For breeding, the number of ewes per ram is

For breeding, the number of ewes per ram is 40 - 50.
Fertile adult rams can serve at least 5 ewes per day, so over a 34 days breeding season, one ram could theoretically service over 150 ewes.
One mature ram can breed with up to between 35 and 50 ewes every year. A ram that is between a yearling and five years old can usually breed with between 25 and 50 ewes. Even a well-matured ram lamb can mate with between 15 and 30 ewes.