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S ELECTIVE advantages for fertility was mated to several females by artificial and hatchability of different chicken insemination. Eggs were collected for a two blood group loci have been reported for several populations. The significant associations of these red blood cell antigens on fertility were found for the B (Allen, 1962) and L (De Silva, 1965) loci. Analysis of hatchability data revealed that heterozygous parents, whether sires or dams, generally out performed the homozygotes (Briles, 1953(Briles, , 1954Briles and Krueger, 1955;Fanguy et al., 1961). The present study is to record further evidence of the associations of blood group genotypes at the B locus, and new evidence for the A and E loci on the above mentioned traits in the parents, based on their blood type. MATERIALS AND METHODS Two inbred lines of Single Comb WhiteLeghorns, the Ml-L (large egg size) and Ml-S (small egg size), were utilized in this study. These lines were derived from a common line, called Ml, and selected for five generations in order to obtain large and small egg size birds. Individuals of the 1965 and 1966 generations were blood typed with reagents for the A, B and E blood group systems. In order to avoid any influence of preferential mating one male

The study was conducted to compare performance and abdominal adipose cellularity in broilertype female progeny of commercial broiler breeder sires and White Plymouth Rock (WPR) dams, and in the WPR females. Nine hundred and eighty three WPR and 816 crossbred (CB) female progeny were fed diets containing 13 MJ ME/kg" 1 and 20% CP ad libitum and body weight gain, feed intake and feed conversion, breast angle, carcass weight, abdominal fat weight and adipose cellularity were determined at 58 days of age.Body weight gain and feed intake were significantly higher (P<0.05) by 15.3 and 18%, respectively, in the CB than in WPR progeny. Mean breast angle, carcass weight, abdominal fat weight and total lipid in abdominal fat pad were also 12, 13.5, 33 and 42.8%, respectively higher (PO.05) in CB than WPR progeny. The CB progeny had significantly more fat cells of 230 to 290 pm in diameter than WPR progeny (0.31 x 10 7 vs 0.12 x 10 7 ).Negative and highly significant (PO.01) correlations were observed between abdominal fat cell size and total fat cell number in abdominal fat tissue of respectively) suggesting that adipocyte hyperplasia and hypertrophy were contributing factors to adipose tissue growth. Although the CB progeny outperformed WPR progeny, they however accumulated more abdominal fat and total lipid and had more and larger adipocytes.

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OLLOWING the report by BORDET (1898) that the serum of one species of F animal would often agglutinate the cells of other species, other workers observed individual differences in the cellular antigens of man (LANDSTEINER 1900), goats ( EHRLICH 1900) and cattle (TODD and WHITE 191 0). LANDSTEINER and MILLER (1924) detected individual differences in the cellular antigens of chickens by absorbing antichicken serum produced in rabbits with the blood cells of individuals. TODD ( 1930) produced isoagglutinins by immunizing one chicken with the blood of another, and as a result of further experiments proposed (1931) that there existed individuality of the blood cells of a species. However, both KOZELKA (1933) and WIENER (1934) postulated that a restricted number of antigenic substances could explain the results of TODD.Two multiple allelic series of genes affecting cellular antigens of the chicken were described by BRILES, MCGIBBON and IRWIN (1950). Evidence was presented for the existence of nine alleles at the "A" locus, and for five alleles at the "B" locus. A few tests for linkage of genes at either locus with the gene for dominant white ( I ) disclosed no significant association. However, BRILES, C., BRILES and QUISENBERRY (1950) noted a crossover frequency of 39.8 percent between the gene for crest ( C r ) and one affecting an antigenic substance called X,, which seemingly belonged in the A system. Since the genes I and Cr are linked with 12.5 crossover units (WARREN and HUTT 1936), linkage of the genes in the A system and I should be demonstrable. Two linkage groups of genes for cellular antigens in the chicken have been described by SCHEINBERG (19561, one of which may belong to the A system of BRILES, W., BRILES and QUISENBERRY (1950). Two other loci, D and E , with genes affecting cellular antigens in chickens have been reported by BRILES (1951 and1956). The present evidence suggests that the A and E loci are linked by about one crossover unit or else they are one system controlled by a complex single blood group locus (BRILES 1958). This paper describes the serological and genetic relationship of chicken red blood cell antigens produced by genes at the A , B, D and E loci. Additional alleles have been demonstrated at the A and E loci which provide more data on the relationship of the two systems.