ABSTRACT

The whole-farm model HolosNorBeef was used to estimate the efficiency of GHG emission mitigation strategies in Norwegian beef cattle herds. Various mitigation scenarios, involving female reproductive performance (i.e. calf mortality rate and the number of calves produced per cow per year), production efficiency of young bulls for slaughter (i.e. age at slaughter and carcass weight), and supplementation of an inhibitor currently reported as promising for enteric methane (CH₄) inhibition (3-nitrooxypropanol; 3-NOP) was investigated in herds of British and Continental breeds. Reducing calf mortality and increasing the number of produced calves per cow per year both reduced emission intensities by 3% across breeds. Continental breeds showed greater potential of reducing emission intensities due to increased carcass production. Combining mitigation options in a best case scenario reduced the total emissions by 11.7% across breeds. The emission intensities could be further reduced by 8.3% with the use of 3-NOP.

摘要

使用全农场模型HolosNorBeef来评估挪威肉牛群温室气体减排策略的效率。各种缓解方案，包括雌性生殖性能（即小牛死亡率和每头母牛每年生产的犊牛数量），公牛屠宰的生产效率（即屠宰时的年龄和weight体重量）以及目前据报道补充的抑制剂有望用于肠甲烷（CH ₄）抑制作用（3-硝基氧丙醇； 3-NOP）已在英国和美国大陆的牛群中进行了研究。降低小牛死亡率和增加每头牛每年生产的小牛数量，两个品种的排放强度均降低了3％。由于increased体产量增加，大陆品种显示出更大的减少排放强度的潜力。在最佳情况下结合缓解措施，各品种的总排放量减少了11.7％。使用3-NOP可以使发射强度进一步降低8.3％。