Black Australorp males were mated to females of a White Leghorn selection line and a control line, seven generations after these two lines originated from the same base population. The mean half-year and total egg production in the selection line were 22.4 and 44.7 eggs higher than the control mean. The cross of the selection line also had a higher egg production than the control cross but only about 30% of the’ superiority of the selection line was carried over to its cross progeny.

D. G Poggenpoel

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 81–83, 1990
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