Just chicken being the 1st ingredient and being mainly water is true. That is why many top manufactures use chicken MEAL as their 1st ingredient where all that water is removed. Chicken MEAL and any protein MEAL is what is key to look for and has all the glucosamin and essentials in it. BY PRODUCTS= disregarded NON-HUMAN grade parts, can include, anything for diseased animal parts, dogs, cats, rotting parts etc.
WIKIPEDIA: Animal by-products are
biodegradable wastes consisting of
animal carcases, parts of animal carcases, products of animal origin which are not intended for human consumption, includes catering waste (all waste food from
restaurants, catering facilities, central
kitchens,
slaughterhouses and household kitchens).
A
by-product is a secondary or incidental product deriving from a
manufacturing process, a
chemical reaction or a biochemical pathway, and is not the primary product or service being produced. A by-product can be useful and
marketable, or it can have negative
ecological impact.
[edit] Animal sources[LIST][*]dried
blood and
blood meal - from
slaughterhouse operations[*]
chicken by-product meal - clean parts of the carcass of slaughtered chicken, such as necks, feet, undeveloped eggs, and intestines.[*]
chrome shavings - from a stage of
leather manufacture[*]
collagen and
gelatin - from the boiled skin and other parts of slaughtered livestock[*]
feathers - from
poultry processing[LIST][*]
feather meal - from
poultry processing[/LIST][*]
lanolin - from the cleaning of
wool[*]
manure - from
animal husbandry[*]
meat and bone meal - from the
rendering of animal bones and
offal[*]
poultry byproduct and poultry meal - made from unmarketable poultry bones and offal[*]
poultry litter - swept from the floors of chicken coops[*]
whey - from
cheese manufacturing[*]
fetal pigs[/LIST]