Production of a Japanese Black calf designed genetically using reproductive technologies

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  • 遺伝子型をデザインした黒毛和種の効率的作出の試み
  • イデンシガタ オ デザイン シタ クロゲワシュ ノ コウリツテキサクシュツ ノ ココロミ

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Abstract

Our aim was to produce genetically designed Japanese Black calves efficiently using in vitro fertilization techniques of gametes from the parents that genotypes of growth hormone (GH) and stearoyl-CoA desaturase (SCD) were identified. Four cows, which were genetically superior in carcass weight and beef marbling but to be infertile for long time, were selected for the experiment from the herd of the Tochigi Prefectural Livestock & Dairy Experimental Center. The genotypes of the same genes were also determined for frozen semen samples purchased from the Livestock Improvement Association Japan (LIAJ), eight bulls of Japanese Black. Based on the genotyping results, combinations of ova and sperm were planned for yields of genetically superior calves. Ova were obtained from ovaries of the above four females when they were killed in the slaughterhouse in Utsunomiya-city. The resulting blastocysts, which should have the desired genotypes, were obtained using the previously reported IVM-IVF-IVC system. Of eight blastocysts transferred to four recipient females, two implanted in two females ; a live male calf was obtained from one of these pregnancies. When he was fed and fattened to the age of 31 months, his body weight was considerably higher than that the value which was predicted by the normal growth curve of the Wagyu Registry Association. We conclude that this approach would provide an efficient and relatively quick method to obtain genetically superior cattle for the beef industry.

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