Pivotal periods for pregnancy loss during the first trimester of gestation in lactating dairy cows
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 …
but clearly produces a negative impact for reproductive and economic performances of dairy …
A review of the causes of poor fertility in high milk producing dairy cows
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 …
has increased. Many hypotheses have been proposed to explain this including issues of …
[PDF][PDF] Temperature-humidity indices as indicators to heat stress of climatic conditions with relation to production and reproduction of farm animals
AA Habeeb, AE Gad, MA Atta - International Journal of …, 2018 - danida.vnu.edu.vn
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 …
speed and solar radiation causes stresses in lactating cattle. Heat stress is a condition in …
[HTML][HTML] Reproductive loss in high-producing dairy cattle: where will it end?
MC Lucy - Journal of dairy science, 2001 - Elsevier
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 …
production per cow has increased steadily because of a combination of improved …
Heat stress and seasonal effects on reproduction in the dairy cow—a review
F De Rensis, RJ Scaramuzzi - Theriogenology, 2003 - Elsevier
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 …
Different factors contribute to this situation; the most important are a consequence of …
The effect of embryonic death rates in cattle on the efficacy of estrus synchronization programs
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 …
Recent studies utilizing dairy and beef cattle indicate that fertilization rates are higher for …
[HTML][HTML] High feed intake increases liver blood flow and metabolism of progesterone and estradiol-17β in dairy cattle
Increased liver blood flow (LBF) resulting from elevated feed intake in lactating dairy cows
may increase steroid metabolism. Continuous infusion of bromosulphthalein (BSP; …
may increase steroid metabolism. Continuous infusion of bromosulphthalein (BSP; …
Synchronization rate, size of the ovulatory follicle, and pregnancy rate after synchronization of ovulation beginning on different days of the estrous cycle in lactating …
JLM Vasconcelos, RW Silcox, GJM Rosa, JR Pursley… - Theriogenology, 1999 - Elsevier
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 …
lactating dairy cows (Ovsynch; GnRH-7d-PGF2α-2d-GnRH). We evaluated whether initiation …
Relationship between follicle size at insemination and pregnancy success
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 …
hormone and ovulation in a variety of species, including human beings. Our objectives were …
[HTML][HTML] Circulating concentrations of bovine pregnancy-associated glycoproteins and late embryonic mortality in lactating dairy herds
KG Pohler, MHC Pereira, FR Lopes, JC Lawrence… - Journal of dairy …, 2016 - Elsevier
The objectives of these experiments were as follows:(1) to determine the association
between circulating concentrations of pregnancy-associated glycoproteins (PAG) and late …
between circulating concentrations of pregnancy-associated glycoproteins (PAG) and late …