Calf Health in the First Weeks: Colostrum and Lab Tests
Short answer
A newborn calf gets its first defence against infection from colostrum, its mother's first milk. A blood test and a colostrum check can show whether enough antibodies were taken in.
For: CowsBuffaloes CalfBuffalo Calf
By Pashupatinath Vet Lab Share
A newborn calf gets its first defence against infection from colostrum, the mother's first milk, so what it drinks in its first hours matters. A blood test on the calf and a check of the colostrum can show whether enough antibodies were taken in, and stool tests help when the calf has scours, which means loose watery motions. Your vet decides which tests fit.
Why does first milk matter so much?
A calf is born with almost no antibodies, the small proteins that recognise and fight germs. They do not cross from the cow to the calf before birth. The calf must take them in from colostrum, which is thick and rich. The same is true for buffalo calves.
The calf's gut can absorb these antibodies only for a short time after birth, and then it stops. So the quality of the colostrum, the amount the calf drinks and how soon it drinks all matter. A calf that gets too little is more likely to fall ill with scours, navel infection or a chest infection in its first weeks.
How can the colostrum itself be checked?
Colostrum differs from one animal to another, and a cow can look healthy while giving thin colostrum. The Colostrum Quality Test (Brix / IgG) checks a small sample of first milk to see how rich it is in antibodies. Some methods use a quick meter reading as an estimate, and others measure IgG, the main antibody, directly. The lab confirms the method when you book.
Collect a small sample in a clean container with a lid, from one animal only, and keep it cool. Do not mix it with milk from other animals. A vet may suggest this check on a farm where several calves have fallen sick early in life.
How does a blood test show whether the calf got enough?
The Calf Passive Transfer Test (Serum IgG / Total Protein) looks at the serum, the clear part of the blood, for IgG or for total protein. Antibodies are proteins, so total protein can serve as a simple guide to how much a calf has taken in. Your vet takes the sample at a suitable time after the calf has fed and will tell you when.
The report shows a reference range. A low result does not mean the calf is sick now. It means the calf is at greater risk, so your vet may watch it more closely or review how colostrum is given on the farm.
When does scours testing help?
Scours has many causes, including viruses, bacteria, parasites and feeding problems. You cannot tell the cause from the look of the dung. A calf with scours can lose body water quickly, so call a vet at once and do not wait for a lab result.
The Calf Diarrhoea RT-PCR Panel uses RT-PCR, a method that looks for the genetic material of germs in a dung sample. A panel like this typically covers several common causes of scours in young calves, and the exact list is confirmed when you book. A negative result does not rule out every cause.
Some germs that cause scours can pass to people. Wash your hands after handling calves and dung samples, wear gloves, and speak to a doctor if you feel unwell.
What does the coccidia count show?
Coccidia are tiny single-celled parasites that live in the gut. They pass oocysts, which are tiny egg-like forms, in the dung. In the Coccidia Oocyst Count (OPG), OPG means oocysts per gram: the lab counts them in a measured amount of dung. Some calves carry coccidia without being ill, so a registered veterinarian reads the count with the calf's signs and the pen conditions.
Some farmers book several calf checks together. The Calf Health Check Pack groups such checks, the exact list is confirmed when you book, and your vet can change it.
Read next
If a calf already has loose motions, Calf Scours: Rapid Kits and RT-PCR Panels compares the quick kits with the panel. To see how a stool sample is prepared and looked at under the microscope, Worm Checks in Puppies: Stool Tests Explained shows the steps in simple words.
Testing in Bhopal
Dairy farms in Bhopal can ask for free sample collection, and the vet usually takes the calf's blood. Keep the colostrum or dung sample cool and call or WhatsApp +91 88175 01118 to book with the lab at C-200, C Sector, Shahpura. The lab confirms the method, sample needs and reporting time when you book. Farms in other districts can send samples by courier or bus parcel, or hand them to the local vet.
This article is general information and does not replace a veterinarian’s advice. Please talk to a registered veterinarian about your animal’s signs, tests and treatment.