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WEEK: 4 DATE: …………………………
SUBJECT: AGRICULTURAL SCIENCE
CLASS: SS 3
TOPIC: ANIMAL IMPROVEMENT
CONTENT:
SUB TOPIC: Meaning, Aims and Methods of Animal Improvement
Animal improvement is the process whereby inherited superior traits are transferred from one animal to the other of the same species. Certain characteristics such as good feeding conversion, growth rate, meat quality, high milk yield, good body form etc are major consideration in animal improvement.
AIMS OF ANIMAL IMPROVEMENT
METHODS/PROCESS OF ANIMAL IMPROVEMENT
INTRODUCTION: This is bringing animals which are not native of a place but are known to have certain desirable characters into a new place from the place of origin. Such animals are called exotic. Introduction can be by physical importation either of the animals themselves or their semen.
ADVANTAGES
DISADVANTAGES
SELECTION: This is the method whereby a preferred animal is chosen from the population for breeding based on physical features such as growth rate, color, size, resistant to disease and pest, fertility rate, milk quantity and quality etc
TYPES OF SELECTION
(i) NATURAL SELECTION: It operates on the basis of choosing individuals which are able to withstand the unfavorable environmental forces.
(ii) ARTIFICIAL SELECTION: involves man’s ability to discern by observing differences in the animals available and to pick the desirable ones. Under artificial selection, we have
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