Determination of copper and zinc concentrations in Brazilian ingredients and commercial foods for dogs and cats - Pedreira, Raquel Silveira; Zafalon, Rafael Vessecchi Amorim; Rodrigues, Roberta Bueno Ayres; Risolia, Larissa Wunsche; Vendramini, Thiago Henrique Annibale; Rentas, Mariana Fragoso; Pontieri, Cristiana Fonseca Ferreira; Balieiro, Júlio Cesar de Carvalho; Brunetto, Márcio Antônio (Congress of the European College of Veterinary and Comparative Nutrition, 2020)