twenty.

Genesis 31:41
Thus for twenty years I have served in your household--fourteen years for your two daughters and six years for your flocks--and you have changed my wages ten times!

ewes.

Genesis 30:27, 30
But Laban replied, "If I have found favor in your eyes, please stay. I have learned by divination that the LORD has blessed me because of you." . . .

Exodus 23:26
No woman in your land will miscarry or be barren; I will fulfill the number of your days.

Deuteronomy 28:4
The fruit of your womb will be blessed, and the produce of your land, the offspring of your livestock, the calves of your herds, and the lambs of your flocks.

the rams.

Ezekiel 34:2-4
"Son of man, prophesy against the shepherds of Israel. Prophesy and tell them that this is what the Lord GOD says: 'Woe to the shepherds of Israel, who only feed themselves! Should not the shepherds feed their flock? . . .