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):  
1987 ◽  
Vol 66 (7) ◽  
pp. 1077-1084 ◽  
Author(s):  
B. BOUKILA ◽  
M. DESMARAIS ◽  
J.P. PARE ◽  
D. BOLAMBA

2012 ◽  
Vol 11 (16) ◽  
pp. 2879-2884 ◽  
Author(s):  
Qing Zhu ◽  
Yao-Dong Hu ◽  
Jie Wen ◽  
Mai-Qing Zheng ◽  
Ran-Ran Liu ◽  
...  

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0255234
Author(s):  
Käthe Elise Kittelsen ◽  
Pall Gretarsson ◽  
Per Jensen ◽  
Jens Peter Christensen ◽  
Ingrid Toftaker ◽  
...  

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.


2016 ◽  
Vol 53 (4) ◽  
pp. 249-256 ◽  
Author(s):  
Olivier Gervais ◽  
Keijiro Nirasawa ◽  
Christian E. Vincenot ◽  
Yoshitaka Nagamine ◽  
Kazuyuki Moriya

1989 ◽  
Vol 68 (9) ◽  
pp. 1161-1167 ◽  
Author(s):  
U. KUHNLEIN ◽  
M. SABOUR ◽  
J.S. GAVORA ◽  
R.W. FAIRFULL ◽  
D.E. BERNON

1983 ◽  
Vol 62 (10) ◽  
pp. 1931-1937
Author(s):  
F.H. BENOFF ◽  
J.A. RENDEN

1983 ◽  
Vol 62 (10) ◽  
pp. 1938-1943 ◽  
Author(s):  
F.H. BENOFF ◽  
J.A. RENDEN

1951 ◽  
Vol 30 (5) ◽  
pp. 748-757 ◽  
Author(s):  
I. Michael Lerner ◽  
Lewis W. Taylor ◽  
Dorothy C. Lowry

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