Selenium in soils, pastures and animal tissues in relation to the growth of young sheep on a marginally selenium-deficient area

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Abstract
Extract Selenium-responsive diseases of farm animals in New Zealand have been reviewed by Andrews et al. (1968) Andrews, E. D. 1965. Observations on the thrift of young sheep on a marginally cobalt-deficient area. N.Z. Jl agric. Res., 8: 788–817. [Taylor & Francis Online] [Google Scholar] . In sheep these may be manifested as infertility in ewes, as “congenital” or “delayed” white muscle disease in lambs, or as unthriftiness, a condition usually more apparent in young animals. As evidenced by weight responses of lambs to dosing with selenium salts, selenium-responsive unthriftiness has occurred widely in New Zealand ( Robertson and During, 1961 Andrews, E. D. , Hartley, W. J. and Grant, A. B. 1968. Selenium-responsive diseases of animals in New Zealand. N.Z. vet. J., 16: 3–17. [Taylor & Francis Online] [Google Scholar] ). Most investigations into selenium-responsive conditions, e.g., Cousins and Cairney, 1961 Cousins, F. B. and Cairney, I. M. 1961. Some aspects of selenium metabolism in sheep. Aust. J. agric. Res., 12: 927–943. [Google Scholar] ; Hartley, 1967 Drake, C. , Grant, A. B. and Hartley, W. J. 1960. Selenium and animal health. Part 2. The effect of selenium on unthrifty weaned lambs. N.Z. vet. J., 8: 7–10. [Taylor & Francis Online] [Google Scholar] ; A. B. Grant, pers. comm.) have related mainly to areas that could be described as severely selenium-deficient.

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