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Carcass and meat quality of Nellore cattle (Bos taurus indicus) belonging to the breeding programs

Malheiros, Jéssica Moraes; Enriquez Valencia, Elena; Silva Josineudson, Augusto Ii Vasconcelos; De Oliveira, Henrique; Curi, Rogerio Abdallah; Albuquerque, L. G.; Chardulo, Luis Artur (2020)

The objective of this study was to estimate and describe phenotypic traits for carcass and meat quality in Nellore cattle belonging to the breeding programs. Data from 718 Nellore animals participated in the Delta Gen, CRV ...
Gene and protein expression of myosin heavy chain in Nellore cattle comparing growth or meat tenderness traits

Chardulo, Luís Artur Loyola; Baldassini, Welder A.; Curi Rogério, Abdallah; Pereira, Guilherme Luis; Machado Neto, Otávio Rodrigues; Dal Pai, Maeli; Vechetti Júnior, Ivan José; Malheiros, Jéssica Moraes; Enriquez Valencia, Cruz Elena (2019)

The objective was to investigate gene and protein expression of myosin heavy chain (MyHC) in Nellore cattle slaughtered at different weights (BW) or degrees of meat tenderness. Ninety animals with initial BW 370 ± 37 kg, ...

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Carcass and meat quality of Nellore cattle (Bos taurus indicus) belonging to the breeding programs
...
Malheiros, Jéssica Moraes | 2020

The objective of this study was to estimate and describe phenotypic traits for carcass and meat quality in Nellore cattle belonging to the breeding programs. Data from 718 Nellore animals participated in the Delta Gen, CRV Paint and Nelore Qualitas breeding programs were used. Meat quality traits were measured and the data were analyzed. The following means and standard deviations of the meat quality traits were obtained: shear force (SF = 5.7 ± 1.3 kg), myofibril fragmentation index (MFI = 32.0 ± 15.3), cooking loss (CL = 27.7 ± 3.1%), intramuscular lipid content (ILC = 0.9 ± 0.5%), backfat thickness (BFT = 4.2 ± 1.4 mm), marbling score (MS = 2.6 ± 0.36), rib eye area (REA = 72.8 ± 7.35 cm2) and instrumental color (lightness (L* = 27.9 ± 2.7), redness (a* = 12.4 ± 1.86), yellowness (b* = 5.5 ± 1.0)). Significant phenotypic correlations were observed between BFT and MS (0.2314), and between MS and ILC (0.1308). A negative and significant correlation was found between SF and MFI (-0.5525); however, the correlation with MFI was low in animals with SF values higher than 6 kg. In principal component analysis (PCA), the first four eigenvalues of the matrix of direct additive genetic variance explained 61.26% of the total additive genetic variance in the meat quality traits. The most important meat quality traits in PC1 were a*, b* and CL. PC2 was characterized by MFI and color (a* and b*), PC3 by MS, BFT and L* and PC4 by ILC, L* and b*. Furthermore, BFT was positively associated with MS, SF and CL, and SF was negatively associated with MFI. The present study suggests that muscle growth and backfat thickness were satisfactory; however, intramuscular fat deposition and meat tenderness still require more attention from the breeding programs.

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Gene and protein expression of myosin heavy chain in Nellore cattle comparing growth or meat tenderness traits
...
Chardulo, Luís Artur Loyola | 2019

The objective was to investigate gene and protein expression of myosin heavy chain (MyHC) in Nellore cattle slaughtered at different weights (BW) or degrees of meat tenderness. Ninety animals with initial BW 370 ± 37 kg, 24 months of age, were slaughtered after 95 days on feed. We evaluated shear force (SF), myofibrillar fragmentation index, ribeye area, backfat thickness, marbling, color, and cooking losses. Subsequently, 24 animals were selected and divided into four contrasting groups, in which light (BW ¼ 504.58 ± 32.36 kg) versus heavy animals (BW ¼ 604.83 ± 42.97 kg) and animals with tender (SF ¼ 3.88 ± 0.57 kg) versus tough meat (SF¼ 7.95 ± 1.04 kg) were compared. The MYH7, MYH2 and MYH1 genes were analyzed by real-time PCR. The MyHC isoforms (MyHC-I, MyHC-IIa, and MyHC-IIx) were quantified by SDS-PAGE electrophoresis. We found lower expression of MYH2 and MYH1 genes in heavy compared to light animals and a higher amount of MyHC-I isoform in the tough meat group compared to the tender meat group. Protein expression of MyHC-IIa was higher in the tender meat group. A negative correlation was found of this protein and SF (tenderness), suggesting MyHC-IIa as a biomarker of meat quality.

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Browsing by Author "Malheiros, Jéssica Moraes"

Carcass and meat quality of Nellore cattle (Bos taurus indicus) belonging to the breeding programs ﻿

Gene and protein expression of myosin heavy chain in Nellore cattle comparing growth or meat tenderness traits ﻿

Envíos recientes

Carcass and meat quality of Nellore cattle (Bos taurus indicus) belonging to the breeding programs

Gene and protein expression of myosin heavy chain in Nellore cattle comparing growth or meat tenderness traits

Carcass and meat quality of Nellore cattle (Bos taurus indicus) belonging to the breeding programs

Gene and protein expression of myosin heavy chain in Nellore cattle comparing growth or meat tenderness traits