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Full-Text Articles in Life Sciences
Transition Cow Metabolites And Physical Traits Influence Days To First Postpartum Ovulation In Dairy Cows, S. Banuelos, J. S. Stevenson
Transition Cow Metabolites And Physical Traits Influence Days To First Postpartum Ovulation In Dairy Cows, S. Banuelos, J. S. Stevenson
Kansas Agricultural Experiment Station Research Reports
The objective of this study was to assess key metabolites and patterns of prepartum and postpartum physical activity as they relate to the onset of first postpartum ovulation in lactating dairy cows. Close-up dry Holstein cows (n = 82) and late gestation heifers (n = 78) were enrolled beginning 3 weeks before expected calving date (day 0). Cows were fit with Cow SensOor ear tags to assess transitional changes in eating, resting, rumination, activity, and ear-surface temperatures. Rectal temperatures were assessed and blood samples were collected on days 0, 3, 7, and 14 to measure concentrations of glucose, free fatty …
Resynchronizing Returns To Estrus After A Prior Insemination, J. S. Stevenson, J. A. Sauls-Hiesterman
Resynchronizing Returns To Estrus After A Prior Insemination, J. S. Stevenson, J. A. Sauls-Hiesterman
Kansas Agricultural Experiment Station Research Reports
In two experiments, GnRH and a progesterone insert (CIDR) were applied to cows after insemination (day 0) to reprogram or synchronize the returning estrus of cows that failed to conceive to that previous insemination. The combination of GnRH (day 14) and a CIDR insert (days 17 to 24) in experiment 1 (n = 347 cows) increased the proportion of nonpregnant cows returning to estrus before pregnancy diagnosis on day 32 by 7.4 percentage points, increased the synchrony of their return by 24.4 percentage points, but delayed that return by 2.3 days compared with controls. In experiment 2 (n = 863 …
Complete Luteolysis And Pregnancy Per Insemination After Modifying The Standard 7-Day Ovsynch Program In Dairy Cows, J. S. Stevenson, B. Atanasov
Complete Luteolysis And Pregnancy Per Insemination After Modifying The Standard 7-Day Ovsynch Program In Dairy Cows, J. S. Stevenson, B. Atanasov
Kansas Agricultural Experiment Station Research Reports
Two experiments were conducted with Holstein-Friesian cows in the Republic of North Macedonia and with Holstein cows in Kansas. We hypothesized that a single standard dose of PGF2αinjected on day 8 instead of day 7 in the standard Ovsynch program would increase the proportion of cows with complete luteolysis and increase the synchronization risk compared with control cows receiving a standard dose on day 7. Cows were treated with the standard program (Ov-7x1) or with Ov-8x1 experimental program in experiment 1, using only a single dose of PGF2α. In experiment 2, a third treatment was added …
Disease Prevalence And Its Consequences On Blood Metabolites, Physical Activities, Milk Yield, And Fertility, J. S. Stevenson, S. Banuelos
Disease Prevalence And Its Consequences On Blood Metabolites, Physical Activities, Milk Yield, And Fertility, J. S. Stevenson, S. Banuelos
Kansas Agricultural Experiment Station Research Reports
Health status of 160 lactating cows was monitored by assessing blood metabolites on days 0, 3, 7, and 14 after calving, in addition measures of physical activity during 20 days surrounding parturition. Cows with clinical disease (any with diagnosis of ketosis, metritis, mastitis, respiratory disease, or milk fever during the first 60 days in milk) were compared with outcomes in healthy cows. Expected differences were observed between health status groups for serum concentrations of free fatty acids, beta-hydroxybutyrate, haptoglobin, and calcium, but not for plasma glucose. Daily postpartum rumination and eating times were decreased in diseased cows and they spent …
Effects Of Dietary Supplementation Of Scutellaria Baicalensis Extract During Early Lactation On Milk Production Of Dairy Cattle, K. Olagaray, Michael Brouk, F. Robert, E. Dupuis, B. Bradford
Effects Of Dietary Supplementation Of Scutellaria Baicalensis Extract During Early Lactation On Milk Production Of Dairy Cattle, K. Olagaray, Michael Brouk, F. Robert, E. Dupuis, B. Bradford
Kansas Agricultural Experiment Station Research Reports
Multiparous Holstein cows (n = 122) were used in a randomized block design to determine the effect of short-term and long-term postpartum administration ofScutellaria baicalensisextract (SBE) on 305-day milk yield, 120-day milk component yield, and early lactation milk markers of inflammation and metabolic function. Treatments were (1) control, (2) short-term (5-day) administration of the SBE (SBE5), and (3) longterm (60-day) administration of the SBE (SBE60). Treatments were included in a treatment pellet that was identical to the control pellet in ingredient source and composition except for the extract, and both pellets were provided via an automated milking system. …
Bioavailability Of Ruminally Or Abomasally Infused L-Carnitine In Holstein Heifers, K. Olagaray, C. Armendariz, A. Bellamine, S. Jacobs, E. Titgemeyer, B. Bradford
Bioavailability Of Ruminally Or Abomasally Infused L-Carnitine In Holstein Heifers, K. Olagaray, C. Armendariz, A. Bellamine, S. Jacobs, E. Titgemeyer, B. Bradford
Kansas Agricultural Experiment Station Research Reports
This study evaluated the relative bioavailability of carnitine delivered by different methods in dairy cattle. Four Holstein heifers were used in a split-plot design to compare ruminally or abomasally infused L-carnitine. The study included 2 main-plot periods, with infusion routes allocated in a crossover design. Within main-plot periods, each of 3 subplot periods consisted of 4-d infusions separated with 4-d rest periods. Subplot treatments were infusion of 1, 3, and 6 g L-carnitine daily. Doses were increased within a period to minimize carryover. Treatments were delivered in two 10-h infusions daily. Blood was collected before the start of infusions and …
Bioavailability Of Rumen-Protected Carnitine In Lactating Dairy Cows, K. Olagaray, J. Shaffer, C. Armendariz, A. Bellamine, S. Jacobs, E. Titgemeyer, B. Bradford
Bioavailability Of Rumen-Protected Carnitine In Lactating Dairy Cows, K. Olagaray, J. Shaffer, C. Armendariz, A. Bellamine, S. Jacobs, E. Titgemeyer, B. Bradford
Kansas Agricultural Experiment Station Research Reports
For this study, 56 lactating Holstein cows (143 ± 72 days in milk) were used in a randomized complete block design to evaluate 2 rumen-protected products compared to crystalline carnitine. Treatments were a) control, b) 3 grams/day crystalline L-carnitine (raw), c) 6 grams/day raw, d) 5 grams/day 40COAT (40% coating, 60% L-carnitine), e) 10 grams/day 40COAT, f) 7.5 grams/day 60COAT (60% coating, 40% L-carnitine), and g) 15 grams/day 60COAT. Treatments were top-dressed to diets twice daily. The 14-day experiment included a 6-day baseline-measurement period with the final 2 days used for data and sample collection and an 8-day treatment period …