Zinc Requirement of Holstein Bull Calves to Nine Months of Age

Open Access
Publisher Website
Google Scholar
Abstract
Fifteen Holstein bull calves were fed a semipractical type diet containing 8.6ppm of Zn of an as-fed basis until 29wk of age. Following this depletion phase, they were fed the same basal diet with the addition of various levels of Zn for 8 wk. As indicated by weight gains, feed consumption, testicle size and weight, testicle Zn content, blood Zn content, blood carbonic anhydrase activity, and clinical examination, calves fed the basal ration performed as well as those fed supplemental Zn. Under the conditions of this experiment, calves do not require more than 8.6ppm of Zn in their diet for normal performance to 9 months of age.
Keywords