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      Effects of addition of fluorine in diets differing in protein content on urinary fluoride excretion, clinical chemistry and thyroid hormones in calves

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      Revista Brasileira de Zootecnia
      Sociedade Brasileira de Zootecnia
      blood, cattle, concentrate, fluorosis, sodium fluoride, urine

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          Abstract

          In order to compare the effects of addition of fluorine (F) in diets differing in protein content on the urinary F excretion, blood profile and thyroid hormones, 30 crossbred calves (6-8 months) initially exposed to different protein levels were allotted into six groups in a 3 × 2 factorial design. The factors included three different levels of protein: normal (NP; 100%), low (LP; 75%), and high (HP; 125%) besides two levels of supplemental fluorine (as sodium fluoride) at 0 or 200 mg/kg diet. The animals were fed a wheat straw-based diet for 210 d. Feeding NP diets decreased urinary fluoride excretion, measured at 42 d intervals, compared with LP diets. Blood levels of hemoglobin and haematocrit, measured at 70 d intervals, were not affected by either protein or fluorine levels, but period differences were apparent. Serum levels of urea, alkaline phosphatase and F showed greater increase in groups supplemented with F than in those without it; however, serum calcium was higher in the latter. Serum tri-iodo-thyronine and thyroxine levels were higher in HP and NP fed calves than animals on LP diets, respectively. The animals fed LPF have higher urinary F as compared with animals fed NPF, but were not different from the group fed HPF. The blood and serum variables indicated that there is no extra protection against susceptibility to F toxicity upon feeding of 25 percent higher protein than requirements.

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          Most cited references58

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          Nutrient requirements of ruminants in developing countries

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            Minerals in animal and human nutrition

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              Trace Elements in Human and Animal Nutrition

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                Author and article information

                Journal
                rbz
                Revista Brasileira de Zootecnia
                R. Bras. Zootec.
                Sociedade Brasileira de Zootecnia (Viçosa, MG, Brazil )
                1516-3598
                1806-9290
                October 2013
                : 42
                : 10
                : 751-758
                Affiliations
                [01] Chuncheon orgnameKangwon National University orgdiv1College of Animal Life Sciences South Korea
                [02] Izatnagar orgnameIndian Veterinary Research Institute orgdiv1Division of Animal Nutrition orgdiv2Clinical and Pet Nutrition Laboratory India
                Article
                S1516-35982013001000009 S1516-3598(13)04201000009
                10.1590/S1516-35982013001000009
                b5c3b2b3-a472-4de0-a244-10c9976e8747

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 21 May 2013
                : 21 August 2012
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 60, Pages: 8
                Product

                SciELO Brazil

                Categories
                Ruminants

                blood,cattle,concentrate,fluorosis,sodium fluoride,urine
                blood, cattle, concentrate, fluorosis, sodium fluoride, urine

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