Published in:
01-12-2012 | Original Article
Serum copper, zinc and iron status of various bovine categories on Holstein dairy cattle farms
Authors:
Vahid Noaman, Mohsen Rasti, Ahmad Reza Ranjbari, Edris Shirvani
Published in:
Comparative Clinical Pathology
|
Issue 6/2012
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Abstract
The aim of this study was to evaluate the blood serum concentrations of copper (Cu), zinc (Zn) and iron (Fe) in various bovine categories reared on industrial Holstein dairy farms. The study was carried out on 12 industrial Holstein dairy cattle farms in various region of Isfahan province, central Iran. Blood samples were collected from 240 dairy cows, 120 dry cows, 120 heifers and 120 calves. The Cu, Fe, and Zn contents were assessed in samples using atomic absorption spectrophotometer. Dry cows and heifers showed the lower Cu concentrations in comparison with dairy cows and calves (P < 0.05). Heifers and calves showed the higher Zn concentrations in comparison with dairy cows (P < 0.05). The serum Fe concentrations were significantly higher in heifers than those in dairy and dry cows (P < 0.05). Dairy cows showed higher Cu and lower Zn and Fe concentrations in comparison with the other categories (P < 0.05). Cu deficiency was diagnosed in 68% of the examined dairy cows (67% herds), 82% dry cows (92% herds), 75% heifers (92% herds) and 61% calves (58% herds). Only a small number of cattle were Zn- and Fe-deficient while on all farms, Cu deficiency was diagnosed in at least one of the bovine categories. In conclusion, because of the different physiological states of various bovine categories reared on Holstein dairy farms, mineral supplements (Cu, Zn and Fe) should be provided based on physiological requirements of individual bovine categories and the results of those diet analyses.