[Effect of environmental genetic factors on some components of the numerical productivity of pigs [Portugal]]
1997
Cruz, V.F. da | Rosmaninho, F.
In the pig house of Mitra Experimental herd (Evora University) a control ofreprodutive traits and of weight of piglets was effectuated during one year. The aim of present research are to examine the parity and breed of dam, the breed of sire and birth season effects on pig produtivity till the weaning. There was not effect to genetic factors or of parity effects on sow produtivity. The birth occured in Winter and in Summer had higher (p0.05) number of piglets (10.9 vs 10.7) than the Autumn birth's. The piglets weight at weaning was significantly (p0.001) higher on piglets born in 4th ou on 5th parturition. The piglets born in Summer were significantly heavier (p0.01) at weaning (12.6 kg) than the piglets born in Winter (10.7 kg) or in Autumn (9.6 kg). The effects of birth number (parity) on sow produtivity could be atenuate by using more extensive reproduction rhythm. The season of birth is one of the factors which has more importancy on pig produtivity till weaning
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