Ewe lambs from 2 breeds (Merinos d'Arles and Romanov) and their crossb
reds, from Merinos ewes sired by Romanov rams, were observed during 5
individual tests. During the first 3 tests there were no other sheep i
n sight and animals were alone, with concentrate or with a human. Duri
ng the last 2 tests, some penmates were in sight and the experimental
animal was alone or with a human. Romanov animals were much more react
ive than the Merinos. They eliminated more ate less and avoided the hu
man more. For most of the criteria, crossbreds were closer to the Roma
nov than to the Merinos purebreds. This seemed to be due to genetic di
fferences and not to direct maternal influence.