the colour of the milk has become yellowish and the other is swollen

This is clinical mastitis. First, do not mix this yellowish milk with normal milk, and do not sell it. Wash the udder and teat with clean water, dry with a clean cloth, and milk out the swollen quarter fully into a separate vessel. Do this gently three to four times in a day so pressure reduces. Apply warm cloth fomentation on the swollen part for ten to fifteen minutes before milking. Keep her standing area dry and clean, and remove wet dung or mud bedding. Your vet will need to check the quarter and prescribe the right antibiotic treatment after examination, because wrong medicine can spoil milk safety and may damage the udder. If she has fever, stops eating, the swelling becomes hot and painful, or milk has clots or blood, book a Pashu Vet on Pashushala today or call one nine six two. Untreated clinical mastitis can make the quarter dry permanently and cause rupees thirty thousand to rupees sixty thousand loss in one lactation. Consult a veterinarian before administering any medicine or treatment.