A viable foal obtained by equine somatic cell nuclear transfer using oocytes recovered from immature follicles of live mares.

The presence of heterogenous mitochondria from the host ooplast affects the acceptance of offspring obtained by somatic cell nuclear transfer. This might be avoided by obtaining oocytes from selected females, but is then complicated by low numbers of available oocytes. We examined the efficiency of equine somatic cell nuclear transfer using oocytes recovered by transvaginal aspiration of immature follicles from 11 mares.

Evaluation of foal production following intracytoplasmic sperm injection and blastocyst culture of oocytes from ovaries collected immediately before euthanasia or after death of mares under field conditions.

Objective: To evaluate the efficiency of foal production following intracytoplasmic sperm injection (ICSI) and blastocyst culture of oocytes from mares that died or were euthanized under field conditions.

Design: Prospective case series.

Animals: 16 mares (age, 3 to 19 years) that died or were euthanized for various causes.