Abstract
Extract Losses during pregnancy in the thoroughbred mare are very common. There are, however, very few detailed reports on either incidence, stages of pregnancy at which the losses occur, or their aetiology. Matassino (1962) Matassino, D. 1962. A study of the vital statics of Hafling mares in Southern Italy. I. Services, conceptions, non-pregnancies, abortions, parturitions and average age at different parturitions. Ann. Fac. Sci. agr. Portici, 28: 249–267. Ser. 3 [Abstr. 1788 in Anim. Breeding Abs., 31 (1963)]. [Google Scholar] reported an overall abortion rate of 13.8% in Italy, reaching a peak in young horses of 34%. Du Plessis (1964) Du Plessis, J. L. 1964. Some observations and data in thoroughbred breeding. J. S. Afr. vet. med. Ass., 35: 215–221. [Google Scholar] in South Africa, recorded a rate of 14%, while more recently van Niekerk (1965) van Niekerk, C. H. 1965. II. Early embryonic resorption in mares. J. S. Afr. vet. med. Ass., 36: 61–69. [Google Scholar] , in the same country, reported a very high rate of foetal death between 25 and 31 days of gestation in mares on low protein veld grazing. This paper describes foetal losses during pregnancy from mares examined in the Hunter Valley, Australia, between 1957 and 1962 and covers 2,562 individual pregnancies.

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