Docility tests were performed over 3 trait with four classes. Tests were performed by seven yr on 906 Limousin heifers sired by 34 males. The different handlers. The effects of handler, year, birth heifers were tested individually when they were 10 t o period, dam parity, birth region, husbandry system, 11 mo old in a pen with a handler who had 2 min to and sire were estimated. Handlers, birth period, lead the animal to a corner, keep it there for 30 husbandry system, and sire had significant effects. In consecutive seconds, and then to stroke it. Behaviors particular, animals that were managed indoors were of the animals were recorded and scores calculated. more docile than those reared out-of-doors at least The first score (docility score) was a continuous part of the time. Heritability estimates of the docility variable combining the greatest possible information. score ( .2 2) and docility criterion ( .l 8 ) seem sufficientThe second score (docility criterion) was a categorical to select for docility traits.

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