tailieunhanh - Báo cáo khoa học: "Levels of lead in mineral salt commercial mixtures for beef cattle"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Levels of lead in mineral salt commercial mixtures for beef cattle | J. Vet. Sci. 2003 4 3 235-238 JOURNAL OF Veterinary Science Levels of lead in mineral salt commercial mixtures for beef cattle Wilmar Sachetín Marẹal Paulo Eduardo Pardo1 Marcos Roberto Lopes do Nascimento2 Evandro Brandalize Veras and Aleksey Machado Moreno Veterinary Clinic Department Londrina State University CP 6001 Londrina - Parana CEP 86051-970 Brazil 1 Unoeste Presidente Prudente São Paulo Brazil 2National Commission of Nuclear Energy Pogos de Caldas Minas Gerais Brazil Lead concentrations was measured in samples of mineral mixtures used in beef cattle feed in the states of São Paulo Paraná Mato Grosso and Mato Grosso do Sul Brazil. Lead content was determined by inductively coupled plasma atomic emission spectrometry. Of the 60 analyzed samples 21 had values greater than 30 ppm range less to 460 ppm which is the maximum concentration recommended 3 14 . These findings show the necessity for careful industrial monitoring because some mineral mixtures contain sufficient lead to cause toxicity in animals. Key words lead beef cattle mineral salt Introduction The increasing commercialization of mineral salt mixtures for animal ingestion in Brazil is the main reason why the mixture industry has to reduce costs with the aim of winning a market and thereby guaranteeing its future business. Even with the concept of total quality some aspects have been relegated to second place such as the sources of raw materials that comprise mineral salt mixtures in order that they are chosen at the most accessible price exclusive of imports. This facet has become a concern among nutritionists clinical veterinarians and technicians oriented towards health and animal production because it is believed that some new mineral formulations can be contaminated by toxic elements above all by heavy metals and radioactive substances. For that reason an investigation research project was launched to evaluate the level of pollutants in mineral formulations used in Brazilian cattle feed .