Same thing in Britain. The story here is that it's a lack of workers as a result of Brexit...I have my doubts.
That's not really true though, because it's women who are fertility bottlenecks, not men. You can decimate the male population but as long as there's a few left the next generation will be about the same numerically.
The difference is culturally. In Britain the aftermath of WW2 saw an increase in single-motherhood and that led to a huge change in societal behaviour. Lack of father figures played its part in the "sexual revolution" - aka societal degeneracy that occurred as that fatherless generation grew up.
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Bulls and cows have 4 "stomachs". The first break down the grass they eat into food for the micro-organisms contained in another stomach to eat, grow and thrive on. The fourth stomach kills those microorganisms, the remnants of which functions as the sustenance for cows. Put another way: cows are 100% carnivorous... the human digestive tract is completely different.