Feed for preventing and/or treating diseases caused by clostridium bacterium in livestock, and agent against clostridium

1. A method of treating livestock suffering a disease caused by a Clostridium perfringens bacterium, comprising

administering, to the livestock suffering the disease caused by the Clostridium perfringens bacterium, an amount of a controlling agent effective to control and/or inhibit growth of the Clostridium perfringens bacterium in the livestock and thereby treating the disease,

wherein the controlling agent comprises at least one of a cashew nut shell liquid and a heat-treated cashew nut shell liquid,

wherein the livestock are in need of treatment for the disease which is caused by the Clostridium perfringens bacterium, and

wherein the administering includes feeding the livestock a feed comprising the controlling agent.

2. The method of claim 1 , wherein the controlling agent comprises at least one of anacardic acid and cardanol.

3. The method of claim 1 , wherein the livestock is in need of treatment for at least one disease caused by the Clostridium perfringens bacterium selected from the group consisting of necrotic enteritis, enterotoxemia, and malignant edema.

4. The method of claim 1 , wherein the livestock is a fowl.

5. The method of claim 1 , wherein the livestock is a fowl chick.

6. The method of claim 1 , wherein the controlling agent comprises a cashew nut shell liquid containing 55 to 80 mass % of anacardic acid, 5 to 20 mass % of cardanol, and 5 to 30 mass % of cardol.

7. The method of claim 1 , wherein the controlling agent comprises a cashew nut shell liquid containing 0 to 10 mass % of anacardic acid, 55 to 80 mass % of cardanol, and 5 to 30 mass % of cardol.

8. The method of claim 1 , wherein the administering includes feeding the livestock a feed comprising 0.5 mass % of the cashew nut shell liquid or the heat-treated cashew nut shell liquid.

9. The method of claim 1 , wherein said livestock is a cow.

10. The method of claim 1 , wherein said livestock is a chicken.

11. The method of claim 1 , wherein said livestock is a pig.

12. The method of claim 6 , wherein the controlling agent has a minimum inhibitory concentration of 12.5 μg/ml or less according to a standard method authorized by Japanese Society of Chemotherapy (1981).

13. The method of claim 1 , wherein the administering includes feeding the livestock a feed comprising 0.001 mass % to 1.0 mass % of the cashew nut shell liquid or the heat-treated cashew nut shell liquid.

14. The method of claim 6 , wherein said livestock is a cow.

15. The method of claim 6 , wherein said livestock is a chicken.