1,164. First-Born Animals

176:8 Covered wagons, coaches and other vehicles for transporting people sometimes have wool linings that are shaatnez because they were likely sewn with linen threads. It is permitted to travel in such vehicles but one must be careful not to lean on the sides where there is shaatnez. One must certainly be careful not to sit on shaatnez cushions. Some authorities permit one even to sit on the cushions because they are made in such a way that they don’t surround a person on the sides.

177:1 If a Jew had a kosher first-born male domestic animal born to him, there is a mitzvah to sanctify it verbally as per Deuteronomy 15:19, "sanctify it to Hashem your G-d." Even if one did not do so, the animal is nevertheless automatically sanctified upon birth. We give this animal to a kohein, whether it's perfect or becomes blemished, and even if it was born with a blemish. However, we don't give it to the kohein while it's very small because this is not respect to the kohein. Instead, the owners wait for the animal to grow a little, namely thirty days for small animals (i.e., sheep and goats) and fifty days for large animals (i.e., cattle). If no kohein is available, the owner must tend to the animal until a kohein can be found.