Bekhorot 54: Mixing and Matching

More on not combining most species for tithing -- with the explicit exception of sheep and goats. The biblical source for this brings us back to terumah (and ma'aser) on different species. Plus, the implications of actual "kilayim," mixtures of the different species -- and when that prohibition would be violated. Also, a new mishnah! On the distance that the flocks could be apart from each other and still join together for the count of the tithing: 16 "mil" [What's What: A "mil"].