Genetic Analysis of Free Plasma Amino Acids in Pure Strains of Mature Chickens

Genetic Aspect of Free Plasma Amino Acids in Poultry

“…These results have been presented by Mainville (1971) for the blood analysed on the males of generation 0 and generation 1, and by Desmarais and Pare (1972) for the females of generation 1.…”

“…The coefficients of heritability estimated The free plasma amino acid level is a very from the sire component especially those difficult criteria to measure, very complex computed from the 125 days age groups agree, analytical procedures have to be followed, up to a certain extent, with those estimated many factors related to the experimental previously (Desmarais and Pare, 1972) from animals have to be taken into consideration the regression of progeny means on the per-and many of the data had to be corrected formance of their sire. The frequency dis-for many sources of error connected with tribution of these coefficients of heritability the analytical procedure.…”

“…At the age of 18 weeks they were put in individual laying cages and fed a commercial ration until the end of the experiment. At the time of sampling it was decided to analyse only those birds coming from the 42 hens that were previously studied by Desmarais and Pare (1972). Three hundred and eighty-five hens were thus sampled at 125 days of age.…”

“…A possible single gene effect was advanced to explain the variation in the level of free plasma threonine between the two lines. More recently, Desmarais and Pare (1972) have observed that White Leghorn chickens from different lines had a specific free plasma amino acid pattern. These findings are particularly relevant in view of the fact that much genetic research is now oriented toward the investigation of the relationship between physiological, biochemical or metabolic products to the productive efficiency of farm animals.…”

Avian Physiology

“…data on very young chicks, Zimmerman and Scott (1967) may be consulted, and levels for adult cockerels have been tabulated by Ohno and Tasaki (1972) and Desmarais and Pare (1972). The latter authors showed differences in individual plasma amino acid levels in different strains of adult chickens, indicating that heredity plays an important role in the free plasma amino acid levels of mature chickens.…”