Genetic, Phenotypic and E N V I R O N M E N T a L Relationships between Sow Body Weight and Sow Productiv Ity Traits 1
نویسنده
چکیده
Yorkshire and Duroc litter records were used to estimate genetic, phenotypic and environmental relationships between sow body weight and sow productivi ty traits. Two data sets with two subsets each were used to complete this study; 663 and 460 records included li t ter traits only, while 522 and 359 records also contained sow body weight for Yorkshires and Durocs, respectively. Heritabil i ty estimates for number born (NB), number born alive (NBA), total birth weight of live pigs (BWLIT), li t ter weight at 3 wk (WT3WK), sow weight at parturi t ion (WTDAMPAR) and sow weight at weaning (WTDAMWN) were .24 -+ .14, .21 -+ .14, .42 -+ .16, .19 + .14, .72 + .21 and .42 + .18, respectively, for Yorkshires and .05 + .10, .04 -+ .10, .21 +.14, .25 -+ .15, .85 -+ .25 and .87 • .26, respectively, for the Dur0cs. Repeatabi l i ty estimates for NB, NBA, BWLIT, WT3WK, WTDAMPAR and WTDAMWN were .13 + .06, .17 + .06, .27 -+ .06, .13 -+ .06, .64 -+ .05 and .54 -+ .05, respectively, for Yorkshires and .17 + .06, .21 +.06, .14 + .06, .17 • .06, .28 + .07 and .39 -+ .07, respectively, for Durocs. Genetic correlations among litter traits were high and positive in the Yorkshire data. Genetic correlations between NBA and WTDAMPAR, NBA and WTDAMWN, WT3WK and WTDAMPAR, and
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