Are You Feeding Enough Protein to Your Dog or Cat?
In living animals, there is a constant protein breakdown and synthesis. Adult dogs, adult cats, puppies, and kittens require protein in their diets to replenish amino acids lost in the skin, hair, digestive enzymes, and mucosal cells, as well as amino acid losses from regular cellular protein catabolism. For growth, puppies and kittens also need protein.
How Do We Determine Protein Requirements?
First of all, I would like to inform you about the standard methods of measuring protein in a food. The Kjeldahl method is the most commonly used standard method to analyze the amount of nitrogen, which helps us to determine the amount of protein.
Then, we need to know how much protein is taken by the body and also excreted. The difference in these numbers will tell us the protein requirement. Clinical feeding trials can allow us to determine protein intake needs in dogs and cats. We can find out the requirements for each breed. Such information is especially important for dogs because there is a lot of variation in size by breed. Cats do not vary greatly with different breeds.
Growing puppies and kittens require more protein than adults. Therefore, they need to take in more protein than they excrete.
Not All Proteins are Equal
Protein quality is key to support pet growth. Protein quality, amino acid composition, protein digestibility, and energy density are important.
Animal proteins are more digestible and have a suitable amino acid composition. Although plants like legumes have a high protein content, their benefits are diminished not only because of their amino acid profile but also because their bulk is primarily due to starch and fiber content.
Pet food manufacturers blend protein sources to provide a highly digestible amino acid profile. If a company is using plant proteins, they can also add lacking amino acids to the feed mixture to improve the amino acid profile.
Energy density is also key in pet food. If pets are not getting enough calories from fat and carbohydrates, they will use proteins to turn into glucose to support bodily functions. Therefore, pet food needs a wholesome composition of protein, fat, and carbohydrates.
Pets also eat fewer foods high in energy. Think about two pet foods, one of which is higher in fat with an equal percentage of protein. The pet will eat less of the higher-fat product because it is more energy dense. Thus, the pet will be getting fewer proteins.
Protein Requirements for Dogs and Cats
As discussed above, protein requirements for dogs and cats depend on protein quality. Due to variations in protein quality, the target for protein amount is not specific.
Adult maintenance dog food should contain protein from a high-quality source, comprising between 4 and 7 percent of metabolizable energy per gram. That being said, there is use of various proteins for pet food, and guidelines have been set by different authorities to give plenty of beneficial proteins despite raw material variation. These targets exceed the typical requirements of pets, thereby ensuring their safety.
In the USA, the National Research Council and the American Association of Feed Control Officials provide nutrition guidelines. In Europe, FEDIAF provides these guidelines.
The protein needs of cats exceed those of dogs, as cats require more protein for the upkeep of normal body tissues instead of for growth. This is attributed to the cat's liver not being able to reduce certain catabolic enzymes when there are fluctuations in dietary protein consumption.
Essential Amino Acids in Dog and Cat Nutrition
There are 10 essential amino acids for dogs and cats: arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
Most animals can produce arginine, but dogs and cats need it in the pet food. Deficiency in cats can be devastating.
Lysine is crucial for growth. Animal protein is a good source, but it is a limiting amino acid in cereals.
Methionine and cysteine are sources of sulfur. Cysteine can be produced from methionine, making it more important. Cats use it to synthesize felinine, which is excreted in urine to mark territory. Cysteine is also abundant in the hair.
Taurine can be made from methionine, but not enough for cats. Food has to be supplemented.
Things to Consider for Dogs and Cats
As a pet owner, it is important to watch the body development of young dogs and cat. Our goal is to ensure optimal physical development for young animals. As building blocks, proteins will assist you in that regard.
The energy content of pet food is greatly important. Dogs and cats will use protein sources to make up glucose during inadequate feeding. Be mindful of this and ensure that you provide the appropriate amount of energy and protein for the healthy growth of young pets.