Bekhorot 26: Handing Over the First-borns

To close the 3rd chapter: What if wool were plucked from an unblemished burnt-offering? What would the halakhah be regarding benefiting from that detached wool? The sacrifice might be postponed because of this question, and that can really complicate matters. And the new chapter begins -- with a new mishnah, and some basic questions about when the first-born is given the the kohen. "Small" animals should be given with a 30-day limit (or 3 months, depending on whom you ask) - sheep and goats. "Large" animals - that's cattle - have a 50-day limit.