Substitution of soyabean meal with "00" rapeseed meal or its high-protein fraction in the nutrition of hens laying brown-shelled eggs
2003
Kaminska, B.Z. (Research Institute of Animal Production, Balice (Poland). Dept. of Feed Sciences)
One hundred and seventy-five laying hens each of lines Hy-Line and ISA Brown were divided into seven groups of 25 birds and maintained in individual cages from the age of 26 weeks for 9 months of laying. The hens were fed isoprotein and isocaloric diets containing 16.7 percent crude protein and 11.4 MJ/kg. In the experimental diets, 45, 60 or 100 percent of the protein of soyabean meal was replaced by protein from regular rapeseed meal (R-RSM) or fractionated rapeseed meal (S-RSM) containing 11 percent more protein and 14 percent less crude fibre. Every 8 weeks egg and egg shell quality were assessed on 15 eggs per grouptwice during the experiment egg odour was assessed on eggs from all of the hens. The use of rapeseed meal, both R-RSM and S-RSM, had no effect on laying rate parameters of egg and egg shell quality. As the content of rapeseed meal in the diet increased, the weight of eggs decreased (P0.01). Among the hens fed the ration containing rapeseed meal, 3.4 percent of the Hy-Line and 7.4 percent of the ISA Brown hens laid eggs with a fishy odour. The type of rapeseed meal and its content in the diets had no effect on the occurrence or intensity of the non-specific odour of eggs
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