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- ArticleOvulation and the movement of the conceptus in the first 35 days of pregnancy in thoroughbred mares.Butterfield RM, Matthews RG.J Reprod Fertil Suppl. 1979(27):447-52.Data from 937 Thoroughbred mares, when analysed as a single population, showed no significant difference between the activity of the right and left ovaries and the frequency of location of 35-day pregnancies in the right and left uterine horns. Nor were any differences shown when the data were analysed in years or sire groups. However, significantly more ovulations occurred in the right ovary in September and December and in the left ovary in October and November. Whereas the left and right ovulations were equal in lactating and dry mares, there was a highly significant increase in the number of pregnancies in the right uterine horn in dry mares and in the left uterine horn in lactating mares.