4 sentences

1. 这头公牛的角非常大。

   zhè tóu gōng​niú de jiǎo fēi​cháng dà.

   This bull has very large horns.

   Source: Dong Chinese Dictionary

2. 那头公牛正在草地上吃草。

   nà tóu gōng​niú zhèng​zài cǎo​dì shàng chī cǎo.

   That bull is grazing on the grass.

   Source: Dong Chinese Dictionary

3. 你的公牛来了。

   nǐ de gōng​niú lái le.

   Your bull is coming.

   Source: OpenSubtitles

4. 兽医正在给那头小公牛进行阉割。

   shòu​yī zhèng​zài gěi nà tóu xiǎo gōng​niú jìn​xíng yān​gē.

   The veterinarian is castrating that bull calf.

   Source: Dong Chinese Dictionary