Study on the effects of in-feed inclusion of zeolite (clinoptilocite) on the health status and the performance of dairy cows
Abstract
The objective of the present study was to investigate the effect of the dietary supplementation of two levels (1.25 and 2.5% of the concentrate feed) of a natural zeolite, clinoptilolite, on the health status and performance of dairy cows. Fifty-two clinically healthy Holstein cows were used in the experiment. They were randomly assigned to one of three groups according to their age, parity and date of parturition. The first two groups were served as the experimental groups (Groups A and B) and the third (Group C) served as the controls as follows: Group A: was comprised of 17 cows that were fed a concentrate supplemented with 1.25% clinoptilolite. Group B: was comprised also of 17 cows receiving a concentrate with 2.5% clinoptilolite. Group C: was comprised of 18 cows that were fed the basal ration that did not contain any clinoptilolite. During the dry period all cows were receiving 20 kg corn silage, 2 kg molasses and 2 kg concentrates per day, whereas in the lactation they were rec ...
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