Segment 1 A field of sheep is seen as a male narrator explains what lamb dysentery is and where in the UK it occurs. A farmer births a lamb and the narrator explains that the newborn lamb picks up bacteria from the soil or its mother. A seriously-ill three-day-old lamb is seen lying on the ground. The lamb's hind quarters are seen, with the effects of dysentery (diarrhoea and blood) shown. A dead lamb is seen lying in a field; a farmer picks up it by its legs. It is cut open (this is briefly shown) and its intestines are placed in a jar and sent to a laboratory. At the lab, the intestines are emptied onto a tray and a sample taken. This is put into an artificial culture medium and incubated. A drop of this is seen under a microscope. An animation of the bacteria developing into spores is seen. The farm is seen again; the narrator describes the way in which disease is spread - via carrion animals such as crows and foxes, and on animals' feet. Preventative methods are seen; the first is injecting ewes with vaccine. The second is injected newborn lambs with serum. The narrator explains the benefits of vaccination. Time start: 00:00:00:00 Time end: 00:06:56:06 Length: 00:06:56:06