Fertility in dairy cows has declined over the past five decades as milk production per cow
has increased. Many hypotheses have been proposed to explain this including issues of …

Contents There is evidence that the reproductive performance of dairy cows has declined as
milk yields have increased over the last 40 years. Identifying the precise cause (s) of this …

Evolutionary biology provides reasons for why the intensive selection for milk production
reduces reproductive success rates. There is considerable exploitable genetic variation in …

Contents Fertility in high yielding dairy cows is declining, and there is increasing evidence to
presume that oocyte and embryo quality are major factors in the complex pathogenesis of …

Background Drivers of change in dairy herd health management include the significant
increase in herd/farm size, quota removal (within Europe) and the increase in technologies …

Contents Dairy cow fertility has been declining during since the mid‐80s and this has given
rise to numerous scientific studies in which important parts of the pathogenesis are …

In pasture-based dairy systems, supplementary feeds are used to increase dry matter intake
and milk production. Historically, supplementation involved the provision of the same …

Simple Summary Selection for an increased meatiness in beef cattle has resulted in double-
muscled (DM) animals, owing to the inactivation of the myostatin gene. These animals are …

Contents For several decades, researchers worldwide report a decrease in fertility in high‐
yielding dairy cows, most probably based on conflicting metabolic and reproductive needs …

Contents Negative energy balance (NEB) in high yielding dairy cows early postpartum may
affect oocyte quality. Therefore, we tested the effect of two different β‐hydroxybutyrate (BHB) …