The phrase "be bred" refers to the process of reproducing and raising animals or plants in a controlled environment. There are several synonyms one can use to convey this concept, depending on the context. For example, the term "be raised" can be used to describe the rearing of animals or plants for commercial or personal purposes. Additionally, the phrase "be propagated" can be used to describe the cultivation of plants through seeds or cuttings. The word "be cultivated" can also be used to describe the process of nurturing and tending to plants. In conclusion, the use of these synonyms can help add variety and specificity to one's writing or conversation.