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Title

Use of nitrate and 'Propionibacterium acidipropionici' to reduce methane emissions and increase wool growth of Merino sheep

Author(s)
de Raphelis-Soissan, Victoire
Li, Li
Godwin, Ian  
Barnett, Mark  
Perdok, H B
Hegarty, Roger  
Date Issued
2014
Permanent link to this record
https://hdl.handle.net/1959.11/17680
DOI
10.1071/AN14329
Research Output Type
Journal Article
HERDC Category
C1 Refereed Article in a Scholarly Journal
Abstract
The effects of dietary nitrate and of Propionibacterium acidipropionici (PA) on methane and nitrous oxide emissions, methaemoglobinaemia, volatile fatty acid (VFA) concentration and productivity of sheep were studied. It was hypothesised that PA supplementation would increase the rate of nitrite reduction to ammonia in the rumen and therefore reduce risks of methaemoglobinaemia. Fine-wool Merino wethers (n ≤ 28; 31.8 ± 3.7 kg; 11 months of age) were acclimated to four isonitrogenous and isoenergetic diets based on oaten chaff (1.0 kg/day) supplemented with either urea (1.1% of DM; T1 and T2) or a nitrate source (2.0% of DM; T3 and T4) while T2 and T4 were also supplemented with PA (11.5 × 1010 CFU/day). Replacing urea with nitrate lowered methane production (g/day) by 19% and methane yield (g/kg DMI) by 15%, improved clean wool growth by 12% (P < 0.001) and tended to increase skin temperature (P < 0.1). Nitrate increased ruminal acetate to propionate ratio by 27%, increased plasma nitrite and nitrate concentrations and blood methaemoglobin (MetHb) level up to 45% of total haemoglobin. Nitrous oxide emission from sheep confined in respiration chambers was higher (P < 0.001) when nitrate was fed, lowering the net benefit of methane mitigation on global warming potential (CO2 equivalents/kg DMI) by 18%. In contrast, PA had little effect, decreasing total VFA concentration (P < 0.05), increasing rumen pH (P < 0.05) and clean wool growth (P < 0.05) of urea-fed sheep. This study confirmed the beneficial effects of nitrate on net greenhouse gas reduction and wool growth, but showed that methaemoglobinaemia risks may be higher when diets are fed at a restricted level and contain only low levels of readily fermented carbohydrate. PA supplementation was not effective in reducing methaemoglobinaemia, but did increase clean wool growth of urea-fed sheep.
Source
Animal Production Science, 54(10), p. 1860-1866
Publisher
CSIRO Publishing
Place of Publication
Australia
Fields of Research (FoR) 2020
300303 Animal nutrition
Socio-Economic Objectives (SEO) 2020
100413 Sheep for wool
280102 Expanding knowledge in the biological sciences
ISSN
1836-5787
1836-0939
Keywords
Animal Nutrition
Owning collection
Journal Article
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