Analysis of phenotypic and genetic parameters of muscle fibre number and its relationship to flesh quality traits

Aquaculture ◽  
2007 ◽  
Vol 272 ◽  
pp. S296-S297
Author(s):  
A. Norris
Keyword(s):  
Muscle Fibre ◽  
Genetic Parameters ◽  
Quality Traits ◽  
Flesh Quality ◽  
Fibre Number

Sources of variation in myofibre number within and between litters of pigs

1991 ◽  
Vol 52 (3) ◽  
pp. 527-533 ◽  
Author(s):  
C. M. Dwyer ◽  
N. C. Stickland
Keyword(s):  
Muscle Fibre ◽  
Significant Contribution ◽  
Large White ◽  
Significant Difference ◽  
Fresh Frozen ◽  
Sources Of Variation ◽  
Fibre Number ◽  
Acid Stable ◽  
Total Muscle ◽  
Secondary Fibre

ABSTRACTA study of the determinants of inter- and intra-litter variation in muscle fibre number was carried out on five litters of Large White piglets. Fresh frozen, whole mid-belly sections of m. semitendinosus were stained to demonstrate acid-stable myosin adenosine triphosphatase activity. From these sections it was possible to identify which fibres had developed as primary and which as secondary fibres. Estimations of total muscle fibre number, total primary fibre number and ratio of secondary fibres to primary fibres were made for each animal. Results demonstrated that primary fibre number varied between litters (P<0·01) and was responsible for the variation in total muscle fibre number (P < 005) between litters since there was no significant variation in secondary: primary ratio. Within-litter differences in total fibre number could be attributed to both the secondary: primary ratio and primary fibre number, in almost equal contributions. However, when only the largest and smallest extremes of the litters were compared, variation in fibre number was due to the significant difference in the secondary: primary ratio (P<0·01). Taken as a whole, the results appear to show that primary fibre number is responsible for all the variation in muscle fibre number between litters, and also makes a significant contribution, with secondary: primary fibre ratio, to the variation present within a litter. The factors responsible for variations in primary and secondary fibre numbers are discussed.

scholarly journals Meat quality traits and muscle composition of cows differing in lactation performance

2012 ◽  
Vol 55 (1) ◽  
pp. 36-47 ◽  
Author(s):  
M. Hamada ◽  
E. Albrecht ◽  
A.-R. El Bagory ◽  
A.-B. Edris ◽  
H. M. Hammon ◽  
...  
Keyword(s):  
Body Composition ◽  
Cell Size ◽  
Muscle Fibre ◽  
Meat Quality ◽  
Quality Traits ◽  
Lactation Performance ◽  
Fat Cell ◽  
Muscle Structure ◽  
Meat Quality Traits ◽  
The Impact

Abstract. Beef and dairy cows differ in the way in which they utilise nutrients and in accretion or mobilisation of body reserves during lactation. Thus far, little is known about the impact of lactation performance on body composition, meat quality, and the related muscle structure of cows with a defined, combined beef and dairy genetic background. In the described experiment, 50 F2 cows, originating from mating Charolais bulls to German Holstein cows and a following intercross of F1 individuals, were slaughtered during the second lactation, 30 days after calving. Cows were assigned to 3 groups, each containing representatives of 3 families, according to lactation performance. Standard carcass and meat quality traits were determined. Additionally, samples from longissimus muscle were investigated by histology and computer image analysis for muscle fibre profile, intramuscular fat cell size, and marbling traits. Subcutaneous fat cell size was measured to estimate the impact of lactation on body fat reserves. The results suggest no influence of the duration of the first lactation on body composition, meat quality or muscle structure. However, the amount of milk per day influenced body weight, body composition, and marbling traits. Relationships between traits were low, but showed consistently that increasing milk yield was negatively correlated with tissue accretion. Changes of muscle fibre and fat cell profile, indicating protein or fat mobilisation by lactation, could not be detected. In the presented study, lactation had only minor consequences for meat quality.

scholarly journals Genetic parameters of some carcass and meat quality traits in Betong chicken (KU line)

2018 ◽  
Vol 52 (3) ◽  
pp. 274-279 ◽  
Author(s):  
Panatda Bungsrisawat ◽  
Sornthep Tumwasorn ◽  
Wiriya Loongyai ◽  
Sasitorn Nakthong ◽  
Panwadee Sopannarath
Keyword(s):  
Meat Quality ◽  
Genetic Parameters ◽  
Quality Traits ◽  
Meat Quality Traits

TEMPERATURE AND MYOGENIC FACTOR TRANSCRIPT LEVELS DURING EARLY DEVELOPMENT DETERMINES MUSCLE GROWTH POTENTIAL IN RAINBOW TROUT(ONCORHYNCHUS MYKISS) AND SEA BASS (DICENTRARCHUS LABRAX)

2001 ◽  
Vol 204 (16) ◽  
pp. 2763-2771 ◽  
Author(s):  
D. WILKES ◽  
S. Q. XIE ◽  
N. C. STICKLAND ◽  
H. ALAMI-DURANTE ◽  
M. KENTOURI ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Muscle Fibre ◽  
Early Development ◽  
Sea Bass ◽  
Growth Potential ◽  
Mrna Levels ◽  
European Sea Bass ◽  
Transcript Levels ◽  
Fibre Number ◽  
Sea Bass Larvae

SUMMARY The influence of changes in environmental temperature on the mRNA levels of myogenic regulatory factors (MRFs), i.e. MyoD and myogenin, as well as myosin heavy chain (MyHC) were studied during early larval development in rainbow trout and sea bass. Phosphoimager analysis of northern blots indicated that there is an optimum temperature for the RNA transcript levels of MRF and MyHC RNA in trout and in sea bass larvae. In the trout strain studied, the highest concentration for MRF and MyHC transcripts was found at 8°C rather than 4°C or 20°C. In European sea bass, the highest concentrations of MRF and MyHC mRNA were observed at 15-20°C rather than 13°C. Raising sea bass larvae at 15°C was associated with higher MyHC gene expression as well as a trend towards an increase in total muscle fibre number and higher growth rates after transfer at ambient temperature. Results suggest that mRNA levels of MRF and MyHC can be used to optimise early development. An experiment in which the temperature was changed illustrates the consequence of precise temporal expression of MRF genes in specifying muscle fibre number at critical stages during early development.

scholarly journals Estimation of genetic parameters of fatty acids composition in flesh of market size common carp (Cyprinus carpio L.) and their relation to performance traits revealed that selective breeding can indirectly affect flesh quality

2018 ◽  
Vol 63 (No. 7) ◽  
pp. 280-291 ◽  
Author(s):  
M. Prchal ◽  
M. Vandeputte ◽  
D. Gela ◽  
M. Doležal ◽  
H. Buchtová ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Common Carp ◽  
Genetic Parameters ◽  
Selective Breeding ◽  
Market Size ◽  
Pufa Ratio ◽  
Flesh Quality ◽  
Supplemental Feed ◽  
Fa Composition ◽  
Performance Traits

Fish are a rich source of omega-3 polyunsaturated fatty acids (n-3 PUFAs) and thus, they should be an integral part of human diet at least twice a week. As a result, high attention has been devoted to the improvement of fatty acids (FA) content in the flesh of farmed fish through nutrition. Conversely, there are very few data on the potential of selective breeding to improve FA composition in fish. We estimated genetic parameters of fillet fatty acid content and performance traits in market size common carp cultured under semi-intensive pond conditions. The experimental stock arose through factorial mating of 7 dams and 36 sires. All families were reared communally. Pedigree was reconstructed with microsatellite markers, and 158 individuals were dressed out and selected for flesh FA composition analysis. Heritability estimates of total muscle fat, FA composition in total fat (TF) (n-3 PUFA-TF, PUFA-TF, EPA-TF – eicosapentaenoic acid, n-6/n-3 – omega6/omega3 PUFA ratio), and most performance traits were moderately heritable (h² = 0.23–0.41), and body weight was highly heritable (h<sup>2 </sup>= 0.62 ± 0.20). Genetic correlations show that selection for faster growth would indirectly lead to fillet yield improvement (r<sub>g </sub>= 0.50–0.62) while having little impact on muscle fat (r<sub>g </sub>= 0.21). However, lipid quality in flesh would be affected: n-3 PUFA-TF would decrease and the n-6/n-3 PUFA ratio would increase. A likely interpretation is that faster growing genotypes consume more supplemental feed, which was poor in the beneficial FAs. For sustainable selective breeding, supplemental feed composition should be modified, so that faster growing carps would maintain an appropriate flesh quality.

Sign in / Sign up

Export Citation Format

Share Document