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 …

This manuscript focuses on potential changes in reproductive physiology that occur due to
high milk production in lactating dairy cows. Four reproductive measures are discussed …

Increased capacity for milk production in dairy cows has been associated with a decline in
fertility. Following parturition, nutritional requirements increase rapidly with milk production …

Nutrition is a major factor affecting cow reproductive efficiency. Long-term moderate or
chronic dietary restriction results in a gradual reduction in dominant follicle (DF) growth rate …

Management, nutrition, production, and genetics are the main reasons for the decline in
fertility in the modern dairy cow. Selection for the single trait of milk production with little …

Data derived principally from peripheral tissues (fat, muscle and liver) show that insulin
signals via diverse interconnecting intracellular pathways and that some of the major …

Regulation of ovarian activity is an integrated process encompassing both extraovarian
signals and intrafollicular factors. Initiation of primordial follicle growth and the early stages …

Cows with an extended interval from calving to first ovulation (PPI) have increased intervals
from calving to conception and are more likely to be culled compared with cows with a short …

A longitudinal study was conducted to examine the relationship between lameness and
delayed ovarian cyclicity during the first 60 d postpartum and days to first luteal activity …

This review addresses the suggestion that the decline in dairy reproductive performance, as
increasingly observed these days, may be due to a hampered process of metabolic …