scholarly journals Effects of the Northern Fowl Mite, Ornithonyssus sylviarum (Canestrini and Fanzago), on Egg Quality of White Leghorn Hens

1981 ◽  
Vol 60 (10) ◽  
pp. 2200-2202 ◽  
Author(s):  
JOYCE A. DEVANEY
Keyword(s):  
Egg Quality ◽  
White Leghorn ◽  
Ornithonyssus Sylviarum ◽  
Northern Fowl Mite

scholarly journals Egg Quality. 2. Albumen Quality of Eggs from Five Commercial Strains of White Leghorn Hens During One Year of Lay

1986 ◽  
Vol 65 (1) ◽  
pp. 63-66 ◽  
Author(s):  
G. DOYON ◽  
M. BERNIER-CARDOU ◽  
R.M.G. HAMILTON ◽  
F. CASTAIGNE ◽  
C.J. RANDALL
Keyword(s):  
Egg Quality ◽  
White Leghorn ◽  
One Year

scholarly journals Seasonal Changes in Interior Egg Quality of Single Comb White Leghorn Hens

1936 ◽  
Vol 15 (2) ◽  
pp. 115-118 ◽  
Author(s):  
J.A. Hunter ◽  
A. Van Wagenen ◽  
G.O. Hall
Keyword(s):  
Seasonal Changes ◽  
Egg Quality ◽  
White Leghorn ◽  
Single Comb

Beak condition drives abundance and grooming-mediated competitive asymmetry in a poultry ectoparasite community

Parasitology ◽  
2011 ◽  
Vol 138 (6) ◽  
pp. 748-757 ◽  
Author(s):  
BRIAN L. CHEN ◽  
KATHRYN L. HAITH ◽  
BRADLEY A. MULLENS
Keyword(s):  
White Leghorn ◽  
Lower Abdomen ◽  
Pesticide Application ◽  
Worker Exposure ◽  
Ornithonyssus Sylviarum ◽  
Northern Fowl Mite ◽  
Enemy Free Space ◽  
Reciprocal Transfer ◽  
Beak Trimming ◽  
Over Time

SUMMARYObjective.Ornithonyssus sylviarum(northern fowl mite) andMenacanthus stramineus(chicken body louse) are key poultry pests currently controlled by exclusion or pesticide application. We studied how host beak condition affected their populations over time and how the lice and mites might interact on a host.Methods. Beak-trimmed or beak-intact white leghorn hens were infested initially with either mites or lice and subsequently challenged using the alternate ectoparasite species (reciprocal transfer), while other hens harboured only the initial ectoparasite species.Results. Beak-trimmed hens had far higher ectoparasite numbers relative to beak-intact hens, and the 2 ectoparasites showed evidence of grooming-mediated competitive asymmetry. On beak-trimmed hens, larger numbers of lice quickly nearly completely excluded mites in competition for enemy-free space (lower abdomen), while in the reciprocal transfer mites did not affect louse numbers on beak-trimmed hosts. The 2 ectoparasites co-existed on beak-intact hens, which were better able to defend the lower abdomen habitat by grooming.Conclusion. Lice are somewhat less damaging and much easier to control relative to mites, and might be used to eliminate mites in commercial, beak-trimmed flocks. Beak trimming impairs host grooming and contributes greatly to the high ectoparasite populations seen in commercial flocks. The study adds incentives for poultry breeders to develop more docile hen strains that can be held without beak trimming. This has advantages both to welfare advocates and producers who may no longer need to use insecticides for pest control or be concerned about worker exposure to pesticides.

THE EFFECT OF PHASE-FEEDING ON EGG PRODUCTION AND EGG QUALITY OF WINTER-HOUSED WHITE LEGHORN HENS

1982 ◽  
Vol 62 (3) ◽  
pp. 887-897 ◽  
Author(s):  
N. A. CAVE ◽  
R. M. G. HAMILTON
Keyword(s):  
Body Weight ◽  
Protein Content ◽  
Egg Production ◽  
Egg Quality ◽  
Performance Criteria ◽  
Feed Consumption ◽  
White Leghorn ◽  
Egg Weight ◽  
Variable Effect

Two experiments with nine strains of Single Comb White Leghorn hens were conducted to compare laying house performance of hens given a diet of uniform protein content or a phase-feeding diet in which protein content was reduced from 156 to 148 and then to 140 g/kg at 273 and 414, or 273 and 384 days of age. Performance criteria were egg production, feed and protein intake, egg, quality, egg weight, mortality and body weight. Phase-feeding allowed reductions of 4.2 and 4.3% in protein consumption without reducing egg production, mortality or, except in one strain, body weight. There was an increase of 0.5% in feed consumption, but feed cost was reduced by 1.3%. Phase-feeding increased Haugh units by 0.3% and decreased specific gravity of eggs in one experiment, decreased percent visibly-cracked eggs in the other experiment and had no effect on percent blood spots. Depending on strain, phase-feeding had a variable effect on egg weight in exp. 1 but had no effect in the second experiment. Key words: Phase-feeding, protein utilization, egg production, hen

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