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- W2051795745 abstract "In mammals, the most significant maternal effect on offspring growth during lactation is the ability of females to efficiently transfer milk energy to their neonates. However, despite the importance of the transfer of milk energy to both maternal and offspring fitness, nothing is known about the extent to which variation among females may be attributed to differences in individual quality or environmental variation in natural populations. We measured repeatability over multiple lactation periods in components of lactation performance in free‐ranging, multiparous gray seal ( Halichoerus grypus ) females to examine to what extent variation among females in pup weaning mass may be attributed to inherent differences in their physiological capacity to deliver milk energy. Levels of repeatability were high for milk composition ( r = 0.38–0.50), daily milk output ( r = 0.46), and the duration of lactation ( r = 0.57), demonstrating that there are consistent differences among females in these characters across lactations and that the overall capacity of gray seal females to deliver milk energy to their pups is characteristic of individuals. The repeatability in pup weaning mass ( r = 0.48) was consistent with the values for the components of total milk energy output and suggests that, over a large proportion of their reproductive life, individual gray seal females will consistently wean pups with greater or lesser probabilities of survival. Our results suggest that inherent differences among females in their physiological capacity to deliver milk energy may be an important component of variation in individual quality and, thus, lifetime reproductive success in mammals. High levels of repeatability also suggest that components of milk energy transfer may have a significant heritable genetic basis." @default.
- W2051795745 created "2016-06-24" @default.
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- W2051795745 creator A5044569401 @default.
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- W2051795745 date "2009-09-01" @default.
- W2051795745 modified "2023-10-18" @default.
- W2051795745 title "Repeatability in lactation performance and the consequences for maternal reproductive success in gray seals" @default.
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- W2051795745 doi "https://doi.org/10.1890/08-1386.1" @default.
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