Please use this identifier to cite or link to this item:
Title: Impact of gut kinetics on methane production within the sheep
Contributor(s): Barnett, Mark Clem (author); Hegarty, Roger  (supervisor); Godwin, Ian  (supervisor); Goopy, John (supervisor)
Conferred Date: 2013
Copyright Date: 2013
Open Access: Yes
Handle Link:
Abstract: Methane emissions from ruminant livestock is a major source of greenhouse gases, accounting for approximately two-thirds of anthropogenic methane sources. Methane yield from ruminants (MY; g/kg DM intake) is known to be positively correlated with the mean retention time (MRT) of rumen contents, and MRT in the rumen is largely controlled by the contractile forces of the reticulo-rumen and the relaxing of the reticulo-omasal orifice. The discovery of immuno-reactive endocrine and neural cells distributed throughout the epithelia and glands of the digestive tract suggest that the endocrine system may play a key role in regulating digesta MRT and MY in ruminants. The thyroid hormone triiodothyronine (T₃), known to influence digesta kinetics, was used to initiate our studies to modify digesta MRT and determine the impact that digesta MRT has on the production of enteric methane and MY. To investigate the influence digesta kinetics had on ruminant MY, it was necessary to develop a kinetic model capable of accurately estimating the rate of flow of digesta through the digestive tract. An extensive review of existing published mathematical models for ruminant digesta kinetics was conducted and a model developed by Aharoni et al. (1999) for the estimation of cattle digesta kinetics was selected and modified to produce a new multicompartmental double-marker digestive tract model for use in sheep.
Publication Type: Thesis Doctoral
Fields of Research (FoR) 2008: 059999 Environmental Sciences not elsewhere classified
070702 Veterinary Anatomy and Physiology
070204 Animal Nutrition
Fields of Research (FoR) 2020: 419999 Other environmental sciences not elsewhere classified
300902 Veterinary anatomy and physiology
300303 Animal nutrition
Socio-Economic Objective (SEO) 2008: 830310 Sheep - Meat
830311 Sheep - Wool
839802 Management of Greenhouse Gas Emissions from Animal Production
Socio-Economic Objective (SEO) 2020: 100412 Sheep for meat
100413 Sheep for wool
190302 Management of greenhouse gas emissions from animal production
Rights Statement: Copyright 2013 - Mark Clem Barnett
HERDC Category Description: T2 Thesis - Doctorate by Research
Appears in Collections:School of Environmental and Rural Science
Thesis Doctoral

Files in This Item:
10 files
File Description SizeFormat 
open/MARCXML.xmlMARCXML.xml3.16 kBUnknownView/Open
open/SOURCE03.pdfAbstract292.13 kBAdobe PDF
Download Adobe
open/SOURCE04.pdfThesis2.02 MBAdobe PDF
Download Adobe
1 2 Next
Show full item record
Google Media

Google ScholarTM


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.