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                                        color are recognized globally. These animals contribute to the mental health and wellbeing of children, adolescents and adults, and have become increasingly popular worldwide over the past decade. Most pet foods are commercially manufactured, although some people choose to prepare meals for their own pets by using animal-and plant-sourced ingredients. Thus, the global                                                                                                  Extrusion of meat and bone meal via high temperature and                                         are similar to those for omnivores (e.g., humans and pigs). However, in contrast to most breeds of dogs, cats have a very limited ability to synthesize taurine and arginine. Because taurine is present in animal products but absent from plants,                     supplements. This is consistent with the much greater            compared to ruminants and pigs. Dogs can synthesize arginine from dietary glutamine/ glutamate and possibly dietary proline, as well as arterial                          maintaining nitrogen balance. Compared with adult humans,                  for arginine.          dogs than humans to both directly supply exogenous arginine                     dogs. Cats have a very limited ability to synthesize citrulline                                                     emesis, ataxia, tetanic spasms and death. The higher protein            much lower ability to synthesize arginine in cats.         is cats > dogs > rats. Hydrolyzed feather meal is a very rich           protein products contain high concentration of arginine. Inclusion of hydrolyzed feather meal and other animal protein products in dry pet foods for dogs and cats can meet their high                                                 of dilated cardiomyopathy characterized by thin heart muscles and enlarged chambers in some breeds of dogs.                                           Young and adult cats have a limited ability to synthesize taurine from cysteine due to low activities of cysteine dioxygenase and cysteine sulfinic acid decarboxylase;                                     Those animal-derived proteins are abundant sources of both arginine and taurine for the diets of animals. For example, the content of taurine in common animal-derived foods (milligram                                                             should not be fed solely to either cats or some breeds of dogs.         they contain high amounts of either collagens (e.g., meat and                   hydrolyzed, their AAs are nutritionally available for both cats and dogs to use. For example, the content of the most                                              Dietary provision of hydrolyzed feather meal can spare energy and materials that would be needed for de novo syntheses of these AAs in animals, thereby reducing energy          (e.g., formaldehyde) and ammonia. Of note, cysteine, glycine and proline are crucial for the synthesis of hair proteins (e.g.,                              www.rendermagazine.com Render   53 


































































































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