How long is a Yisrael required to care for a bechor? With small livestock, until thirty days; and with large livestock, fifty days. R’ Yose says: With small [livestock] three months. [If] the Kohen said to him within this time, “Give it to me,” he may not give it to him. [If] it was blemished, [and] he said to him, “Give it to me so that I may eat it,” it is permissible. However, during the era of the Temple, if it was perfect [and] he said to him, “Give it to me that I may offer it,” it is permissible.  The bechor must be eaten within the year, whether it is perfect or blemished, as it is said (Deut. 15:20): “Before HASHEM your God you shall eat it year by year.”