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Thus, for some producers, it is commonplace to breed well-grown ewe lambs when they are 7 to 9 months of age. Other producers wait until their ewes are 18 months old before breeding them to lamb as 2 year olds.Different breeds of sheep reach puberty (sexually maturity) at different ages.ams. A healthy, mature ram can probably mate 100 (or more) ewes during a breeding season, though a ratio of 1 mature ram to 35 to 50 ewes is more common to make sure lambing is not too spread out. Seven to 8 month old ram lambs that have achieved approximately 50 percent of their mature size can be used for breeding.
1. A cow should be bred back after she has had a calf. The optimum time to breed her is 45 to 60 days after she has had a calf. In order to get her to calve on the same date as the previous years, allow for 80 to 90 days of rest before getting her bred again.epending on the breed of the heifer, most heifers will start to show the first signs of heat when they are between 9 and 22 months of age. 1  The rate of sexual maturity or puberty is determinate of genes and breeding.