Beast Qi had profound effects on beasts, and Lin Mu had used it several times.
With how extensively he had fed Little Shrubby and the twins, the changes and their strength were quite apparent.
Lin Mu also continued to feed them the Beast Qi from time to time, which didn't have as much effect on them now but there were still some long term benefits.
He reckoned since there was no harm in doing that, he could simply continue to do so. He also hoped that there would be a transformation effect eventually once a large enough amount of Beast Qi was consumed.
Or that the beasts needed to reach a certain level for the Beast Qi to have any more effects.
Lin Mu had tested this out in the past with Little Shrubby, and knew that they couldn't strengthen anymore of his bloodlines. They simply did not respond to it, as if they had reached a state of saturation.