Establishment of pregnancy in cattle is complex and encompasses ovulation, fertilization,
blastocyst formation and growth into an elongated conceptus, pregnancy recognition …

Despite passing routine laboratory tests of semen quality, bulls used in artificial insemination
(AI) exhibit a significant range in field fertility. The objective of this study was to determine …

Elongation of the preimplantation conceptus is a requirement for pregnancy success in
ruminants, and failures in this process are highly associated with subfertility in dairy cattle …

A major unresolved issue is how the uterus influences infertility and subfertility in cattle.
Serial embryo transfer was previously used to classify heifers as high-fertile (HF), subfertile …

ABSTRACT A single ovulation, reciprocal embryo transfer study was used to investigate
effects of oocyte competence and maternal environment on pregnancy establishment and …

The objective was to evaluate the effect of service sire on pregnancy results during different
periods of embryonic and fetal development. Angus cows (n= 658) were timed artificially …

In brief The first week of gestation is a period of major pregnancy loss in cattle, this study
reveals that the male plays a key role in regulating embryonic development during this time …

Background Subfertility is a major issue facing the dairy industry as the average US Holstein
cow conception rate (CCR) is approximately 35%. The genetics underlying the physiological …

The service sire has been recognized as an important factor affecting herd fertility in dairy
cattle. Recent studies suggest that genetic factors explain part of the difference in fertility …

Causes of variation amongst recipients within a herd in their ability to initiate and maintain
pregnancy is largely unknown. In order to develop an experimental resource to understand …