[candyraver69]

I've seen some healthy odd-eyes have healthy litters but also heard the horror stories of people losing 1/2 to whole litters to megacolon. It's especially important not to breed high white into hairless because somehow that has an especially bad success rate. down-under markings also cannot be bred to high whites (although I doubt these show up for feeder access do to the rarity).

your best bet is to avoid any rat with white patches on the head or odd-eyes when breeding feeders since you aren't keeping pedigrees to tell high white from recessive blazes.

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super small rats could be malnourished but there is also the possibility of dwarfs? Full grown they are slightly larger than gerbils. if they are dwarfs it's recessive so with a lot of inbreeding you would be seeing more pop up if you breed them which may be undesirable for feeders.