Results 341 to 350 of about 818,236 (379)
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The influence of light of different wavelengths on laying hen production and egg quality
, 2020SUMMARY Worldwide, commercial laying hens are frequently being used for only one production cycle mainly due to a decline in egg quality and/or egg quantity at 70–80 weeks of age.
A. England, I. Ruhnke
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Suspected Mycotoxicosis in Laying Hens
Avian Diseases, 1985A flock of 15,000 leghorn-type hens experienced a 10% drop in egg production. Enlarged, blue combs and diarrhea were also present. Clinical signs, postmortem and histopathological lesions, and response to therapy were compatible with a diagnosis of mycotoxin intoxication.
C L, Hofacre, R K, Page, O J, Fletcher
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Causes of feather pecking and subsequent welfare issues for the laying hen: a review
, 2020When feather-pecking behaviour by hens becomes repetitive, plumage damage often results for the recipient of the pecks. The forceful removal of feathers and vigorous pecks directed at the skin may also cause pain, fear and even wounds.
G. Cronin, P. Glatz
semanticscholar +1 more source
Natural behaviours, their drivers and their implications for laying hen welfare
, 2020Some believe that farm animals need to be kept in conditions that provide ‘natural’ aspects in the animal’s environment and, thus, provide the opportunity for the animals to perform their full ‘behavioural repertoire’.
P. Hemsworth, L. Edwards
semanticscholar +1 more source
Fluoride tolerance of laying hens
British Poultry Science, 19971. 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, 1994Three 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, 20091. 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 +5 more
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Hyperphosphataemia in histamine injected laying hens
Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1987The 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. +3 more
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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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