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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.
O J Fletcher +2 more
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The effects of lindane on laying hens
British Poultry Science, 1972Synopsis Feeding lindane, in capsule form, to laying hens at a rate equivalent to 100 mg/kg food for 1 or 2 weeks had little effect on egg production. Longer periods of feeding resulted in a 20 to 30% decrease in the rate of egg production. When treatment was stopped after 4 weeks, the birds recovered and egg production returned to its original rate ...
C. C. Whitehead +2 more
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Antifertilityeffects of clonidine in laying hens [PDF]
Experientia, 1981 Clonidine was anovulatory and markedly antigonadal in laying hens when infused for 1 week from minipump implants at daily rates of 1.08 mg per hen or greater. The ovaries of hens treated with clonidine responded to FSH injections which suggests that the antigonadal effect of clonidine resulted from a reduction in the output of gonadotropin by the ...
R. L. Tolman +4 more
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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
N. H. Casey, J. A. Meyer, C. B. Coetzee
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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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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.
Roland M. Leach +3 more
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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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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.
L. E. Hanson, D. N. Tripathy
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OSTEOPOROSIS IN THE LAYING HEN1
Endocrinology, 1960Osteoporosis develops in White Leghorn chickens during the first year of egg production and becomes severe during the molt. Immature, and young mature pellets, cockerels, and nonmolting roosters do not have osteoporosis. The disorder appears to be a derangement of the normal process of haversian remodelling: the compact bone is resorbed without ...
Nancy Marie Deutsch, Marshall R. Urist
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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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