scholarly journals The Relationship of Feed and Protein Efficiency to Other Egg Production Traits

1976 ◽  
Vol 55 (3) ◽  
pp. 1149-1152 ◽  
Author(s):  
H.L. Marks ◽  
W.M. Britton
Keyword(s):  
Egg Production ◽  
Production Traits ◽  
Relationship Of ◽  
The Relationship

scholarly journals The Relationship of Anatomical Measurements to Egg Production

1934 ◽  
Vol 13 (4) ◽  
pp. 242-249 ◽  
Author(s):  
M. Wayne Miller ◽  
J.S. Carver
Keyword(s):  
Egg Production ◽  
Relationship Of ◽  
The Relationship

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 The role of corticosterone in the regulation of the cellular composition of chicken blood during the stress reaction

2021 ◽  
Vol 282 ◽  
pp. 03003
Author(s):  
M.A. Derkho ◽  
L.N. Sajfutdinova ◽  
V.K. Strizhikov ◽  
S.V. Strizhikova ◽  
T.A. Ponomaryova
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Egg Production ◽  
Secretory Activity ◽  
Regulatory Requirements ◽  
Layer Density ◽  
Relationship Of ◽  
The Relationship ◽  
Chicken Blood

The influence of hen layer density on the variability of the number of red blood cells, heterophiles and lymphocytes in the blood, the secretory activity of adrenal glands, estimated by the level of corti-costerone and cortisol, as well as the presence of interrelations between hormones and blood cells by calculating complex indices, were studied. Chickens, as the research object, were kept in cages, under conditions of standard layer density and increased by 1.5 and 2.0 times. We found that chickens adapt to an increase in layer density by one and a half times, pro-vided that egg production decreases to 33.33%; two times exceed of the regulatory requirements for laying does not correspond to the adaptive abilities of birds. Depending on the level of layer density excess (stress factor) in chicken blood, the concentration of corticosterone and cortisol increases, determining a decrease in the number of lymphocytes and an in-crease in heterophiles against the background of the preservation of red blood cells, reflecting the “energy price” of adaptation. Corticosterone af-fects the relationship of red blood cells with lymphocytes and heterophiles, determining the variability of the values of the indices reflecting the ratio of red blood cells and lymphocytes (ISEL), red blood cells and hetero-philes (ISEG), red blood cells, lymphocytes and corticosterone (ISELC), red blood cells, heterophiles and corticosterone (ISEGC) and the integral index of red blood cells-heterophiles-lymphocytes and corticosterone (IIEGLC).

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