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The effect of nitrate content in forage on quality of silage fermentation

Knicky, Martin and Spörndly, Rolf and Eide, Fredrik and Gertzell, Bengt (2017). The effect of nitrate content in forage on quality of silage fermentation. I/In: 8th Nordic Feed Science Conference, 170613-170614, Uppsala, Sweden.
[Conference Paper]

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Abstract

Nitrate content in fresh herbage is one of the factors affecting fermentation in silage. Hein (1970) observed that ensiling of forages with low nitrate content often results in silages with high butyric acid contents. Butyric acid is an undesirable product of clostridia in silages indicating low silage nutritional quality (Pahlow et al., 2003). The effect of nitrate on butyric acid formation is derived from its degradation products. Nitrate undergoes reduction to nitrite which can be further converted to nitric oxide which is considered to be toxic for clostridia (Spoelstra, 1983). Therefore, crops high in nitrate decreases clostridial activity and, hence, butyric acid formation. The effect of nitrate content in fresh crops on butyric acid formation was summarized by Weissbach (1996). The summary shows high occurrence (78%) of butyric acid in silages made from crops low (<105) in epiphytic lactic acid bacteria (LAB) while containing <0.5 g NO3 per kg dry matter (DM). In contrast, incidence of butyric acid in silages from crops with similarly low LAB count but containing >1 g NO3 per kg DM was only 26%. Since it is common to use silage additives to improve or secure a proper ensiling process, it is interesting to study how different nitrate contents in fresh crops influence efficiency of silage additives. The objective of the study was, therefore, to study the effect of nitrite containing silage additives on silage quality with crops differing in nitrate content.

Authors/Creators:Knicky, Martin and Spörndly, Rolf and Eide, Fredrik and Gertzell, Bengt
Title:The effect of nitrate content in forage on quality of silage fermentation
Series/Journal:Rapport / Sveriges lantbruksuniversitet, Institutionen för husdjurens utfodring och vård (0347-9838)
Year of publishing :2017
Number:296
Page range:60-64
Number of Pages:5
Place of Publication:Uppsala
Publisher:Institutionen för husdjurens utfodring och vård, SLU
ISSN:0347-9838
Language:English
Publication Type:Conference Paper (Other)
Refereed:No
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Keywords:silage fermentation, nitrate content, quality
URN:NBN:urn:nbn:se:slu:epsilon-e-5052
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-5052
ID Code:15246
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: SLUpub Connector
Deposited On:12 Oct 2018 07:46
Metadata Last Modified:12 Oct 2018 07:46

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