scholarly journals Assessment of variability of egg production traits based on analysis of SNP markers and search for traces of selection in the genome of Russian white chickens

2020 ◽  
Vol 18 (4) ◽  
pp. 423-432
Author(s):  
Olga V. Mitrofanova ◽  
Natalia V. Dementieva ◽  
Elena S. Fedorova ◽  
Marina V. Pozovnikova ◽  
Valentina I. Tyshchenko ◽  
...  
Keyword(s):  
Selection Pressure ◽  
Egg Production ◽  
Snp Markers ◽  
Chromosome 8 ◽  
Gwas Data ◽  
Production Traits ◽  
Egg Weight ◽  
Genome Region ◽  
Genomic Regions ◽  
The Relationship

Objective. To assess the variability of egg production traits for nine SNPs, to search for traces of selection in the genome of Russian white chickens based on ROH patterns. Methods. The material for the study was DNA isolated from the blood of Russian white chickens (n = 141). Nine SNPs associated with egg production at p 5.16 105 according to GWAS data were selected for analysis. The frequencies of alleles and genotypes, the relationship between genotypes and characteristics of egg production were calculated, and ROH patterns were identified. Results. Significant differences between genotypes were found in terms of age of laying the first egg (p 0.005) and egg weight (p 0.05). The genomic regions surrounding the target SNPs were analyzed according to the distribution of homozygous regions in them. Conclusions. The substitutions rs317565390 and rs16625488 located in the 4.810.2 Mb region on chromosome 8 showed polymorphism, despite the fact that homozygous loci in this region of the genome are found in 58% of animals. For most SNPs, the prevalence of the frequency of one of the alleles was observed. As a cluster of increased selection pressure, a chick genome region in the 4.810.2 Mb region on chromosome 8 was identified.

scholarly journals Canonical correlation analysis for studying the relationship between egg production traits and body weight, egg weight and age at sexual maturity in layers

2011 ◽  
Vol 50 (No. 4) ◽  
pp. 163-168 ◽  
Author(s):  
Y. Akbaş ◽  
Ç. Takma
Keyword(s):  
Body Weight ◽  
Correlation Analysis ◽  
Canonical Correlation Analysis ◽  
Canonical Correlation ◽  
Sexual Maturity ◽  
Egg Production ◽  
Production Traits ◽  
Egg Weight ◽  
Canonical Correlations ◽  
The Relationship

In this study, canonical correlation analysis was applied to layer data to estimate the relationships of egg production with age at sexual maturity, body weight and egg weight. For this purpose, it was designed to evaluate the relationship between two sets of variables of laying hens: egg numbers at three different periods as the first set of variables (Y) and age at sexual maturity, body weight, egg weight as the second set of variables (X) by using canonical correlation analysis. Estimated canonical correlations between the first and the second pair of canonical variates were significant (P < 0.01). Canonical weights and loadings from canonical correlation analysis indicated that age at sexual maturity had the largest contribution as compared with body weight and egg weight to variation of the number of egg productions at three different periods.  

scholarly journals Heterosis effect in hybrid laying hens

2014 ◽  
Vol 30 (2) ◽  
pp. 303-311 ◽  
Author(s):  
P. Hristakieva ◽  
M. Oblakova ◽  
M. Lalev ◽  
N. Mincheva
Keyword(s):  
Sexual Maturity ◽  
Egg Production ◽  
Live Weight ◽  
Egg Laying ◽  
Production Traits ◽  
Egg Weight ◽  
Group V ◽  
Paternal Line ◽  
Group I ◽  
Heterosis Effect

The new original egg laying lines T, P and N selected at the Institute of Agriculture - Stara Zagora were used. Hybrid ?? ? ??, ?? ? ?? crosses were obtained and used for paternal line. Thereafter, the following breeding schedule of paternal and maternal lines was applied: Group I - (?????)? ?N?; group ?? - (?????)? ?N?; group ??? - ???N?; and group ?V - ???N?. The production traits of original and hybrid birds were recorded: live weight at the age of 8 and 18 weeks, age of sexual maturity in days, 150 days egg production, average egg weight - at 2-week intervals until end of lay; livability, heterosis effect. The live weights of hybrids at 8 and 18 weeks of age were statistically significantly lower compared to original lines. The values of heterosis for this parameter were negative for all four hybrid combinations. The earliest beginning of egg lay occurred in (?????) ? ?N? (162.08 days of age) and ???N? (163.11 days of age). The relative (%) heterosis for age of sexual maturity of studied hybrid combinations had moderate to low negative values. Average egg weights of hybrids were higher and the values of heterosis - positive for all four groups varying from 0.97% to 1.63%. The average 150 days egg production was lower in purebred lines compared to hybrids. The highest average 150 days egg production was determined in ???N? hybrids - 142 eggs. The heterosis effect for egg production in hybrids was significant.

scholarly journals Polymorphism of the melanocortin receptor gene and its association with egg production traits in Lohmann Brown chickens

Genetika ◽  
2018 ◽  
Vol 50 (1) ◽  
pp. 317-323
Author(s):  
Sarah Aggag ◽  
Karim El-Sabrout
Keyword(s):  
Candidate Gene ◽  
Egg Production ◽  
Sequence Data ◽  
Receptor Gene ◽  
Melanocortin Receptor ◽  
Production Traits ◽  
Egg Weight ◽  
Blood Samples ◽  
Mc4r Gene ◽  
Pcr Products

The melanocortin gene (MC4R) was proposed as a candidate gene in this study for egg production traits (yield and weight) in Lohmann Brown hens. Two different primers from MC4R gene (MC4R-1 and MC4R-2) were investigated. DNA from blood samples was extracted to amplify the MC4R gene and the purified PCR products were sequenced. Alignment of sequence data from each group revealed that there is a variation in MC4R-1 at nucleotide 22 (T-G) (sense mutation) for high egg weight. Hens with the genotype produced significantly (P<0.05) higher egg weight compared to hens with the AA and BB genotypes. There was no significant (P>0.05) effect of this mutation on egg yield. There was no variation detected in MC4R-2. The detected mutation and the analysis of egg production means revealed a significant association between MC4R polymorphism and egg weight. The MC4R-SNP could be considered as a useful marker in chicken selection especially for egg weight.

scholarly journals COMPARATIVE INVESTIGATION OF EGG PRODUCTION IN WG, GG AND GL JAPANESE QUAIL POPULATIONS

2018 ◽  
Vol 16 (4) ◽  
pp. 334-343 ◽  
Author(s):  
H. Lukanov ◽  
A. Genchev ◽  
P. Kolev
Keyword(s):  
Japanese Quail ◽  
Egg Production ◽  
Comparative Investigation ◽  
Production Traits ◽  
Feed Conversion ◽  
Egg Weight ◽  
Production Type ◽  
Poultry Breeding

The aim of the study was to evaluate egg production in three heavy Japanese quail populations created and reared in the Poultry Breeding Unit of the Trakia University – Bulgaria, marked as WG, GG and GL. In the experiments, 160 female birds from populations WG and GG, and 96 female birds from population GL were tested up to the 6th production month. The main egg production traits were controlled. The highest egg production for the period was demonstrated in group GL (79.84±4.46%), followed by group GG (76.33±3.40%) and group WG (72.11±4.16%). Quails from the WG group were outlined with least efficient feed conversion per egg (74.49±1.21 g feed), while those from the GL group: with the most efficient one – 64.93±1.41 g (p<0.01). The highest average egg weight in descending order was observed in the WG group (14.04±0.32 g), GG group (13.65±0.27 g) and GL group (12.79±0.29 g). The Japanese quail populations created and maintained at the Trakia University showed a potentially good egg production for the production type they belonged to, which makes them attractive for use in interline hybridisation schedules, including for production of autosexing stock layers.

scholarly journals Relationship between plumage color and eggshell patterns with egg production and egg quality traits of Japanese quails

2021 ◽  
Vol 14 (4) ◽  
pp. 897-902
Author(s):  
Ly Thi Thu Lan ◽  
Nguyen Thi Hong Nhan ◽  
Lam Thai Hung ◽  
Tran Hoang Diep ◽  
Nguyen Hong Xuan ◽  
...  
Keyword(s):  
Egg Production ◽  
Egg Quality ◽  
Phenotypic Diversity ◽  
Quality Characteristics ◽  
Quality Traits ◽  
Plumage Color ◽  
Wild Type ◽  
Egg Weight ◽  
Japanese Quails ◽  
The Relationship

Aim: This study was conducted to identify the diversity of feather color and to determine the relationship between plumage color and egg yield as well as eggshell patterns and internal egg quality traits of Japanese quails. Materials and Methods: For investigating phenotypic diversity, a total of 600 quails from five breeding farms were evaluated to record head feather, shank, and plumage color. An on-station experiment was also conducted on 360 laying quails to examine the relationship between plumage color and egg production and egg weight during 24 weeks of laying. Eggs collected during this period were also used for identifying eggshell patterns and examining their relationship with internal egg quality characteristics. Results: Plumage color was primarily wild-type, with the highest proportion being 56.3% (p<0.001). Brown color was also found at a relatively high proportion in the population (16.7%), followed by black color (11.3%). The egg production and laying rate of quails with wild-type and brown plumage colors also significantly (p=0.001) differed from those of quails with other plumage types. Egg weight was also higher in these quail groups, especially than that of quails with yellow plumage color. Four patterns of eggshell were identified, among which spotted and dark eggshells were predominant (45.2% and 43.1%, respectively); however, patterns did not affect internal egg quality characteristics. Conclusion: Plumage color was primarily wild-type in both male and female quails. Egg yield over a 24-week laying period was superior in quails with wild-type and brown plumage colors, whereas a relationship between eggshell patterns and egg quality traits could not be established.

scholarly journals Differences in oviposition and egg quality of various genotypes of laying hens

2017 ◽  
Vol 62 (No. 9) ◽  
pp. 377-383 ◽  
Author(s):  
E. Tůmová ◽  
J. Vlčková ◽  
D. Chodová
Keyword(s):  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Laying Hen ◽  
Sequence Length ◽  
Production Traits ◽  
Egg Weight ◽  
Egg Shell ◽  
Egg Components

The differences in egg production traits in six laying hen genotypes (brown-egg hens Bovans Brown, Bovans Sperwer, ISA Sussex; white-egg hen Dekalb White; laying hens with tinted shells Moravia Barred and Moravia BSL) and the interactions of genotype and oviposition on egg quality were evaluated. The genotype affected the laying rate (P ≤ 0.003), mean sequence length (P ≤ 0.001), and time of oviposition (P ≤ 0.001). The brown-egg genotypes laid eggs approximately 1 h earlier than the white-egg genotypes and approximately 2 h earlier than the tinted-egg genotypes. Egg shell strength was the lowest in tinted-egg genotypes (P ≤ 0.001) and declined with the time of oviposition (P ≤ 0.002). Egg shell percentage (P ≤ 0.011) and thickness (P ≤ 0.011) were affected by the interaction of genotype and oviposition. None of the effects affected egg weight; however, the proportion of egg components was significantly influenced by the interaction of genotype and oviposition. The study confirmed that the differences in the egg production and egg quality of various genotypes are associated with the laying pattern.

Production traits and hatching of a Barred Rock 1 pure line, its feather sexable strains and their crosses

2012 ◽  
Vol 52 (10) ◽  
pp. 945 ◽  
Author(s):  
Ismail Durmus ◽  
Huseyin Goger ◽  
Sahnur Demirtas ◽  
Sermin Yurtogullari
Keyword(s):  
Rhode Island ◽  
Sexual Maturity ◽  
Egg Production ◽  
Pure Line ◽  
Embryonic Mortality ◽  
Production Traits ◽  
Egg Weight ◽  
Significant Difference ◽  
Early Embryonic Mortality

The study was carried out to identify some production traits of the pure Barred Rock 1 (BR1) line and rapid × slow feathering line crosses derived from the BR1 pure line, in addition to F1 crosses of all these dam lines with Rhode Island Red 1 sire line. The BR1 line previously used a brown layer dam line for barred/non-barred day-old chick auto-sexing and synthetic slow and rapid wing feathering lines. Parent lines showed significant differences in sexual maturity and egg production (P < 0.01) and early embryonic mortality (P < 0.05). However, there was no significant difference in weight at sexual maturity, average egg weight, hatchability of fertile eggs, hatchability of total eggs set, and middle and late embryonic mortalities. A significant difference was found among F1 crosses with respect to weight at sexual maturity (P < 0.05), but no significant difference (P > 0.05) could be determined for age at sexual maturity and egg production. Overall, rapid feathering hens had better production traits than slow feathering hens. The dual crossbred parent lines exhibited almost the same level of egg production traits compared with the pure line.

Estimation of genetic parameters of growth and egg production traits by animal model in IWK layer strain

2019 ◽  
Author(s):  
P. Chandan ◽  
T.K. Bhattacharya ◽  
U. Rajkumar ◽  
L.L.L. Prince ◽  
R.N. Chatterjee
Keyword(s):  
Animal Model ◽  
Body Weight ◽  
Egg Production ◽  
Heritability Estimate ◽  
The Body ◽  
Production Traits ◽  
Economic Traits ◽  
Egg Weight ◽  
Egg Number ◽  
Highly Correlated

Indian White Leghorn strain-IWK has been improved for higher egg weight as well as number over last twelve generations at ICAR-Directorate of Poultry Research, Hyderabad. The data collected on various economic traits of egg production were analyzed using REML approach of animal model. Current study showed that the heritability estimate of body weight, age at sexual maturity (ASM), egg numbers and egg weight was moderate to high, low to moderate, low and high, respectively. The body weight was positively correlated with egg weight but negatively correlated with egg numbers. The body weight at 16 and 20 weeks were negatively correlated with ASM and were very important for achieving early ASM. ASM was negatively correlated with egg numbers. The egg weight regressed as the egg number increased. The part period egg production EP52 was highly correlated with EP64; therefore EP52 can be used for selecting parents for higher egg number instead of EP64.

New polymorphisms of PAPPA and PAPPA2 genes and their associations with egg production traits in Chinese Dagu chickens

2017 ◽  
Author(s):  
D. Liu ◽  
X. L. Niu ◽  
T. L. Tyasi ◽  
N. Qin ◽  
H. Zhu ◽  
...  
Keyword(s):  
Untranslated Region ◽  
Egg Production ◽  
Protein A ◽  
Follicular Development ◽  
Single Strand Conformation Polymorphism ◽  
Nucleotide Polymorphisms ◽  
Production Traits ◽  
Single Nucleotide ◽  
Egg Weight ◽  
Conformation Polymorphism

Pregnancy-associated plasma protein A, pappalysin1 (PAPPA) and pappalysin2 (PAPPA2) genes were implicated in regulation of hen ovarian follicular development and growth. Four novel single nucleotide polymorphisms (SNPs) were identified using PCR-single strand conformation polymorphism (PCR-SSCP) and DNA sequencing. Among them, A/G transition at position 172864 and T/C mutation at position 172952 in 3‘-untranslated region (UTR) of PAPPA named SNP A172864G and T172952C, respectively. A/G transition at position 77421 and T/C at position 77455 in 3‘-UTR of PAPPA2 gene named as SNP A77421G and T77455C, respectively. For SNP A172864G and T172952C (PAPPA), 360 Dagu hens were classified as AA, AB and BB genotypes based on PCR-SSCP patterns, and BB genotype correlated significantly (P less than 0.05) with higher hen-housed egg production (HHEP) at 30 and 57 weeks (wks) of age and higher egg weight (EW) at 43 wks of age. Consequently, these SNPs identified will be potential genetic markers to improve egg productivity in chicken breeding.

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