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Articles 1 - 11 of 11
Full-Text Articles in Life Sciences
Deliberate Exercise Of Pregnant Holstein Heifers Improves Milk Composition During Lactation, J. Johnson, P. Steichen, B. J. Bradford, A. E. Rhodes, T. G. Rozell
Deliberate Exercise Of Pregnant Holstein Heifers Improves Milk Composition During Lactation, J. Johnson, P. Steichen, B. J. Bradford, A. E. Rhodes, T. G. Rozell
Kansas Agricultural Experiment Station Research Reports
Exercise has substantial impacts on systemic physiology, but little research has been conducted to assess how it may influence dairy cattle in modern confined production systems. Dairy heifers were walked for up to 45 minutes, 4 days per week for 8 weeks during pregnancy to assess impacts on subsequent health and productivity. Heifers that were exercised had increased milk protein and solids-not-fat concentrations for up to 15 weeks into lactation, and increased milk fat and energy-corrected milk production at some time points during this period, as compared to sedentary contemporaries. No adverse or beneficial effects of exercise were found on …
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 A High-Protein Corn Product On Nutrient Digestibility And Production Responses In Mid-Lactation Dairy Cows, W. E. Brown, B. J. Bradford
Effects Of A High-Protein Corn Product On Nutrient Digestibility And Production Responses In Mid-Lactation Dairy Cows, W. E. Brown, B. J. Bradford
Kansas Agricultural Experiment Station Research Reports
An experiment was conducted to assess the effects of a high-protein corn product (56% crude protein; CP) relative to other sources of protein on the lactation performance of dairy cows. Twenty-four Holstein cows (1,367 ± 105 lb of body weight, 111 ± 34 days in milk, 2.28 ± 0.46 lactations; mean ± standard deviation) were randomly assigned to treatment sequence in a replicated 4 × 4 Latin square design balanced for carryover effects. Cows were individually fed one of four diets with a different protein concentrate source during each 28-day period, including: soybean meal (SBM), high-protein corn product (HPCP), soybean …
Dairy Research 2019, B. J. Bradford
Dairy Research 2019, B. J. Bradford
Kansas Agricultural Experiment Station Research Reports
Kansas State University is pleased to present the 2019 Dairy Research Report of Progress and proud to serve the growing Kansas dairy industry.
Are My Dry Cows Heat-Stressed? A Novel Approach To Assess Heat Stress Of Dry Cows In Commercial Dairy Herds, A. L. Scanavez, C. A. Gamarra, R. S. De Oliveira, L. G. Mendonça
Are My Dry Cows Heat-Stressed? A Novel Approach To Assess Heat Stress Of Dry Cows In Commercial Dairy Herds, A. L. Scanavez, C. A. Gamarra, R. S. De Oliveira, L. G. Mendonça
Kansas Agricultural Experiment Station Research Reports
Heat stress during the dry period causes major economic losses to the dairy industry. However, limited research exists regarding responses of dry cows exposed to various temperature and relative humidity gradients. In addition, no validated methods are currently available to assess heat stress in dry cows. The goals of this study were to describe core body temperature (CBT) responses of dry cows according to a variety of temperature-humidity index (THI) values, and develop and validate a practical method to assess heat stress in dry cows in commercial dairy herds. This study was comprised of 2 parts. In the first part …
Combined Risk Factors And Digestive Disorders In Mid-Lactation Holstein Cows: A Case Study, S. T. Quanz, L. K. Mamedova, M. J. Brouk, P. Gott, B. J. Bradford
Combined Risk Factors And Digestive Disorders In Mid-Lactation Holstein Cows: A Case Study, S. T. Quanz, L. K. Mamedova, M. J. Brouk, P. Gott, B. J. Bradford
Kansas Agricultural Experiment Station Research Reports
Digestive disorders can be a significant cause of disease on dairies and are frustrating because of their unpredictability. Diets that may support excellent health in most cases may nonetheless result in significant gastrointestinal disease, even leading to deadly conditions such as hemorrhagic bowel syndrome. To our knowledge, there is limited research on these conditions, as many risk factors fail to reproduce disease when experimentally administered to cows, leading many to conclude that these disorders are generally multifactorial in nature and difficult to replicate. In this case study, we document the outbreak and resolution of digestive disorders among 15 control cows …
Does Time Interval From Thawing Multiple Straws Of Semen To Insemination Affect Pregnancy Outcome Of Lactating Dairy Cows?, J. Fehn, L. G. Mendonça
Does Time Interval From Thawing Multiple Straws Of Semen To Insemination Affect Pregnancy Outcome Of Lactating Dairy Cows?, J. Fehn, L. G. Mendonça
Kansas Agricultural Experiment Station Research Reports
Technicians must follow guidelines when inseminating cows to avoid impacting the quality of semen and pregnancy per AI (P/AI). The interval from initiation of the thawing process of multiple semen straws until AI is an important aspect to be considered when evaluating the performance of AI technicians. Time interval from thawing to AI can be affected by the skill level of the AI technician, distance from the thawing unit to location of insemination, and labor efficiency. Because modern dairy farms are becoming larger, it is important to evaluate if the interval from thawing to AI is impacting P/AI in large …
Effects Of Two Commercial Supplemental Fat Products On Body Condition Score And Cow- And Herd-Level Milk Yield And Composition In A Commercial Dairy Herd In Kansas, A. L. Scanavez, C. A. Gamarra, R. S. De Oliveira, L. G. Mendonça
Effects Of Two Commercial Supplemental Fat Products On Body Condition Score And Cow- And Herd-Level Milk Yield And Composition In A Commercial Dairy Herd In Kansas, A. L. Scanavez, C. A. Gamarra, R. S. De Oliveira, L. G. Mendonça
Kansas Agricultural Experiment Station Research Reports
Feeding fat supplements to lactating dairy cows is an effective strategy to increase energy density of rations and increase milk yield. However, it is not clear whether supplementing a specific fat supplement for the entire lactating herd provides better results than others in commercial dairy herds. The objective of this study was to compare the effects of fat supplementation with two commercial products on changes in body condition score (BCS) and cow- and herd-level milk production and composition in a large commercial dairy herd. The study was conducted in a herd milking approximately 1,500 Holstein cows. One of two treatments …
Identifying A Milk-Replacer And Weaning Strategy For Holstein Calves Using Automated Behavioral Measures Of Lying And Environmental Enrichment Device Use, E. M. Bortoluzzi, T. M. Hill, L. L. Deikun, L. A. Ruiz, M. J. Goering, T. S. Dennis, F. X. Suarez-Mena, J. D. Quigley, R. L. Schlotterbeck, M. V. Alonso, R. Mazloom, M. Jaberi-Douraki, L. E. Hulbert
Identifying A Milk-Replacer And Weaning Strategy For Holstein Calves Using Automated Behavioral Measures Of Lying And Environmental Enrichment Device Use, E. M. Bortoluzzi, T. M. Hill, L. L. Deikun, L. A. Ruiz, M. J. Goering, T. S. Dennis, F. X. Suarez-Mena, J. D. Quigley, R. L. Schlotterbeck, M. V. Alonso, R. Mazloom, M. Jaberi-Douraki, L. E. Hulbert
Kansas Agricultural Experiment Station Research Reports
In dairy production, “weaning readiness” is often based on solid feed intake. The goal of this study was to determine weaning readiness using feed-intake, lying-behaviors, and the use of an environmental enrichment device (EED) in calves that underwent 1 of 4 milk-replacer and weaning protocols. Twenty-eight male Holstein calves (95 ± 2.6 lb BW at 1 d of age) were housed in individual pens and initially fed one type of milk replacer (25% crude protein (CP), 17% fat, 1.45 lb of dry matter (DM)) via nipplebuckets twice a day (AM and PM), and one type of textured calf starter ( …
Individual Feed Intake Of Transition Cows And Their Daily Activity Measures Of Temperature, Eating, Rumination, Resting, And Activity Times, J. S. Stevenson, C. S. Takiya, B. J. Bradford
Individual Feed Intake Of Transition Cows And Their Daily Activity Measures Of Temperature, Eating, Rumination, Resting, And Activity Times, J. S. Stevenson, C. S. Takiya, B. J. Bradford
Kansas Agricultural Experiment Station Research Reports
Fifteen transition dairy cows bearing CowSensor®ear tags were monitored during 14 days before and after calving to assess temperature and behavior outcomes recorded by the sensors, in addition to actual individual dry matter and as-fed feed intake. The sensors—compared with reported visual observation studies—underestimated eating and resting times, but rumination time was estimated reasonably accurately. Expected changes in rumination (decreased acutely before calving and increased linearly to day 14) and general activity (increased acutely just before calving) were observed. More studies are warranted to determine how to use these activity monitors in detecting health disorders of cows that …
Beta-Hydroxybutyrate Alters The Mrna Cytokine Profile From Mouse Macrophages Challenged With Streptococcus Uberis, T. H. Swartz, L. K. Mamedova, B. J. Bradford
Beta-Hydroxybutyrate Alters The Mrna Cytokine Profile From Mouse Macrophages Challenged With Streptococcus Uberis, T. H. Swartz, L. K. Mamedova, B. J. Bradford
Kansas Agricultural Experiment Station Research Reports
The objective of this study was to determine if β-hydroxybutyrate (BHB) altered inflammatory responses in macrophages challenged with a common mastitis pathogen,Streptococcus uberis. Mouse macrophages (RAW 264.7 line) were cultured either in the presence or absence of BHB for 24 h, and then challenged or not withS. uberis. Relative transcript abundance of cell membrane receptors (TLR2 and GPR109a), cytokines (IL-1β, IL-10, TNFα, and TGFβ), and chemokines (CXCL2 and CCL5) were determined using quantitative real-time polymerase chain reaction (qPCR) and normalized against the geometric mean of HPRT and B2M.Streptococcus uberisactivated the macrophages, noted by greater …