Theory question 104
Animal Improvement(a) Explain briefly three systems of mating in livestock management.
(b) Draw and label the digestive tract of a hen.
(c) Give five reasons why ornamental plants are important.
Show the model answer
(a) Any three: inbreeding – mating closely related animals (e.g. brother and sister); line breeding – mating distantly related animals within a line; outbreeding – mating unrelated animals of the same breed; cross breeding – mating animals of different breeds; upgrading – using pure-bred males on local females over generations.
(b) A clear diagram showing and labelling: beak/mouth, oesophagus, crop, proventriculus, gizzard, duodenum (with pancreas), small intestine (ileum), two caeca, large intestine/rectum, cloaca and vent; liver.
(c) Any five: beautify homes, offices and surroundings; provide shade; act as windbreaks/hedges and fences; control erosion; used as gifts and for decoration at ceremonies; source of income; some are medicinal; provide privacy and reduce noise.
Label at least eight parts, including crop, gizzard, caeca and cloaca.