ORIGINAL PAPER
Laying performance and nitrogen balance in hens fed organic diets with different energy and methionine levels
 
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National Research Institute of Animal Production, Department of Animal Nutrition and Feed Science, 32-083 Balice, Poland
CORRESPONDING AUTHOR
J. Koreleski   

National Research Institute of Animal Production, Department of Animal Nutrition and Feed Science, 32-083 Balice, Poland
Publication date: 2009-03-20
 
J. Anim. Feed Sci. 2009;18(2):305–312
 
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ABSTRACT
In a model experiment, 72 Bovans brown hens from 24 to 53 weeks of age were allocated to 4 groups with 18 replicates. Each hen (replicate) was kept in an individual cage. Layers were fed basal organic diets with lower or higher metabolizable energy (MEN) contents resulting from including 1% rape seed oil. The diets formulated according to organic limitations on feedstuff choices were either not supplemented or supplemented with 0.6 g·kg-1 DL-methionine (Met) to increase total dietary methionine and SAA levels to 2.94 g and 5.21 g·kg-1, respectively. In the experiment, egg production, feed intake, feed conversion, egg quality parameters and nitrogen (N) balance indices were determined. Met supplementation of the diet had a positive effect on laying rate, feed intake and feed conversion (P<0.001). Egg and yolk weight were also increased by Met, but yolk contribution in egg was not changed. The higher energy level decreased daily feed intake, but had no effect on other performance parameters. The increased dietary energy level positively affected N retention measured as % of N intake (P<0.05). Adding Met increased daily N retention (P<0.05) and N retention as % of N intake (P<0.01) and decreased N content in excreta (P<0.05), but the differences in daily N excretion were not confirmed statistically. Nevertheless, it could be calculated for the whole experimental period (350 days) that feeding the higher energy- and methionine-supplemented diet decreased N excretion in manure by 56 and 63 g N per hen.
 
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ISSN:1230-1388