Cobalt Intake Research Articles

Some Relationships Between Trichostrongylid Infestation and Cobalt Status in Lambs: III. Trichostrongylus Axei and Ostertagia Circumcincta Infestation

Two experiments with lambs reared under worm-free conditions and fed on low cobalt diets are described. In the first experiment, a group of cobalt-supplemented lambs harbouring a worm burden consisting of Ostertagia circumcincta superimposed on a long-standing Trichostrongylus axei infestation had significantly lower serum vitamin B 12 levels than cobalt-supplemented lambs some of which were worm-free while others harboured only a recently-acquired O . circumcincta infestation. In the second experiment lambs which were infected with O . circumcincta , and in which cobalt deficiency was kept at a subclinical level, showed higher egg counts, lower haemoglobin concentrations and poorer weight gains than similarly infected lambs receiving adequate cobalt. The results indicated that the effects of low cobalt intake and a mild to moderate O . circumcincta infestation were additive.

Zinc Metabolism of Young College Women on Self-Selected Diets

This study was undertaken to determine the cobalt intake in food and milk, and the excretion of cobalt in the urine and feces of young college women living in the home management house at the North Texas State College and consuming a self-selected diet.

Certain Trace Elements in the Feeds, Organs, and Tissues of a Selected Group of Repeat Breeding Cows in Northeastern Wisconsin

Summary In an effort to determine the relationship of trace minerals to the repeat breeding cow problem, a study of the distribution of manganese and cobalt in the feeds fed the cows from problem herds and the distribution of cobalt and manganese in certain tissues and organs of problem cows has been made. It is evident that no single cause was responsible for the repeat breeder cow from these herds. Low blood plasma ascorbic acid values were found to exist. There was definite evidence of low or marginal cobalt intake associated with many of these problem herds. The manganese concentrations of the feeds from these farms was on the low side of the normal range, while ovarian concentrations were definitely low. It appears from these data that trace minerals have little if any direct relationship to the repeat breeding cow problem, although this possibility is not precluded by the data.