Guest Instructor: Gary Oetzel, DVM.
At the end of this laboratory students will be able to
- To understand the use of urine pH test in conjunction with anionic salts in pre-calving diets and prevention of hypocalcemia;
- To recognize the “steps” of a normal calving and how to use calving aid;
- To understand basic concepts related to the metabolism of ketones in early lactating cows;
- To perform a milk, blood, and urine ketone test and how to interpret results;
- To understand the difference between specificity and sensitivity of a test.
Thought-Provoking questions to think about before the lab:
- What is the most common mistake still made on many farms in assisting cow’s calving?
- Why are early lactation cows likely to develop subclinical ketosis?
- Explain in your own words the concept of “cut-point” and the “alarm level” used by Dr. Oetzel in clinical herd evaluation.
- What is the difference between the sensitivity and the specificity of a test? Why does it matter?
- Prior to 2:25: If possible, please come early to weight your cow as the lab begins;
- 2:35 - 3:10: Assisted calving (video) | Discussion of the video;
- 3:10 - 3:35: Blog entries Q&A; Biological Testing for Ketosis and dry cow urine pH for dry cow response to anionic salts;
- 3:30 – 4:00: Move to barn's west side where Dr. Oetzel will demonstrate, and students will practice, the following:
- 4:00 - 4:20 Urine collection and pH measurement followed by tetostick test;
- 4:20 - 4:40: Milk collection (using CMT paddle) and milk ketone powder test;
- 4:40 - 5:00: Blood collection and digital keto-meter test;
- 5:00 - 5:25: Discussion of results from various test | test specificity versus test sensitivity.