Loss of pregnancy can occur at many different stages of gestation and for a variety of causes
but clearly produces a negative impact for reproductive and economic performances of dairy …

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 …

The changes in the environmental factors like ambient temperature, relative humidity, wind
speed and solar radiation causes stresses in lactating cattle. Heat stress is a condition in …

The dairy industry in the United States has changed dramatically in the last decade. Milk
production per cow has increased steadily because of a combination of improved …

In dairy cows inseminated during the hot months of the year, there is a decrease in fertility.
Different factors contribute to this situation; the most important are a consequence of …

Reproductive failure in inseminated cattle results from poor fertilization and embryo survival.
Recent studies utilizing dairy and beef cattle indicate that fertilization rates are higher for …

Increased liver blood flow (LBF) resulting from elevated feed intake in lactating dairy cows
may increase steroid metabolism. Continuous infusion of bromosulphthalein (BSP; …

Recently a protocol was developed that precisely synchronizes the time of ovulation in
lactating dairy cows (Ovsynch; GnRH-7d-PGF2α-2d-GnRH). We evaluated whether initiation …

Administration of gonadotropin-releasing hormone (GnRH) induces a surge of luteinizing
hormone and ovulation in a variety of species, including human beings. Our objectives were …

The objectives of these experiments were as follows:(1) to determine the association
between circulating concentrations of pregnancy-associated glycoproteins (PAG) and late …