“cow / cattle” in Japanese is 牛, read gyuu, ushi (ぎゅう, うし). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 牛乳 (cow's milk).
What does 牛 mean?
牛が くさを たべる。
Same sound, different character — the classic trap. Compare them side by side: