Le sorgho et le millet perlé sucrés comme substituts potentiels au maïs fourrager au Canada

Authors: Alix, Hugo
Advisor: Tremblay, GaëtanVanasse, Anne
Abstract: Sweet sorghum (Sorghum bicolor (L.) Moench) and sweet pearl millet (Pennisetum glaucum(L.) R. BR.) are two drought-resistant annual grasses that are suitable for ethanol production.However, their potential for animals feeding was only observed through the by-product of ethanol industries : the bagasse. The objective of this study was to determine if sweet sorghum and sweet pearl millet are sustainable alternatives to corn forage in terms of yield, nutritive value, and ensilability in the Canadian dairy context. Two sweet sorghum hybrids BMR, one sweet pearl millet hybrid, and one forage corn hybrid were compared for two years in five Canadian ecozones. Overall, at the recommended forage corn’s harvesting stage, sweet sorghum and sweet pearl millet had equivalent yields than forage corn in three ecozones. In the five ecozones, the average dry matter (DM) of sweet pearl millet (290 g kg-1) was higher than sweet sorghum hybrids (250g kg-1) and lower than corn (330g kg-1). The in vitrodigestibility of neutral detergent fibre (NDFd) was higher for sweet sorghum (710 g kg-1 NDF) than forage corn (590g kg-1 NDF), while total digestible nutrient (TDN) concentration was similar for sweet sorghum (530g kg-1 DM) and forage corn (550 g kg-1 DM). Across all ecozones, sweet pearl millet had lower TDN concentration and lower NDFd than forage corn. The fermentation process of forage to silage was successfully completed for all hybrids after 90 days in mini laboratory-silos. Sweet sorghum hybrids would represent viable substitutes to forage corn, as long as their DM concentration reaches at least 300 g kg-1 at harvest.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 29 May 2019
Permalink: http://hdl.handle.net/20.500.11794/35021
Grantor: Université Laval
Collection:Thèses et mémoires

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