Abstract
Coturnix (Marks and Lepore, 1968) and chickens (Marks, 1969) fed thiouracil during the growing period had higher fertility than nontreated controls. While no improvement was observed in the fertility and egg production of adult chickens fed thiouracil (Shaffner and Andrews, 1948; Andrews and Schnetzler, 1945; McCartney and Shaffner, 1950), the thyroid gland has been shown to influence ovarian function and reproduction in other species (Weichert, 1930; Jones et al., 1946; Ershoff, 1945). Marks (1969) postulated that the beneficial influence of feeding thiouracil may be due to its action prior to sexual maturity. The experiment reported in this note was conducted to determine the influence of adding thiouracil to the diet of the growing turkey on subsequent fertility.Three hundred sexed Broad Breasted White turkey poults were obtained from a commercial hatchery on February 28, 1969. Day-old poults were wingbanded and randomly assigned to two treatment groups of 50 males and…
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