Famous PetNutrition Wang Tianfei's new work: "Indiscriminate feeding kills dogs and cats" I can't believe in dog food and cat food series -
Why should we add "crude" before "protein" - called "crude protein"
We will definitely see the "Nutritional Value Table" on the back of the dog food or cat food packaging bag. "Under normal circumstances, the first one must be "protein". The protein here refers to "crude protein". Crude protein is also called "crude protein" and is a common indicator of the protein content of pet staple food. . Generally, the nitrogen content is measured by the Kjeldahl method and then multiplied by 6.25. Since the nitrogen content in protein is about 16%, the total nitrogen content of the pet staple food multiplied by 6.25 is regarded as the protein of the pet staple food. content. However, in addition to real protein in dog food and cat food, there are also different amounts of natural or artificially added nitrogen-containing substances (non-protein nitrogen). Therefore, the protein content detected by this method is only an approximation and not completely accurate. The actual protein content in dog food and cat food, so it is called "crude protein".
Don’t just look at the “crude protein” content, the key is to look at the “digestible protein” content
Digestible protein refers to the crude protein in pet dog food and cat food that can be digested by pet dogs The part that dogs and cats digest and utilize is the crude protein content of the staple food eaten by the pet minus the protein content in the pet's feces:
Digestible protein = crude protein content of the staple food consumed by the pet - pet Protein content in feces
This is the digestible protein content of pet staple food. You can also calculate the digestible protein of pet staple food by multiplying the crude protein content by protein digestibility:
Or
Digestible protein = crude protein content in pet food x protein digestibility
Digestible protein indicates that pet dog food and cat food can be digested by dogs The amount of protein digested, absorbed and utilized by dogs and cats is an important indicator for evaluating the protein quality of pet staple food. Among some protein raw materials in pet staple food, although some have high content, very few can be digested and absorbed by pet dogs and cats. For example, in the past (no longer used in pet food after 2008), they were listed as Feather meal, one of the protein raw materials, has a protein content of more than 78%, but it is mainly composed of indigestible keratin, and its digestibility is extremely low. If it is not hydrolyzed, the protein digestibility of feather meal will be very low for dogs and cats. Almost "0". Therefore, although feather meal is high in protein, it is a very poor protein source. Another example is soy protein among plant proteins. Although the content of soy protein is not high, generally about 43%, its protein digestibility for pet dogs can be as high as 87%. Therefore, soy protein is also a very good source of protein. Of course, the protein utilization of fresh meat and meat products is even better.
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