Hi Vishnu,

Since you're doing a B. Tech in Dairy Technology, assuming you've interests in the course, it will be advisable to do an M. Tech in the same domain.

This is because any branch you choose, if you come under the top 5 percentiles and if you have a real passion for the subject, sooner or later you'll have great package at hand, however the reverse is not true always.

Now, if you're someone who is not very much into Dairy Tech and is okay to switch branches, then Food Tech will be a better option as number of jobs available is lot more and also the placements are better.

Work on your priorities and choose wisely.

Hope this was helpful.