a) (i) Describe the life cycle of louse. (ii) State three effects of louse on its host. (iii) State three ways in which louse could be controlled. (iv) Name three farm animals that could be infested by louse.
b) Discuss coccidiosis in farm animals under the following headings: (i) two animals mostly affected; (ii) causal agent; (iii) two symptoms; (iv) two control measures
Explanation
(a) Description of life cycle of louse;
Eggs are laid on the surface of the body of the host Eggs hatch into nymphs Nymphs moult Moulted nymphs become adult Adults live on the surface of the body of the host
(ii) Effects of louse on its host;
Bites cause skin irritation/restlessness/discomfort Sores on skin may result in secondary infection Results in low productivity Transmits diseases e.g. Typhus, trench fever Causes anaemia Emaciation/loss of weight Death/coma
(iii) Ways of controlling louse;
Regular cleaning of animal pens/good sanitation Avoidance of overcrowding of animalsDipping animals in insecticide solution Dusting of birds with appropriate chemicals Drenching with appropriate chemicals Quarantine new birds Ethno veterinary practices Use of injectable - Vaccination/immunization
Blood stained diarrhoea Loss of appetite/anorexia Loss of weight /emaciation Low productivity Loss of hair/alopecia in rabbits Anaemia Death Sluggishness Droopy wings in poultry/rough feathers
(iii) Control measures
Regular changing of litter Proper sanitation measures Vaccination Fumigation Use of coccidiostat in feed/water Burying/burning/incinerating dead animals
