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Reproductive consequences of maternal care patterns during estrus among free-ranging rhesus monkeys

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We examined the hypothesis that among free-ranging rhesus monkeys (Macaca mulatta), maternal care patterns during estrus influence chances of conception independently of variation in the timing of the postpartum resumption of mating. We observed 24 multiparous mothers and their infants before and during the 1990 mating season. When mothers resumed mating, they abruptly sought less contact with their infants. Infants responded by increasing the rates with which they emitted distress calls and attempted to make nipple contact. High levels of maternal rejection and low levels of maternal nipple contact initiation during the mother's first estrus were associated with low suckling frequencies and high chances of conception. Although demanding infants had some success in gaining access to the nipples of reluctant mothers during estrus, mothers' chances of conception were unrelated to measures of infant demand or distress calling. Individual differences in maternal behavior regulating access to the nipple during estrus were unrelated to those shown previously. During estrus, mothers appeared to regulate nipple contact according to their infant's age and perhaps other factors related to its vulnerability.

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Correspondence to: C.M. Berman

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Berman, C., Rasmussen, K. & Suomi, S. Reproductive consequences of maternal care patterns during estrus among free-ranging rhesus monkeys. Behav Ecol Sociobiol 32, 391–399 (1993). https://doi.org/10.1007/BF00168823

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