Is disposing of chickens infected with a virus by leaving them in a distant place in the forest without food or drink, thus leading to their death, considered an unjust act?

These two chickens are property that must not be wasted. If it is possible to benefit from them without harm, the questioner should do so himself, or give them to someone who can benefit from them. If this is not possible, and harm is feared from them, then he should slaughter them to put them out of their misery and dispose of their carcasses in a place where no harm is ensured. Leaving them in the forest exposes them to predation by wild animals, and this is a degradation to them. The answer mentioned some juristic opinions regarding the ruling on a sick animal or one from which no benefit is expected.