'Flocks' in the Bible

Nathan approached David and said, "There are two men in the city. One is rich and one is poor. The rich man has many flocks and herds,

A traveler arrived to visit the rich man. Because he was unwilling to take an animal from one of his own flocks or herds to prepare for the guest who had come to visit him, he took the poor man's lamb and prepared it for the man who had come to visit him."