Bekhorot 53: Tithing the Flocks

Chapter 9! On tithing animals... and the verses from the Torah that prescribe this fairly broad mitzvah, throughout the world and regardless of whether the Temple stands. Sacrificial animals, however, are not part of the tithe. "Herds" (cattle and so on) cannot be tithed in a group that includes various species, however, when it comes to "flocks," even sheep and goat, can combine for tithing purposes. And not "new" and "old" together... Plus, diving deeper into combining species and into the old/new restriction, using a fortiori logic. Also, can the tithing of animals be compared to the tithing of grain and learn from the comparison? Maybe sheep and goats shouldn't be able to be tithed together either? But the term "flocks" is inclusive.