000168570 001__ 168570
000168570 005__ 20260211123813.0
000168570 0247_ $$2doi$$a10.1016/j.anifeedsci.2026.116670
000168570 0248_ $$2sideral$$a148032
000168570 037__ $$aART-2026-148032
000168570 041__ $$aeng
000168570 100__ $$0(orcid)0000-0002-7829-1448$$aLobón, Sandra
000168570 245__ $$aEffects of protein reduction in lamb fattening concentrate on in vivo digestibility, nitrogen balance and meat quality
000168570 260__ $$c2026
000168570 5060_ $$aAccess copy available to the general public$$fUnrestricted
000168570 5203_ $$aDetermining the optimal crude protein (CP) content in light lambs’ diets is crucial for reducing ammonia. This study assessed lowering CP in fattening concentrates and its effect on digestibility and meat quality (two experiments). Two phases were tested: growing (14–19 kg BW; 18 % vs. 20 % CP) and finishing (19–25 kg BW; 17 % vs. 19 % CP). Experiment 1 involved 24 Rasa Aragonesa lambs, 12 per phase (growing: 14.0 ± 0.87 kg BW; finishing: 18.9 ± 0.78 kg BW, n = 6 per treatment) to assess apparent digestibility, nitrogen balance, and blood metabolites. The adaptation period to the diets were 12 days, while the collection period was 5 days. Digestibility was measured by total faecal collection and acid-insoluble ash (AIA) as internal marker. Experiment 2 evaluated meat quality of 24 Ripollesa lambs, slaughtered at 24.6 ± 0.23 kg BW after 42 days of fattening. Lower CP tended to decrease the acid detergent fibre (ADF) digestibility using total faecal method (P = 0.06) and decreased organic and dry matter digestibility with AIA (P = 0.03) during the growing phase (P < 0.05). No differences were observed in the finishing phase (P > 0.10). Digestibility coefficients were consistently underestimated with AIA compared to total faecal collection (P < 0.001). Nitrogen balance was unaffected by CP level (P > 0.05). Plasma metabolites were similar between treatments, except for β-hydroxybutyrate, which tended to be lower in Low CP lambs during the finishing (P = 0.09). Meat quality was minimally affected, however, Low CP increased metmyoglobin after 6 days of oxygen exposure (P = 0.005) and modified minor fatty acids. A moderate reduction of 2 % in dietary CP of light lambs appears feasible and does not impair nutrient digestibility and meat quality.
000168570 536__ $$9info:eu-repo/grantAgreement/ES/DGA/A25-23R$$9info:eu-repo/grantAgreement/ES/INIA/RTA2017-00008-C02$$9info:eu-repo/grantAgreement/ES/MINECO/PRE2018-086670
000168570 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttps://creativecommons.org/licenses/by-nc/4.0/deed.es
000168570 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000168570 700__ $$aBaila, Clàudia
000168570 700__ $$0(orcid)0000-0001-6445-849X$$aÁlvarez-Rodríguez, Javier$$uUniversidad de Zaragoza
000168570 700__ $$0(orcid)0000-0003-3875-4935$$aBlanco, Mireia
000168570 700__ $$0(orcid)0000-0003-3943-5311$$aCasasús, Isabel
000168570 700__ $$aPelegrin-Valls, Jonathan
000168570 700__ $$0(orcid)0000-0002-4556-1640$$aJoy, Margalida
000168570 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal
000168570 773__ $$g334 (2026), 116670 [12 pp.]$$pAnim. feed sci. technol.$$tAnimal Feed Science and Technology$$x0377-8401
000168570 8564_ $$s880571$$uhttps://zaguan.unizar.es/record/168570/files/texto_completo.pdf$$yVersión publicada
000168570 8564_ $$s2152242$$uhttps://zaguan.unizar.es/record/168570/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000168570 909CO $$ooai:zaguan.unizar.es:168570$$particulos$$pdriver
000168570 951__ $$a2026-02-11-10:27:24
000168570 980__ $$aARTICLE