وَإِنْ كَانَتْ وَاجِبَةً أَقَامَ غَيْرَهَا مَقَامَهَا، وَصَنَعَ بِهَا مَا شَاءَ.
Translation: If it was an obligatory offering, he provides a replacement and may dispose of the original animal.
The duty to offer the compulsory hady survives the animal’s failure.
Once a replacement is due, the original animal has a different disposal rule from the failed voluntary offering described just before.