000150614 001__ 150614 000150614 005__ 20251017144546.0 000150614 0247_ $$2doi$$a10.1017/S0021859615000969 000150614 0248_ $$2sideral$$a93666 000150614 037__ $$aART-2016-93666 000150614 041__ $$aeng 000150614 100__ $$0(orcid)0000-0002-5440-1710$$aGimeno, A. 000150614 245__ $$aEffect of cereal processing (grinding to 3·5 mm or dry-rolling) in maize- or barley-based high-concentrate diets on rumen environment of beef cattle during the late fattening period 000150614 260__ $$c2016 000150614 5203_ $$aSUMMARY The type and processing of cereals for beef cattle are key factors to maximize performance without increasing the risk of ruminal acidosis. The current work studied the effect of grinding (G) or dry-rolling (R) the cereals in a concentrate based on maize (M) or barley (B) on the rumen environment of eight 6-month-old Holstein calves, which received either M or B for 70 days, offered as G and R in two consecutive periods. Daily feed intake pattern, rumen fermentation traits, total rumen bacteria and relative proportions of Streptococcus bovis and Selenomonas ruminantium were characterized twice in each period at 0, 4 and 8 h after feeding. Dry-rolling promoted a 0·25 reduction of concentrate intake during the first 4 h after feeding. Neither cereal type nor its processing form promoted differences in ruminal fermentation at 0 and 4 h; however, 8 h after feeding R cereals resulted in higher rumen pH (6·17 v. 5·71) and lower concentration of lactic acid (88·1 v. 156 mg/l) and volatile fatty acids (only in diet B, 118 v. 164 mm/l) compared with G. Little effect of dietary factors in the target rumen microorganisms were observed. The more balanced fermentation observed with R cereals may be explained by the lower concentrate intake promoted during the first 4 h, coupled with a more difficult access of bacterial enzymes to their starch, thus reducing its fermentation rate. Therefore, feeding dry-rolled cereals may be useful to reduce the risk of acidosis by regulating the intake pattern of the concentrate and/or its fermentation rate. 000150614 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000150614 590__ $$a1.291$$b2016 000150614 591__ $$aAGRICULTURE, MULTIDISCIPLINARY$$b14 / 56 = 0.25$$c2016$$dQ1$$eT1 000150614 592__ $$a0.547$$b2016 000150614 593__ $$aAgronomy and Crop Science$$c2016$$dQ2 000150614 593__ $$aAnimal Science and Zoology$$c2016$$dQ2 000150614 593__ $$aGenetics$$c2016$$dQ4 000150614 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000150614 700__ $$aAl Alami, A. 000150614 700__ $$aYañez-Ruiz, D. R. 000150614 700__ $$0(orcid)0000-0002-8753-8887$$aDe Vega, A.$$uUniversidad de Zaragoza 000150614 700__ $$0(orcid)0000-0003-0656-554X$$aSchauf, S.$$uUniversidad de Zaragoza 000150614 700__ $$0(orcid)0000-0002-0712-1185$$aFondevila, M.$$uUniversidad de Zaragoza 000150614 700__ $$0(orcid)0000-0002-9282-7974$$aCastrillo, C.$$uUniversidad de Zaragoza 000150614 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal 000150614 773__ $$g154, 2 (2016), 334-346$$pJ. agric. sci.$$tJOURNAL OF AGRICULTURAL SCIENCE$$x0021-8596 000150614 8564_ $$s157327$$uhttps://zaguan.unizar.es/record/150614/files/texto_completo.pdf$$yVersión publicada 000150614 8564_ $$s2471970$$uhttps://zaguan.unizar.es/record/150614/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000150614 909CO $$ooai:zaguan.unizar.es:150614$$particulos$$pdriver 000150614 951__ $$a2025-10-17-14:09:48 000150614 980__ $$aARTICLE