Efeito de diferentes tratamentos anti-helminticos sobre o OPG e ganho de peso de bezerros bubalinos lactentes | Effects of different antihelmintic treatments on the number of eggs per gram of feces and on the gain in weight of nursing water buffalo calves [Gastrointestinal nematodes, Para State, Brazil] | Effects of different antihelmintic treatments on the number of eggs per gram of feces and on the gain in weight of nursing water buffalo calves

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