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EnglishUrolithiasis is a common disorder in the veterinary clinic and is considered as one of the most frequently cause of morbidity. This disorder is closely associated with urinary pH and nutrition plays a key role in the control of this disease, because through dietary manipulation it is possible to modify the urinary pH. Sulfur is considered macroelement with a strong influence on the acid-base status and may be crucial to control urinary pH in cats. The purpose of this study was to evaluate the effects of addition of different sources of sulfur (S) in the diet of cats on the urinary parameters and acid-base balance. Forty-two healthy adult cats were divided into 3 groups, and each group of 14 cats received 7 diets in a complete randomized block design. Calcium sulfate (CaSO4), DL-methionine (DLM) and methionine hydroxy analog (MHA) were added to a control diet in two levels (1.28g S/kg and 2.56g S/kg) to formulate 6 other experimental diets. The acid-base balance was evaluated by hemogasometry in samples of venous blood. The DLM at the highest level and MHA differed of the control diet in relation to urinary pH (P Key words: calcium sulfate; felines; methionine; methionine hydroxy analogue; urolithiasis portuguesA urolitiase e uma desordem comum na clinica veterinaria, considerada como uma das maiores causas de morbidade. Esta desordem esta intimamente associada ao pH urinario sendo que a nutricao desempenha papel fundamental no controle dessa doenca, pois atraves da manipulacao dietetica e possivel modificar o pH urinario. O enxofre e considerado um macroelemento com forte influencia no equilibrio acido-basico e pode ser crucial para controlar o pH urinario em gatos. O objetivo deste estudo foi avaliar os efeitos da adicao de diferentes fontes de enxofre (S) na dieta de gatos nos parâmetros urinarios e no equilibrio acido-basico destes animais. 42 gatos adultos saudaveis foram divididos em 3 grupos e cada grupo de 14 gatos recebeu 7 dietas em um delineamento de blocos ao acaso. O sulfato de calcio (CaSO4), a DL-metionina (DLM) e a metionina hidroxi-analoga (MHA) foram adicionados a uma dieta controle em dois niveis (1,28g S/kg e 2,56g S/kg) para formular outras 6 dietas experimentais. O equilibrio acido-basico foi avaliado por hemogasometria em amostras de sangue venoso. O DLM no teor mais alto e MHA diferiram da dieta controle em relacao ao pH urinario (P Palavras-chave: felinos; metionina; metionina hidroxi-analoga; sulfato de calcio; urolitiase

Different sources of sulfur in diets of adult cats on the urinary parameters and acid-base balance