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.
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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