“…Similar effects of increased milk yield per day and milk protein content have been observed on feeding dairy cows, goats, ewes' and cattles with probiotic yeast supplemented diets (Wang et al, 2001;Abd El-Ghani, 2004;Stella et al, 2007;Masek et al, 2008;Moallem et al, 2009;de Ondarza et al, 2010). Several investigations have showed that young ruminants fed live yeast culture supplemented feedstuffs showed positive effects on performance, evidenced by improved feed consumption, feed conversion efficiency and increase in body weight gain (Fadel El-seed et al, 2004;Lesmeister et al, 2004;Haddad and Goussous, 2005;Kawas et al, 2007;Stella et al, 2007;Pal et al, 2010). It has been reported that probiotic yeasts improve the ruminant's growth and performance either when they are fed nutritionally poor diets (Jouany et al, 1998) or when they are fed diets rich in highly fermentable sugars (Zelenak et al, 1994).…”