Results of crossing the Rhode Island Red and White Leghorn Breeds of poultry
The Journal of Agricultural Science (Impact Factor: 0.65). 03/1944; 34(02):76 - 81. DOI: 10.1017/S0021859600019754
Cross-mating had little effect on hatchability of fertile eggs. The fertile eggs from Rhode Island Red dams hatched better than those from White Leghorn dams. A suggestion is made that this may be associated with a difference of porosity in the eggs of the two breeds.(Received February 28 1944)
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ABSTRACT: A special population segregating for the sex chromosome was developed to estimate the Z and W sex chromosome effects sampled from a Fayoumi (Egyptian) breed and a heavy‐breed synthetic population. Analysis of 2 years’ data from more than 3000 pullets indicate that both sex chromosomes influence age at first egg with the Z being the more important. Pullets with the heavy‐breed Z chromosome matured 17 d earlier and laid 5% more eggs than those with the Fayoumi Z. The heavy‐breed W chromosome showed a 7‐d advance in maturity but otherwise with no significant effect on egg production.Although this experiment was designed to estimate parameter differences between two breeds, the design can be generalised to estimate the distribution of genetic differences due to autosomes, sex chromosomes, heterosis and maternal influences both between and within avian populations.
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