When the thermostat spikes, and temperature stress is high on the herd, what lasting effects are made? A data set that began several years back continues to grow in strength suggesting that summer calving harms in irreversible ways. This paper specifically focuses in on the calf developing in utero, incubated like a crock pot inside the dry cow.
Maverick Guenther, conducted a studied with the oversight of Dr. Laporta in WI to specifically measure the impact of in-utero heat stress conditions on colostrum absorption to help explain the decreased calf performance parameters previously seen and ultimate reduction in milk production years later.
Listen in today to learn how colostrum absorption is impacted and possible ways to improve the situation.
Topics of discussion
1:40 Introduction of Maverick Guenther
3:42 Experimental design; calves heat stressed
4:43 Background IgG transfer from dam into offspring– Apparent Efficiency of Absorption (AEA)
8:04 Long term effects of heat stress
10:41 Microscopic observations of intestinal lining in addition to cellular death measurements
12:01 Acceleration of gut closure might be due to Cellular death
12:58 Does heat stress impact colostrum?
14:38 A second meal of colostrum might help
15:47 Changes in gene expression
16:46 Deeper explanation of “FC receptor” changed due to HS in utero
18:39 What is the source of the FC receptor
20:24 What does colostrum absorption look like for mild heat stress and primiparous animals
22:38 What are research next steps – rescue feeding vs prevention
23:14 Stress response, such as SCC impact on colostrum absorption
25:10 What do you want boots on the ground dairymen to know from your research?
26:19 Ideal colostrum brix reading
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