Plasma prolactin variations in the male calf in relation to age , season and breed
نویسنده
چکیده
Plasma prolactin levels have been measured by radioimmunoassay in 42 calves collected from birth till one year of age. The calves belonged to five breeds : Franqaise-Frisonne-Pie-Noire, Charolais, Limousin, Maine-Anjou and Hereford. Prolactin levels varied according to daylength (r = 0.89), and were influenced by photoperiod as early as one month of age. Mean annual level of prolactin did not differ between breeds (min. value in Frisonne : 8.3 + 0.4 ng/ml ; max. value in Limousin : 10.7 + 1.4 ng/mi) or according to age.
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