Total, soluble and protein bound thiol values of the livers and kidneys and the soluble blood thiol values were determined using 10 strains of chickens selected for resistance or susceptibility to lymphoid leukosis and/or Marek's disease. Liver total thiol, and liver soluble thiol were higher (P<0.01 and P<0.05, respectively) in strains of chickens classified as resistant to Marek's disease than strains classified as susceptible. The soluble blood thiol was lower (P<0.01) in strains of chickens classified as resistant to lymphoid leukosis than in strains classified as susceptible. Individual strains of chickens varied in all thiol values.
ABSTRACTThe chorio-allantoic sacs of 10 and 11-day chicken embryos were injected with 46 Ca in order to assay their permeability to calcium. The retention of radioactive calcium by the sacs was found to be almost complete, since less than one-fourth of the administered dose escaped to the embryos during one week of incubation. This slow turnover of 45 Ca suggests that the endoderm of the chorio-allantoic membrane isolates the calcium of the allantoic fluid.