Horse Species
نویسندگان
چکیده
The objective of this study was to determine the effects of age of mare and degree of asynchrony between donor and recipient on pregnancy rate (PR) to embryo transfer in recipient mares. Light-horse mares (n = 34) between 3 and 16 yr of age were used as recipients. Mares were subjected to an artificial photoperiod. Cyclic recipients were examined by palpation and ultrasound at regular intervals and daily during estrus. Reproductive tracts of recipients were examined for follicular activity, ovulation, presence of a corpus luteum, uterine edema, and fluid in the uterine lumen. When necessary, ovulation was hastened by administration of hCG. Fresh, cooled, or frozen semen from various stallions was used to inseminate donors. Embryos were recovered 7 to 8 d after ovulation by non-surgical uterine lavage. Embryos were transferred non-surgically to recipient mares between 5 and 9 d post ovulation. Recipients were examined for pregnancy by ultrasound on d 25 and 110. PR was analyzed by chi-squared analysis using the frequency procedure. Pearson correlation coefficients were used to determine the relationship between PR and level of asynchrony. Age of recipient had a significant effect on PR to embryo transfer. Mares age 3–9 yr (76.0%) had a higher (P < 0.02) PR at d 25 of pregnancy than mares age 10–16 yr (33.3%). Mares age 3–9 yr also had a numerically higher PR at d 110; however this difference was not significant. A negative relationship (P < 0.03) existed between asynchrony and PR at d 25 (r = −0.51) and d 100 (r = −0.39) indicating a decrease in pregnancy rate as asynchrony between the estrous cycle of the donor and the recipient increased in terms of days. Level of asynchrony ranged from 0 to 6 d. Results of this study indicate that PR to embryo transfer is lower in older recipient mares (age 10–16 yr) compared with younger mares (age 3–9 yr) and PR is decreased as asynchrony between the donor and recipient increases from 0 to 6 d.
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