It is indisputable that climate is an important factor in many livestock diseases. Nevertheless, our knowledge of the impact of climate change on livestock infectious diseases is much less certain. Therefore, the aim of the article is to conduct a systematic review of the literature on the topic utilizing available retrospective data and information. Across a corpus of 175 formal publications, limited empirical evidence was offered to underpin many of the main arguments. The literature reviewed was highly polarized and often inconsistent regarding what the future may hold. Historical explorations were rare. However, identifying past drivers to livestock disease may not fully capture the extent that new and unknown drivers will influence future change. As such, our current predictive capacity is low. We offer a number of recommendations to strengthen this capacity in the coming years. We conclude that our current approach to research on the topic is limiting and unlikely to yield sufficient, actionable evidence to inform future praxis. Therefore, we argue for the creation of a reflexive, knowledge-based system, underpinned by a collective intelligence framework to support the drawing of inferences across the literature.
In the global South, dairying is often promoted as a means of poverty alleviation. Yet, under conditions of climate warming, little is known regarding the ability of small-scale dairy producers to maintain production and/or the robustness of possible adaptation options in meeting the challenges presented, particularly heat stress. The authors created a simple, deterministic model to explore the influence of breed and heat stress relief options on smallholder dairy farmers in Odisha, India. Breeds included indigenous Indian (non-descript), low-grade Jersey crossbreed and high-grade Jersey crossbreed. Relief strategies included providing shade, fanning and bathing. The impact of predicted critical global climate parameters, a 2°C and 4°C temperature rise were explored. A feed price scenario was modelled to illustrate the importance of feed in impact estimation. Feed costs were increased by 10% to 30%. Across the simulations, high-grade Jersey crossbreeds maintained higher milk yields, despite being the most sensitive to the negative effects of temperature. Low-capital relief strategies were the most effective at reducing heat stress impacts on household income. However, as feed costs increased the lower-grade Jersey crossbreed became the most profitable breed. The high-grade Jersey crossbreed was only marginally (4.64%) more profitable than the indigenous breed. The results demonstrate the importance of understanding the factors and practical trade-offs that underpin adaptation. The model also highlights the need for hot-climate dairying projects and programmes to consider animal genetic resources alongside environmentally sustainable adaptation measures for greatest poverty impact.
The dairy sector is a significant source of anthropogenic greenhouse gas (GHG) emissions. The increasingly robust emission inventories allow researchers to consider mitigation. However, there is a gap in knowledge regarding the extent to which mitigation research has been implemented as policy. The authors undertook a systematic a review of national-level dairy policy of 23 countries broadly following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) protocols. The aim of the study was to identify international trends in dairy sector GHG emission reduction policy. Sampled countries included the 12 countries with the highest quantity of dairy sector enteric methane emission and 11 Annex I countries with the largest number of dairy cattle per capita. A total of 34 documents were collated containing 62 policies across five themes. Themes included: nutrition, manure, health, breeding and management. Thirty-one policies were identified for both the high emission nations and Annex I nations with the largest number of dairy cattle per capita. Nutrition based interventions account for 36% (n=11) of all policies identified for high emitting nations. Manure based interventions account for 48% (n=15) of all policies identified for Annex I nations with the largest number of dairy cattle per capita. Across the sample, policymakers favoured manure management strategies (n=24), particularly anaerobic digestion which accounted for 21% (n=13) of all identified policies. Nutrition based mitigation strategies were also preferred (n=17). Policies aimed at reducing sector size were 2 largely ignored (n=4). The results indicate that significant mitigation is unlikely as manure emissions are only a small portion of total dairy sector emissions. The study concludes that policymakers are selecting the less politically sensitive mitigation strategies at the cost of emission reduction.
Within the dairy sector, the effects of climate change are particularly diverse as cows are affected by, and a significant contributor to climate change. With a burgeoning body of work indicating the importance of livestock's contribution to climate change (via Greenhouse Gas (GHG) emissions), the dairy sector will increasingly be targeted for emission reduction. Yet, gaps in knowledge remain as to the effectiveness of interventions in achieving emission reductions. The investigation examines two high-profile Indian policies to evaluate their effectiveness in reducing the methane emission intensity of milk production in Odisha, India. Selected policies included the installation of smallscale anaerobic digesters and the control of Foot and Mouth Disease (FMD). The interventions were evaluated at the cow level informed by data collected from 115 smallholder dairy producers in Puri (n=31) and Khurda (n=84) districts in Odisha, India. The installation of an anaerobic digester was found to increase methane emission intensity by 4.41-5.01%. Control of FMD reduced methane emission intensity by 3.68-12.95% depending on the infection scenario considered. The findings highlight the importance of contextually relevant and multi-sectoral approaches to mitigation as the increase in methane emission intensity following anaerobic digester installation represents movement of emissions from the energy sector into the dairy sector where mitigation is inherently more complex. Thus, the long-term usefulness of anaerobic digester installation as a mitigation strategy is limited.
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