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Selection for ovulation rate in swine: correlated response in litter size and weight



Selection for ovulation rate in swine: correlated response in litter size and weight



Journal of Animal Science 48(3): 509-516



Generations (9) of direct selection for ovulation rate (OR) were evaluated to determine the magnitude of the correlated response in 3 litter sizes and 2 litter wt traits. A total of 387 select line and 394 control line litters were included in the 10 generations of data. Realized heritability of OR was 0.42 .+-. .06 based on the regression of response (select-control) on weighted cumulative selection differential. Regressions of line means on generation number were significant for litter birth wt in both lines (-0.31 .+-. 0.12 kg, select; -0.41 .+-. 0.06 kg, control) and for litter weaning wt (-3.4 .+-. 0.8 kg) in the control line. None of the other regressions of line means on generation number was significantly different from 0. Regressions of line difference (select-control) on generation number were 0.06 .+-. 0.07, 0.07 .+-. 0.07, 0.10 .+-. 0.07, 0.10 .+-. 0.10 kg and 1.2 .+-. 0.8 kg for total number farrowed (TNF), number farrowed alive (NFA), number weaned (NW), litter birth wt (LBW) and litter weaning wt (LWW), respectively. None of these estimates of correlated response was significantly different from 0. Estimates of realized genetic correlation obtained were 0.07 (OR-TNF), 0.11 (OR-NFA), 0.24 (OR-NW), 0.18 (OR-LBW) and 0.20 (OR-LWW). Although positive, none of the estimates approached statistical significance indicating that direct selection for ovulation rate would be expected to have little genetic effect on litter productivity. The failure to obtain significant correlated responses in litter size was suggestive of a decline in fertilization rate and/or embryonic survival since ovulation rate was increased by selection.

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Accession: 006380618

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PMID: 575131



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