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Reproductive performance of large white and polish landrace 23 sows mated to boars of the same breed and duroc and fattening performance of their offspring



Reproductive performance of large white and polish landrace 23 sows mated to boars of the same breed and duroc and fattening performance of their offspring



Prace i Materialy Zootechniczne (42): 63-69



The experiment was conducted on the Prawdowo pig farm belonging to the Baranow Experimental Farm of the Institute of Genetics and Animal Breeding [Poland]. Reproductive performance was evaluated in 232 litters of multiparous sows including 56 litters of Large White (wbp) sows mated with (wbp) boars, 32 litters of wbp sows mated with Duroc boars, 77 liters of Polish Landrace-23 (pbz-23) sows purely bred and 67 litters of pbz-23 sows mated with Duroc boars. Piglets in a litter were counted on days, 1, 21 and 42 of life and the litters were weighed at 21 and 42 days. Experimental fattening was applied to 642 porkers including 137 pure-bred wbp, 192 pure-bred pbz-23 pigs, 103 wbp x Duroc and 207 pbz-23 x Duroc crosses. Fattening was carried out from 30 to 100 kg live weight. The results were statistically analysed using the analysis of variance and Ducan's test. When mating wbp and pbz-23 sows with Duroc boars, the number of piglets at birth, 21 and 42 days was higher from the average in pure-bred litters. The differences (0.9 piglet) between pure-bred wbp groups and pbz-23 x Duroc crosses at 21 and 42 days of life was larger than that of the remaining groups. This difference at 21 days between wbp x Duroc crosses and pure-bred pigs was significant (P .ltoreq. 0.01). The highest weight gains were observed in pure-bred wbp individuals and crosses with Duroc boars, and in pure-bred pbz-23 porkers, they were significantly smaller. Thus, crossing wbp x Duroc and pbz-23 x Duroc should be recommended.

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