It beggars belief. Just why? Even "if" you were off the mindset that women are chattal and only good for bearing strong male fighters, you'd want to make sure your "herd" doesn't die during its task, right?
This is just wanton cruelty. Can't even call it "bronze age thinking", because the greeks, Romans, Hebrews, Assyrians, Babylonians all knew better than this.
What's the outcome? More women die in childbirth and complications. So the demographic will skew towards a male heavy country. Always gone well that, men sat around in poverty, no family to look after, just guns and Islam to occupy their time..