jnowack":5eetz1v5 said:I'm talking about the terminal lines and the maternal lines (the boars and the sows that are used to produce the terminal cross pigs. Are they F1's (first cross between two different pure breeds) or are the parents crosses also?
In most cases there AREN'T any pure breeds involved any more at all. They have created a composite and they breed those like they ARE a breed. Then they cross the maternal line sows with the paternal line boars to produce a terminal top hog. Every line is different. At some grandparent farms the boars and the sows of each line were the same. With others there were two grandparent lines that had to be crossed to produce the replacement gilts or boars.