000150714 001__ 150714
000150714 005__ 20251017144642.0
000150714 0247_ $$2doi$$a10.1016/j.anifeedsci.2025.116243
000150714 0248_ $$2sideral$$a142865
000150714 037__ $$aART-2025-142865
000150714 041__ $$aeng
000150714 100__ $$aRomera-Recio, E.
000150714 245__ $$aEffects of feed additives in the diet of male dairy beef calves on physiological status and rumen microbial fermentation pre- and postweaning
000150714 260__ $$c2025
000150714 5060_ $$aAccess copy available to the general public$$fUnrestricted
000150714 5203_ $$an Spain, a large number of unweaned calves from northern Europe's dairy industry are transported for intensive beef production, which could pose health risks around weaning due to the separation from their mothers. This study evaluated the impact of including different feed additives in starter concentrate on blood parameters and rumen functional development in 112 calves at the growing farm. We hypothesized that feed additives could enhance rumen function and mitigate health risks associated with transportation and intensive management. The treatments tested, against a control diet (CTL), included: blend of essential oils from plant extracts (EO), yeast-based products (SYN) and a mix of yeast probiotics, oregano-based essential oil and sodium butyrate (MIX). Each treatment was administered during the preweaning stage, with all calves transitioning to the MIX diet postweaning. In the experiment, blood and rumen samples were collected before weaning (8 weeks old) and two months after weaning (18 weeks old) for rumen fermentation and microbial population analyses. Calves were weighed upon arrival (3 weeks), at weaning (10 weeks) and two months postweaning (18 weeks) to assess performance. Results from the experiment showed that rumen fermentation profiles remained stable with regard to volatile fatty acids (VFA) concentrations and pH, indicating effective solid feed consumption and microbial activity before weaning. Postweaning, all feed additives treatments improved rumen fermentation by increasing total VFA and lowering pH, though body weight gains remained unaffected. Concentrations of bacteria and archaea increased compared to preweaning levels, protozoa were absent, and anaerobic fungi did not become established until 2 months postweaning. In conclusion, feed additives provided preweaning improved rumen development, although they did not increase productivity. The treatment should be applied preweaning, highlighting the importance of this particular window of time.
000150714 536__ $$9info:eu-repo/grantAgreement/ES/AEI/MICNN/PID2021-123206OB-I00$$9info:eu-repo/grantAgreement/ES/MICINN/RYC2019-027764-I/AEI/10.13039/501100011033
000150714 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
000150714 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000150714 700__ $$aRamos-Morales, E.
000150714 700__ $$0(orcid)0000-0001-5880-6021$$aBelanche, A.$$uUniversidad de Zaragoza
000150714 700__ $$aHassan, M.
000150714 700__ $$aRomero, P.
000150714 700__ $$aGómez, A.
000150714 700__ $$aRivelli, I.
000150714 700__ $$aLlanes, N.
000150714 700__ $$aTorra, J.
000150714 700__ $$aYáñez-Ruiz, D.R.
000150714 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal
000150714 773__ $$g321 (2025), 116243 [12 pp.]$$pAnim. feed sci. technol.$$tAnimal Feed Science and Technology$$x0377-8401
000150714 8564_ $$s500647$$uhttps://zaguan.unizar.es/record/150714/files/texto_completo.pdf$$yVersión publicada
000150714 8564_ $$s2032736$$uhttps://zaguan.unizar.es/record/150714/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000150714 909CO $$ooai:zaguan.unizar.es:150714$$particulos$$pdriver
000150714 951__ $$a2025-10-17-14:32:28
000150714 980__ $$aARTICLE