... mm) and with two nutrient availabilities(standard substrate and 7% increase in soil N). The concentrations of soluble condensed tannins (CT) and nitrogen in the leaves were analyzed to test the ... Z., Effect of daily supplementation of polyethylene glycol on intake and di-gestion of tannin-containing leaves (Quercus calliprinos, Pistacialentiscus and Ceratonia siliqua) by goats, J. Agric. ... foliage of six oak species, Oecologia 54 (198 2) 205−211.[33] Narjisse H., Elhonsali L. A., Olsen J.D., Effects of oak (Quercus ilex) on digestion and nitrogen balance in sheep and goats, SmallRumin....