Genetic parameters for fatty acids in intramuscular fat from feedlot-finished Nelore carcasses
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Data
2018-01-01
Autores
Aboujaoude, Carolyn [UNESP]
Cravo Pereira, Angelica Simone
Braga Feitosa, Fabieli Louise [UNESP]
Antunes de Lemos, Marcos Vinicius [UNESP]
Justino Chiaia, Hermenegildo Lucas [UNESP]
Berton, Mariana Piatto [UNESP]
Peripolli, Elisa [UNESP]
Oliveira Silva, Rafael Medeiros de [UNESP]
Ferrinho, Adrielle Mathias
Mueller, Lenise Freitas
Título da Revista
ISSN da Revista
Título de Volume
Editor
Csiro Publishing
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.
Descrição
Palavras-chave
genetic correlation, genetic variation, heritability, lipid composition, marbling, meat quality, Zebu cattle
Como citar
Animal Production Science. Clayton: Csiro Publishing, v. 58, n. 2, p. 234-243, 2018.