Effect of vaginal length of cochinatas on the size of the litter at birth
Abstract
180 Yorkshire x Landrace gilts were sampled to evaluate their vaginal length effect upon farrow size. These gilts, at commercial age and weight averaging 2,87 ± 3,166 days old and 98,486 ± 0,570 kg, respectively, had two or more rut cycles registered. Average gilt vaginal length at mating time was 22,439 ± 0,117 cm and the average farrow size was 8,571 ± 0,159 piglets born alive. The gilts were distributed into two groups taking into account all vaginal meas- urements, i.e., Group A (<22 cm, 87 animals) and Group B (>22 cm, 93 animals). Standard media and error were es- timated for the studied variables and a simple regression analysis was carried out to determine vaginal length effect upon farrow size at birth. Little homogeneity was found concerning age (100-474 days old) and weight (79-125 kg) at mating; besides, vaginal length was not correlated to farrow size at birth in any group (A r=0,065 and B r=0,131). Therefore, this trait is not useful in determining farrow size when born from females below age and weight standards at mating.
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