Animal production influences the environment through land-use changes and the cycle of nutrients such as CO₂. Pork production is an essential sector of agribusiness nowadays. This type of farming will also be affected by climate change since the production of animal feeds depends on the weather. New information on pork production is vital to study the amount of feed wasted through sow yield and environmental inefficiency on farms. Many sow indexes have been used in the last years, especially addressing reproduction efficiency. However, there is a lack of research on production losses from Greenhouse Gas emissions. The aim of the assessment was to estimate the daily feed intake of sows and the amount of feed consumed during their nonproductive days, correlating these results to greenhouse gas emissions. The variables were analyzed by the Life Cycle Assessment tool at Tier 3 level. The physiology of metabolic digestion related to sow respiration was calculated for each life stage. There were six Brazilian scenarios: 1 and 2 – farms from the Midwest region; 3 to 6 – different piglets systems from all regions. Producing piglets with 6.0 to 10.0 kg requires much time and feed intake, and feed processing depends on natural resources. Daily feed intakes during nonproductive days corresponded to 16,315.30 tons of total feed intake/year. Each scenario showed different results. For instance, Scenario 1 emitted 2.80 kg of CO₂eq./kg of piglet, and Scenario 4 emitted 3.89 kg of CO₂eq./kg of piglet. The environmental impacts analyzed lead us to conclude that the Brazilian production can be more efficient. Nonproductive days were harmful for weaned piglet production as the total feed intake of sows correlate with born alive and weaned piglets. Greenhouse Gas emissions can be included in sows yield calculation.

动物生产通过土地利用变化和 CO ₂等养分循环影响环境. 猪肉生产是当今农业企业的重要部门。这种类型的农业也将受到气候变化的影响，因为动物饲料的生产取决于天气。关于猪肉生产的新信息对于研究因母猪产量和农场环境效率低下而浪费的饲料量至关重要。过去几年使用了许多母猪指数，特别是解决繁殖效率问题。然而，缺乏对温室气体排放造成的生产损失的研究。评估的目的是估计母猪的每日采食量和非生产日消耗的饲料量，将这些结果与温室气体排放相关联。变量通过生命周期评估工具在第 3 层级别进行分析。计算每个生命阶段与母猪呼吸相关的代谢消化生理。巴西有六种情景：1 和 2 – 来自中西部地区的农场；3 到 6 个——来自所有地区的不同仔猪系统。生产 6.0 至 10.0 公斤的仔猪需要大量时间和采食量，饲料加工依赖于自然资源。非生产日期间的每日采食量相当于 16,315.30 吨/年的总采食量。每个场景都显示出不同的结果。例如，情景 1 排放了 2.80 千克二氧化碳 非生产日期间的每日采食量相当于 16,315.30 吨/年的总采食量。每个场景都显示出不同的结果。例如，情景 1 排放了 2.80 千克二氧化碳 非生产日期间的每日采食量相当于 16,315.30 吨/年的总采食量。每个场景都显示出不同的结果。例如，情景 1 排放了 2.80 千克二氧化碳₂ eq./kg 仔猪，场景 4 排放了 3.89 kg CO ₂ eq./kg 仔猪。分析的环境影响使我们得出结论，巴西的生产效率更高。非生产天数对断奶仔猪的生产有害，因为母猪的总采食量与出生的活产和断奶仔猪相关。温室气体排放可以包括在母猪产量计算中。