Fertility in the high-producing dairy cow ☆

By Jennie Pryce, M. Royal, P. Garnsworthy, I. L. Mao. 2004

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The impact of genetic selection for increased milk yield on the welfare of dairy cows (2010, background): “Lameness decreases milk yield and is an important cause of culling (Rajala-Schultz et al 1999).”
The environmental impact of fertility in dairy cows: a modelling approach to predict methane and ammonia emissions (2004, background): “Approximately 50% of this is due to genetics and 50% to improved feeding and management (Pryce et al., 2004).”
A review of the causes of poor fertility in high milk producing dairy cows (2010, background): “However, unlike lactating dairy cows, nulliparous dairy heifers with similar genetic merit for milk production have higher conception rates (39% vs 64%, respectively) and this has not decreased during the period of genetic improvement in milk yield (Pryce et al., 2004) .”