Estimation of genetic and phenotypic parameters in a closed ...
Estimation of genetic and phenotypic parameters in a closed ...
Estimation of genetic and phenotypic parameters in a closed ...
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11<br />
ASSTRACT<br />
Phenotypic <strong>and</strong> <strong>genetic</strong> <strong>parameters</strong> <strong>of</strong> some reproductive traits <strong>in</strong><br />
sw<strong>in</strong>e were estimated from 1 ,264 Lrtters <strong>of</strong> first<br />
parÍty }lanagra gilts<br />
farrowed between L967 anô, 1977. Means <strong>and</strong> st<strong>and</strong>ard deviations for the<br />
traits <strong>of</strong> total number <strong>of</strong> pigs born, number born alive, number at<br />
wean<strong>in</strong>g, average birth weÍght <strong>and</strong> average wean<strong>in</strong>g weight were: 9.681<br />
2.22, 9.L7!2.L3, 7.68!2.L6, 1.3410.18 kg <strong>and</strong> 10.66!I.52 kg, respectively.<br />
SignÍficant dÍfferences were observed among three different farrorn'<strong>in</strong>g<br />
groups <strong>and</strong> among years <strong>in</strong> all reproductive traits.<br />
HeritabilíÈy<br />
estimates r,rere as follows: total number <strong>of</strong> pigs born, 0.0710.12;<br />
number <strong>of</strong> pigs born alive, 0.0210.12; number <strong>of</strong> pigs weaned, 0.0110.12;<br />
average birth weight, 0.36t0.11; <strong>and</strong> average wean<strong>in</strong>g weight, 0.3710.11.<br />
PhenotypÍc correlations among the three different litter<br />
size traits<br />
were highly positive <strong>and</strong> the correlation between average birth weíght<br />
<strong>and</strong> average wean<strong>in</strong>g weight was moderately posÍtive. Phenotypic correlations<br />
between litter si-ze' traits <strong>and</strong> average pig r.igfrt traits were<br />
moderately negative except for the correlaËion <strong>of</strong> nr:mber weaned r¿ith<br />
average bírth weight. Genetic correlations between total number born<br />
<strong>and</strong> average pig weight at birth <strong>and</strong> at wean<strong>in</strong>g were 0"3010.46 <strong>and</strong> 0.92!<br />
0.09, respectively. Genetic correlations betv¡een average wean<strong>in</strong>g<br />
weight <strong>and</strong> nr:mber <strong>of</strong> pigs weaned <strong>and</strong> average birth weight r,¡ere 0.5211.05<br />
<strong>and</strong> 0 .77x0.20, respectively.<br />
Phenotypic <strong>and</strong> genetÍc <strong>parameters</strong> for carcass aeasurements <strong>and</strong> age<br />
to market weight were estimated from data on 1r455 Managra pigs consist<strong>in</strong>g<br />
<strong>of</strong> 425 barrows <strong>and</strong> 1,030 gilts over a seven year period (1971-<br />
1977). Means <strong>and</strong> st<strong>and</strong>ard devÍations for 10 traits \^rere as follows:
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