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      Effect of adding a mycotoxin-sequestering agent on milk aflatoxin M₁ concentration and the performance and immune response of dairy cattle fed an aflatoxin B₁-contaminated diet.

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      Journal of dairy science

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          Abstract

          This project aimed to examine the effects of adding 2 doses of a montmorillonite-based mycotoxin adsorbent on milk aflatoxin M(1) (AFM(1)) concentrations and the performance and innate immune response of dairy cows fed an aflatoxin B(1) (AFB(1))-contaminated diet. Eight lactating cows were used in a duplicated 4×4 Latin square design with 12-d periods. Treatments included the following: (1) control diet (C), (2) aflatoxin diet (T) containing C and 75 µg of AFB(1)/kg, 3) low-clay (LC) diet containing T and Calibrin A (Amlan International, Chicago, IL) added at 0.2% of the diet dry matter (DM), and 4) high-clay diet (HC) containing T and Calibrin A added at 1% of the diet DM. Milk production and DM intake were recorded daily and milk was sampled twice daily on d 5, 9, 10, 11, and 12 in each period. Blood samples were collected on d 5 and 9 of each period. Dietary treatments did not affect DM intake, milk yield, or feed efficiency. Even though cows were limit fed, feeding T instead of C reduced milk fat yield (0.67 vs. 0.74 kg/d) and milk protein concentration (3.28 vs. 3.36%). Concentrations of AFM(1) in milk of cows fed the T and LC diets were similar (0.57 and 0.64 µg/kg) and greater than those of cows fed the HC diet (0.46 µg/kg). Haptoglobin concentration was greater (22.0 vs. 14.4) and β(2)-integrin expression (220 vs. 131) tended to be greater in cows fed diet T instead of C, but values for cows fed LC, HC, and C did not differ. In comparison to C, feeding T increased the innate immune response and decreased milk fat yield and milk protein concentration, but feeding LC and HC did not affect these measures. Only the HC diet reduced milk AFM(1) concentration.

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          Author and article information

          Journal
          J. Dairy Sci.
          Journal of dairy science
          1525-3198
          0022-0302
          Oct 2012
          : 95
          : 10
          Affiliations
          [1 ] Department of Animal Sciences, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA.
          Article
          S0022-0302(12)00588-7
          10.3168/jds.2011-5287
          22901480
          f342f692-4068-46fe-8f15-70bf03252e9e
          Copyright © 2012 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.
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