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Members of the microtine species are probably reflex ovulators. The prairie vole, Microtus ochrogaster (Richmond & Conway, 1969), the meadow vole, M. pennsylvanicus (Clulow & Mallory, 1970), the levant vole, M. guentheri (Bodenheimer & Sulman, 1946), the Californian vole, M. californicus (Greenwald, 1956), and the montane vole, Microtus montanus (Gray, Davis, Zerylnick & Dewsbury, 1974) have all been regarded as coming into this category and Breed (1967) has demonstrated that members of M. agrestis are also reflex ovulators. As ovulation is normally preceded by a surge of LH in the blood, post-coital levels of serum LH were measured by radioimmunoassay in female and male voles (M. agrestis) after mating. The method used was that described by Niswen- der, Midgley, Monroe & Reichert (1968) for rat LH, as modified by Naftolin & Corker (1971). The voles in these experiments were sexually mature adults from the Depart- mental colony. The females weighed approximately 20 g, and the males about 25 g. Matings took place in circular glass troughs 20 cm in diameter, and 10 cm deep. These were covered with wooden lids equipped with ventilation holes. A 'successful mating' involved lordosis in the female, intromission by the male, and the subsequent presence of a seminal plug in the vagina. Males and females were bled, at various times, from the sub-orbital canthal sinus under light ether anaesthesia. No blood samples were taken before mating because our assay system could not measure with accuracy levels around or below 1-0 ng NIH-LH-S13/ml. Although females with moist patent vaginae were used in these experiments, the incidence of successful matings was only about 60%, and a rise in serum LH levels was only detected in those females in which lordosis occurred and a vaginal plug was found after mating. In all other females, even though the male may have attempted to mount several times over a period of 15 min, the serum LH remained low. The first blood samples were taken within 5 min of a successful mating and high levels of LH were recorded at this time, with a mean of 61-0 + 5-7 ng NIH-LH-S13/ml (number of samples = 20). There was a progressive

THE EFFECT OF MATING UPON LH RELEASE IN MALE AND FEMALE VOLES OF THE SPECIES MICROTUS AGRESTIS