Heat—Moisture Treatment of Rapeseed Meal: Effect on Digestibility of the Diet, Voluntary Grass Silage Intake and Growth Rate of Ayrshire Bulls
Titel:
Heat—Moisture Treatment of Rapeseed Meal: Effect on Digestibility of the Diet, Voluntary Grass Silage Intake and Growth Rate of Ayrshire Bulls
Auteur:
Aronen, Ilmo Vanhatalo, Aila
Verschenen in:
Acta agriculturae Scandinavica. Section A, Animal science
Paginering:
Jaargang 42 (1992) nr. 3 pagina's 157-166
Jaar:
1992-08-01
Inhoud:
Forty-eight Finnish Ayrshire bulls of average live weight 106 kg at the start and 432 kg at the end of the experiment were fed grass silage ad libitum and restricted amounts of concentrates consisting of barley alone (treatment A), or barley supplemented with untreated 0-rapeseed meal (RSM-1, B), heat-moisture-treated (OPEX®) 00-RSM (RSM-2, C), untreated 00-RSM (RSM-3, D) or heat-moisture treated 00-RSM (RSM-4, E). RSM-1 and RSM-2 originated from black-seeded rapeseed varieties (Brassica campestris) and RSM-3 and RSM-4 from a variety with yellowish-coloured seeds. Heat-moisture treatment of RSM effectively reduced the content of glucosinolates and was favourable for voluntary grass silage intake. The improved animal performance could not be explained solely by the reduced rumen degradability and thereby increased supply of rumen-undegraded feed protein to the intestine. Rather, the enhanced liveweight gain of bulls on 00-RSM supplements was closely related to increased grass silage intake and thereby to increased energy intake. Differences in fatty acid composition in subcutaneous and m. longissimus dorsi fat were observed between the various RSM feeding groups.
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