Effect of dietary phosphorus level and supplemental phytase on performance of Hisex Brown laying hens and egg shell quality
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Research Institute of Animal Production, Department of Feed Science and Animal Products, 32-083 Balice, Poland
Research Institute of Animal Production, Department of Animal Nutrition, 32-083 Balice, Poland
Publication date: 1996-07-09
J. Anim. Feed Sci. 1996;5(3):249–259
The experiment was carried out on Hisex Brown hens aged 26-48 weeks divided into 12 groups of 18 birds kept in single cages. Layers were fed wheat-maize-soyabean meal diets containing 0.50, 0.55 and 0.60% total phosphorus (TP), 0.25, 0.30 and 0.35% available phosphorus (AP) supplemented with 0, 150, 300 or 450 units of microbial phytase (FTU) per kg. Hens were fed diet containing 0.50% TP supplemented with 300 FTU showed the highest laying rate (93%) and good egg shell quality. However, the thickest egg shells and the highest breaking strenght were found when diets containing 0.30-0.35% AP were supplemented with 150 FTU. Hens fed diet with 0.25% AP + 300 FTU excreted 100 mg/day/hen less P than those fed diet with 0.35% AP (0.60% TP), not supplemented with phytase. As the optimal levels in the diet are considered 0.25% AP + 300 FTU or 0.30% AP + 150 FTU.
Availability of phytate phosphorus and endogenous phytase activity in the digestive tract of laying hens 20 and 47 weeks old
M. Marounek, M. Skřivan, G. Dlouhá, N. Břeňová
Animal Feed Science and Technology