Rapeseed meal‐glucosinolates and their antinutritional effects. Part II. Flavour and palatability

Abstract

SummaryThis paper has reviewed the current literature relating to the effects of glucosinolates on the palatability of rapeseed meal. The available evidence indicates that diet palatability can be adversely affected by rapeseed meal inclusion and that this response is related to glucosinolate level. However the response is variable and depends also on the species of animal, age and growth state. Younger animals, particularly chicks, piglets and calves appear to be more severely affected and exhibit reduced intake and hence depressed performance with diets containing high levels of glucosinolates from high glucosinolate rapeseed meal. Palatability is substantially improved by the use of low glucosinolate rapeseed meal (LG-RSM) containing 10-30 kg/g and very low glucosinolate rapeseed meal (VLG-RSM) containing 1 -5 pg/g glucosinolates. From the findings of this review, it can be concluded that LG-RSM and VLG-RSM can be included at levels up to 20% and 30% for calves and dairy cows respectively. Since piglets are particularly sensitive it is suggested that rapeseed is excluded from early starter diets but that low glucosinolate meals can be included at levels of 10% and 15% for grower and finisher pigs respectively. Growing poultry may be less sensitivc to palatability problems associated with rapeseed meal but the use of high levels is constrained due to the lower energy and higher fibre contents of RSM compared with soybean meal. ZusammenfassungRapssamenmehl-Glucosinolate und ihre antinutritiven Effekte. 2. Mitt. Aroma und Schmackhaftigkeit Es wird die gegenwartige Literatur uber den EinfluD von Glucosinolaten auf die Schmackhaftigkeit von Rapssamenmehl zusammengefaBt. Die verfugbaren Nachweise zeigen, dal3 die Schmackhaftigkeit einer Diat durch Rapssamenmehl-Zusatz nachteilig beeinfluBt werden kann und rnit dem Glucosinolatgehalt im Zusammenhang steht. Die Reaktion ist jedoch variabel und hangt auch von der Tierart, dem Alter und dem Wachstumszustand ab. Jungere Tiere, insbesondere Kuken, Ferkel und Kalber, werden offensichtlich starker betroffen; sie zeigen eine reduzierte Futteraufnahme und damit eine gestorte Entwicklung bei Diaten, die Rapssamenmehl rnit hohem Glucosinolatgehalt enthalten. Die Schmackhaftigkeit wird deutlich verbessert bei Verwendung von Rapssamenmehl mit niedrigem Glucosinolatgehalt (LG-RSM ; 10 -30 pg Glucosinolat/g) und solche rnit sehr niedrigem Glucosinolatgehalt (VLG-RSM; 1 -5 pg Glucosinolat/g). Aus den Ergcbnissen dieser ubersicht kann geschlossen werden, daD LG-RSM und VLG-RSM bis zu 20% bei KPlbern und bis zu 30% bei Miichkuhen im Futter enthalten sein konnen. Da Ferkel besonders empfindlich sind, wird vorgeschlagen, daD Rapssamenmehl bei Starterdiaten ausgeschlossen wird, dal3 aber LG-RSM bis zu 10% fur groDere und bis zu 15% fur erwachsene Schweine eingesetzt werden kann. Heranwachsendes Geflugel ist wahrschcinlich gegenu ber Geschmacksproblemen in Verbindung rnit Rapssamenmehl weniger empfindlich. Die Verwendung groI3erer Anteile ist aber begrenzt wegen des verringerten Energie-u...

The use of treated rape cake in a calf starter diet

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Effects of pork differentiation strategies in Canada on pig performance and carcass characteristics

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