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Age-related participation in allosuckling by nursing warthogs (Phacochoerus africanus)

Published online by Cambridge University Press:  01 August 1999

S. Plesner Jensen
Affiliation:
Large Animal Research Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, U.K. Uganda Institute of Ecology, P.O. Box 22, Lake Katwe, Uganda
L. Siefert
Affiliation:
Department of Veterinary Public Health & Preventative Medicine, Faculty of Veterinary Medicine, Makerere University, P.O. Box 7062, Kampala, Uganda
J. J. L. Okori
Affiliation:
Department of Veterinary Public Health & Preventative Medicine, Faculty of Veterinary Medicine, Makerere University, P.O. Box 7062, Kampala, Uganda
T. H. Clutton-Brock
Affiliation:
Large Animal Research Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, U.K. Uganda Institute of Ecology, P.O. Box 22, Lake Katwe, Uganda
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Abstract

This paper examines the distribution of non-offspring nursing or ‘allosuckling’ in warthogs Phacochoerus africanus. Of the 16 breeding groups studied, 11 contained two or more nursing females. Allosuckling occurred in six of these groups (55%). The number of juveniles per nursing female was lower for groups with allosuckling, although juvenile mortality was not measurably affected by either allosuckling, group size or the number of females in a group. Time spent drinking was longer for juveniles in smaller litters but was not influenced by allosuckling or juvenile age. Longer intervals between the females' nursing bouts resulted in longer drinking bouts for the juveniles, but there was no correlation with inter-meal intervals. The proportion of successful sucking bouts increased with juvenile age. This success rate was greater in groups without allosuckling, suggesting a better co-ordination between mother and offspring. Females appeared able to distinguish between juveniles and to nurse selectively. Four- to 5-year-old females nursed fewer juveniles than did older or younger females in their groups and were thus less likely to be donors.

Type
Research Article
Copyright
1999 The Zoological Society of London

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