Social aggregations in cattle. II. Contributions of familiarity and genetic similarity

Social aggregations of three cattle breeds and crosses between them were studied under controlled conditions at a Brazilian research station. Cows raised with animals of their own breed in isolation from other breeds maintained segregated social gruops. Cattle of the same breed raised apart formed aggregations based more on familiarity than on genetic communality. There were breed differences in both of those tendencies. Hybrids were no more likely to associate with cattle with which they had one breed in common than with animals of completely different breeds, although having two breeds in common increased the likelihood that hybrids would be found together. Recently weaned calves did not assort themselves by shared kinship, but they formed phenotypic groupings correlated with color. In the absence of familiar individuals, cattle may use familiar phenotypes in establishing social preferences and cohesive herds.This research was supported, in part, by funds from the Brazilian government's Conselho Nacional de Pesquisa and the Fundação de Amparo de Pesquisa do Estado de São Paulo. Portions of this report were presented at the XVIII Annual Meeting of the Behavior Genetics Association, University of Nijmegen, Nijmegen, The Netherlands, 25 June 1988.