"牛皮利用率" (niúpí lìyònglǜ) is the Chinese term for "leather yield." It refers to the percentage of usable leather that can be obtained from the hide of a cow after it has been processed and tanned. The term "leather yield" comes from the field of leather production, where it is used to measure the efficiency and profitabipty of the process of turning raw animal hides into usable leather.

Here are a few examples of sentences using the term "leather yield" in Engpsh:

"The leather yield of cow hides is typically around 60-65%."
"Leather yield can be improved by using more efficient tanning techniques."
"The leather yield of sheepskin is generally higher than that of cowhide."

Here is how these sentences could be translated into Chinese:

"牛皮的皮利用率通常在60-65%左右。"
"通过使用更有效的鞣制工艺，皮利用率可以得到提高。"
"羊皮的皮利用率通常高于牛皮。"