This technical report examines the connection between climate change and livestock, focusing on the impacts on livestock production systems. The study explores various methodologies from the literature and analyses their application in a practical test case in the Lao People's Democratic Republic. The assessment estimates direct and indirect effects of climate change on the livestock sector by focusing on three main methodologies retrieved from the scientific literature and applied to the specific case of Lao People's Democratic Republic. The results reveal significant effects of climate change on cattle and buffaloes, the main ruminant species in the country. The findings showed significant losses in Lao People's Democratic Republic production due to heat stress affecting dry matter intake. For instance, under the representative concentration pathway 2.6 scenario, the analysis estimated a 19 percent loss in meat production and a 18 percent loss in milk production by 2085. The thermal-humidity index, used as a proxy for milk production estimation, yielded similar results. On a positive note, the study revealed that the carrying capacity and the number of potential livestock units are expected to increase from 2020 to 2080, counteracting some of the negative effects of climate change induced by heat stress. The proposed methodologies can be combined to provide a comprehensive understanding of the current and future state of the livestock population and production. While the effects may vary in different regions and production systems, the report emphasizes the importance of implementing strategies to mitigate climate change impacts. Overall, this report provides crucial information for policymakers and agencies involved with the livestock sector to guide interventions and address the challenges posed by climate change.