Thanks to Alan Donovan for the posting to the site http://www.fetchpup.com mentioned in the previous thread.Had a look at it and there is a very good thread for breeders mentioned in the'Training Articles' section and then clicking on to the Trained vs Inherited behaviour section, and especially note 6 of calm vs hyperactive natures. He alludes to the hyperactivity being bred into American Field lines in several places on his site and the problems being created.
After nearly 19 yrs of competing in Retrieving trials and breeding Labs for trials,show,and pet, I agree with so much of what is written by him. Must now find time to read ALL of his articles! I had forgotten about his site.
Thank you, Alan.
Maureen