Establishment of operationally parameters, proficiency test implementation and analytical methods using in animal nutrition critical evaluation / Estabelecimento de parâmetros operacionais, implementação de ensaio de proficiência e avaliação crítica de métodos analíticos empregados em nutrição animal

AUTOR(ES)

Gilberto Batista de Souza

DATA DE PUBLICAÇÃO

2007

RESUMO

Proficiency Testing for Animal Nutrition Laboratories was implemented with the objective to evaluate the variability of the analytical results and the performance of Brazilian animal nutrition laboratories. The structure and normalization were planning in accordance with analytical laboratories international protocols. Three years results are reported and discussed. A number of 43 laboratories, from state researches institutes, federal and state universities, and private companies participated of the trial. The performance of the next trial were evaluated: dry material, digestibility "in vitro" of the dry material, acid detergent fiber, neutron detergent fiber, crude protein, ether extract, lignin, ash, non protein nitrogen, insoluble nitrogen in neutron detergent, insoluble nitrogen in acid detergent, and the macro and micronutrients (Ca, P, Mg, K, S, Cu, Fe, Mn, Zn, and Na). The studied sample group, with different physical and chemical characteristics, was composed by forage, concentrate feed, and mineral mixing. To study the designated values, the consensus values provided by the laboratories were considered, and classical or robust statistic was used to define these parameters. The statistical design, based on z score, proved to be adequate to identify the laboratories performance, and the 76.9% value was observed as medium score of the laboratories with satisfactory concept. The ether extract, lignin and Na trials presented higher laboratorial varieties (cvEE = 42.7%, cvLignin = 59.1% e cvNa = 121%), considering the evaluated samples during the considered three years.

ASSUNTO(S)

nutrição animal metrologia química animal nutrition ensaio de proficiência proficiency test chemical metrology

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