scholarly journals Nutritional and developmental effects on the intrinsic properties of muscles as they relate to the eating quality of beef

2001 ◽  
Vol 41 (7) ◽  
pp. 921 ◽  
Author(s):  
V. H. Oddy ◽  
G. S. Harper ◽  
P. L. Greenwood ◽  
M. B. McDonagh
Keyword(s):  
Skeletal Muscle ◽  
Connective Tissue ◽  
Meat Quality ◽  
Quality Attributes ◽  
Nutrient Supply ◽  
Fat Content ◽  
Tissue Composition ◽  
Intrinsic Properties ◽  
Composition And Structure ◽  
Bovine Skeletal Muscle

The intrinsic properties (those extant at the time of slaughter) of bovine skeletal muscle as they relate to the subsequent quality attributes of beef are reviewed here. Attributes of bovine skeletal muscle that ultimately affect toughness, colour, fat content, flavour, juiciness, and nutritive value of beef are discussed. The dynamic nature of muscle development, particularly with regard to structure and composition, is highlighted. Variation in development of muscle structure and composition due to inherited (genetic) factors and environment (particularly nutrient supply) are described. Examples are given of the implications of sources of variation due to animal genotype, age, nutrient supply, and hormonal environment on muscle cellularity and growth, fibre type, connective tissue composition and structure as they affect meat quality attributes. Key intrinsic properties of muscle include muscle type, cellularity, size, myofibre type, connective tissue composition and structure, glycogen and fat content and proteolytic activity. Activity of the calpain system at slaughter is seen as an important attribute. Regulation of myofibrillar and connective tissue proteolysis in vivo are discussed together with implications for subsequent meat quality. Amongst the on-farm environmental factors, nutritional history and developmental pathway are identified as factors that can be responsible for significant variation in the intrinsic properties of muscle that contribute to variation in toughness, colour and fat content, and thus consumer liking of beef.

Prenatal undernutrition increases fat deposition and collagen content within skeletal muscle in the porcine fetus

2005 ◽  
Vol 2005 ◽  
pp. 37-37
Author(s):  
J. Karunaratne ◽  
C. Ashton ◽  
N.C. Stickland
Keyword(s):  
Skeletal Muscle ◽  
Connective Tissue ◽  
Meat Quality ◽  
Primary Objective ◽  
Fat Deposition ◽  
Collagen I ◽  
Ground Substance ◽  
Meat Industry ◽  
Pilot Studies ◽  
Fat Deposits

Connective tissue content of skeletal muscle plays a key role in meat quality. Previous pilot studies carried out in our lab have indicated that the smallest littermate may have a higher proportion of connective tissue in skeletal muscle (Clelland A., 2001). Connective tissue provides a structure to the muscle belly and is composed of ground substance, fibres and connective tissue cells. A proportion of these three elements of the connective tissue comprise of collagen I and fat deposits. This is an important concept to the meat industry as an increased amount of these components can increase meat toughness and intramuscular fat respectively, both having an impact on the resultant meat quality. The primary objective of this study is to investigate the relationship between undernutrition, collagen and fat content using a naturally occurring model. In the pig, it can be argued that differing levels of nutrition received, in utero, are a major cause of intra-litter variation. Therefore the smallest and largest littermates were chosen and content of collagen I and fat deposition were analysed in the M. semitendinosus of both.

Decorin Expression during Development of Bovine Skeletal Muscle and Its Role in Morphogenesis of the Intramuscular Connective Tissue

2002 ◽  
Vol 171 (2-3) ◽  
pp. 199-214 ◽  
Author(s):  
T. Nishimura ◽  
E. Futami ◽  
A. Taneichi ◽  
T. Mori ◽  
A. Hattori
Keyword(s):  
Skeletal Muscle ◽  
Connective Tissue ◽  
Bovine Skeletal Muscle

AGE- AND SEX-ASSOCIATED CHANGES IN CHEMICAL COMPOSITION OF BOVINE TRICEPS BRACHII INTRAMUSCULAR AND EPIMYSIAL CONNECTIVE TISSUE WITH EMPHASIS ON GLYCOSAMINOGLYCANS

1980 ◽  
Vol 60 (3) ◽  
pp. 643-662 ◽  
Author(s):  
T. NAKANO ◽  
J. R. THOMPSON
Keyword(s):  
Skeletal Muscle ◽  
Hyaluronic Acid ◽  
Connective Tissue ◽  
Dermatan Sulfate ◽  
Postnatal Growth ◽  
Triceps Brachii ◽  
Mature Adults ◽  
Age Related ◽  
Bovine Skeletal Muscle ◽  
Age And Sex

Age-related changes were studied in the bovine intramuscular and epimysial connective tissue components from animals ranging in age from fetuses to 8.9 yr and from 1.2 to 8.9 yr, respectively. Intramuscular concentration of nitrogen increased (P < 0.05), while intramuscular concentrations of collagen and glycosaminoglycans (GAG) decreased (P < 0.05) with age until the animals were yearlings. Epimysial concentration of collagen increased and that of GAG decreased (P < 0.05) with age in the postnatal animals. Maturation was associated with decreasing (P < 0.05) amounts of labile collagen, hexosamine, and sialic acid in both tissues and occurred earlier in intramuscular than in epimysial tissue. Epimysial tissue from males contained more (P < 0.05) collagen and less (P < 0.05) labile hexosamine than epimysial tissue from females of a similar age. Hyaluronic acid and dermatan sulfate were the major GAG in bovine skeletal muscle with small amounts of heparan sulfate, chondroitin 4-sulfate, chondroitin 6-sulfate and heparin. Hyaluronic acid:dermatan sulfate weight ratios were greater (P < 0.05) in the intramuscular than in the epimysial tissues. The ratio values were 2.0–2.7 in intramuscular tissues, while in the epimysial tissues, the values were 0.5–0.6 in the yearlings and young adults and 0.9 in the mature adults. In postnatal animals, intramuscular tissues were associated with a smaller (P < 0.05) proportion of chondroitin 6-sulfate in the total GAG than were epimysial tissues. Both hyaluronic acid and dermatan sulfate concentrations decreased (P < 0.05) during fetal and early postnatal growth in the intramuscular tissue, while in the epimysial tissue, dermatan sulfate concentrations gradually decreased (P < 0.05) with age in the postnatal animals. Skeletal muscle maturation was associated with an increased (P < 0.05) stability of connective tissue and a decreased (P < 0.05) amount of total GAG and glycoproteins.

scholarly journals Colocalization of myostatin and decorin in bovine skeletal muscle

2011 ◽  
Vol 54 (2) ◽  
pp. 147-156 ◽  
Author(s):  
E. Albrecht ◽  
X. Liu ◽  
X. Yang ◽  
R. Zhao ◽  
L. Jonas ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Meat Quality ◽  
Muscle Fibres ◽  
Protein Abundance ◽  
Semitendinosus Muscle ◽  
Close Proximity ◽  
Slow Type ◽  
Bovine Skeletal Muscle ◽  
F2 Generation

Abstract. The objectives of this study were to investigate the expression and localization of myostatin (MSTN) and decorin (DCN) in bovine skeletal muscle and to find associations with muscle fibre and adipocyte development. Samples of two muscles, known for differences in meat quality and fibre composition, namely longissimus muscle (LD) and semitendinosus muscle (ST), were obtained from 18 months old bulls of the F2 generation of a Charolais×Holstein cross. Individual muscle sections were stained for determination of size and type of muscle fibres and immunohistochemical detection of the proteins. The mRNA abundance and protein expression of MSTN and DCN were quantified by real-time PCR and Western blot, respectively. As expected, the ST had more fast fibres, less fibres of the intermediate and the slow type, and less intramuscular fat than the LD. Despite these differences, the mRNA and protein abundance of MSTN was comparable in both muscles. The protein abundance of MSTN inhibitors, namely MSTN propeptide and DCN, was greater in LD, which may have affected the biological activity of mature MSTN. Myostatin propeptide was detected in all muscle fibres; however the mature MSTN was detected to a much lower extent and mainly in slow fibres. Furthermore, MSTN was localized in close proximity to DCN in intermyocellular space, suggesting possible interactions between both proteins and effects on muscle structure and meat quality. The role of MSTN and DCN as well as their interactions in the determination of muscle composition needs to be further elucidated.

Ultrastructure of the Intramuscular Connective Tissue in Bovine Skeletal Muscle

1994 ◽  
Vol 151 (4) ◽  
pp. 250-257 ◽  
Author(s):  
T. Nishimura ◽  
A. Hattori ◽  
K. Takahashi
Keyword(s):  
Skeletal Muscle ◽  
Connective Tissue ◽  
Bovine Skeletal Muscle

Carnosine content in the porcine longissimus thoracis muscle and its association with meat quality attributes and carnosine-related gene expression

Meat Science ◽  
2017 ◽  
Vol 124 ◽  
pp. 84-94 ◽  
Author(s):  
Joël D'Astous-Pagé ◽  
Claude Gariépy ◽  
Richard Blouin ◽  
Simon Cliche ◽  
Brian Sullivan ◽  
...  
Keyword(s):  
Gene Expression ◽  
Meat Quality ◽  
Quality Attributes ◽  
Related Gene
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