sikamalc
Administrator
I have a couple of old sporting books, and one stag breeding book which often relates to English Park stags being moved up to Scotland to try and improve the quality of the heads and larder weight.I would say the main reason it returns good carcass weights is that it is surrounded by the Gulf stream which keeps it mild and means the grass growing season is generally longer than further east (like many of the southern Hebrides/peninsulars.)
To a much lesser extent there might be a 'good genes' angle, many forests were, of course 'improved' with English park or German blood.
I used to know a chap near Beaulie outside Inverness, who had around 4000 acres and bred some huge stags and released them onto his small hill. There was only a 6ft fence, and they often got out onto the neighbouring estate. Long gone now.