GONADOTROPIC HORMONE IN THE NON-PREGNANT MARE

Abstract
Blood samples were drawn every 4 to 7 days throughout the cycle from several mares. The gonadotropic hormone was extracted from the serum by a modification of the Cartland and Nelson method. In most instances from 2 to 30 rat units of hormone per liter of serum were found, with some indication that the greatest conc. is reached during metoestrum. Higher concs. were found in mares with abnormally long cycles than in those having normal cycles. The hormone could not be distinguished biologically from that found in the blood serum of the pregnant mare.