EFFECT OF LACTOBACILLUS-ACIDOPHILUS SUPPLEMENTATION OF MILK REPLACER ON PREWEANING PERFORMANCE OF CALVES

Forty Holstein-Friesian calves were used to evaluate the effect on you ng calves of daily dietary supplementation with Lactobacillus acidophi lus. Calves were randomly assigned at 2 d of age to one of two treatme nts; 1) milk replacer with no additives or 2) milk replacer supplement ed with 1 mi (5 x 10(7)) of viable L. acidophilus bacteria at each of two feedings per day. Milk replacer was reconstituted to 12% DM and fe d at 10% of BW/d for the duration of the 6-wk trial. A commercial star ter pellet was offered for ad libitum intake from 7 d of age. Treatmen t had no effect on actual BW at any stage or on total BW gain; however , average daily gain during wk 2 was affected by L. acidophilus supple mentation. Calves receiving L. acidophilus maintained initial BW, and the control calves lost BW until 2 wk of age, at an average rate of 11 2 g/d. Starter intake, total DMI, feed efficiency, and occurrence of d iarrhea were unaffected by treatment. Therefore, L. acidophilus supple mentation for calves fed milk replacer may be beneficial during the fi rst 2 wk of life.