Efficacy of different levels of Escherichia coli phytase in broiler diets with a reduced P content.

Escherichia coli-derived 6-phytase expressed in Pichia pastoris (Optiphos) was added to broiler rations with considerably reduced levels of phosphorus (by 1.5 g/kg). This experiment, performed over a five-week period, involved Ross 308 male chickens kept in battery cages.

The effect of chemically and hydrothermally treated rapeseed on the performance and thyroid parameters of layers.

A feeding trial with brown laying hens was carried out in order to examine the effects of chemical and hydrothermal treatment of rapeseeds on the performance and thyroid parameters of birds during a long-term experiment. Untreated and treated rapeseeds were included in layer diets at a level of 7.5, 15.

Efficacy of different phytase preparations in broiler rations.

Three phytase preparations were added to broiler rations with considerably reduced levels of phosphorus. Birds were allocated to a positive control group (I), a negative control group (II) and three phytase-supplemented groups (III--Aspergillus niger phytase, IV--Penicillium canescens phytase, V--Pichia phytase). Major components of starter and grower diets were wheat, corn and soybean meals.

Effects of dietary fat type and non-starch-polysaccharide-hydrolysing enzyme addition to rye-based diets on muscle protein turnover in broilers.

1. Muscle protein turnover was measured in broilers fed on rye-based diets containing either beef tallow (T) or soybean oil (S) at an inclusion rate of 100 g/kg. Each of these diet types was tested either in the absence (S[-], T[-]) or presence (S[+], T[+]) of a xylanase-containing enzyme preparation.

Lysine requirement of growing male Pekin ducks.

1. One growth experiment and one balance test were conducted to study the response to increasing levels of dietary lysine supplementation in male Pekin ducks with special reference to the growth periods from 1 to 3 weeks and 4 to 7 weeks of age. 2.