Retention of tubal eggs in mares
Onuma, H.; Ohnami, Y.
Journal of Reproduction and Fertility. Supplement 1975(23): 507-511
1975
ISSN/ISBN: 0449-3087 PMID: 1060833 Document Number: 91543
Genital tracts from 227 mares slaughtered in various reproductive states were investigated to study egg retention in the oviducts. Eggs were found in 88.2% of 212 non-pregnant mares; the number/mare ranged from 0 to 21, and averaged 4.34. Retained eggs were twice as common in heavy (Anglo-Norman and Percheron) as in light (Thoroughbred and Anglo-Arab) breeds and were found more frequently in early than in late pregnancy. Eggs were not found in the oviducts of 2 anovulatory postpartum mares. Globular material, probably consisting of desquamated tubal mucosa, was frequently lodged in the distal region of the ampulla, and it appeared, to some extent, to cause the retention of some eggs.