000119598 001__ 119598
000119598 005__ 20250214141226.0
000119598 0247_ $$2doi$$a10.1071/AN21043
000119598 0248_ $$2sideral$$a127084
000119598 037__ $$aART-2021-127084
000119598 041__ $$aeng
000119598 100__ $$aYuste S.
000119598 245__ $$aGrowth and bacterial dynamics of beef calves during transition from milk/pasture to a high-concentrate diet added with tannins or medium-chain fatty acids
000119598 260__ $$c2021
000119598 5060_ $$aAccess copy available to the general public$$fUnrestricted
000119598 5203_ $$aContext. Rumen fermentation modulation with feed additives during the transition period to high-concentrate diets might help to avoid bacterial dysbiosis. Aims. Assessing the effects of the addition of tannins and medium-chain fatty acids (MCFA) to the adaptation diet of beef calves to a high-concentrate ration on the rate of intake, animal performance and rumen bacterial composition. Methods. Eighteen 7-month-old beef calves were abruptly weaned and transitioned over a 28-day period from a milk/grass regime to one of the following diets: a non-supplemented high-concentrate diet plus wheat straw, both given ad libitum (C); C plus 20 g/kg of a 65:35 chestnut and quebracho tannin extract; and C plus 6 g/kg of a commercial mixture of MCFA. Concentrate and straw rate of intake were recorded. Rumen fluid was collected on Days 0, 1, 7, 14, 21 and 28 at 0, 3, 6 and 9 h after feeding to characterise rumen fermentation. Samples from 0 h were analysed to assess the bacterial population using Ion Torrent sequencing. Key results. The rate of intake of concentrates and straw, as well as daily gains and final weights, were similar (P > 0.05) among diets. The addition of tannins or MCFA did not modify (P = 0.98) the rumen bacterial population, which was affected by sampling day (P < 0.001). The additives inclusion did not affect relative abundances of the main bacterial taxa (P < 0.05), most of them differing across days (P < 0.001). Diversity indexes (Shannon and richness) declined over sampling days (P < 0.05), although some genera emerged after concentrate inclusion. Conclusions. At the doses used in the present experiment, tannins and MCFA did not exert any effect on intake, animal performance and bacterial population. Abrupt transition to high-concentrate diets modified the rumen environment and bacterial community, indicating bacterial adaptation to new environmental conditions. Implications. Abrupt transition of 7-month-old calves from milk/pasture to a high-concentrate diet did not impair rumen microbiota or performance; therefore, the use of feed additives seems unnecessary. © 2021 CSIRO. All rights reserved.
000119598 536__ $$9info:eu-repo/grantAgreement/ES/MINECO-DGA-FSE/AGL2013-46820
000119598 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000119598 590__ $$a1.57$$b2021
000119598 591__ $$aAGRICULTURE, DAIRY & ANIMAL SCIENCE$$b38 / 62 = 0.613$$c2021$$dQ3$$eT2
000119598 592__ $$a0.439$$b2021
000119598 593__ $$aFood Science$$c2021$$dQ2
000119598 593__ $$aAnimal Science and Zoology$$c2021$$dQ2
000119598 594__ $$a3.1$$b2021
000119598 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000119598 700__ $$0(orcid)0000-0001-8932-4615$$aAmanzougarene Z.
000119598 700__ $$ade la Fuente G.
000119598 700__ $$0(orcid)0000-0002-0712-1185$$aFondevila M.$$uUniversidad de Zaragoza
000119598 700__ $$0(orcid)0000-0002-8753-8887$$ade Vega A.$$uUniversidad de Zaragoza
000119598 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal
000119598 773__ $$g61, 12 (2021), 1213-1223$$pAnim. Prod. Sci.$$tAnimal Production Science$$x1836-0939
000119598 8564_ $$s216035$$uhttps://zaguan.unizar.es/record/119598/files/texto_completo.pdf$$yVersión publicada
000119598 8564_ $$s2651475$$uhttps://zaguan.unizar.es/record/119598/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000119598 909CO $$ooai:zaguan.unizar.es:119598$$particulos$$pdriver
000119598 951__ $$a2025-02-14-14:11:18
000119598 980__ $$aARTICLE