Ata (may Allah have mercy on him) says: If the muhrim kills a one-eyed or defective animal of game, its ransom may also be given with a one-eyed or defective animal, though a complete ransom is dearer to me. And if he kills the small young of game, a small young goat is to be given for it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9892