ORIGINAL PAPER
Composition and nutritional value for chickens and
rats of seeds, cake and solvent meal from
low-glucosinolate yellow-seeded spring rape and
dark-seeded winter rape
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The Kielanowski Institute of Animal Physiology and Nutrition,
Polish Academy of Sciences,
05-110 Jabłonna, Poland
Publication date: 1998-10-22
J. Anim. Feed Sci. 1998;7(4):415-428
KEYWORDS
ABSTRACT
The chemical composition and nutritional value of seeds, press-cakes and solvent meals produced under the same processing conditions from yellow-seeded spring Brassica rapa (YSR), and
dark-seeded winter Brassica napus (DSR) rape were determined. Both varieties were of double low
type. YSR products contained more protein and less fibre than DSR products, YSR meal contained
less glucosinolates and had a similar concentration of amino acids (g/16 gN) as DSR meal.
The nutritional value of DSR and YSR seeds and products was evaluated in two experiments on
261 broiler cockerels; press-cakes and solvent meals also in 4 experiments on 212 male rats. In
chickens, the energy value of all YSR products was considerably higher than DSR due to greater fat
digestibility. In rats, the nutritional value of protein (TD, BV, NPU) and energy value of YSR cake
and meal were similar or marginally greater than of the respective DSR products.
Growth performance of chickens fed isoenergetic diets containing 20% of YSR and DSR meal
did not differ from controls. In rats, feed intake and growth rate were negatively correlated with the
glucosinolate level in the evaluated products and better on YSR than DSR cake and meal.
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