Today is only Friday, I just now saw the post under new threads. We have been in the hayfield for the last several days as the weather has been perfect and I have also fit in a couple of times at my job as milk tester. And as
@Mini Horses stated, I have a garden and we are about done calving out our spring group of cows and trying to get fences repaired from all the trees down this winter, and get cows moved out to summer pasture. There are not alot of cattle people on this site except for a few with family cows for milk and an occasional beef for the freezer.
Tylan would not be my 1st choice for a snotty nose. And no, most cattle will not eat feed if it tastes too much like medicine. Tylan can be used in water if it is on the particular label to do so. They use it in poultry water occasionally.
Has the calf had any shots or vaccines? Has it been exposed to any other newly acquired animals? How has your weather been? Extreme temperature changes? Where are you located (general area like state or something)? Is he running a temperature? Eating normally? Coughing or any breathing distress?
One thing, to give advice or make any suggestions, on something on such a general description is not wise.
Also, one thing to consider... If you have a relationship with a vet, because after the 10th of June there will be no antibiotics available without a vet prescription and if you do not have a relationship with a vet ( some routine vet work done) they will not prescribe without seeing the animal for each problem. This has been coming for several years and been set in place in stages. Just a heads up for your information.