The cow is Ushi in Japanese. Cattle are also Ushi.
When we call the female cow that is cattle, it’s Meushi(雌牛). A male cow that is a Bull is Oushi (雄牛).
Ano Bokujou niha ushi ga takusan iru
“There are a lot of cows in that ranch.”
Beef is Gyuniku in Japanese, and Gyu also makes sense.
Beef and rice called Gyudon (牛丼) is very famous in Japan and sold at a reasonable price for eating out. Typical shops are Yoshinoya (吉野家), Matsuya (松屋), and Sukiya (すき家).
Kyou ha gyuniku ga tabetai kibun dana
“I feel like eating beef today.”
Wagyu is a cow produced in Japan.
moo moo モーモー (moo)