the correlative relationship between reproductive traits of purebred and crossbred sows showed that, by most traits, crossbred sows (LW x
LB) when crossed with Duroc and Landrace boars, were superior to their herdmates of purebred breeding.