Genetic parameters for fatty acids in intramuscular fat from feedlot-finished Nelore carcasses

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Aboujaoude, Carolyn ^[1] ; Cravo Pereira, Angelica Simone ^[2] ; Braga Feitosa, Fabieli Louise ^[1] ; Antunes de Lemos, Marcos Vinicius ^[1] ; Justino Chiaia, Hermenegildo Lucas ^[1] ; Berton, Mariana Piatto ^[1] ; Peripolli, Elisa ^[1] ; de Oliveira Silva, Rafael Medeiros ^[1] ; Ferrinho, Adrielle Mathias ^[2] ; Mueller, Lenise Freitas ^[3] ; Olivieri, Bianca Ferreira ^[1] ; de Albuquerque, Lucia Galvao ^{[1, 4]} ; de Oliveira, Henrique Nunes ^{[1, 4]} ; Tonhati, Humberto ^{[1, 4]} ; Espigolan, Rafael ^[1] ; Tonussi, Rafael ^[1] ; Gordo, Daniel Mansan ^[1] ; Braga Magalhaes, Ana Fabricia ^[1] ; Baldi, Fernando ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Zootecnia, Fac Ciencias Agr & Vet, Via Acesso Prof Paulo Donato Castellane S-No, BR-14884900 Jaboticabal, SP - Brazil

^[2] Univ Sao Paulo, Dept Nutr & Prod Anim, Fac Med Vet & Zootecnia, Ave Duque de Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Sao Paulo, Dept Zootecnia, Fac Zootecnia & Engn Alimentos, Ave Duque de Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[4] Natl Counsel Technol & Sci Dev, CNPq, SHIS QI 1 Conjunto B Blocos A B C & D, BR-71605001 Brasilia, DF - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANIMAL PRODUCTION SCIENCE; v. 58, n. 2, p. 234-243, 2018.
• Citações Web of Science: 2

Resumo

The aim of the present study was to estimate covariance components and genetic parameters for beef fatty acid (FA) composition of intramuscular fat in the longissimus thoracis muscle in Nelore bulls finished in feedlot. Twenty-two FAs were selected. The heritability estimates for individual FAs ranged from 0.01 to 0.35. The heritability estimates for myristic (0.25 +/- 0.09), palmitic (0.18 +/- 0.07), oleic (0.28 +/- 0.09), linoleic (0.16 +/- 0.06) and alpha-linolenic (0.35 +/- 0.10) FAs were moderate. Stearic, elaidic, palmitoleic, vaccenic, conjugated linoleic acid, docosahexanoic, eicosatrienoic and arachidonic FAs had heritability estimates below 0.15. The genetic-correlation estimates between the individual saturated FAs (SFAs) were low and negative between myristic and stearic FAs (-0.22 +/- 0.84), moderate between palmitic and myristic FAs (0.58 +/- 0.56) and negative between palmitic and stearic FAs (-0.69 +/- 0.45). The genetic correlations between the individual long-chain polyunsaturated FAs (PUFAs) were positive and moderate (>0.30). However, the genetic-correlation estimates between long-chain PUFAs and alpha-linolenic acid were low (<0.30), except for the correlation between arachidonic and alpha-linolenic acids. The genetic correlation estimates of the sums of SFAs with monounsaturated fatty acids and omega 6 FAs were low (0.25 +/- 0.59 and -0.02 +/- 0.51 respectively), high with PUFAs and omega 9 FAs (-0.85 +/- 0.15 and 0.86 +/- 0.17 respectively) and moderate withomega3FAs(-0.67 +/- 0.26). Thepresent study demonstrated the existence of genetic variation and, hence, the possibility to increase the proportion of healthy and favourable beef FAs through selection. The results obtained in the study have provided knowledge to elucidate the additive genetic influence on FA composition of intramuscular fat. In addition, genetic-relationship estimates of intramuscular FA profile help seek strategies for genetic selection or genetic-based diet management to enhance the FA profile in Zebu cattle. (AU)

• Processo FAPESP: 11/21241-0 - Estudo da variabilidade genética do perfil de ácidos graxos da carne de bovinos da raça Nelore terminados em confinamento
• Beneficiário: Fernando Sebastián Baldi Rey
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 09/16118-5 - Ferramentas genômicas no melhoramento genético de características de importância econômica direta em bovinos da raça Nelore
• Beneficiário: Lucia Galvão de Albuquerque
• Linha de fomento: Auxílio à Pesquisa - Temático