LEVELS OF PROGESTERONE, LH AND FSH IN THE PLASMA OF SHEEP DURING THE OESTROUS CYCLE
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Ministry of Agriculture, Fisheries and Food, Central Veterinary Laboratory, New Haw, Weybridge, Surrey KT15 3NB (Received 15th February 1975)
Although the changes occurring in the plasma levels of progesterone and LH during the oestrous cycle of sheep have been well documented, there is some doubt about the pattern of plasma FSH concentrations. We present some data on the levels of all three hormones in a limited number of plasma samples taken from ewes experiencing normal oestrous cycles.
Eight 3-year-old Cheviot ewes were kept in a paddock with a vasectomized ram during October and November. The ram was fitted with a marking harness and the coloured crayon on the harness was changed every 15 days. The ewes were examined daily and the day that a ewe was first marked by the ram was designated Day 0 of the cycle. Blood samples were taken from the jugular vein into heparinized 10 ml
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