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A binary variable was included that indicated whether a woman had lost one or more children from prior parities at least 12 months before the birth of the last-born child.
Women who have more sons than daughters at earlier parities will stop childbearing and thus have smaller families.
The third step involves the estimation of the mean age of women at different parities ([MW.sup.n.sub.15-49]) from adjusted proportions [PW.sup.n.sub.i], given in Table 4: Among the women reported to be ,the age group 15-19, the adjusted proportion of those with 'zero' is [PW.sup.0.sub.15-19].
The estimates of mean ages at different parities for ever married women and for currently married women, obtained by following the procedures described above, are given in Table 5.
During gestation, the maternal BW of sows should gain 25 kg per parity over three or four parities [7].
Gestation energy and reproduction in sows over four parities. Can J Anim Sci 1990; 70:493-506.
To ensure an adequate number of cases at each parity, we combined parities of 3 and higher in the multivariate analysis.
Across all parities, the desire to have another child generally declined as the number of sons increased.
These breed differences indicated that purebred Y sows produced lower number of piglets born and weaned, and lighter piglets at birth in the first parity (NBA1, NPW1, LTBW1) and for the sums from the second to last parities (NBA2+, NPW2+, LTBW2+).
Thus, heterosis of the litter increased the number of piglets and decreased litter weight in the first parity and for the sums of the second to last parities, but it had no significant effect on number of piglets at weaning in the first parity.
There was a trend of increasing prevalence at later parities, which was consistent with the results reported by Vosman et al.
Total piglets born alive over 6 parities were calculated with consideration of sow retention rate by summing the number piglets produced for all gilts that were initially artificially inseminated (Patterson et al., 2010).