The environmental impact of fertility in dairy cows: a modelling approach to predict methane and ammonia emissions

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Where are the best opportunities for reducing greenhouse gas emissions in the food system (including the food chain) (2011, background): “Higher infertility and mortality rates in turn undermine the methane savings achieved since initially unproductive replacement heifers need to be reared to compensate (Garnsworthy, 2004).”
Methane mitigation in ruminants: from microbe to the farm scale. (2010, background): “Highproducing dairy cows have lower fertility and shorter productive careers, so that the difference in the part of nonproductive requirements between high-producing cows and low-producing cows is reduced (Garnsworthy, 2004); an increase in fertility should decrease CH4 emissions by cows at career’s”