A Synthetic Medium for Propagation and Maintenance of Virulent Strains of Salmonella pullorum

Abstract

1283progeny of 27 single-sire matings with 161 dams over a period of four years. The heritability value estimated from paternal half-sister correlations was 29.3 percent. Results of the study indicated that selection based on the combination of individual performance and full-sister family averages is the most efficient method of improving egg production. REFERENCES Asmundson, V. S., 1938. The influence of various factors on egg production in turkeys. J. Agr. Res. 56:387-393. Asmundson, V. S., 1941. Differences in sexual maturity and egg production of turkeys. Poultry Sci.

Growth Rates of Salmonella Colonies

“…Interestingly, it does not appreciably reduce the lag period of S. pullorum but rather increases its rate of growth during the logarithmic phase and also the total cell crop. Growth stimulation of S. pullorum by yeast extract has been noted also by Gilfillan et al (1955).…”

ALTERATIONS IN THE NITROGEN EXCRETION PATTERN OF CHICKS INFECTED WITH SALMONELLA PULLORUM , ,

“…Also, observations were made as to whether the ornithine cycle participants had an inhibitory effect upon the organism. Cells were grown in synthetic medium (Gilfillan et al, 1955) or in chick sera. Arginine, citrulline, ornithine and urea were added to either medium in the amounts described for in vivo tests.…”

Growth-Factor-Dependent Strains of Salmonellae

“…There are, however, a number of Salmonellae which are unable to synthesize certain essential vitamins and amino acids and these must be supplied in the culture medium. The need of Salmonella typhosa for tryptophan (Fildes et al, 1933), of Salmonella gallinarum for vitamin B1, and of Salmonella pullorum for nicotinic acid, leucine, aspartic acid, cystine, and other amino acids (Johnson and Rettger, 1943;Gilfillan et al, 1955) has been described. Also, Lederberg (1947) has reported strains of Salmonella paratyphi A, S. paratyphi B, S. choleraesuis, S. enteritidis, S. dublin, and S. typhimurium which require for growth different combinations of vitamin B1, biotin, and a variety of amino acids.…”