Description: Segment 1 The narrator explains how good animal husbandry can protect a flock of sheep against many things. Grazing sheep on a farm are shown. A list of diseases caused by germs of the clostridia family is shown (blackleg, black disease, braxy, tetanus, lamb dystentery, struck and pulpy kidney). The types of bacteria that cause each disease are listed onscreen, and a map is used to show the localities in the United Kingdom that the diseases occur in. Sheep are shown grazing again, and the narrator explains that the clostridia bacteria live in the soil and when ingested by sheep can produce poisonous toxins. The only safeguard is immunisation. Illustrations are used to show how the toxins spread throughout a sheep's body. Sheep are shown being injected with a vaccine. A review of the basic principles of immunisation is given, using illustrations. The differences between an antiserum and a vaccine are described using charts and graphs. Sheep are shown having their tails docks, and lambs are shown being vaccinated. Illustrations are used to show how natural passive immunity (passed on from a mother to a lamb) is passed on. Illustrations show how the vaccines affect the sheeps' bodies. Time start: 00:00:00:00 Time end: 00:07:59:17 Length: 00:07:59:17 Segment 2 The use of the drug Covexin is described as an example of immunisation against sheep clostridial diseases. The timings of the vaccine and the booster injections are described using a flowchart. The Covexin system is one vaccine that protects against eight diseases. The benefits of this are discussed. A ewe is seen giving birth, and natural passive immunity is described. An orphan lamb is shown being bottle fed. Sheep are seen being injected with vaccine. The narrator stresses that the cost of the vaccine is low compared to the loss of sheep to disease. The best times to vaccinate ewes and lambs are discussed, and a flock of sheep is shown being vaccinated. Time start: 00:07:59:17 Time end: 00:15:44:24 Length: 00:07:44:07