title: SID tryptophan levels and B6 vitamin supplementation do not change blood parameters, organ weights, carcass traits, and meat quality of barrows (70-100kg).
abstract: This study evaluated the effects of standardized ileal digestible (SID) tryptophan and B6 on blood parameters, organ weights, carcass traits, and longissimus lumborum quality of barrows (70-100kg). Sixty-four crossbred barrows averaging 70.77±2.07kg were distributed in a 4×2 factorial with four SID tryptophan levels (0.130, 0.155, 0.180, and 0.205%) and two B6 levels (1 and 5mg/kg) in eight replicates of one animal each. The meat lightness degree answered linearly (P=0.015) to SID tryptophan levels and the shear force answered quadratically (P=0.050), with estimates of a higher value (31.67N) at 0.163% SID tryptophan. Although B6 showed positive effects (P<0.05) on hot and cold carcass yields and pH24, it resulted in a negative effect (P<0.05) on ham weight and yield, and increased the drip loss and cooking fluid. The dietary SID tryptophan requirement for barrows (70-100kg) was not higher than 0.130% (4.07g/day) and did not change due to B6.
authors.affiliation: Department of Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná 87020-900, Brazil. Electronic address: leandrocastilha@hotmail.com.
authors.forename: L D
authors.initials: LD
authors.lastname: Castilha
authors.affiliation: Doctoral Course in Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná, 87020-900, Brazil.
authors.forename: L M D
authors.initials: LM
authors.lastname: Huepa
authors.affiliation: Doctoral Course in Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná, 87020-900, Brazil.
authors.forename: M R
authors.initials: MR
authors.lastname: Fachinello
authors.affiliation: Department of Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná 87020-900, Brazil.
authors.forename: M S S
authors.initials: MS
authors.lastname: Pozza
authors.affiliation: Department of Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná 87020-900, Brazil.
authors.forename: R S
authors.initials: RS
authors.lastname: Vasconcellos
authors.affiliation: Doctoral Course in Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná, 87020-900, Brazil.
authors.forename: L P
authors.initials: LP
authors.lastname: Bonagurio
authors.affiliation: Department of Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná 87020-900, Brazil.
authors.forename: S M
authors.initials: SM
authors.lastname: Marcato
authors.affiliation: Department of Animal Science, Universidade Estadual de Maringá-UEM, Maringá, Paraná 87020-900, Brazil.
authors.forename: P C
authors.initials: PC
authors.lastname: Pozza
mesh_terms: D000821:Animal Feed; D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D001823:Body Composition; D003404:Creatinine / Q000097:blood; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D063427:Food Quality; D007082:Ileum / Q000187:drug effects* / Q000378:metabolism; D018482:Muscle, Skeletal / Q000187:drug effects / Q000378:metabolism; D009929:Organ Size / Q000187:drug effects*; D010641:Phenotype; D000069466:Red Meat / Q000032:analysis*; D013552:Swine; D014280:Triglycerides / Q000097:blood; D014364:Tryptophan / Q000032:analysis* / Q000494:pharmacology; D025101:Vitamin B 6 / Q000032:analysis* / Q000494:pharmacology
chemical_list: D001786:Blood Glucose; D014280:Triglycerides; D025101:Vitamin B 6; D014364:Tryptophan; D003404:Creatinine
keywords: Aromatic amino acid; Swine nutrition; Water soluble vitamin