One theory suggests that as the genetic material –DNA, reproduces itself in each new cell, the successive transcriptions become less accurate. The brain and the nervous system change as dogs age.
Older dogs have lighter, smaller brains than younger dogs. Apparently,the change is very significant in that the older brain sometimes is as much as 25% lighter. Biologists state that change does not necessarily mean that brain cells have been dying off and state that the process of aging is similar to that in humans.
Jacob Mosier, a veterinarian from Kansas State University in his observations ,says that age-related changes in dog behaviors are similar to those in humans. In a healthy young dog, neural information travels at 225 miles per hour. However, in older dogs this slows down to 50 miles per hour. Mosier says that the efficiency of nerve cells diminishes with age, just as it does in humans. Studying the way brain cells react by measuring the amount of blood sugar-glucose that is metabolized at any one time, will show how vigorously various brain cells react. The metabolic rate is a good measure of activity level.
An interesting study of how Beagles used glucose showed that by the time the dogs were three years of age, there was a steady decline in glucose utilization. It also showed that by the time the dogs were between fourteen and sixteen years, the glucose use had dropped to half of that of younger dogs.
Older dogs have a slower metabolic rate and a reduction in the oxygen supply to the brain. This will affect the dog’s long –term memory. However, some of the aging in certain parts of the brain, can be offset by providing enriched sensory experiences to your dogs and increased problem solving and making choices.
Can we nourish and slow down the aging process with antioxidants?
A study at the University of Toronto show that dogs with high levels of amyloids in their brains-protein deposits- have poorer memories and difficulties learning. Consuming high levels of antioxidants would thus slow down or even reverse the neural damage.
Norton Milgram, the psychologist that worked with the team of researchers at the University of Toronto, prepared a diet rich in antioxidants. They used young Beagles- younger than 2 and old Beagles-older than 9.Half the dogs from each group were put on the antioxidant diet, while the other half had a normal balanced dog food. Six months later all the dogs were tested-mental abilities where the dogs had to choose objects that were different from others.
The results showed that the antioxidant food seemed to reduce the effect of aging. More studies were later done combining cognitive enrichment 5-6 times per week with the benefits of an antioxidant diet. These results showed that these dogs scored the highest.
Adding fruits and vegetables such as citrus fruits, green peppers, broccoli, strawberries, raw cabbage and potatoes are part of the antioxidant diet for dogs and are extremely beneficial in slowing down the aging process in dogs. They can be steamed or parboiled with green leafy vegetables. Vitamin E enriched foods such as whole grains, fish-liver oil, nuts, wheat germ are also beneficial according to research. Beta-carotene and other carotenoids found in carrots, collard greens, cantaloupe, peaches, sweet potatoes should be added as well as selenium-fish, red meat, eggs and chicken to slow down the effects of aging.
Milgram summarized his results in this way: “ We say that we can teach an old dog new tricks because it’s possible to slow down, or partially reverse brain decline. Some dogs in our tests definitely become smarter.”
Thanks for visiting my blog.
Woofs & Wags!
Image Copyright Claudia Bensimoun
Text Copyright © 2012