000147946 001__ 147946 000147946 005__ 20250923084440.0 000147946 0247_ $$2doi$$a10.3390/ani14243572 000147946 0248_ $$2sideral$$a141434 000147946 037__ $$aART-2024-141434 000147946 041__ $$aeng 000147946 100__ $$ade Almeida, André Martinho 000147946 245__ $$aReducing Dietary Protein Levels with Amino Acid Supplementation in Duroc Sire Line Finishing Pigs: Growth Performances, Carcass and Meat Traits and Nitrogen Balance in Males and Females 000147946 260__ $$c2024 000147946 5060_ $$aAccess copy available to the general public$$fUnrestricted 000147946 5203_ $$aCrude protein (CP) reduction and amino acid (AAs) supplementation is an interesting cost-reducing strategy for environmental compliance. The objective of this work is to study productive performances of heavy Duroc X (Landrace X Large white) male and female pigs during the finishing stage under a 2% CP reduction with crystalline AA supplementation. A total of 60 entire male and 60 female pigs (means ± standard deviations: 109 ± 4.9 days of age; 67.9 ± 7.18 kg of body weight) were distributed in split-sex pens (6 pigs/pen) and fed ad libitum. Two isoenergetic diets were provided (145 and 125 g CP/kg with AA supplementation, control and low-CP) during the final 42 days of finishing period. Growth performance, carcass and meat traits were evaluated. The fixed effects of dietary treatment, sex and their interaction were considered and simple least squares models used. Males were 7.25% heavier (p < 0.001) and had 16% higher average daily gains (p < 0.0001) than females in both treatments with no differences in feed intake or feed conversion ratio (p > 0.05). Nitrogen efficiency was 35% higher in low-CP males. Little difference was found for most carcass and meat traits between treatments. Males had 7–8% higher loin subcutaneous fat thickness in both dietary treatments (p = 0.011). Males and females of the low-CP diet showed higher fat and saturated fat contents than controls (p = 0.020). A 20 g/kg CP reduction with AA supplementation is an efficient strategy during the finishing phase without productivity losses in heavy Duroc sire line genotypes of both sexes. 000147946 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/ 000147946 590__ $$a2.7$$b2024 000147946 592__ $$a0.733$$b2024 000147946 591__ $$aVETERINARY SCIENCES$$b21 / 170 = 0.124$$c2024$$dQ1$$eT1 000147946 593__ $$aVeterinary (miscellaneous)$$c2024$$dQ1 000147946 591__ $$aAGRICULTURE, DAIRY & ANIMAL SCIENCE$$b15 / 86 = 0.174$$c2024$$dQ1$$eT1 000147946 593__ $$aAnimal Science and Zoology$$c2024$$dQ1 000147946 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000147946 700__ $$0(orcid)0000-0002-3005-2675$$aLatorre, María Angeles$$uUniversidad de Zaragoza 000147946 700__ $$0(orcid)0000-0001-8042-8688$$aRipoll, Guillermo 000147946 700__ $$aVerdú, Marçal 000147946 700__ $$0(orcid)0000-0001-6445-849X$$aAlvarez-Rodriguez, Javier$$uUniversidad de Zaragoza 000147946 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal 000147946 773__ $$g14, 24 (2024), 3572 [16 pp.]$$pAnimals (Basel)$$tAnimals$$x2076-2615 000147946 8564_ $$s522684$$uhttps://zaguan.unizar.es/record/147946/files/texto_completo.pdf$$yVersión publicada 000147946 8564_ $$s2857561$$uhttps://zaguan.unizar.es/record/147946/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000147946 909CO $$ooai:zaguan.unizar.es:147946$$particulos$$pdriver 000147946 951__ $$a2025-09-22-14:49:51 000147946 980__ $$aARTICLE