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If you look at the catalog from Aviagen they offer many different strains of meat chicken all with different growth profiles. They have graphs and tables and charts showing which strains do best in hot climates, cold climates, which will finish in 42 days versus 46 days... it's all very scientific. All the strains are numbered like you mentioned. Your commercial hatcheries then choose the line(s) they want to go with and sell them as "Cornish Crosses" to their retail customers.
If you look at the catalog from Aviagen they offer many different strains of meat chicken all with different growth profiles. They have graphs and tables and charts showing which strains do best in hot climates, cold climates, which will finish in 42 days versus 46 days... it's all very scientific. All the strains are numbered like you mentioned. Your commercial hatcheries then choose the line(s) they want to go with and sell them as "Cornish Crosses" to their retail customers.