Laying hens
Developmental changes of lymphoid tissue in Harderian gland of the laying hens
... However, the main morphological characteristic that distinguishes it from others secondary immune organs is the presence of a large number of plasma cells in hens of 4 months of ages and all older birds. This ...
6
Exogenous estradiol improves shell strength in laying hens at the end of the laying period
... Background: Cracked shells, due to age related reduction of shell quality, are a costly problem for the industry. Parallel to reduced shell quality the skeleton becomes brittle resulting in bone fractures. Calcium, a ...
11
The Emission Factors Determination at Different Breeding Technology of Laying Hens
... According to obtained results the study shows, that the reduction of ammonia and greenhouse gas emissions can be achieved not with using any pollutants reduction substances, but only with changing technology of air ...
5
The potential of blue lupins as a protein source, in the diets of laying hens
... of laying hens at a rate of 150 g/kg DM resulted in no adverse e ff ects in production or hen health and could be used as part of a balanced ration with inclusion of NSP degrading enzymes to reduce reliance ...
8
Ethological investigation on moulting laying hens in organic farming
... laying hens. However, from an ethi- cal point of view a longer life for laying hens is desired, not only because the hens can be used for a longer period but also less male chicks would ...
6
Plasma corticosterone concentration in laying hens (Gallus Domesticus) during the laying period
... of laying hens (gallus domesticus) during the laying ...Brown laying hens, which were caged in enriched cage system according to EU directive ...
6
Comparison of two different breeding systems laying hens in relation to egg damage and dirty, I
... the laying hens of the final hybrid ISA Brown reared in enriched cage system, and the free range ...for laying hens in accordance with legislation establishing minimum standards for the ...
6
The effect of essential oils on performance of laying hens
... for laying hens with different doses of thyme or oregano essential oil addition on body weight, feed consumption and egg production were ...studied. Hens of laying hybrid Hy-Line Brown (n=50) ...
7
Air quality measurements in laying hens housing
... systems, laying hens should be kept in good environmental conditions, ensuring good care, in order to ensure that laying hens are performing to their maximum yield capacities within their ...
5
Negative Effect of Phytase Superdosing in Laying Hens
... In laying hens, the problem is complicated due to the high Ca requirement for egg shell formation and the negative effects of metabolic relationships of Ca : ...
6
Health and Welfare in Dutch Organic Laying Hens
... slaughterhouse hens reported pododermatitis, keel bone deformations, endoparasites, and fatty ...12–1,700 hens found a 9% (1–60) mean mortality, cannibalism, endoparasites, red mites, and leg parasites as ...
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In vivo model experiment using laying hens treated with Enterococcus faecium EM41 from ostrich faeces and its enterocin EM41
... Enterococcus faecium EM41 is an isolate from ostrich faeces. It produces a thermo-stable proteinaceous substance, bacteriocin (enterocin) EM41 with the highest inhibition activity in late logarithmic phase of growth (25 ...
10
Laying performance and eggshell quality in laying hens fed diets supplemented with prebiotics and organic acids
... breeder hens have demonstrated that organic acids can have a positive effect on laying performance and eggshell quality (Park et ...older laying hens (from 75 to 80 weeks of age) organic acids ...
13
Effect of housing system on the calcium requirement of laying hens and on eggshell quality
... commercial laying hens not only because of eggshell quality but also because of bone ...in laying hens and there is strong evidence that genetic variation exists for osteoporosis (Bishop et ...
7
Effects of perch on feed consumption and behaviour of caged laying hens
... Conflicting results have been published on the effects of furnishing cages on feed consumption. Lower feed intake has been reported in cages with perches (Tauson and Jansson 1988, Braastad 1990, Glatz and Barnett 1996). ...
11
VARIANCE COMPONENTS AND SELECTION FOR FEATHER PECKING BEHAVIOR IN LAYING HENS
... in laying hens based on the longest selection history and largest data set available to date were pre- ...adult hens during a settling period of 7 to 12 d was ...
8
Performance and Serum Hepatic Enzymes of Hy-Line W-36 Laying Hens Intoxicated with Dietary Carbon Tetrachloride
... production was decreased and feed intake and cracked eggs were increased. It has been shown that the toxins destruct the epithelial cells of the intestinal wall and change the intestinal ecosystem leading to the ...
6
THE INFLUENCE OF “AVISTIM” PREMIX ADMINISTERED IN LAYING HENS DIET ON THE PRODUCTION PERFORMANCES AND EGG QUALITY
... in laying hens diet determines a greater pigmentation of yolk without negative effects on the eggs production and egg ...in laying hens ...
7
Evaluation of nesting behavior of individual laying hens in an enriched colony housing by using RFID technology
... track laying hen behaviors automatically [26] , investigate laying hens’ behavior in a preference chamber [27] , and evaluate the impacts of outdoor stocking density on the welfare and behavior of ...
9
Participatory breeding system for laying hens
... provide laying hens since internationally production systems are rather uniform, however there are differences between these companies concerning traits and breeding methods ...commercial laying ...
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