scholarly journals Selection for Increased Incidence of Blood Spots in White Leghorns

1951 ◽  
Vol 30 (5) ◽  
pp. 748-757 ◽  
Author(s):  
I. Michael Lerner ◽  
Lewis W. Taylor ◽  
Dorothy C. Lowry
Keyword(s):  
Blood Spots ◽  
White Leghorns ◽  
Selection For

CORRELATED RESPONSES IN EGG QUALITY TRAITS TO SELECTION FOR EARLY BODY WEIGHT IN MEAT-TYPE CHICKENS

1972 ◽  
Vol 14 (3) ◽  
pp. 477-482 ◽  
Author(s):  
V. Buvanendran ◽  
E. S. Merritt
Keyword(s):  
Body Weight ◽  
Egg Quality ◽  
Correlated Response ◽  
Quality Traits ◽  
Correlated Responses ◽  
Egg Weight ◽  
Shell Color ◽  
Blood Spots ◽  
Selection For ◽  
Meat Type

The correlated responses in egg quality traits to selection for high early body weight were studied in seven meat-type populations comprising five selected and two control lines. Traits studied were specific gravity, egg weight, albumen height, Haugh units, shell color, egg shape, shell roughness, wrinkling and asymmetry, and incidence of blood spots, meat spots and double yolks. Significant (P < 0.05 or < 0.01) correlated changes, as determined by the regression of correlated response (egg quality traits) on primary response (body weight), were obtained for egg weight, albumen height, Haugh units, asymmetry of shell and blood spots. All but blood spots increased with selection for high body weight. Shell color showed a consistent trend towards a darker color with increasing body weight. Scores for roughness of shell and, with one minor exception, the incidence of double yolks, also showed consistent trends (positive) with increasing body weight. Estimates of genetic correlations, derived directly from intra-line genetic analyses of the six pedigreed populations in the experiment, were in most cases in reasonable agreement with realized estimates.

scholarly journals Selection for Increased Egg Production Based on Annual Record in Three Strains of White Leghorns.

1987 ◽  
Vol 66 (7) ◽  
pp. 1077-1084 ◽  
Author(s):  
B. BOUKILA ◽  
M. DESMARAIS ◽  
J.P. PARE ◽  
D. BOLAMBA
Keyword(s):  
Egg Production ◽  
White Leghorns ◽  
Selection For

scholarly journals Fifteen Years of Selection for Viability in White Leghorns

1953 ◽  
Vol 32 (3) ◽  
pp. 454-461 ◽  
Author(s):  
Fred Moultrie ◽  
D.F. King ◽  
G.J. Cottier
Keyword(s):  
White Leghorns ◽  
Selection For

scholarly journals Correlated Responses to Bi-Directional Selection for Sheep Red Blood Cell Titer in White Leghorns

2012 ◽  
Vol 11 (16) ◽  
pp. 2879-2884 ◽  
Author(s):  
Qing Zhu ◽  
Yao-Dong Hu ◽  
Jie Wen ◽  
Mai-Qing Zheng ◽  
Ran-Ran Liu ◽  
...  
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Directional Selection ◽  
Correlated Responses ◽  
White Leghorns ◽  
Selection For

scholarly journals Keel bone fractures are more prevalent in White Leghorn hens than in Red Jungle fowl hens—A pilot study

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0255234
Author(s):  
Käthe Elise Kittelsen ◽  
Pall Gretarsson ◽  
Per Jensen ◽  
Jens Peter Christensen ◽  
Ingrid Toftaker ◽  
...  
Keyword(s):  
Pilot Study ◽  
Egg Production ◽  
Laying Hens ◽  
Bone Fractures ◽  
Laying Hen ◽  
White Leghorn ◽  
Red Jungle Fowl ◽  
White Leghorns ◽  
Selection For

Fractures and deviations to the keel bone are common in commercial laying hens, with reported variations in occurrence across strains and breeds. The aetiology is not fully understood, however, modern genetics and selection for efficient egg production has been claimed to be important factors for the keel bone fractures. To explore this further, we investigated keel bones from two different breeds, representing different degrees of selection for egg production: Red jungle fowl (n = 82), and White Leghorn (n = 32), where the latter is a selected laying breed which is the origin for many modern laying hen hybrids. Keel bones from a total of 116 birds, 53 hens and 63 roosters, were examined by necropsy at 80 weeks of age. All birds were raised in modified aviaries in the same holding facility. Overall, 24.5% of the hens had one or more fractures to the keel, with a difference in the prevalence between hens from the two breeds (p<0.01): 10% (95% CI: 3.7–24%) in the Red Jungle fowl hens and 69% (95% CI: 37–90%) in the White Leghorn hens. No roosters, regardless of breed, had keel bone fractures. Mild to moderate keel bone deviations were present in 54% (95% CI: 25–80%) of the hens and 4.7% (95% CI: 0.5–30%) of the roosters, all White Leghorns.

scholarly journals Effect of Long-Term Selection for Non-Destructive Deformation on Egg Shape in White Leghorns

2016 ◽  
Vol 53 (4) ◽  
pp. 249-256 ◽  
Author(s):  
Olivier Gervais ◽  
Keijiro Nirasawa ◽  
Christian E. Vincenot ◽  
Yoshitaka Nagamine ◽  
Kazuyuki Moriya
Keyword(s):  
Term Selection ◽  
Egg Shape ◽  
White Leghorns ◽  
Selection For ◽  
Non Destructive

scholarly journals Influence of Selection for Egg Production and Marek's Disease Resistance on the Incidence of Endogenous Viral Genes in White Leghorns

1989 ◽  
Vol 68 (9) ◽  
pp. 1161-1167 ◽  
Author(s):  
U. KUHNLEIN ◽  
M. SABOUR ◽  
J.S. GAVORA ◽  
R.W. FAIRFULL ◽  
D.E. BERNON
Keyword(s):  
Disease Resistance ◽  
Egg Production ◽  
Marek's Disease ◽  
Marek’S Disease ◽  
Viral Genes ◽  
White Leghorns ◽  
Selection For

scholarly journals Divergent Selection for Mature Body Weight in Dwarf White Leghorns

1983 ◽  
Vol 62 (10) ◽  
pp. 1931-1937
Author(s):  
F.H. BENOFF ◽  
J.A. RENDEN
Keyword(s):  
Body Weight ◽  
Divergent Selection ◽  
White Leghorns ◽  
Selection For
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