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Filial attachment in sheep: similarities and differences between ewe-lamb and human-lamb relationships

By R. Nowak, X. Boivin

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Abstract

Animals develop relationships with intra- and interspecific partners, including humans. In some cases this can lead to strong emotional bonds indicating the existence of attachment. The sheep is well known to develop various forms of social attachment (mothers towards young, lambs towards siblings). The relationship they can develop with humans is much less understood. In this review, based on the attachment theory framework developed in human infants, we outline features and mechanisms that participate in the development and the expression of affiliative behaviours that lambs can develop with their mother or a human. Behavioural tests comparing responses towards a presumed attachment figure with those directed towards unfamiliar or familiar conspecifics demonstrate that lambs do search specifically the proximity of their mother or human caregiver. Differential emotional responses in the presence (calmness) or the absence of the partner (agitation) are also expressed. However, a relationship with a human takes place more easily when lambs are reared without their primary attachment figure, the mother. Human-lamb attachment is then facilitated by positive social contacts (gentling, hand-feeding) provided by a specific caregiver. In the case of attachment with the mother, suckling is the main reward. Although the existence of a sensitive period is still unclear, in both cases attachment develops more rapidly if positive interactions take place immediately after birth. Three neurochemical systems have profound impact on the expression of filial attachment in sheep: the gut peptide cholecystokinin, endogenous opioids, and oxytocin, all known to play a key role in prosocial behaviours in mammals. In addition, positive nutritive or non-nutritive interactions activate specific brain regions that are involved in the expression of social and emotional behaviours. In conclusion, lambs do develop intra- and interspecific attachment but not in a concomitant manner as the presence of the mother strongly reduces their motivation to interact with a human. Nonetheless, under artificial rearing conditions the human becomes a salient attachment figure.

Publication Title Applied Animal Behaviour Science
Volume 164
Pages 12-28
ISBN/ISSN 0168-1591
Publisher Elsevier
DOI 10.1016/j.applanim.2014.09.013
Language English
Author Address INRA, UMR85 Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, France.Raymond.Nowak@tours.inra.fr
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Tags
  1. Animal behavior
  2. Animals
  3. Animal science
  4. Artificial rearing
  5. Bovidae
  6. Brain
  7. Emotions
  8. Hormones
  9. Humans
  10. Infants
  11. Interactions
  12. Intestines
  13. Lambs
  14. Mammals
  15. Men
  16. mothers
  17. opioids
  18. Oxytocin
  19. peer-reviewed
  20. Primates
  21. Reviews
  22. Ruminants
  23. Sheep
  24. suckling
  25. ungulates
  26. vertebrates
  27. Wool producing animals
Badges
  1. peer-reviewed