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Conservation breed/line laying hens: Greenleg Partridge (Z-11), Yellowleg Partridge (Ż-33), Rhode Island Red (R-11), Sussex (S-66) and Leghorn (H-22 and G-99), 360 per strain were divided into 2 equal feeding treatment groups. Control groups (C) were fed a standard complete diet, experimental groups (L) were fed a diet with 10% linseed. The experiment was conducted from 37 to 52 weeks of age. Hatching...
Isa Brown hens were divided into five groups, each with 12 replications, i.e. cages with 3 birds each. The isoprotein and isoenergetic diets (about 160 g crude protein and 11.3 MJ ME/kg) differed in their contents of spray-dried porcine blood plasma (SDBP) or spray-dried blood cells (SDBC), which amounted to 2 or 4%. Control birds were fed a diet containing plant proteins only. Laying performance...
The aim of this experiment was to determine the efficacy of different inclusion levels of new type phytase (ECP) synthesized by Escherichia coli and expressed in Pichia pastoris yeast (Optiphos) in maize-soyabean meal based diets on egg quality and the laying performance of laying hens aged from 20 to 44 weeks. Two hundred and twenty Lohmann Brown hens were randomly assigned to five treatments with...
The intestinal and total tract digestibilities of phosphorus (P) and phytate P were determined in digestibility trials with laying hens and broiler breeders fed a diet containing P, phytate P and Ca at 6.37, 2.00 and 34.1 g·kg-1, respectively. In both digestibility trials, the total tract digestibility of phytate P was higher than the intestinal digestibility (33 and 35% vs 20 and 18%). In contrast,...
The study aimed at finding out how to replace the unstable iodine additives by the stable ones in feeding of laying hens. The control hens received potassium iodide (1 mg of iodine/kg of feed), the feed of trial groups was supplemented with dry stable concentrated iodine "Jodis" (1 mg and 4 mg of iodine/kg of feed). In the control group the amount of iodine in eggs was 5.8 µg/100 g, in the...
The influence of dietary palm olein, in comparison to fish oil and lard, on lipid levels in egg yolk and blood plasma, the fatty acid composition of egg yolk, and various production parameters were studied. Brown Lohman laying hens (n=45) were randomly assigned into three groups of 15 birds, and treated with experimental diets with either 3% palm olein (PO), fish oil (FO) or lard (L) for 6 weeks....
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