Results 251 to 260 of about 34,287 (298)

Fluoride tolerance of laying hens

British Poultry Science, 1997
1. One thousand Silver Grey Hyline hens were given drinking water containing 5 concentrations of added sodium fluoride (0, 6, 10, 14 and 20 mg/l) over a 17-week growth and 57-week laying period. The natural fluoride content of the water was 0.21 mg/l during the growing period and 0.29 mg/l throughout lay. 2. During the rearing phase, efficiency of food
C B, Coetzee, N H, Casey, J A, Meyer
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Climatic adaptation of laying hens

Tropical Animal Health and Production, 1994
Three hundred Warren Isabrown female day old chicks were raised for 18 weeks in 3 distinct artificial climates described as temperate (20 degrees C, 60% RH), hot dry (32 degrees C, 40% RH) and hot humid (32 degrees C, 90% RH). At 18 weeks each group was divided into 3 and re-allocated to 3 similar air-conditioned laying rooms as during the growing ...
Njoya, J., Picard, M.
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Perch width preferences of laying hens

British Poultry Science, 2009
1. In order to investigate the effect of perch width on perching behaviour of laying hens, two experiments in which hens could choose between 7 different perch widths (1.5, 3.0, 4.5, 6.0, 7.5, 9.0 and 10.5 cm) were conducted. In one experiment (EXP-2P) test cages contained two long perches gradually broadening and narrowing stepwise, in the other ...
E, Struelens, F A M, Tuyttens, B, Ampe, F, Odberg, B, Sonck, L, Duchateau   +5 more
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Hyperphosphataemia in histamine injected laying hens

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1987
The effects of histamine on soluble calcium concentrations in gastrointestinal tract contents, acid secretion, urinary phosphorus excretion, plasma free-hydroxyproline and inorganic phosphorus levels were studied in laying hens during egg shell formation.
Cabrera-Saadoun, M.C., Nys, Yves, Sauveur, Bernard, Gautron, Joël   +3 more
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Panic in free‐range laying hens

Veterinary Record, 2012
PANIC 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, Brown, SN, Booth, F, Toscano, MJ, Wilkins, LJ   +4 more
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Thyroid-Ovary Relationship in Laying Hens

Zentralblatt für Veterinärmedizin Reihe A, 2010
Summary 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, 1994
Cecal 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, 1991
1. 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, 1978
Egg 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, 1978
Copper 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, D J, Brown, E, Salevsky, R M, Leach   +3 more
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