Effect of maturity at harvest on in vitro methane production from ensiled grass

Authors: Holtshausen, L.1; Liestøl, S. H.-O.2; Nes, S. K.2; Beauchemin, K. A.1; Harstad, O. M.2; McAllister, T. A.1

Source: Acta Agriculturae Scandinavica, A, Volume 62, Number 1, 1 March 2012 , pp. 40-45(6)

Publisher: Taylor and Francis Ltd

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Controlling the time of harvest to affect grass maturity for silage was evaluated as a methane (CH4) mitigation strategy in a batch culture in vitro with ruminal fluid as inoculum and silage from a mixed timothy (Phleum pretense)-meadow fescue (Festuca pratensis) stand. The stand was cut in May (early maturity [EM]; first cutting), June (late maturity [LM]; first cutting), and August (mid-maturity [MM]; third cutting). Disappearance of neutral detergent fiber (NDF) (EM: 0.58; MM: 0.50; LM: 0.45) and ADF (EM: 0.57; MM: 0.49; LM: 0.45) after 48 h was greater for EM compared to MM and LM, with no difference between the latter two. With advancing maturity, total gas (EM: 166.6; MM: 149.7; LM: 119.3 mL), CH4 production (EM: 21.4; MM: 17.6; LM: 14.8 mL), and methane production per g NDF digested decreased at 48 h (EM: 120; MM: 92; LM: 74 mL/g NDF digested). Ensiling less mature grass resulted in more CH4 per unit of NDF digested.

Keywords: Grass silage; maturity; methane production

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/09064702.2012.671846

Affiliations: 1: Agriculture and Agri-Food Canada Research Centre, Lethbridge,Alberta, Canada 2: Department of Animal and Aquacultural Sciences,Norwegian University of Life Sciences, Ås, Norway

Publication date: March 1, 2012

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