ABSTRACT
Twenty-six cows that developed positive milk tests for ketosis in early lactation were randomly assigned to one of three groups: control, propylene glycol (125 ml/d), or 125 ml of propylene glycol plus 12 g of niacin daily. Treatments were administered for 7 d. Changes in milk production, milk composition, and feed intake were similar for all three groups. None of the cows in any of the groups developed clinical ketosis. During the 14-d monitoring period from the start of treatment there were similar increases in blood glucose in all groups. Declines in plasma beta-hydroxybutyrate and free fatty acids over the period were also similar for all treatments. Results reinforce the concept that optimum feeding and management reduces the need for additives for ketosis control.
Subject(s)
Acidosis/veterinary , Cattle Diseases/drug therapy , Ketosis/veterinary , Niacin/therapeutic use , Propylene Glycols/therapeutic use , Acetates/blood , Animals , Blood Glucose , Cattle , Drug Therapy, Combination , Fatty Acids, Nonesterified/blood , Female , Hydroxybutyrates/blood , Ketosis/drug therapy , Lactation , Milk/metabolism , Propylene GlycolABSTRACT
Bulk tank milk samples collected from 175 dairy herds throughout Wisconsin averaged 466 micrograms of iodine per liter with 11% of the samples containing greater than 1000 micrograms per liter. From questionnaires on feeding and management, use of iodine supplements in feed was associated with increased iodine in milk. One gram of ethylenediamine dihydriodide was fed daily for 2 wk to dairy cows with a history of mastitis. Milk iodine increased from 210 to 6225 micrograms per liter. There was no significant effect on somatic cells, mastitis organisms, or incidence of clinical mastitis.