scholarly journals Genetic markers of meat productivity of the Romanov sheep breed: IGFBP-3, GHo и CAST

2021 ◽  
pp. 36-40
Author(s):  
Mikhail N. Kostylev ◽  
Marina V. Abramova ◽  
Anna V. Ilyina ◽  
Maria S. Barysheva ◽  
Yulia I. Malina ◽  
...  
Keyword(s):  
Gene Polymorphism ◽  
Selection Process ◽  
Molecular Genetic ◽  
Live Weight ◽  
Molecular Genetic Analysis ◽  
Speed Up ◽  
Meat Productivity ◽  
Genetic Assessment ◽  
Type 3 ◽  
Igfbp 3

Relevance and methods. For molecular genetic analysis, samples taken from Romanov sheep in micro-populations of the Yaroslavl region from the ear by pluck were isolated. Polymorphism of genes of the type 3 protein that inhibits insulin-like growth factor (IGFBP-3), growth hormone (Gh), and calpastatin (CAST) in micro-populations of Romanov sheep of the Yaroslavl region was studied. A selection and genetic assessment of live weight indicators of sheep by age periods, depending on the genotype, was carried out.Results. Two variants of IGFBP-3 gene polymorphism were identified: homozygote (FF) and heterozygote (FG). The frequency of F and G alleles was 94% and 6%, respectively No animals carrying the gg genotype were identified in the study population. Evaluation of gene polymorphism in the population GHo Romanov sheep showed the presence of three genotypes AA, AB and BB with frequency of allele A and b — 63% and 37%, respectively. When evaluating the CAST gene polymorphism, 3 MM, MN, and NN genotypes were identified with different frequency of occurrence. The ratio of M and N alleles in the population was 74% and 26%, respectively. Indicators of observed (Ho) and expected (He) heterozygosity for the studied genotypes are in the range of 0.11...0.62 and 0.10...0.47, respectively. It was found that animals with the IGFBP-3FG genotype had a significantly higher live weight at the age of 10 months compared to carriers of the IGFBP-3FF genotype by 5.7%. For the GHo gene, the greatest significant superiority in live weight in all the studied age periods was found in individuals with the GHoAB genotype, which ranged from 0.5% to 12.9%. Animals with the CASTMM genotype outperformed animals with the CASTMN and CASTNN genotypes at 5 months of age by 5.61% and 14.8% and at 10 months of age by 4.53% and 11.3%, respectively. The conducted research will speed up the selection process and increase the profitability of the industry.

Evaluation Yorkshire and Landrace breeds of pigs according to PRKAG3, MC4R and MYOD1 marker genes

2021 ◽  
pp. 28-35
Author(s):  
A. Balnikov ◽  
I. Gridyushko ◽  
Yu. Kazutova ◽  
M. Mikhailova ◽  
E. Romanishko
Keyword(s):  
Molecular Genetic ◽  
Live Weight ◽  
Integrated System ◽  
The Body ◽  
Breeding Value ◽  
Feed Consumption ◽  
State Enterprise ◽  
Marker Genes ◽  
Productive Traits ◽  
Meat Productivity

Purpose: evaluation of pigs Yorkshire rocks and Landraz on PRKAG3, MC4R and MyOD1 markers.Materials and methods. The paper presents the analysis of the results of genetic testing, and determines the frequency of alleles and genotypes of Yorkshire and Landrace breeds at the State Enterprise ZhodinoAgroPlemElita" of the Minsk region of the Republic of Belarus by the genes-markers of productive traits: PRKAG3, MC4R and MYOD1. Zootechnical and molecular genetic methods were used in the research (PCR/PDRF). Snapshot analysis was developed for the genotyping of pigs to detect polymorphic markers of meat-feeding productivity of pigs on the Genas PRKAG3, MyOD1, MC4R. At the first stage, there was an assessment of tribal young (173 heads) on its own productivity in terms of indicators: the age of achieving the living mass of 100 kg, the average daily increase (d) from birth to the live weight of 100 kg, the length of the body (cm), the lifetime meat quality of the thickness of the scrape (mm), height of the longest back muscles (mm), the content of meat in the body (%). At the second stage of the research, the controlling fastenings of 200 goals of pigs and evaluation of feedst and meat qualities in the following indicators were carried out: the age of achieving a living mass of 100 kg (days), the average daily increase (d), feed consumption per 1 kg of growth (to. Units). Also determined: the length of the carcass (cm), the slaughter output (%), the thickness of the spick over 6-7 breast vertebrae (mm), the area of "muscular eye" (cm2), the mass of the rear third of the half carcass (kg), the flow of meat in the carcus (%). Then, genetic studies were compared with productivity indicators.Results. As a result of the research, it was found that in the tested animals, the frequency of the preferred allele I-PRKAG3 made 0.171-0.288, A-MC4R – 0.243-0.315, and C-MYOD1 – 0.064-0.477, respectively. The developed comprehensive system for assessing the breeding value of Yorkshire and Landrace pigs based on the marker genes PRKAG3, MC4R, and MYOD1 allowed us to identify the preferred alleles and determine correlation with productivity traits that provided increase in the average population values: for self-productivity - by 2-4%, for fattening traits - by 2.7-12.5%, for meat traits - by 2.8-34.4 %.Conclusion. The use of integrated system in pig breeding will speed up the selection work to increase the indicators of fattening and meat productivity of the created breeding herds of Yorkshire and Landrace pigs.

scholarly journals Qtl-Genes in Breeds and Hybrids of Ukrainian Sheep

2020 ◽  
Vol 74 (3) ◽  
pp. 215-221
Author(s):  
Vasyl’ Iovenko ◽  
Yurii Vdjvichenko ◽  
Igor Gorbatenko ◽  
Kostantyn Skrepets ◽  
Ilona Hladii ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Genetic Relationships ◽  
Molecular Genetic ◽  
Live Weight ◽  
Gene Pools ◽  
Growth Hormone Gene ◽  
Homozygous Genotype ◽  
Meat Productivity ◽  
High Level ◽  
Genotype A

AbstractFor the first time, the genetic structure of sheep breeds (Ascanian Fine-Fleeced, Ascanian Meat-and-Wool, AND Ascanian Karakul) and the hybrid Ascanian Fine-Fleeced × Texel was studied for structural gene variants: growth hormone, calpastatin, myostatin, and Booroola bone morphogenetic protein. In all studied groups, sheep were characterised by polymorphism of two loci, growth hormone and calpastatin. Two genotypes (A/A, A/B) represent genes of growth hormone structure, and three (M/M, M/N, N/N) represent genes of calpastatin structure. Other genes are in a monomorphic state. Analysis of the genetic relationships between the studied gene pools showed that there was a definite relationship between productivity of sheep herds and their molecular genetic parameters. Thus, the frequencies of individual genotypes and alleles change in the direction from Fine-Fleeced animals to sheep bred for meat productivity. For example, the heterozygous genotype A/B proportion of growth hormone gene increases in this direction from 0% to 38.2%, and allele A from 0.083 to 0.191. The live weight of Fine-Fleeced lambs with geno-type A/B at birth was 4.5 kg, and with homozygous genotype A/A — 4.9 kg (p < 0.001). This difference is genetically related to the meat productivity of sheep. A similar relationship was established for young Ascanian Karakul sheep. According to the distribution of polymorphic loci variants, the gene pools of Ascanian Meat-and-Wool breed and cross-bred animals are most similar closest among themselves, which is explained by the same direction of their productivity. At the same time, all populations are in genetic equilibrium according to Hardy-Weinberg equations, which indicates a high level of their consolidation. Sheep, which have the A/A homozygote of the gene growth hormone, have increased body weight.

scholarly journals Frequency of Cytokine Gene Polymorphism in Full-Term Newborns with Hypoxic Events

2020 ◽  
Vol 5 (4) ◽  
pp. 21-27
Author(s):  
M. S. Panova ◽  
A. S. Panchenko ◽  
B. S. Pushkarev
Keyword(s):  
Gene Polymorphism ◽  
Brain Damage ◽  
Molecular Genetic ◽  
Molecular Genetic Analysis ◽  
Full Term ◽  
Control Group ◽  
Cytokine Gene ◽  
Cytokine Gene Polymorphism ◽  
Blood Leukocytes ◽  
Intrauterine Hypoxia

Background. An infant brain damage is an extremely urgent problem, this pathology is difficult to prevent, and subsequently it manifests itself with a variety of neurological consequences. Various mechanisms are involved in neurodamage; cytokines, as well as genes that control their activity, are under a great concern today. However, there is little data about their role as predictors of the brain damage among children after hypoxia. Aim of the research. To identify the frequency of cytokine gene polymorphism: interleukin (IL)-1β(C-511T), IL-1β(C3953T), IL-4(C589T), IL-6(C174G), IL-10(C819T), IL-10(G1082A) among newborns with hypoxic events. Materials and methods. The study involved 128 full-term newborn patients with hypoxic events: the first group (n = 48) included newborns who experienced chronic intrauterine hypoxia (CVH), the second group (n = 80) included newborns born in asphyxiation. Control group (52) included babies born without asphyxia and not suffering from CVH. A retrospective analysis of case-records was carried out. The material for molecular genetic analysis was DNA samples isolated from umbilical cord blood leukocytes using DNA Express Blood reagents (Scientific and Production Company LITECH, Moscow). Results. Compared to the control group (p = 0.03) children born in asphyxia had their T allele IL-1β (C-511T) prevailed. The group of newborn who had CVH had their TT genotype (p = 0.04) and the T IL-1β allele (C-511T) (p = 0.01) prevailed compared to the control group. In the same study group while studying the polymorphism of the IL-1β gene, the T allele (p = 0.03) at the point C3953T prevailed, in contrast to the control group. Conclusion. Due to the fact that cytokines are part of a reaction cascade leading to the secondary brain damage, under the action of hypoxia, it was found that among newborns undergoing asphyxia and chronic intrauterine hypoxia the increased frequencies of carriage of IL-1β-511TT and IL-1β-3953TT genotypes, and IL-1β-511T and IL-1β-3953T alleles increase the risk of neurodamage.

scholarly journals Meat performance and waste polymorphism rabbit domestic and foreign selection

1970 ◽  
Vol 21 ◽  
pp. 243-247
Author(s):  
O. V. Boiko ◽  
O. F. Honchar ◽  
O. M. Havrysh ◽  
Ye. A. Shevchenko
Keyword(s):  
Genetic Diversity ◽  
High Performance ◽  
Selection Process ◽  
Live Weight ◽  
Issr Markers ◽  
Population Diversity ◽  
Issr Marker ◽  
Issr Analysis ◽  
Study Population ◽  
Meat Productivity

Aim. Clarification of waste polymorphism of different breeds of rabbits and their meat productivity in modern rabbit farm. Methods. Livestock combined with ISSR-analysis of genetic diversity that characterize populations of rabbits of different breeds. Results. Indicators meat productivity rabbit populations studied species differ rates and average daily live weight increments have specialized meat breed versus combined. In addition, the results of ISSR-analysis of three populations of rabbits in Cherkassy region showed relatively high levels of genetic diversity of species. Conclusions. High performance speakers live weight of young rabbits New Zealand and Californian species can be explained lengthy selection process in the areas of high-intensity growth animals breed Poltava silver combinations breed. Genetic studies found that populations are characterized by a sufficient level of polymorphism. The proportion of waste for GST genetic diversity ISSR-marker (ACC) 6G was 72.4 % and for (AG) 9C and (GA) 9C was lower by 33.7 % and 27.8 % respectively. The highest population diversity DST turned on (ACC) 6G ISSR-marker, and the lowest – (AG) 9C. Keywords: breed rabbits, live weight, the study population, ISSR-markers.

scholarly journals INFLUENCE OF BLOOD GROUPS, CAST AND BLG GENES ON PRODUCTIVITY OF THE SHEEP AND GOATS OF THE ALTAY REPUBLIC

2018 ◽  
Vol 48 (4) ◽  
pp. 63-71
Author(s):  
G. M. Goncharenko ◽  
N. V. Grishina ◽  
T. S. Khoroshilova ◽  
I. V. Romanchuk ◽  
T. B. Kargachakova ◽  
...  
Keyword(s):  
Genetic Similarity ◽  
Molecular Genetic ◽  
Live Weight ◽  
Molecular Genetic Analysis ◽  
Pcr Analysis ◽  
Dna Diagnosis ◽  
Genetic Characteristics ◽  
High Productivity ◽  
The Republic ◽  
Cast Gene

The use of genetic markers in addition to traditional methods of animal selection with desirable genotypes allows to increase the share of animals with high productivity in the next generations and ensures improvement of breeding efficiency. Genetic features of the Prikatun type of the Gorno-Altay semi-fine wool breed of sheep and the white downy goat breed in the Republic of Altay were studied by the method of immunogenetic and molecular genetic analysis. The frequency of antigenic factors was identified and the index of genetic similarity between goats and sheep and their separate herds was calculated. Gene polymorphism of β-lactoglobulin (BLG) and calpastatin (CAST) was revealed by the method of DNA diagnosis. Population and genetic characteristics of the herds was studied by the genes specified. Associative genotype relation to productivity and quality of the produce obtained was analyzed. The index of genetic similarity between the goats and the sheep was at the level of 0.713, between the separate herds of the goats the index was 0.861. The ratio of genotypes in the BLG gene determined by PCR analysis in the white downy goats was S1S1– 16.1%; S1S2– 50.6%; S2S2– 33.3%. In the Prikatun type two genotypes were identified in this gene: BB with the frequency of 59.2%, and AB – 40.8%. Two different alleles were identified in the CAST gene of sheep (M and N). The genotype MM was the predominant variant in the CAST sheep gene, whose frequency was 88%. The frequency of occurrence of animals with NN genotype was 1%, MN – 11%. It was shown that the gene equilibrium in the herds was not broken, χ2= 0.931. It was noted that heterozygous goats (S1S2) by BLG gene had a higher live weight by 0.30-0.61 kg compared to other variants of BLG gene (p<0.05). It was also found that lambs with genotype MM of the CAST gene had a higher live weight by 5.5 kg than MN heterozygotes (p< 0.01). However, this difference was not revealed in other age and sex groups of animals.

scholarly journals VON WILLEBRAND DISEASE: CLINICAL, COAGULOGICAL, MOLECULAR AND GENETIC DATA COMPARISON

2019 ◽  
Vol 64 (3) ◽  
pp. 246-255
Author(s):  
D. M. Chernetskaya ◽  
E. A. Likhacheva ◽  
O. S. Pshenichnikova ◽  
V. L. Surin ◽  
N. I. Zozulya
Keyword(s):  
Molecular Genetic ◽  
Genetic Data ◽  
Molecular Genetic Analysis ◽  
Disease Type ◽  
Von Willebrand Disease ◽  
World Population ◽  
Molecular Genetic Data ◽  
Major Mutation ◽  
Type 3 ◽  
Von Willebrand

Introduction. Von Willebrand disease (vWD) — one of the most common coagulopathies — is characterised by a rather complicated inheritance pattern, which can be either dominant or recessive depending on the disease type. Aim. To compare clinical, coagulological and molecular genetic data obtained when examining patients with various types of vWD.Materials and methods. The vWF gene exons were sequenced in 16 patients suffering from VWD using the Sanger method.Results. In total, 12 various mutations were identified, one of which (Pro2527His) has not been previously observed in the world population. The c.2435delC microdeletion being a major mutation in many European countries was found to be the most common. This microdeletion was observed in 9 patients, 6 of whom had the most severe recessive form of the disease — type 3 (3 homozygotes). In two patients, this disorder was accompanied by the missense mutation Thr791Met, which allowed the authors to diagnose a rather rare recessive variant of vWD — 2N. In general, the data obtained by molecular genetic analysis correlated with the differential diagnosis of the vWD type, which is based on the clinical picture of the disease and coagulological properties. In only one case, the Arg1374Cys mutation characteristic of type 2 VWD (A/M) was observed in a patient with the alleged type 1 vWD. Most of the mutations were found in exons 18 (mainly c.2435delC deletion) and 28 which makes them the most perspective exons for the mutation search.Conclusion. The search for mutations in the vWF gene should start from exons 18 and 28. The obtained information provides a basis for developing an economical algorithm aimed at searching for mutations in the vWF gene in our counrtry vWD patients. 

scholarly journals THE RELATIONSHIP OF LACTOFERRIN GENE WITH MILK PRODUCTION AND ITS COMPONENT IN HOLSTEIN COW

2017 ◽  
Vol 48 (1) ◽  
Author(s):  
Alkudsi & Shaker
Keyword(s):  
Gene Polymorphism ◽  
Milk Fat ◽  
Molecular Genetic ◽  
Molecular Genetic Analysis ◽  
Breeding Strategy ◽  
Lactation Period ◽  
College Of Agriculture ◽  
Cattle Farm ◽  
Lactoferrin Gene ◽  
Physiology Laboratory

This resesrch was conducted at the Dairy Cattle Farm pertaining to the Department of Animal Production, College of Agriculture in Abu-Ghraib (20 km West of Baghdad) and Al-Jaderiah, as well as at the Biotechnology  Physiology Laboratory at the College of Agriculture, University of Baghdad , Al-Jaderiah, and in collaboration with the Laboratory that specific for molecular genetic analysis during the period from 27/11/2015 to 1/04/2016. The objective of this study was to identify the polymorphism of  lactoferrin gene and their relationship with some growth and productive traits for 28 Holstein cows and their borns, along with the study of some immunological indicators. The distribution percentages of lactoferrin gene polymorphism in cow's sample were 17.86 and 82.14 % for AA and AB respectively. The variation between these percentages were highly significant (P≤0.01). The allele frequency for A and B were 0.59 and 0.41 respectively, according to the lactoferrin gene analysis carried out currently.  The effect of lactoferrin gene polymorphism on milk yield was highly significant (P≤0.01), being cows with AB yielded 2447.37 ± 209.06 kg, while those with AA yielded 1205.70 ± 120.14 kg. The lactation period has not significantly affected by lactoferrin gene polymorphism. The influence of lactoferrin gene polymorphism was obvious on milk fat (P≤0.01) and ash (P≤0.05) percentages, while other milk components (lactose, protein and solid non-fat) did not. It can be concluded from the study of gene expression for lactoferrin gene, the possibility of adopted them in cattle breeding strategy,. We also recommend to apply the study on a larger sample and for several productive lactions that will give more accurate results from the application of culling and replacement strategies.

scholarly journals Coital exanthema of horses: diagnosis and identification of the pathogen

2018 ◽  
Vol 2018 (6) ◽  
pp. 5-8
Author(s):  
Константин Юров ◽  
Konstantin Yurov ◽  
Светлана Алексеенкова ◽  
Svetlana Alekseenkova
Keyword(s):  
Molecular Genetic ◽  
External Genitalia ◽  
Molecular Genetic Analysis ◽  
Nucleotide Sequences ◽  
Equine Herpesvirus ◽  
Herpesvirus Type ◽  
Equine Herpesvirus Type ◽  
Equine Herpesvirus Type 1 ◽  
Type 3 ◽  
High Degree

Comprehensive studies were performed during an acute outbreak of horses with symptoms of exanthematous lesions of the external genitalia, observed in 2018. The lesion of the external genital organs was observed in the form of puffiness of the vestibule of the vagina and vulva in mares and prepuce in stallions, formation on the mucous membrane and skin of papules, vesicles and pustules, in the last stage - ulceration and crusts on the affected areas. A fragment of the genome of equine herpesvirus type 3, the causative agent of coital exanthema, was found in scrapings from the affected areas using the methods of molecular genetic analysis. The results of the determination of nucleotide sequences showed a high degree of phylogenetic relationship with the strain «YS-1» isolated from sick horses in Japan in 2017. The homology of alignment of nucleotide sequences within the studied region of the genome ― a fragment of the gpG gene (813…1292 bp) ― was 100 %. In 90 % of the samples containing the DNA of the coital exanthema virus, DNA of the virus of rhinopneumonia-viral abortion (equine herpesvirus type 1) was also found, and only in 10 % of cases monoinfection of EHV-3 was observed. Participation in the EHV-1 infectious process was confirmed by a retrospective serological study. In NT, antibodies to EHV-1 were detected in a titer of 1: 16…1: 32. A comparative analysis of retrospective data showed that a similar outbreak of coital exanthema observed in 1980–81 was due to EHV-3 monoinfection.

scholarly journals Effect of IL4-589C>T, FCGR2A-166His>Arg, DEFB1-20G>A, DEFB1-52G>A gene polymorphisms on TNFα, IL-1β, IL-4, and IL-10 contents in the patients with primary hip osteoarthrosis

2020 ◽  
Vol 22 (5) ◽  
pp. 1009-1016
Author(s):  
A. M. Miromanov ◽  
T. V. Zabello ◽  
N. A. Miromanova
Keyword(s):  
Gene Polymorphism ◽  
Gene Polymorphisms ◽  
Inflammatory Diseases ◽  
Molecular Genetic ◽  
Vascular Diseases ◽  
Fold Increase ◽  
Molecular Genetic Analysis ◽  
Radiographic Examination ◽  
Control Group ◽  
Hip Joints

Our objective was to study the effects of IL4-589C>T, FCGR2A-166His>Arg, DEFB1-20G>A, DEFB1-52G>A gene polymorphisms upon content of TNFα, IL-1β, IL-4, and IL-10 in primary osteoarthrosis of the hip joints. We performed a survey of 100 patients of Russian ethnicity (average age 61.3±8.5 years) with primary coxarthrosis at the stage III-IV who lived in the Trans-Baikal region. The control group (n = 100), were local residents, comparable by age (60±8.3 years), gender, habitation place and nationality. The exclusion criteria were as follows: close relationship; other types of osteoarthritis (post-traumatic, rheumatoid, metabolic, etc.); dysplastic syndromes and phenotypes; acute and chronic inflammatory diseases at the exacerbation stage; diabetes mellitus; osteoporosis; vascular diseases; obesity; malignant neoplasia; alcohol abuse. Along with clinical examination, the following laboratory methods were applied: immunological techniques, i.e., determination of TNFα, IL-1β, IL-4, IL-10; genetic testing using polymerase chain reaction, e.g., a point mutation of the IL4 gene at the 589(C>T) position, FCGR2A at 166(His>Arg) site, DEFB1 at the 20(G>A) and 52(G>A) positions. DNA from the peripheral blood of patients was used for the molecular genetic analysis. Radiographic examination was also carried out. The data were statistically processed using STATISTICA 6.1 software package (StatSoft, USA), Microsoft Office Excel 2019 for Windows 10. The differences were considered statistically significant at p ≤ 0.05. Results. The -589T/T genotype of IL4-589C>T gene polymorphism indirectly contributes to higher content of TNFα and IL-1β for primary osteoarthritis of the hip joints. The patients with -166Arg/Arg genotype have a 1.3-fold increase of certain cytokine concentrations, e.g., TNFα and IL-1β, as compared with -166His/Arg genotype, and, conversely, lower content of IL-4 and IL-10 (1.3- fold) in comparison with -166His/His genotype. The patients with -20A/A genotype showed higher levels of TNFα and IL-1β, respectively, 1.2 and 1.3 times, compared with -20G/G genotype, and 1.3 times versus the -20G/A genotype. Conclusions: 1. The presence of -589T/T genotype of the IL4-589C>T gene polymorphism and the -20A/A genotype of the DEFB1-20G>A gene polymorphism contributes to a high content of TNFα and IL-1β in the blood serum, and the carriage of -166His/His FCGR2A-166His>Arg gene polymorphism is associated with both higher level of TNFα, IL-1β, and a low concentration of IL-4, IL-10. 2. Complex carriers of FCGR2A166HisArg x DEFB152AA x DEFB120AA x IL4589TT genotypes in the patients with primary coxarthrosis increases the contents of TNFα, IL-1β cytokines by 1.5 and 1.7 times, respectively.

scholarly journals Biochemical and histological indicators of blood and m. longissimus dorsi of young bulls of Kazakh white-headed breed of different genotypes by the CAPN1 and GH genes

2020 ◽  
Vol 5 (2) ◽  
pp. 20-25
Author(s):  
M. I. Selionova ◽  
V. R. Plakhtyukova
Keyword(s):  
Fatty Acids ◽  
Muscle Tissue ◽  
Unsaturated Fatty Acids ◽  
Saturated Fatty Acids ◽  
Molecular Genetic ◽  
Average Daily Gain ◽  
Live Weight ◽  
Young Cattle ◽  
Meat Productivity ◽  
Daily Gain

The use of molecular genetic markers for productivity is one of the modern approaches in breeding beef cattle. The article presents the results of the studies on the influence of genotypes by the calpain (CAPN1) and growth hormone (GH) genes on live weight, fatty acid composition of blood plasma, quantitative and qualitative indicators of meat of young cattle of Kazakh white-headed breed. It was established that animals of the homozygous geno-types СС–CAPN1 and VV-GH had a larger live weight and its average daily gain on the 240th and 365th days. Their superiority over the GG and LL genotypes was 13.8% (P<0.05) and 6.9%; 14.6% (P<0.05) and 6.9%, respectively. The carriers of the desirable alleles in the homozygous state had the sum of unsaturated fatty acids higher by 6.3% and 7.1%, respectively, than the young bulls, in which genotypes they were absent. The predominance of unsaturated fatty acids over saturated fatty acids also determined lower values of lipid me-tabolism direction index (0.92 and 1.00) in the animals with the desirable genotype. Muscle tissue of animals of the СС and VV genotypes was characterized by a higher level of protein, fat by 0.28–2.13 abs. per cent, energy value, and the quantity of muscle fibers with a smaller diameter per unit area compared to the GG and LL genotypes by on average 8.7% and 25.5% (P<0.01). Due to the greater number of interfiber fat inclusions, muscle tissue of the desirable genotypes received higher marbling scores. The obtained data testify to the prospects of replication of animals, which genotype has the desirable alleles for further improvement of traits of meat productivity of Kazakh white-headed breed.

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