Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Using Vaginal Temperature To Evaluate Heat Stress In Dairy Cattle (2005), B. Cvetkovic, John F. Smith, Joseph P. Harner, Michael J. Brouk
Using Vaginal Temperature To Evaluate Heat Stress In Dairy Cattle (2005), B. Cvetkovic, John F. Smith, Joseph P. Harner, Michael J. Brouk
Kansas Agricultural Experiment Station Research Reports
A rise in body temperature is a signal that heat stress has exceeded the heat-exchange capacity of the dairy cow. Previous studies have shown a strong positive correlation between vaginal temperature and respiration rate, demonstrating a stress response to an increased body temperature. Vaginal temperature was collected by using temperature probes attached to an external data logger. Although these devices were very sensitive to changes in body temperature of cows housed in tie-stalls, the external data logger presented a significant application challenge for freeranging animals housed in freestalls. A data logger was acquired that would be completely indwelling in the …
Serological Responses In Dairy Calves To Various Vaccines Administered Via Needle-Free Or Conventional Needle-Based Injections (2005), Larry C. Hollis, John F. Smith, B.J Johnson, Sanjay Kapil
Serological Responses In Dairy Calves To Various Vaccines Administered Via Needle-Free Or Conventional Needle-Based Injections (2005), Larry C. Hollis, John F. Smith, B.J Johnson, Sanjay Kapil
Kansas Agricultural Experiment Station Research Reports
One hundred and four, 5- to 10-month-old Holstein heifers and steers were blocked by age within gender and randomly assigned to treatments. Calves were vaccinated with 5- way modified-live respiratory viral vaccine, Mannheimia hemolytic bacterin/toxoid, and 5- way Leptospira bacterin, administered via either needle-free or conventional needle-andsyringe injection techniques. Blood samples were collected from all calves at the time of vaccination and 21 days later. Blood sera were analyzed for antibody titers to infectious bovine rhinotracheitis (IBR) virus as the indicator of serological response to the 5-way viral vaccine, to Leptospira pomona (LP) as the indicator of serological response to …
Impact Of Frequency Of Feedline Soaking Combined With Evaporative Air Cooling In A Humid Environment (2005), John F. Smith, D.V. Armstrong, M. J. Vanbaale, D.R. Bray
Impact Of Frequency Of Feedline Soaking Combined With Evaporative Air Cooling In A Humid Environment (2005), John F. Smith, D.V. Armstrong, M. J. Vanbaale, D.R. Bray
Kansas Agricultural Experiment Station Research Reports
Heat stress in hot and humid environments reduces milk production, decreases reproduction, and increases health-related problems. The summertime environment in north-central Florida is especially difficult because the combination of high relative humidity and high temperature results in a temperaturehumidity index (THI) above the critical value of 72 for significant portions of the day. Previous work at Kansas State University had shown that the combination of soaking and evaporative air cooling could effectively cool heat-stressed cattle. Effectiveness of this feedline soaking, either in the afternoon and at night, or only at night, in combination with evaporative cooling was evaluated on a …
Update On Ovulation-Control Programs For Artificial Insemination Of Lactating Dairy Cows (2005), Jeffrey S. Stevenson
Update On Ovulation-Control Programs For Artificial Insemination Of Lactating Dairy Cows (2005), Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Use of timed AI programs has become commonplace on most dairy farms either because cows are not watched sufficiently to detect estrus, or because expression of estrus is limited by confinement housing. A number of programs are available to set up firstpostpartum inseminations that include some timed AI or timed AI of all cows once the end of voluntary waiting period (VWP) is reached. One approach may include a period of heat detection and AI until, for example, 100 days in milk, when a timed AI protocol is applied to all previously non-inseminated cows. Another approach includes injections of prostaglandin …
Kansas Farm Management Association Enterprise Analysis: Examining Differences Among High-, Medium-, And Low-Profit Dairy Operations (2005), Kevin C. Dhuyvetter, Terry L. Kastens
Kansas Farm Management Association Enterprise Analysis: Examining Differences Among High-, Medium-, And Low-Profit Dairy Operations (2005), Kevin C. Dhuyvetter, Terry L. Kastens
Kansas Agricultural Experiment Station Research Reports
Thirty-one dairy producers participated in the Kansas Farm Management Association (KFMA) dairy enterprise analysis each year from 2002 to 2004. The dairy farms were sorted based on 3-year average returns over total costs and were categorized as high-, medium-, and low-profit farms. The highestprofit farms earned an average of $795 more per cow ($4.20 per cwt of milk) than the lowprofit farms earned. High-profit farms averaged $521 more milk sales per cow than lowprofit farms did. This difference in profitability was due entirely to greater milk production, inasmuch as milk prices among profit groups did not differ from each other. …