BDPA - Bases de Dados da Pesquisa Agropecuária Embrapa
 






Registro Completo
Biblioteca(s):  Embrapa Meio-Norte.
Data corrente:  14/10/1997
Data da última atualização:  14/10/1997
Autoria:  VULICH, S. A.; HANRAHAN, J. P.; O'RIORDAN, E. G.
Título:  Pasture sampling for the estimation of herbage intake using n-alkanes: evaluation of alternative sampling procedures.
Ano de publicação:  1993
Fonte/Imprenta:  Irish Journal of Agricultural and Food Research. v. 32, n. 1, p. 1-11.
Idioma:  Inglês
Conteúdo:  Two experiments were conducted to i) assess the magnitude of sampling variation in estimates of n-alkane concentrations in herbage harvested by individual oesophageal fistulated wethers, and ii) compare animal-based (fistulated animals) and other pasture sampling procedures (clipping and hand-plucking) for the determination of herbage n-alkane concentrations. In the first experiment extrusa samples from oesophageal fistulated wethers, collected on 3 days per week for three l-week periods between mid-May and mid-July, were used to evaluate among-animal variation in herbage n-alkane concentrations. The second experiment, conducted in the autumn, compared n-alkane concentrations determined form oesophageal extrusa (pooled mateiral from four wethers), hand plucked and mechanically clipped herbage samples collected on 7 days over a 15-day period. Herbage n-alkane concentrations varied significantly (P<0.05) among weeks and among days within weeks, and among days, indicating the need for pasture sampling throughtou the experimental period. No significant differences were detected in the n-alkane concentrations among samples obtained by clipping, hand plucking and those based on pooled extrusa. There was also no difference in variability between the animal based and the non-animal based samples. The combined results from both experiments indicated that daily herbage samples, based on three or four extrusa samples or one non-animal based sample, yielded CVs of the order of 0.08, 0.1... Mostrar Tudo
Palavras-Chave:  Avalia?ao; Intake; N-alkanes; Pasture; Variation.
Thesagro:  Amostragem; Consumo; Forragem.
Thesaurus Nal:  sampling.
Categoria do assunto:  --
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Meio-Norte (CPAMN)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CPAMN6025 - 1ADDSP - --S 10404S 10404
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