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Effects of parity on reproductive performance in lines of mice selected for litter size or body weight



Effects of parity on reproductive performance in lines of mice selected for litter size or body weight



Revista Brasileira de Genetica 3(1): 1-20



Reproductive performance of 5 lines (L) of mice, where females to be evaluated were reared in 3 postnatal litter sizes (N), was compared from 1st to 2nd or 3rd parity (P). Lines were selected for 17 generations as follows: large litter size (L+), large 6 wk body weight (W+), small litter size and large 6 wk body weight (L-W+), large litter size and small 6 wk body weight (L+W-) and randomly (K). Levels of N were 8, 12 and 16. The objective was to determine the magnitude of parity effects and interactions involving parity for litter size, litter weight, weight gain and feed efficiency and female weight and feed intake measured from parturition to weaning at 21 days. The L x N x P interaction was not significant for any trait. The N x P interactions were significant for female body weight at parturition and female weight change from 12-21 days postpartum, but neither interaction was biologically important. The effect of N on litter size and other reproductive traits persisted over parities. The L x P interactions were significant for litter size at birth, 12 and 21 days; litter birth weight; and female weight at parturition; the criterion of selection may have modified the influence of parity on these traits. Litter weights, weight gains and feed efficiency and female body weights increased with parity, while exhibiting no important interactions. Pooled repeatabilities for litter size were 33 .+-. 0.04, 16 .+-. 0.07 and 18 .+-. 0.06 for parities 1 and 2, 1 and 3, and 2 and 3, respectively. Repeatability between parities 1 and 2 for litter weights, weight gains and feed efficiency ranged from 0.22-0.45, except for litter feed efficiency from 12-21 days which was 0.01 .+-. 0.06.

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