scholarly journals Genomics of heterosis and egg production in White Leghorns

2020 ◽  
Author(s):  
Esinam Nancy Amuzu‐Aweh
Keyword(s):  
Egg Production ◽  
White Leghorns

Extension

1930 ◽  
Vol 3 (4) ◽  
pp. 71-77
Keyword(s):  
Egg Production ◽  
Annual Report ◽  
Agricultural Experiment Station ◽  
Texas Agricultural Experiment Station ◽  
Breeding Work ◽  
Experiment Station ◽  
White Leghorns ◽  
Agricultural Experiment

Texas Agricultural Experiment Station. Fourty-First Annual Report, 1928, Brazos County, Texas.Breeding as Affecting Egg Production.The work under this project this year is a continuation of that carried on the previous year. The progeny of Cocks 113, 114, 115, and 116, were trapnested during the year. Cock No. 116 is the outstanding breeder, none of his pullets laying less than 100 eggs up to October 1, and 58 per cent of them laying over 180 eggs. Pullets hatched in the spring of 1927, are being trap-nested this year, but their records are not complete. Other pullets which were hatched in the spring of 1928 are being held and will be trap-nested the coming year. In addition to breeding White Leghorns for increased egg production, breeding work is being done using White Rocks and Barred Rocks in an endeavor to establish a White Rock high-egg producing strain.

LAYER PERFORMANCE IN COLONY CAGES AS RELATED TO STOCKING DENSITY AND POPULATION SIZE

1977 ◽  
Vol 57 (4) ◽  
pp. 785-792 ◽  
Author(s):  
A. T. HILL
Keyword(s):  
Population Density ◽  
Population Size ◽  
Feed Efficiency ◽  
Egg Production ◽  
Egg Quality ◽  
Stocking Density ◽  
White Leghorns ◽  
High Level

Two commercial strains of White Leghorns were each measured for egg production, egg quality, feed efficiency and net egg income over feed and bird costs. The birds were in populations of 18, 24 and 30 per colony cage each at densities of 310, 387 and 464 cm2 per bird. In addition, a 10th population–density combination of 24 birds, caged singly at 619 cm2, served as controls. A total of 3,840 birds were measured for 60 wk in two tests, each with four replications. Results were also related directly to an earlier experiment with populations of 3, 6 and 12 birds per cage at the same densities. The performances of populations of 18, 24 and 30 birds were equal and poor relative to the controls. All three populations at 387 cm2 per bird were superior to those at 310 cm2 and equal to 464 cm2 in egg production and net egg income. In comparisons with more conventionally caged populations of 3, 6 and 12 birds, colony caged layers yielded significantly (P < 0.01) fewer eggs and less net egg income. Mortality was significantly (P < 0.05) greater for colony caged layers. It was concluded that the general high level of stress in colony cages prevented the expression of declining performance normally expected with population increases, yet effects due to density were still evident.

Long-term selection using a single trait criterion, non-destructive deformation, in White Leghorns: Effect over time on genetic parameters for traits related to egg production

2016 ◽  
Vol 88 (2) ◽  
pp. 222-230
Author(s):  
Olivier Gervais ◽  
Keijiro Nirasawa ◽  
Christian E. Vincenot ◽  
Yoshitaka Nagamine ◽  
Kazuyuki Moriya
Keyword(s):  
Egg Production ◽  
Genetic Parameters ◽  
Term Selection ◽  
White Leghorns ◽  
Non Destructive ◽  
Over Time

Effects of graded levels of toxaphene on poultry residue accumulation, egg production, shell quality, and hatchability in white leghorns

1977 ◽  
Vol 25 (4) ◽  
pp. 928-932 ◽  
Author(s):  
Parshall B. Bush ◽  
John T. Kiker ◽  
Robert K. Page ◽  
Nicholas H. Booth ◽  
O. J. Fletcher
Keyword(s):  
Egg Production ◽  
Shell Quality ◽  
White Leghorns

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 RESPONSE OF WHITE LEGHORNS TO DIETS CONTAINING GROUND OR WHOLE TRITICALE

1987 ◽  
Vol 67 (2) ◽  
pp. 583-585 ◽  
Author(s):  
S. LEESON ◽  
J. D. SUMMERS
Keyword(s):  
Body Weight ◽  
Key Words ◽  
Feed Intake ◽  
Egg Production ◽  
Laying Hens ◽  
Energy Value ◽  
White Leghorns

Growing leghorn pullets and laying hens were fed diets containing triticale as the sole cereal source. Body weight of pullets was not affected (P > 0.05) by up to 70% dietary inclusion of triticale. When layer diets contained 70% whole or ground triticale in place of corn, egg production was depressed (P < 0.05) while birds consumed more feed (P < 0.05). The feed intake effect is discussed in relation to the energy value of triticale. Key words: Triticale, pullets

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