Twelve antibiotic-sensitive strains of Arizona and ten of Salmonella were tested for ability to receive drug resistance in vitro from two multiple resistant, R factor-carrying strains of E. coli isolated from soiled eggs. Eleven of the 12 Arizona strains and 8 of the 10 Salmonella strains received the R factor from at least one of the donor E. coli strains. One of the donor strains transferred only part of its drug resistance pattern to some of the sensitive strains. ABSTRACTChicks were hatched from S.C.W.L. hens fed either a control ration or one supplemented with 1333 p.p.m. ascorbic acid. Chicks from each maternal ration were allotted to either a control ration or one supplemented with S00 p.p.m. ascorbic acid. Plasma total and free cholesterol were determined on blood obtained from 1, 7, 14 and 21 day-old chicks on each treatment. Day-old chicks from hens fed ascorbic acid had significantly higher (P < 0.01) plasma total and free cholesterol than did the controls. Plasma cholesterol levels decreased rapidly after hatching and plateaued at about 14 days of age in chicks from all treatments. Ascorbic acid supplementation did not significantly alter hatching or subsequent chick weight.

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