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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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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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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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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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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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Renal haemodynamics in the laying hen
Comparative Biochemistry and Physiology Part A: Physiology, 1981Abstract 1. 1. The glomerular filtration rate (GFR) in colostomised laying hens decreased significantly during active shell formation. This reduction may play a role in the renal conservation of calcium during this period. 2. 2. Renal plasma flow (RPF) increased significantly during shell dormation.
D.N Prashad, M.E.C Robbins
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