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1 Department of Animal Sciences,
2 Department of Food Science and Human Nutrition,
3 Department of Statistics, and
4 College of Veterinary Medicine, University of Florida, Gainesville 32611
5 Roche Vitamins Inc., Parsippany, NJ 07054
Corresponding author: L. R. McDowell; e-mail: mcdowell{at}animal.ufl.edu.
Fifty-two multiparous Holstein cows were randomly assigned to receive 0 or 20 mg of biotin/d starting at an average of 16 d prepartum and then switched to 0 or 30 mg of biotin/d from calving through 70 d postpartum to determine whether supplemental biotin would affect cow performance, hepatic lipidosis, and plasma metabolites. Mean concentration of biotin in plasma sampled weekly was greater in cows fed biotin (4.3 vs. 9.4 nmol/L). Postpartum dry matter intake as a percentage of body weight (3.9% vs. 4.0%), milk production (35.8 vs. 34.8 kg/d), and milk fat concentrations (3.59% vs. 3.69%) were similar between treatment groups. Milk from biotin-supplemented cows tended to have a greater concentration of protein (2.73% vs. 2.83%). Concentrations of plasma nonesterified fatty acids were lower at wk 2 (652 vs. 413 µEq/mL) and 4 (381 vs. 196 µEq/mL) postpartum in cows fed supplemental biotin. However, mean plasma concentrations of ß-hydroxybutyric acid were not affected by biotin supplementation. Mean concentration of plasma glucose was greater for lactating cows fed supplemental biotin (63.4 vs. 66.6 mg/dL). Biopsies of liver were taken at 2, 16, and 30 d postpartum. The triacylglycerol concentration in liver (wet basis) tended to decrease at a faster rate after d 2 postpartum with biotin supplementation compared with control cows. The potential mechanisms that link improved glucose status and decreased lipid mobilization in cows supplemented with biotin warrant further investigation.
Key Words: biotin • energy • liver • milk
Abbreviation key: TAG = triacylglycerol
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