FROM THE EXTENSION OFFICE: The effects of heat stress on dairy reproduction | Community
OF THE EXTENSION OFFICE
University of Wisconsin-Madison Dodge County Extension Division
In May, I wrote an article titled “Summer is Coming to the Farm, Are You Ready?” during a week of experiencing cold and wet weather unusual for Wisconsin. Wow, what a difference a few weeks can make. Related to the topic of heat reduction on our dairy farms, let’s take a closer look at the effects of heat stress on dairy reproduction and some tips for dealing with it.
In a fact sheet titled “Effects of Heat Stress on Dairy Reproduction,” co-authored by educators in the Division of Extension at the University of Wisconsin-Madison, Heather Schlesser, Ryan Sterry, Amanda Young and specialist Dr. Paul Fricke, we are learning that “heat stress affects not only your livestock’s productive capacity, but also their ability to conceive and maintain a pregnancy.
This information sheet available on https://fyi.extension.wisc.edu/dairy/heat-stress-dairy-production, explains how during times of heat stress, cattle are less likely to move around, so it becomes increasingly important to know all the signs of estrus, increase observation times and use aids detection of estrus to make it reproduce.
To help spot estrus on hot summer days, you can use estrus detection aids, as 70% of standing events occur from 6 p.m. to 6 a.m., the coolest part of the day. day. In addition to the number of permanent events expressed during the summer months decreasing to 50% or less than the number observed during the winter months. Since the majority of standing events occur during the night, it is essential to include aids in the detection of estrus. Traditional aids such as paints and chalks work well when applied to the tail head with pressure activated devices. Estrotect patches can also be used to help detect estrus. Newer technologies such as pedometers, activity monitors, etc. can also be used. These new technologies incorporate computers and are recommended for farmers who are comfortable with the technology. Scheduled artificial insemination may also play a more important role during heat stress to synchronize cows for insemination, although inseminating cows during summer heat stress may reduce conception rates, deciding not to inseminate them. cows is more detrimental by decreasing gestation rates to 21 days and by extending open days. .