Archive for February 2024

By: Dr. Collin Lawrence

Whether you have chosen to rear bottle calves purchased from outside sources or are having to feed orphans or excess twins from your herd, there are some important things to consider.

1) Colostrum is always a number 1 priority. The importance and impacts of getting enough colostrum into a calf are critical. Increased risks of navel infections, scours, pneumonia, as well as reduced growth rates and immunity are only a few of the many impacts in the failure of passive transfer.

Timing is critical to ensure adequate intake of colostrum. It is recommended that calves get a minimum of 100-120 grams of immunoglobins (these are the antibodies calves receive from colostrum) in order to achieve adequate passive transfer. Calves are only able to absorb colostrum in their first 24 hours of life however, only a few hours after birth their absorptive capabilities start to diminish and by 12 hours old they can only absorb 50% of what they are fed. Meaning, even though you may provide great quality colostrum, if you delay giving it, they likely will not get enough antibodies to achieve adequate protection. If you do not see a calf up and nursing within the first 2 hours of life, it is probably prudent to get involved and ensure they get what they need. If you are buying calves and are unsure of their colostrum intake, you may want to reconsider purchasing them.

2) Bedding. A well bedded pen for them is very important and a thick layer of straw that they can snuggle into provides both a warm environment and helps reduce exposure to pathogens, especially if multiple calves are houses together.

3) Preventative measures. We recommend all calves receive Vit AD and Selenium at birth. There are a number of injectable or oral products available. As well, intranasal vaccines are a good idea to reduce the risk of respiratory disease affecting these calves in their first months of life. The use of scour prevention products is a bit more complicated as it depends on what pathogens we are trying to protect against (there is no product that protects against everything) and most have to be given in the first hours of life, like colostrum.

4) Feeding. At a minimum, calves should be getting 10% of their body weight in milk each day (10lbs = 1 gallon = 4.5L). However, to achieve better growth rates and health outcomes, many dairy operations are feeding calves closer to 8-10L of milk per day. They should also have full time access to a dairy calf creep and good quality grass hay by a week old. This is critical for rumen development and allows calves to transition easier during weaning, often within 3 months of life.

Normally calves are continually exposed to lactobacillus and other “good bacteria” when they nurse from their mother’s udder. A bottle calf does not have that luxury and without a normal gut flora they have reduced feed efficiency and increased risk of scours. We also have a product to add to their feedings this twice daily in the milk provides a source of these important bacteria.