The sampling methods were different, you've been told a hundred times!
And you don't have a clue what you are talking about since the sampling methods are not different.
Any fool would know that less DPSM and a closer B/D ratio WOULD NEVER harm herd health.
HOW COULD IT??
But the facts are breeding rates did decline and there is an obvious answer why they did. I have even stated the reason previously , but your inherent bias prevented you PGC supporters from understanding it. The answer lies in the harvest data inthe 2007 AWR. See if you can find it.