Proceedings of the 5th International Symposium on EQUINE ...

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Havemeyer Foundation Monograph Series No. 3REFERENCESAguilar, J. and Woods, G. (1997) Embryo transfer inhorses: indications, technique and expectedoutcomes, in current <strong>the</strong>rapy in large animal.Theriogenol. 208-213.Gin<strong>the</strong>r, O.J., Doulas, R.H. and Lawrence, J.R. (1982)Twinning in mares: a survey <strong>of</strong> veterinarians andanalyses <strong>of</strong> <strong>the</strong>riogenology records. Theriogenol. 18,333-347.Gin<strong>the</strong>r, O. (1992) Reproductive Biology <strong>of</strong> <strong>the</strong> Mare.Basic and Applied Aspects. 2nd ed. Cross Plains,WI: Equiservices.McCue, P.M. (1996) Superovulation. Veterinary Clinics<strong>of</strong> North America. Equine Practice 12, 1-11.McCue, P.M. et al. (1999) Commercial embryo transferin <strong>the</strong> horse. in 18th Annual Convention. ColoradoSprings, Colorado.Pascoe, R., Pascoe, D. and Wilson, M. (1987) Influence<strong>of</strong> follicular status on twinning rate in mares. J.reprod. Fert. Suppl. 35, 183-189.Riera, F.L. (1999) Equine embryo transfer, in EquineBreeding Managment and ArtificialInsemination.Ed: J. Samper, W.B. Saunders Co:Philadelphia. 229-246.Squires, E. et al. (1987) Reproductive characteristics <strong>of</strong>spontaneous single and double ovulating mares andsuperovulating mares. J. reprod. Fert. Suppl. 35,399-403.Squires, L.L., McCue, P.M. and Vanderwall, D. (1999)The current status <strong>of</strong> equine embryo transfer.Theriogenol. 51, 91-104.83
Equine Embryo TransferEMBRYO RECOVERY RATES IN MARES WITHECHOGENIC PREOVULATORY FOLLICLESP. M. McCue, D. K. Vanderwall and E. L. SquiresEquine Reproduction Laboratory, Colorado State University, Fort Collins, Colorado 80523, USAINTRODUCTIONEchogenic particles may be noted in <strong>the</strong> follicularfluid <strong>of</strong> dominant follicles prior to ovulation insome mares. The goals <strong>of</strong> this study were todetermine <strong>the</strong> incidence <strong>of</strong> preovulatory folliclescontaining echogenic follicular fluid and compareembryo recovery rates following ovulation<strong>of</strong> echogenic or non-echogenic follicles.Reproductive records <strong>of</strong> 721 mares examined bytransrectal ultrasonography prior to breeding overa total <strong>of</strong> 1,694 oestrous cycles were reviewed.Embryo recovery data were recorded for 34 maresthat ovulated a single non-echogenic follicle or asingle echogenic follicle during oestrous cycleswithin <strong>the</strong> same breeding season. Non-echogenicand echogenic preovulatory follicles were noted in93.8% and 6.2% <strong>of</strong> <strong>the</strong> cycles, respectively.Embryo recovery rate per flush was significantlyhigher (P
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