Most milk cow species, vs. beef species, are more 'slabsided' and thinner looking. They do not have the muscle mass than the breeds used for beef, and they are 'hippier' than beef breeds. But a bovine is a bovine, and there is a point when they are too thin. Also, the constant bawling (unless it's weaning time of calves) means they are either hungry or thirsty- or both.