Qinchuan cattle are one of the top breeds in China. In the current study, cattle of different ages were used to investigate the effect of age on beef quality. With increasing age, shear force, protein content, hydroxy...Qinchuan cattle are one of the top breeds in China. In the current study, cattle of different ages were used to investigate the effect of age on beef quality. With increasing age, shear force, protein content, hydroxyproline (Hyp) content, redness (a*), and muscle fiber diameter and density significantly increased (P〈0.05). On the other hand, cooking loss, water content, lightness (L*), and muscle fiber gap markedly decreased (P〈0.05). No significant differences were found in the contents of intramuscular fat, ash, amino acids (AA), mineral elements, and expression level of leptin and FAS (P〉0.05). The C16:0 and C18:0 content increased significantly (P〈0.05), in contrast to that of C18:1 and C18:2 (P〈0.05). COLA1 mRNA was expressed at low levels at mon 3 and 9 but markedly increased at mon 12 and 15 (P〈0.05). Taken together, these observations demonstrate excellent nutritional values of beef from cattle of different ages concordant with their chemical properties; on the other hand, their commercial value correlates more closely with their physical and sensory characteristics.展开更多
Silent information regulator 2 (Sir2) proteins, or sirtuins, are nicotine adenine dinucleotide (NAD)-dependent deacetylases that connect metabolism with longevity in lower organisms. In mammals, there are seven Si...Silent information regulator 2 (Sir2) proteins, or sirtuins, are nicotine adenine dinucleotide (NAD)-dependent deacetylases that connect metabolism with longevity in lower organisms. In mammals, there are seven Sir2 homologs, namely, silent information regulators (SIRT1-7). SIRT4 and SIRT7 genes play a crucial role in regulating lipid metabolism, cellular growth and metabolism. This suggests that they are potential candidate genes for affecting body size and meat quality traits in animals. Hence, this study aimed to detect genetic variations of both SIRT4 and SIRT7 bovine genes in Qinchuan cattle, and to evaluate the effect of these variations on economically important body size and meat quality traits. Expression analysis using quantitative real-time PCR (qPCR) indicated that SIRT4 and SIRT7 were broadly expressed in all thirteen studied tissues. The expression of SIRT4 was higher in liver, muscle, and in subcutaneous fat tissue. In the case of SIRT7, the expression was higher in lung, abomasum, and subcutaneous fat. Using DNAsequencing, a total of three single nucleotide polymorphisms (SNPs) were identified within SIRT4 and SIRT7 genes in 468 Qinchuan cattle. These included one novel SNP within 3' untranslated regions (UTR) of SIRT4 (SNP1: g. 13915A〉G) and two novel synonymous substitutions in SIRT7 (SNP2: g.3587C〉T and SNP3: g.3793T〉C). Statistical analyses indicated that all three SNPs could significantly influence some body size and meat quality traits in Qinchuan cattle. These novel findings will provide a background for application of bovine SIRT4 and SIRT7 genes in the selection program of Chinese cattle.展开更多
基金supported by the Changjiang Scholars and Innovative Research Team Support Plan,Ministry of Education,China (IRT 0940)Sci-Tech Innovation Project of Shaanxi Province 13115 (2010 ZDGC-01)
文摘Qinchuan cattle are one of the top breeds in China. In the current study, cattle of different ages were used to investigate the effect of age on beef quality. With increasing age, shear force, protein content, hydroxyproline (Hyp) content, redness (a*), and muscle fiber diameter and density significantly increased (P〈0.05). On the other hand, cooking loss, water content, lightness (L*), and muscle fiber gap markedly decreased (P〈0.05). No significant differences were found in the contents of intramuscular fat, ash, amino acids (AA), mineral elements, and expression level of leptin and FAS (P〉0.05). The C16:0 and C18:0 content increased significantly (P〈0.05), in contrast to that of C18:1 and C18:2 (P〈0.05). COLA1 mRNA was expressed at low levels at mon 3 and 9 but markedly increased at mon 12 and 15 (P〈0.05). Taken together, these observations demonstrate excellent nutritional values of beef from cattle of different ages concordant with their chemical properties; on the other hand, their commercial value correlates more closely with their physical and sensory characteristics.
基金supported by the National 863 Program of China (2013 AA102505)the National Natural Science Foundation of China (31272411 and 31402044)+2 种基金the National Beef and Yak Industrial Technology System,China (CARS-38)the China Postdoctoral Science Foundation (2016M590976)the Key Technologies R&D Program of Henan Province,China (122102110062)
文摘Silent information regulator 2 (Sir2) proteins, or sirtuins, are nicotine adenine dinucleotide (NAD)-dependent deacetylases that connect metabolism with longevity in lower organisms. In mammals, there are seven Sir2 homologs, namely, silent information regulators (SIRT1-7). SIRT4 and SIRT7 genes play a crucial role in regulating lipid metabolism, cellular growth and metabolism. This suggests that they are potential candidate genes for affecting body size and meat quality traits in animals. Hence, this study aimed to detect genetic variations of both SIRT4 and SIRT7 bovine genes in Qinchuan cattle, and to evaluate the effect of these variations on economically important body size and meat quality traits. Expression analysis using quantitative real-time PCR (qPCR) indicated that SIRT4 and SIRT7 were broadly expressed in all thirteen studied tissues. The expression of SIRT4 was higher in liver, muscle, and in subcutaneous fat tissue. In the case of SIRT7, the expression was higher in lung, abomasum, and subcutaneous fat. Using DNAsequencing, a total of three single nucleotide polymorphisms (SNPs) were identified within SIRT4 and SIRT7 genes in 468 Qinchuan cattle. These included one novel SNP within 3' untranslated regions (UTR) of SIRT4 (SNP1: g. 13915A〉G) and two novel synonymous substitutions in SIRT7 (SNP2: g.3587C〉T and SNP3: g.3793T〉C). Statistical analyses indicated that all three SNPs could significantly influence some body size and meat quality traits in Qinchuan cattle. These novel findings will provide a background for application of bovine SIRT4 and SIRT7 genes in the selection program of Chinese cattle.