I'm not sure how your growth and loss will be counted. I am assuming the growth occurs before the slaughter.

Let the initial amount of sheep be

After the growth there will be

It is important to notice that the 10% slaughtered is based on the new amount:

This is going to be the initial value in the second year (the values of t are for the end of the year)

There is a pattern emerging here which is

To answer your question sub and