title: Invited review: Effects of group housing of dairy calves on behavior, cognition, performance, and health.
abstract: Standard practice in the dairy industry is to separate the calf and dam immediately after birth and raise calves in individual pens during the milk-feeding period. In nature and in extensive beef systems, the young calf lives in a complex social environment. Social isolation during infancy has been associated with negative effects, including abnormal behavior and developmental problems, in a range of species. Here, we review empirical work on the social development of calves and the effects of social isolation in calves and other species; this evidence indicates that calves reared in isolation have deficient social skills, difficulties in coping with novel situations, as well as specific cognitive deficits. We also review the practices associated with group housing of dairy calves, and discuss problems and suggested solutions, especially related to cross-sucking, competition, aggression, and disease. The studies reviewed indicate that social housing improves solid feed intakes and calf weight gains before and after calves are weaned from milk to solid feed. Evidence regarding the effects of social housing on calf health is mixed, with some studies showing increased risk of disease and other studies showing no difference or even improved health outcomes for grouped calves. We conclude that there is strong and consistent evidence of behavioral and developmental harm associated with individual housing in dairy calves, that social housing improves intakes and weight gains, and that health risks associated with grouping can be mitigated with appropriate management.
authors.affiliation: Animal Welfare Program, Faculty of Land and Food Systems, The University of British Columbia, 2357 Mall, Vancouver, BC, Canada, V6T 1Z4.
authors.forename: J H C
authors.initials: JHC
authors.lastname: Costa
authors.affiliation: Animal Welfare Program, Faculty of Land and Food Systems, The University of British Columbia, 2357 Mall, Vancouver, BC, Canada, V6T 1Z4.
authors.forename: M A G
authors.initials: MAG
authors.lastname: von Keyserlingk
authors.affiliation: Animal Welfare Program, Faculty of Land and Food Systems, The University of British Columbia, 2357 Mall, Vancouver, BC, Canada, V6T 1Z4. Electronic address: danweary@mail.ubc.ca.
authors.forename: D M
authors.initials: DM
authors.lastname: Weary
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002417:Cattle / Q000502:physiology* / Q000523:psychology; D003071:Cognition; D003612:Dairying; D006799:Housing, Animal; D008892:Milk / Q000378:metabolism*; D012919:Social Behavior; D012931:Social Environment; D012934:Social Isolation; D013391:Sucking Behavior; D014886:Weaning; D015430:Weight Gain
keywords: individual housing; neonate development; replacement heifers; social isolation