Abstract
Substitution of soyabean meal with “00” rapeseed meal or its high-protein fraction in the nutrition of hens laying brown-shelled eggs
Highlights
IntroductionThe use of rapeseed meal in the nutrition of broilers is more common (Smulikowska et al, 1991, 1998; Chibowska et al, 2000; Kamińska et al, 2000), than in laying hens (Rutkowski et al, 1989; Gwara et al, 1993; Brettschneider et al, 1995; Niemiec et al, 2001)
Rapeseed meal, one of the main sources of protein in animal nutrition, has a lower nutritive value than soyabean meal because of its lower protein content and higher crude fibre content, and because it contains glucosinolates, which are antinutrients.RAPESEED MEAL FOR LAYING HENSThe use of rapeseed meal in the nutrition of broilers is more common (Smulikowska et al, 1991, 1998; Chibowska et al, 2000; Kamińska et al, 2000), than in laying hens (Rutkowski et al, 1989; Gwara et al, 1993; Brettschneider et al, 1995; Niemiec et al, 2001)
These layers lack the gene that is responsible for the degradation of trimethylamine, a compound with a fishy odour, that is formed in the bacterial hydrolysis of synapine
Summary
The use of rapeseed meal in the nutrition of broilers is more common (Smulikowska et al, 1991, 1998; Chibowska et al, 2000; Kamińska et al, 2000), than in laying hens (Rutkowski et al, 1989; Gwara et al, 1993; Brettschneider et al, 1995; Niemiec et al, 2001) This may be caused by the occurrence of the unpleasant “fishy” odour of eggs from some hens fed rapeseed meal. In reviews on the occurrence of egg taint, Pearson et al (1980) and Butler et al (1982) found that it is related to the presence of sinapine in rape seed and reduced trimethylamine oxidaze activity in the liver of those hens that lay brown-shelled eggs These layers lack the gene that is responsible for the degradation of trimethylamine, a compound with a fishy odour, that is formed in the bacterial hydrolysis of synapine. This is why the use of yellow-seed varieties is rather ineffective in preventing the production of tainted eggs
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