If you run a smaller sheep enterprise, you may not want to keep a tup of your own. Instead, you may be able to hire or borrow one from a neighbouring farmer. If ewes are well prepared for breeding and cycling effectively, a tup can serve 3-4 ewes a day. The recommended ration of tups to ewes is between 35 to 50 ewes per tup. So, if you have less than 50 ewes, a single ram lamb should be sufficient and, in some cases, breeders may even be willing to lend you one, to confirm that he is fertile.
If you are breeding pedigree stock, your breed society may be able to help.