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I used lab blocks for about a year many years ago and switched because my mousies didn't seem to like it very much. Later, I learned about corn being carcinogenic to meeces and switched to a corn free (not to mention added sugar free) diet.
 

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Eliminating corn from my meeces' diet eliminated the occurrence of tumors, and reduced skin, eye, and ear problems. Any of these problems will shorten the life of a mousie, or in the case of tumors, end it. Lab mice are not bred for longevity, with the exception, of course, of those that are specifically used for longevity studies. Corn is a common filler in many kinds of pet food because it is bulky and cheap and the animals will eat it. It is, however, one of the most common causes of allergies and digestive problems, especially in dogs and cats.

It is my understanding (I'm still trying to find the reference for this-I think the site is no longer up) that corn mixed with the mousies' digestive acids creates a carcinogenic substance (probably nitrosamines). I discovered the wisdom of removing corn from my meeces' diet without having read anything about it beforehand. My mousies were on a diet of whole grains and seeds supplemented by dry cat food for several years after I quit using lab blocks. I noticed that a lot of the meeces were leaving the corn uneaten, so I stopped buying it. Within a half a year, I noticed a drop in the incidence of the health problems mentioned above. 'Aha! thought moustress' let's try a corn-free dry kibble!

Okay, this worked! 99% reduction in cancerous tumors and 80% reduction in skin, ear, and eye problems. I could have done a double blind test, but I couldn't do that to any of my animals when it seemed so clear what was going on. BTW, there are similar problems with peanuts and sunflower nuts. In addition to the digestive conversion of corn and acids to nitrosamines, there are problems with contamination of all three, corn, peanuts, and sunflower nuts, especially the lower quality used in pet foods and bird seed mixes, with aflatoxins or other fungal elements.

I did reintroduce peanuts and sunflower nuts, and started seeing tumors again. This might be deemed apocryphal, except for the fact that I have lines of meeces up to eight years standing, and I have a couple of hundred at any one time.
 
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