Results 301 to 310 of about 841,035 (344)
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Panic in free‐range laying hens
Veterinary Record, 2012PANIC has been defined as ‘frantic and sudden fright’ (MacDonald 1972) and in animals is generally characterised by some form of disorientated, excessive escape behaviour, which is often inappropriate to the situation in which it occurs (Mills and Faure 1990).
Richards, GJ +4 more
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Thyroid-Ovary Relationship in Laying Hens
Zentralblatt für Veterinärmedizin Reihe A, 2010Summary A study was made of thyroid hormone activity during the ovulatory cycle of 40 HNL hens that had a regular laying pattern. The role played by the pituitary in regulating thyroid activity of the hens was also studied. Blood was collected at ovulation (egg-laying), and 5, 10, 15 and 20 hr afterwards.
F A, Soliman, S Y, Saleh, A K, Awad
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Cecal Spirochetosis in Commercial Laying Hens
Avian Diseases, 1994Cecal spirochetosis in chickens has been associated with enteric disease and reduced egg production in the United States and Europe. This report describes spirochete overgrowth of cecal mucosa in chickens from a flock of 100,000 commercial layers experiencing diarrhea and a 5% drop in egg production.
D W, Trampel, N S, Jensen, L J, Hoffman
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Optimum threonine requirement of laying hens
British Poultry Science, 19911. One experiment was conducted with medium weight laying hens to determine their threonine requirement between 28-38 weeks. 2. Two threonine-limiting diets of identical protein quality (summit-dilution) were used and, by dilution, ten protein contents were produced supplying 2.7 to 5.4 g total threonine/kg diet.
G, Huyghebaert, E A, Butler
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Pathogenesis of Fowlpox in Laying Hens
Avian Diseases, 1978Egg production dropped after hens were inoculated with fowlpox virus originally isolated from a natural mild infection. The drop started from the 2nd week and continued to the 5th week after inoculation. All birds developed focal lesions at the site of inoculation, and some developed secondary lesions.
D N, Tripathy, L E, Hanson
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Copper Deficiency in the Laying Hen
The Journal of Nutrition, 1978Copper deficiency in the laying hen resulted in anemia and the production of eggs which were abnormal in size and shape. Many of the eggs had shells which were wrinkled and rough in texture. There was also an increase in the number of shell-less eggs.
S, Baumgartner +3 more
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Calcium Logistics in the Laying Hen
The Journal of Nutrition, 1987The hourly changes in the Ca2+ content of various physiological compartments in relation to shell formation has been calculated for the domestic hen throughout a 4-d ovulatory sequence. These calculations consider the circadian rhythm in Ca2+ intake when the hen is fed a complete feed or a diet containing oyster shell, the effect of the stage of the ...
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The laying hen and bone fractures
Veterinary Record, 2011THE laying hen has undergone considerable artificial selection pressure over the past century, to increase its egg output in order to provide a protein-rich food source for humans. While its wild counterpart will lay just five to six eggs per breeding season, modern breeds will lay in excess of 300 eggs per year (Lever 2011). With increased egg output,
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