Presumptive evidence of a preovulatory sperm reservoir in the mare: morphological investigations using scanning electron microscopy

Scott, M. A.; Varner, D.D.; Liu, I. K. M.; Enders, A.C.

doi:10.1016/s0093-691x(02)00834-8

Cited by 3 publications

(1 citation statement)

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“…A reservoir for stallion spermatozoa in the mare has been suggested to be the caudal isthmus and/or the uterotubal junction (UTJ). 12 A functional sperm reservoir would allow spermatozoa to remain in a quiescent state for a prolonged period of time prior to a gradual release and transit proximally up the uterine tube for potential fertilisation of an oocyte. [13][14][15] Maintenance of stallion spermatozoa in a viable state within a sperm reservoir for several days during one oestrus period is understandable.…”

Section: Discussionmentioning

confidence: 99%

Delayed embryonic development or a long sperm survival in two mares—A registration conundrum

McCue

Matthews

Prell

et al. 2023

Equine Veterinary Journal

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BackgroundGenetic testing is required for the registration of foals of most equine breeds.ObjectivesTo describe two clinical cases of marked delayed embryonic development or delayed fertilisation in pregnancies generated by embryo transfer.Study designCase report.MethodsDonor mares were inseminated with semen from one stallion during one oestrous cycle and semen from a different stallion on the subsequent oestrous cycle. Embryo(s) were collected 8 days after ovulation during the second oestrous cycle and transferred into synchronised recipient mares. Genetic testing was performed to determine parentage of the two foals.ResultsFor both foals, DNA parentage testing excluded the second stallion as the genetic sire and confirmed that the first stallion, whose semen was inseminated on the previous oestrous cycle, was the actual genetic sire.Main limitationsRare event in horses; two clinical cases are described.ConclusionsIt is hypothesised that either marked delayed embryonic development or extended sperm survival occurred in the donor mares. Without genetic testing, parentage assignment based solely on breeding records would have been incorrect.

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Section: Discussionmentioning

confidence: 99%