A cross-sectional study of serological levels of minerals in lactating dairy cows of Paraná, Brazil
DOI:
https://doi.org/10.5380/avs.v30i2.97307Palavras-chave:
macrominerals, microminerals, serology, deficiencyResumo
Serum macro- and microminerals (copper (Cu), iron (Fe), zinc (Zn), calcium (Ca), phosphorus (P), and magnesium (Mg)) were measured in lactating dairy cows managed under pasture-based and confinement-based systems in the state of Paraná, southern Brazil. The cross-sectional study was performed with 323 lactating cows, aged ≥2 years, from 34 dairy herds, 18 counties and 4 regions of Paraná. The cows were classified into two groups: Group 1 (G1, n=208) consisted of cows raised in confinement systems, while Group 2 (G2, n=115) included cows from pasture-based herds supplemented at feed troughs. Biochemical analyses were performed by spectrophotometry using commercial kits. The mean values found were as follows (G1 and G2): Ca = 8.1 ± 0.9 mg/dl; P = 6.1 ± 1.2 mg/dl; Mg = 2.3 ± 0.4 mg/dl; Cu = 83.6 ± 18.8 μg/dl; Zn = 94.0 ± 23.4 μg/dl; and Fe = 129.2 ± 44.2 μg/dl. The most prevalent deficiency was Ca, whereas the macromineral with the lowest prevalence of deficiency was P. Most dairy cows evaluated were not at risk of Cu intoxication. G2 had a lower mean serum mineral and a higher number of cows considered deficient than G1, with the exception of Mg. Even presuming that dairy cattle are better nourished than beef cattle the conclusion is that dairy cows in Paraná are at risk for mineral deficiencies, including Fe. This emphasizes the need for diagnostic monitoring to identify the affected cattle and herds in order to optimize animal health and production.
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