Estrus reaction of gilts as selection criteria for litter size
2009
Vidovic, V., Faculty of Agriculture, Novi Sad (Serbia) | Punos, D., Potomac, Futog (Serbia) | Tadic, M., Carnex, Vrbas (Serbia)
The analysis of oestrus symptoms has been done on 656 purebred and 884 crossbred gilts. Heritability estimates for oestrus reaction in purebreds were low, 0.12 and 0.14 for crossbreds. The heritability for number of ovulation eggs in purebreds and crossbreds were 0.40. Genetic correlations between oestrus reaction and litter size in the first litter were high: 0.88 than oestrus reaction and life production 0.76. Correlation between same traits for crossbreds were higher: 0.93 and 0.87. In carantin room we measured age and weight of gilts together with oestrus. The first oestrus showed 90.8% and the second 90.2% in purebreds and 94.7% and 93.8% at F1 gilts. The gilts which did not show regular first and second oestrus get born between 2 and 9, average 6.23 for purebred and 7.11 F1 alive piglets. Later on they had longer interval between birth and next oestrus, 17-48, average 32 empty days for purebred and 28 crossbred gilts. Those animals had significant lower life production. In conclusion, it is necassary to note oestrus reaction in carantin room at the beginning of production life of gilts. Gilts with irregular oestrus is necessary to get out of production immediately from carantin room to decrease economical losses in production.
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