Motherhood and sacrifice - where to start? Google it for 2.8 million hits and keep on going.
The story of Jesus's sacrifice is known worldwide - yet first Jesus's mother Mary gave of her body to him by breastfeeding. There is an entire genre of art dedicated to this - Maria Lactans.
While we modern mothers sometimes resent the constant sacrifice of our own needs to our babies, mothering instinct is biological and strong. A happy breastfeeding mother and baby dyad is a testament to the future of the human race.
Mammals and our milk
All of us mammals produce milk for their young - it's why we're called mammals.
Mothering young and feeding them is common to humans, cats, dogs, horses, lions, tigers, goats, and of course, cows.
Read the full story about cows as mothers and the dairy industry.