Effects of ensiling maize and sample conditioning on in situ rumen degradation of dry matter, starch and fibre

•Ensiling and sample conditioning have an effect on in situ degradation of maize.•Ensiling maize increased in situ degradability of dry matter and starch.•Ensiling maize decreased in situ degradability of cell walls (aNDF).•Grinding dried samples at 4mm limits starch losses during in situ degradatio...

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Published in:Animal feed science and technology 2014-10, Vol.196, p.12-21
Main Authors: Peyrat, J., Nozière, P., Le Morvan, A., Férard, A., Protin, P.V., Baumont, R.
Format: Article
Language:English
Subjects:
Agricultural sciences
Food and Nutrition
Forage conservation
In situ
Life Sciences
Maize silage
Ruminal degradation
Sample conditioning
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Summary:•Ensiling and sample conditioning have an effect on in situ degradation of maize.•Ensiling maize increased in situ degradability of dry matter and starch.•Ensiling maize decreased in situ degradability of cell walls (aNDF).•Grinding dried samples at 4mm limits starch losses during in situ degradation. High-production ruminants are commonly fed maize silage, which makes accurate evaluation of its nutritive value a key economic issue. However, evaluations of the rate and extent of ruminal degradation of starch and cell wall fractions from maize silage carry uncertainty due to the lack of a standardized method. Here, we investigated the effects of ensiling and sample conditioning on in situ-measured degradation of maize forage. Eight series of maize samples (two hybrids×two maturity stages×two methods of conservation [non-ensiled or fresh and ensiled]) were nylon-bagged in three conditionings: dried and ground to 1mm (D1), dried and ground to 4mm (D4), frozen and coarse-ground (FG). Disappearance of dry matter (DM), starch and fibre (aNDF) was measured in situ in cow rumen after different incubation times (2, 4, 8, 16, 24, 48 and 96h). Effects of ensiling, sample conditioning, genotype, maturity and their interactions on DM, starch and aNDF degradation were analyzed using the SAS MIXED procedure. Effective dry matter degradability (ED4DM) was significantly higher (P
ISSN:0377-8401
1873-2216
DOI:10.1016/j.anifeedsci.2014.06.017