Soy isoflavone concentrations were measured in serum and urine samples primarily to verify food intake compliance and also to evaluate phytoestrogen systemic uptake and excretion. As expected, average serum and urine isoflavone levels reflected the difference in content of these compounds present in the respective diets. However, we did observe a relatively high variability in levels between dogs. This is likely the result of the opportunistic sampling protocol we employed resulting in variation in the sample collection time relative to the previous meal. Such opportunistic (or convenience) urine sampling has been used extensively for evaluation of compliance in human soy diet studies, showing good correlation between soy intake and urinary isoflavone levels. Data are generally normalized to creatinine content to account for differences in urine output. Reported urinary genistein, daidzein and glycitein concentrations average 1.2, 1.9 and 0.6 nmoles/mg creatinine (respectively) for people receiving a soy-based diet, which compare well to values determined for dogs in this study receiving the HID with average values of 1.2, 1.0 and 0.8 nmoles/mg creatinine at 12 months. Serum isoflavone concentrations in the dogs in this study also compare well to values reported for people. For instance, average maximum plasma genistein and daidzein concentrations of 298 and 654 nmoles/L (respectively) were recently reported for people that consumed a standardized soy beverage, compared with average values of 223 and 254 nmoles/L (respectively) for dogs receiving the HID. Consequently, the levels of exposure of the dogs in this study are comparable to studies in people evaluating the health effects of soy.
Hydrolyzed protein diets often feature chicken or soy as the protein source, with soy often preferred since few dogs have likely consumed soy protein as part of their former diet, so they are unlikely to be allergic to the soy protein. These proteins are usually paired with potato, rice or cornstarch as the carbohydrate source as these are less commonly used in commercial dog food production than other carbohydrates like whole kernel corn or wheat.
Soy nut butter? - Food & Nutrition Forum - Dogster
To the best of our knowledge this is the first study to evaluate the effect of dietary phytoestrogens on canine health, endocrine status and their effect on skin and coat condition, and behavior. Our results show that feeding dogs for one year with a strictly soy-based diet does not seem to have either immediate implication on canine health, skin and coat quality, or behavior. The results of the endocrine tests to evaluate the thyroid and adrenal function even considering the small number of dogs and the short term study, show that changes in their endocrine function might be present, as reported in other species, but these need to be confirmed with long term studies.
So I was wondering if you all knew: is soy bad for dogs
With so many pet owners trying different diets (like gluten or grain free), it’s only logical for them to eventually start questioning whether these ingredients like corn, wheat or soy should be omitted from their dog’s diet. This question puts many dog owners on the hunt for dog food brands that advertise specific “without” recipes, such as:
Soy milk is in no way a suitable replacement for a mother dog's milk