Uso del polietilenglicol (PEG-6000) como indicador de la ingestión en ganado vacuno: puesta apunto del método en estabulación
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Date
2011
Authors
Casasús Pueyo, IsabelAlbanell, E.
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conferenceObjectAbstract
Polyethyleneglycol 6000 (PEG) was selected as a potential indigestible
estimator of faecal output in cattle. NIRS-calibration equations of PEG faecal content were
obtained with faeces from hay-fed cows with 0 to 10% PEG content. A digestibility trial was
conducted with 8 dry cows in digestibility cages for two 3-wk periods, during which half the
cows received either a Low (9 kg hay, as fed) or High (12 kg hay) feeding level (FL), and
were dosed daily during the last 10 d either 175 (Low) or 235 (High FL) g PEG/d. In the last 4
d total faeces were collected, and in the last day rectal samples were obtained every 4 h.
Samples were NIRS-scanned to determine faecal PEG content. Faecal PEG recovery was
95.7% in total faeces and 92.3% in rectal samples. Faecal output was slightly overestimated
with PEG data from total faeces (+5.2%), and so was calculated feed intake, although only
significantly in the High FL (+6.0%), while estimates were accurate in the Low FL. Data from
rectal samples led to 27% overestimation irrespective of FL, therefore the practical interest of
this technique should be reconsidered
Description
Keywords
Intake prediction, Faecal output, External markers, PEG
Bibliographic citation
Casasús, I., Albanell, E. “Uso del polietilenglicol (PEG-6000) como indicador de la ingestión en ganado vacuno: puesta apunto del método en estabulación”. En: 41 Jornadas de Estudio. XIV Jornadas sobre Producción Animal. AIDA. Zaragoza, España, 17 y 18 de mayo de 2011, pp.183-185. ISBN: 978-84-615-0062-8
Other field subjects
Sistemas de alimentaciónDigestibilidad
Experimentación in vitro
Ganado vacuno
Producción y sanidad animal