The effect of phenothiazine on cobalt-deficient and cobalt-dosed lambs

Abstract

Extract

Recently, Hunter (1953) has pointed out that, while there is as yet no experimental evidence to show that mineral deficiency in sheep is a cause of parasitic infestation, there is a general impression that in many areas both conditions occur together. In this connection it is of interest that early investigations (Webster, 1935) associated “Morton Mains Disease” of lambs in Southland. New Zealand, with abnormally high parasite counts. Later, it was shown (Askew and Dixon, 1936) that the primary cause of the disease was due to a deficiency of cobalt. Thereafter, interest in parasites as a possible contributing cause waned, since experience showed that if cobalt deficiency was corrected, lambsthrived.