A number of Lyme Park’s fallow deer have had to be put down after falling ill.
Up to 100 wild deer have either died or have had to be euthanised since last winter, after succumbing to a liver fluke infection - a parasite which attacks the liver.
The affected animals are a breed of fallow deer.
The park’s 380 red deer meanwhile, which have been at the park as a herd for more than 600 years, are not affected and are continuing to thrive.
The National Trust, which runs the park, says that unlike the red deer, the fallow deer were not particularly well suited to Lyme’s environment and succumbed to the infection over time.
The park says it has been steadily reducing its wild fallow deer heard since last winter, in response to expert advice.
A National Trust spokesperson told the Manchester Evening News: