Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/51767
Title: Use of dietary nitrate to increase productivity and reduce methane production of defaunated and faunated lambs consuming protein-deficient chaff
Contributor(s): Nguyen, S H (author); Barnett, M C  (author); Hegarty, R S  (author)
Publication Date: 2016
DOI: 10.1071/AN15525
Handle Link: https://hdl.handle.net/1959.11/51767
Abstract: 

The effects of dietary nitrate supplementation and defaunation on methane (CH4) emission, microbial protein outflow, digesta kinetics and average daily gain were studied in lambs fed chaff containing 4.1% crude protein in dry matter. Twenty ewe lambs were randomly allocated in a 2 x 2 factorial experiment (0% or 3.1% calcium nitrate supplementation and defaunated or faunated protozoal state). Nitrate supplementation increased blood methaemoglobin concentration (P < 0.05), rumen volatile fatty acids, ammonia concentration, dry matter intake, microbial protein outflow, average daily gain, dry matter digestibility, clean wool growth and wool fibre diameter (P < 0.01). Nitrate increased CH4 production (g/day) due to greater dry matter intake, but did not affect CH4 yield (g/kg dry matter intake). Nitrate-supplemented lambs had a shorter total mean retention time of digesta in the gut (P < 0.05). Defaunation reduced CH4 production and CH4 yield by 43% and 47%, but did not cause changes in dry matter intake, microbial protein outflow, average daily gain or clean wool growth. Defaunation decreased total volatile fatty acids and the molar percentage of propionate, but increased the molar percentage of acetate (P < 0.05). Interactions were observed such that combined treatments of defaunation and nitrate supplementation increased blood methaemoglobin (P = 0.04), and decreased CH4 yield (P = 0.01).

Publication Type: Conference Publication
Conference Details: GGAA 2016: 6th Greenhouse Gas and Animal Agriculture Conference, Melbourne, Australia, 14th -18th February, 2016
Source of Publication: Animal Production Science, 56(3), p. 290-297
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1836-5787
1836-0939
Fields of Research (FoR) 2020: 300303 Animal nutrition
Socio-Economic Objective (SEO) 2020: 280101 Expanding knowledge in the agricultural, food and veterinary sciences
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Appears in Collections:Conference Publication
School of Environmental and Rural Science

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