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Cow management
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The effect of nutritional management of the dairy cow on reproductive efficiency
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Serum biochemical parameters and embryo production during superovulatory treatment in dairy cattle
The objective of this study was to determine the relationship between the number of transferable embryos (TE) and various blood chemistry parameters as a reflection of the metabolic state of cows after superovulatory treatment. read more >
Risk factors for resumption of postpartum estrous cycles and embryonic survival in lactating dairy cows
The objectives of this study were to evaluate factors associated with resumption of postpartum estrous cycles and embryonic survival in lactating dairy cows. Holstein cows, 6396 from four dairy farms were evaluated to determine the relationships among parity, body condition score (BCS) at calving and at AI, season of year when cows calved, and milk yield on resumption of postpartum estrous cycles by 65 days postpartum, and all the previous variables, estrual or anestrus and AI protocol on conception rates and embryonic survival at the first postpartum insemination. read more >
Progesterone concentration, follicular development and induction of cyclicity in dairy cows receiving intravaginal progesterone inserts
Objectives were to evaluate progesterone concentrations after cows had initiated estrous cycles following calving and induction of estrous cycles in postpartum anovular high-producing Holstein dairy cows treated with controlled internal drug releasing (CIDR). read more >
Characterization of the Immune Response in the Placenta of Cattle Experimentally Infected with Neospora caninum in Early Gestation
A serial examination of three groups of cattle infected intravenously (iv) (Group 1, n=8) or subcutaneously (sc) (Group 2, n=8) with live Neospora caninum tachyzoites or with VERO cells (Group 3, n=8) at 70 days’ gestation was carried out and the nature of the inflammatory responses in the placenta and the presence of parasite antigen were analysed. read more >
Decreasing fertility in dairy cows confirmed by facts
There are various factors associated with decreasing fertility, especially those related to management. In addition to information collected worldwide, the authors have used data from 250,000 dairy cows in Quebec, Ontario and New Brunswick, Canada to describe current trends. read more >
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