A frozen-thawed in vitro-matured bovine oocyte derived calf with normal growth and fertility.
The growth and fertility of a female calf obtained from a frozen-thawed bovine oocyte was assessed. The birth weight of the calf was lower than the mean birth weight of calves from in vitro fertilized embryos (IVF-controls) and calves obtained by artificial insemination (AI-controls). The growth rate of the calf up to 6 months was slower than that of the IVF-controls, but similar to that of the AI-controls. When the calf developed into a heifer (200 kg), she was inseminated with frozen semen and 280 days later delivered a male calf. The chromosoms of this cow were normal. These findings suggest that the growth and fertility of the calf derived from the frozen oocyte are normal.
Otoi
T
T
Tokushima Prefectural Beef Cattle and Swine Experiment Station, Japan.
Yamamoto
K
K
Koyama
N
N
Tachikawa
S
S
Suzuki
T
T
D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight; D002417:Cattle; D015925:Cryopreservation; D005260:Female; D005298:Fertility; D005307:Fertilization in Vitro / Q000662:veterinary*; D006128:Growth; D007315:Insemination, Artificial / Q000662:veterinary; D007621:Karyotyping; D008297:Male; D009865:Oocytes / Q000166:cytology* / Q000502:physiology*; D012016:Reference Values