A5050792478- Ruminant Nutrition and Digestive Physiology
- Reproductive Physiology in Livestock
- Effects of Environmental Stressors on Livestock
- Agriculture Sustainability and Environmental Impact
- Genetic and phenotypic traits in livestock
- Odor and Emission Control Technologies
- Pasture and Agricultural Systems
- Soil Carbon and Nitrogen Dynamics
- Bioenergy crop production and management
- Plant and fungal interactions
- Fatty Acid Research and Health
- Plant Taxonomy and Phylogenetics
- Cancer-related molecular mechanisms research
- Coccidia and coccidiosis research
- Animal Behavior and Welfare Studies
- Fluoride Effects and Removal
- Plant nutrient uptake and metabolism
- Insect and Arachnid Ecology and Behavior
- Horticultural and Viticultural Research
- Agriculture and Farm Safety
- Parasite Biology and Host Interactions
- Edible Oils Quality and Analysis
- Fire effects on ecosystems
- Microbial Metabolites in Food Biotechnology
- Advanced Chemical Sensor Technologies
Agriculture Victoria
2017-2020
Ellinbank Observatory
2013-2020
Government of Victoria
2017
Teagasc - The Irish Agriculture and Food Development Authority
2010-2016
The University of Melbourne
2013-2014
University College Dublin
2011
AgResearch
2004-2008
Significance Methane from enteric fermentation in the ruminant digestive system is a major contributor to anthropogenic greenhouse gas emissions United States and worldwide. also net loss of feed energy animal. This study was undertaken investigate effect methane inhibitor on lactating dairy cows. The experiment demonstrated that, under industry-relevant conditions, persistently decreased by 30% emissions, without negatively affecting animal productivity. spared partially used for tissue...
This study examined the relationship of residual feed intake (RFI) and performance with methane emissions, rumen fermentation, digestion in beef heifers. Individual DMI growth were measured for 22 Simmental heifers (mean initial BW 449 kg, SD = 46.2 kg) offered grass silage ad libitum 120 d. Ultrasonically scanned muscle fat depth, BCS, muscularity score, skeletal measurements, blood variables, fermentation (via stomach tube), total tract digestibility (indigestible marker) measured. Methane...
The sulphur hexafluoride (SF6) tracer technique enables determination of enteric methane emissions from large numbers individual ruminant animals. objective this research was to identify and correct substantial errors within the SF6 technique. Six experiments were undertaken using respiration chamber, laboratory or techniques. Experiment 1 used chambers demonstrate that daily pattern dairy cows related their feed intake. In contrast, emission these constant independent emission. This finding...
The main goal of this study was to develop, apply, and validate a new method predict an indicator for CH4 eructed by dairy cows using milk mid-infrared (MIR) spectra. A novel feature model the consideration lactation stage reflect changes in metabolic status cow. total 446 daily measurements were obtained SF6 on 142 Jersey, Holstein, Holstein-Jersey cows. corresponding samples collected during these analyzed MIR spectroscopy. first derivative applied To calibration equation incorporating...
This review examines research aimed at reducing enteric methane emissions from the Australian dairy industry. Calorimeter measurements of 220 forage-fed cows indicate an average yield 21.1 g (CH4)/kg dry matter intake. Adoption this empirical yield, rather than equation currently used in greenhouse gas inventory, would reduce attributed to industry by ~10%. Research also indicates that dietary lipid supplements and feeding high amounts wheat substantially emissions. It is estimated that,...
Plantain (Plantago lanceolata L.) has recently been thrust into the limelight as a potential tool for mitigating nitrogen losses from New Zealand pastoral environment. It is claimed to possess characteristics reduce leaching through both animal and soil-based mechanisms. This review examines use of plantain in pastures research that led these claims. The focus on evaluation scientific evidence mechanisms which proposed nitrate leaching, well implementation farm systems. clearly increases...
Mitigating the proportion of energy intake lost as methane could improve sustainability and profitability dairy production. As widespread measurement emissions is precluded by current in vivo methods, development an easily measured proxy desirable. An equation has been developed to predict from mid-infrared (MIR) spectra milk within routine milk-recording programs. The main goals this study were prediction for MIR illustrate its already available usefulness a high throughput phenotypic...
Forage brassica and chicory crops provide an alternative to perennial grass pastures as a forage supply for grazing dairy cows during summer, but there is little information about their effects on milk production methane (CH4) emissions. Thirty-two Holstein–Friesian were fed 10 days diet of lucerne cubes (750 g/kg DM) grain (250 (CON) or diets in which (410 DM, FBR) reproductive-stage RCH) offered with (340 DM). Cows the FBR produced more energy-corrected (25.4 kg/day) than did CON (22.7...
Globally, annual production of grape marc (GM), the residue skins, seeds and stems remaining after making wine, has been estimated to be approximately nine million tonnes. No previous studies have compared effects on milk methane emissions when GM from either red or white grapes was fed dairy cows. This experiment examines partial replacement a perennial ryegrass (Loliumperenne L.) based diet with yield composition emissions. Thirty-two Holstein cows in early lactation were offered control...
Methane (CH4) emissions from dairy cows are technically difficult and expensive to measure. Recently, some researchers have found correlations between the concentrations of specific fatty acids in milk fat CH4 that could obviate need for direct measurement. In this research, data on individual cow concentration caprylic acid (C8:0) total C18 were collated eight experiments involving 27 forage-based diets 246 Holstein-Friesian cows. Linear regressions both C8:0 produced published used...
There has been little research that quantified methane (CH4) yields when dairy cows consume diets containing wheat grain. Furthermore, although rumen-fistulated animals have used in many experiments concerned with measuring CH4 emissions, no examined the effect of rumen fistulation on vivo emissions and yield. This experiment effects including either or corn grain diet milk components, yields, intensities. Eight six non-fistulated Holstein late lactation were offered a wheat-based (WHT)...
Selecting ryegrass for higher concentrations of lipid to increase dietary energy density may the productivity pasture-fed animals and reduce rumen methane emissions. A proof-of-concept study was undertaken identify responses sheep increasing intake. Sheep housed in metabolism crates were fed fresh at 120% ad libitum intake two 17-day periods with dry matter (DMI) balance measured over final 7 days five consecutive end each period. blend linseed sunflower oils (3 : 1) infused directly into...
The confirmation that Epichloë endophytes are important for pest resistance in New Zealand pastures led to the development of a range novel endophyte strain × host plant combinations enhance persistence grass, while mitigating adverse effects on grazing animals. Successfully delivering these pastoral industry has required scientific and commercial capabilities. In March 2012, proprietary seed established Endophyte Technical Committee. This is cooperative forum ensure strains commerce or...
Previous research has documented nutritive characteristics of perennial ryegrass-based pastures and subsequent nutrient-selection differentials when dairy cows graze such pastures, but there been little comparable on alternative pasture grasses. The aim the present study was to compare pre-grazing four grasses, how nutrients vary with plant height, selection achieved by grazing these grasses in late winter spring. utilised an established field experiment, replicates monoculture swards...