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The problem of duration of fertility is of importance where artificial insemination is widely practised in turkeys and the frequency of insemination bears on the level of fertility. The studies of Lorenz (1950), McCartney (1951) and Hale (1955) suggest that the average duration of fertility in turkeys is long enough that one need not inseminate more frequently than every two weeks. However, the results of Nestor and Brown (1966) indicate that an advantage in percentage fertility is gained by weekly as opposed to biweekly insemination after 10 to 15 weeks of egg production. This finding relates well to observations by Van Krey et al. (1967) who associated late season declines in fertility with an inability of the uterovaginal sperm glands to retain sperm in the oviduct. Many changes in the genetic constitution of turkey populations have accompanied selection for fast rate of growth and other traits. Duration of fertility has. . .
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G. W. Friars (1970) studied this question.
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