Hello everyone, the next update is here, bringing a new upgrade option and ALL animal save issues fixed for good!
List of changes for this patch:
Cow Barn: Milking Machine
Quite self-explanatory, this upgrade automates the cow milking process and stores the collected milk in the Bucket inside the barn. All you have to do is take it! 
Fixes & Improvements
Save issues for the rest of farm animals have been fixed; Each save/load logic was rebuilt and no longer causes animals to disappear or not spawn on load.
Improved Rooster and Baby Chick logic.
Cow Barn menu small logic issues fixed.
Further overall optimizations made for better performance and stability.
That is all for this one, finally finished with the save issues regarding animals; The new system CAN NOT miss a thing.
Thank you all again for playing and see you later with the next update as usual :)