I'm not sure, but I know that animal chips usually run at low frequencies compared to iPhone NFC. If the iPhone can send/read at that frequency, you'll probably need the chip maker's app, because the temperature parameter probably isn't standardized and likely follows a protocol made by the manufacturer. If you know the chip maker, it's easier to check if you can read it with an iPhone app.
I'm not sure, but I know that animal chips usually run at low frequencies compared to iPhone NFC. If the iPhone can send/read at that frequency, you'll probably need the chip maker's app, because the temperature parameter probably isn't standardized and likely follows a protocol made by the manufacturer. If you know the chip maker, it's easier to check if you can read it with an iPhone app.