Abstract
The experiments presented here were designed to investigate the influence of previous incubating and maternal experience on maternal responsiveness of the hen. During the first experiment, newly-hatched chicks were introduced into the nest of 10 incubating hens (Vedette JV 15 strain). These animals presented immediate maternal responses (brooding, maternal calls) and showed modifications of typical endocrine state, especially a decrease in prolactin concentrations. In a subsequent induction experiment, the 10 previously incubating and maternal hens, (considered to be experienced animals), and 10 naive subjects, from the same flock and of the same age were given chicks in order to provoke the appearance of maternal responses. During this experiment, maternal responses developed progressively in the 20 hens. Experienced hens did not respond differently to chicks than naive hens. In addition, the subjects of both groups presented identical hormone concentrations (prolactin and luteinizing hormone). The influ...
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