Different means of administering polyethylene glycol to sheep: effect on the nutritive value of Acacia cyanophylla Lindl. foliage

acacia saligna agua potable alantoina alcoholes alcohols alcool aliment pour animaux allantoin antinutritional factors concentrates digestibilidad digestibility digestion du rumen drinking water eau potable excretion facteur antinutritionnel factores antinutricionales feed intake feeds feuille forage hojas leaves nitrogen balance nitrogen metabolism nitrogen retention nutritive value orina ovin ovinos piensos piensos concentrados polietileno polyethylene prise alimentaire (animaux) rumen digestion rumen fermentation sheep taninos tannin tannins urine valeur nutritive valor nutritivo