Blood samples obtained from calves is a common procedure that can be very useful for a variety of reasons including testing for disease and determining the transfer of passive immunity. The quick and relatively simple method of taking blood samples can be low-stress and painless for both the animal and the individual. However, knowing where and how to place the need quickly to get a sample is important.


![Understanding the carryover effects of early life heat stress on dairy calves [Video] ▶️](https://dairy.extension.wisc.edu/files/2024/06/Badger-Dairy-Insight-Feature-Card-Dr-Jimena-Laporta-440x275.jpg)