Relationship between litter size and perinatal and pre-weaning survival in pigs

By M. Lund, M. Puonti, L. Rydhmer, J. Jensen. 2002

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Non-infectious causes of pre-weaning mortality in piglets (2016, background): “Moreover, with genetic selection for litter size it has also been observed an increase in within-litter variation in piglet BW (Lund et al., 2002; Quesnel et al., 2008).”
Genetic correlations between gestation length, piglet survival and early growth (2008, methodology): “All rights reserved. doi:10.1016/j.livsci.2007.08.014 Given the negative genetic correlation between litter size and piglet survival, selection for larger litters needs to be accompanied by selection for increased survival (Knol, 2001; Lund et al., 2002).”
Genetic Parameters for the Piglet Mortality Traits Crushing, Stillbirth and Total Mortality, and their Relation to Birth Weight (2002, background): “Very low correlations have been found between the two mortality traits (Lund et al., 2001), which indicates that their genetic backgrounds differ greatly.”
Within-litter variation of birth weight in hyperprolific Czech Large White sows and its relation to litter size traits, stillborn piglets and losses until weaning (2008, result): “The observed relation that mean birth weight decreases as litter size (total number of piglets born and number of piglets born alive) increases was confirmed in numerous investigations (e.g. Johnson et al., 1999; Roehe, 1999; Knol, 2001; Lund et al., 2002).”