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Can animal genetics and flock management be used to reduce greenhouse gas emissions but also maintain productivity of wool-producing enterprises?

Citation

Alcock, DJ and Harrison, MT and Rawnsley, RP and Eckard, RJ, Can animal genetics and flock management be used to reduce greenhouse gas emissions but also maintain productivity of wool-producing enterprises?, Agricultural Systems, 132 pp. 25-34. ISSN 0308-521X (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Elsevier

DOI: doi:10.1016/j.agsy.2014.06.007

Abstract

Farm intervention strategies that reduce greenhouse gas (GHG) emissions from the livestock industries may reduce global emissions associated with agriculture, though farmers are unlikely to adopt new practises unless they also improve farm profitability. Here our objective was to explore the effect of manipulating enterprise management or animal genotype on whole-farm production, profitability, enteric methane emissions and wool emissions intensities of sheep enterprises in southern Australia. Two enterprises that differed in lamb sale age were simulated using the model GrassGro; surplus animals were sold at either 18 weeks (weaner) or 12 months old (yearling). We examined the influence of lambing time (LT), joining maiden ewes at 7 months instead of 19 months of age (JA), increasing lamb weaning rates (WR), or superior genotypes with 10% improvement in fleece weight (FW), feed efficiency (FE) and/or methane yield (MY).

Annual wool production, methane emissions, wool emissions intensities and profitability averaged across the baseline enterprises were 55 kg clean wool/ha, 3.2 t CO2-eq/ha, 31 kg CO2-eq/kg clean wool and $569/ha. Relative to these values average profitability increased by up to 18%, 15%, 10%, 9%, 8% and 0% for the JA, WR, FW, FE, LT and MY strategies; associated changes in wool production were 0%, −3%, 11%, 0%, 2% and 0%, and wool emissions intensities changed by −4%, −8%, −5%, −7%, 0% and −10%, respectively.

Increasing weaning rate and introducing genotypes with lower methane yield afforded the greatest reductions in wool emissions intensities. Divergence between the relative effects of alternative strategies on farm economics, production and wool emissions intensities suggests that farm adaptations will depend on the goal of the individual farmer. If the goal is to increase profitability, flock management interventions are most beneficial; if the goal is to reduce emissions intensity, superior breeds containing improvements in several genetic traits have the greatest potential. We demonstrate that no intervention to farm management, animal genotype or otherwise is likely to achieve simultaneous improvements in all of production, profitability, net farm emissions and wool emissions intensity. Under current carbon prices, subsidies greater than $150/t CO2-eq would be required if economic returns from GHG abatement were to equal those from increased productivity, suggesting there would be little incentive for wool producers to participate in the Carbon Farming Initiative under the intervention strategies modelled here.

Item Details

Item Type:Refereed Article
Keywords:abatement, biophysical modelling, feed use efficiency, micron, mitigation, wool
Research Division:Agricultural and Veterinary Sciences
Research Group:Agriculture, Land and Farm Management
Research Field:Agricultural Production Systems Simulation
Objective Division:Animal Production and Animal Primary Products
Objective Group:Environmentally Sustainable Animal Production
Objective Field:Management of Greenhouse Gas Emissions from Animal Production
Author:Harrison, MT (Dr Matthew Harrison)
Author:Rawnsley, RP (Dr Richard Rawnsley)
ID Code:94765
Year Published:2015
Web of Science® Times Cited:7
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2014-09-17
Last Modified:2017-11-06
Downloads:0

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