| Popis: |
ALTHOUGH iodine is an essential dietary element for poultry, toxic effects have been observed with above normal levels in the diet of chickens. Decreased egg production, decreased egg size, prolonged incubation periods, enlarged thyroids of chicks, and wiry down of chicks have been reported (Schmidt, 1932; Asmundson et al., 1936; Wilgus et al., 1953). A recent study has confirmed these findings (Perdomo et al., 1966). In addition, it was observed that with 5000 p.p.m. added dietary iodine, in the form of potassium iodine, production ceased within one week. With 2500 p.p.m. added iodine production ceased in 90% of the hens. Hens resumed laying within 7 days after the iodine was removed from their diet. Arrington et al. (1967) reported that hens were more severely affected than pullets. Egg production ceased in pullets and hens fed 5000 p.p.m. iodine, and in hens fed 2500 or 1875 p.p.m. iodine. Egg production following . . . |
