Genetic parameters for fatty acids in intramuscular fat from feedlot-finished Nelore carcasses
Carolyn Aboujaoude A , Angélica Simone Cravo Pereira B , Fabieli Louise Braga Feitosa A , Marcos Vinicius Antunes de Lemos A , Hermenegildo Lucas Justino Chiaia A , Mariana Piatto Berton A E , Elisa Peripolli A , Rafael Medeiros de Oliveira Silva A , Adrielle Mathias Ferrinho B , Lenise Freitas Mueller C , Bianca Ferreira Olivieri A , Lucia Galvão de Albuquerque A D , Henrique Nunes de Oliveira A D , Humberto Tonhati A D , Rafael Espigolan A , Rafael Tonussi A , Daniel Mansan Gordo A , Ana Fabricia Braga Magalhaes A and Fernando Baldi A D
+ Author Affiliations
- Author Affiliations
A Universidade EstadualPaulista, Faculdade de CiênciasAgrárias e Veterinárias, Departamento de Zootecnia, Via de Acesso Prof. Paulo Donato Castellane, s/no, CEP 14884-900 Jaboticabal, SP, Brazil.
B Universidade de São Paulo, Faculdade de MedicinaVeterinária e Zootecnia, Departamento de Nutrição e Produção Animal, Avenuenida Duque de Caxias Norte, 225, CEP 13635-900 Pirassununga, SP, Brazil.
C Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Zootecnia, Avenuenida Duque de Caxias Norte, 225, CEP 13635-900 Pirassununga, SP, Brazil.
D National Counsel of Technological and Scientific Development, CNPq, SHIS QI 1 Conjunto B - Blocos A, B, C e D, CEP 71605-001, Lago Sul, Brasília, DF, Brazil.
E Corresponding author. Email: mapberton@gmail.com
Animal Production Science 58(2) 234-243 https://doi.org/10.1071/AN16107
Submitted: 20 February 2016 Accepted: 19 August 2016 Published: 14 November 2016
Abstract
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 α-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 α-linolenic acid were low (<0.30), except for the correlation between arachidonic and α-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 with omega 3FAs (–0.67 ± 0.26). The present 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.
Additional keywords: genetic correlation, genetic variation, heritability, lipid composition, marbling, meat quality, Zebu cattle.
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