The authorities in the Indian capital Delhi have turned to microchips to tackle the growing problem of stray cows roaming the streets.
Delhi has about 40,000 cows roaming the streets
A court had earlier ordered authorities in south Delhi to offer a reward of $45 to anyone delivering a stray cow.
The authorities then sell the cow to a new owner but they are concerned people might take advantage by bringing back the same cow for the reward.
A $11 microchip in the cow's gut will now show a cow already brought in.
Commissioner of the local municipal corporation, Rakesh Mehta, said the chips would allow resident welfare associations to determine whether the cow brought to the local authorities was a stray one or not.
"Otherwise, people can sell their own cows for quick money," he said.
Following the earlier Delhi High Court order, a number of cows and buffaloes have been brought to the authorities by people eager to receive rewards.
Cows are revered as sacred among Hindus and are protected by law.
There are nearly 40,000 thought to be roaming the streets of the Indian capital.
Officials say unauthorised dairy farms are one of the main causes.
They say stray cows pose a serious traffic hazard.
This week a woman broke her arm after a cow being chased by residents slammed into her.