Insemination of mares with low numbers of either unsexed or sexed spermatozoa Two experiments were conducted to determine pregnancy rates in mares inseminated 1) with 5, 25 and 500 × 10 6 progressively motile spermatozoa (pms), or 2... BR Buchanan,G.E. Seidel Jr.,PM Mccue,... - 《Ther...