Lack of a nocturnal rise in serum concentrations of melatonin as gilts attain puberty

Twenty prepubertal crossbred gilts (Yorkshire X Hampshire X Duroc) weighing 98.1 +/- 4.2 kg at 5 mo of age were placed in an environmentally controlled room having a temperature of 18 degrees C and light:dark cycle of 12 h:12 h. Light intensity measured 700 lx at eye level to the gilts. Three mature...

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