You may, however, present as a freewill offering an ox or a sheep that is deformed or stunted, but it will not be accepted in fulfillment of a vow. (NIV)
For a freewill offering you may offer either a bull or a lamb which has some part too long or too short, but for [the payment of] a vow it shall not be accepted. (AMP)
Either a bullock or a lamb that hath any thing superfluous or lacking in his parts, that mayest thou offer for a freewill offering; but for a vow it shall not be accepted. (KJV)