In its simplest form, longevity is defined as the ability to live a long life. Within the dairy
industry, longevity has been defined and measured in many different ways, and the aim of …

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 …

Milk yield per cow has more than doubled in the previous 40 years and many cows now
produce more than 20,000 kg of milk per lactation. The increase in production should be …

Genetic correlations between milk yield and reproductive measures in dairy cows are
unfavourable. This suggests that successful selection for higher yields may have led to a …

Relationships among milk production, body condition score (BCS), body weight (BW), and
reproduction were studied using logistic regression on data from 6433 spring-calving …

The history of research into artificial insemination (AI) is over two centuries old and its
commercial application now spans 75 years. It is appropriate to reflect on the contribution of …

Profiles of pregnancy specific proteins in relation to pregnancy status (pregnancy, early or
late embryonic mortality, later abortions) have been described in several ruminant species …

Trends in average days open and services per conception from 1976 to 1999 were
examined in 532 Holstein and 29 Jersey herds from 10 Southeastern states. Three-year …

Intensive genetic selection for increased milk production, coupled with increased dry matter
intakes has led to significant improvements in cow milk yield, however, this increase in milk …

Poor fertility has become a major reason for involuntary culling of dairy cows in the United
Kingdom. Calving interval (CI) and body condition score (BCS) are recorded, heritable …