"When lambs are born in due season, or what we call _chordi_ (that is to say those lambs which are born late and have remained beyond their season in the belly of the dam, the name _chordi_, being derived from [Greek: chorion] the Greek name for the membrane which is called the after birth), care must be taken to clean them and set them gently on their feet and to prevent the dam from crushing them. "On the third consideration with respect to raising young animals, you must consider for how long they should be permitted to suck the dam and when and where, and if the mother has an insufficient supply of milk, how you may put the young one to nurse at the udder of another: in which case they are called _subrumi_, that is to say, under the udder, for I think that rumis is an old word for udder. "Lambs are weaned usually at the end of four months, kids in three, pigs in two. Weanling pigs, from the fact that they are considered fit to be offered for sacrifice at that age, were formerly called _sacres_ as Plautus calls them when he says, "What's the price of sacred pigs?"[115] In like manner stall fed cattle, which are being fattened for the public sacrifices, are called _opimi_. "The fourth consideration relates to the health of the cattle, a subject as important as it is complex, for a single beast which may be sick or infected and ailing often brings a great calamity on an entire herd. There are two degrees of the healing art, one which requires consultation with a surgeon, as for men: the other which the skilful shepherd can himself practise, and this consists of three parts, namely: the consideration of what are the causes, the symptoms and the treatment which should be followed in relation to each malady. The common causes of disease in cattle are excess of heat or of cold, overwork, or its opposite lack of exercise, or, if when they have been worked, you give them food and drink at once without an interval of rest. The symptoms of fever due to heat or overwork are a gaping mouth, heavy humid breath and a burning body. The cure when such is the malady is this: bathe the animal with water, rub it with a warm mixture of oil and wine, put it on a nourishing diet, blanket it as protection against chills and give it tepid water when it is thirsty.[116] If this treatment does not suffice, let the blood, chiefly from the head. "So there are different causes and different symptoms of the maladies peculiar to each kind of cattle, and the flock master should have them all written down. "It remains to speak of the ninth head (c), which I mentioned, and this relates to the number of cattle to be kept and so concerns both of the other heads.