Agricultural Science English Paper 1 2015 Questions and Answers Part 1

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Section B

Question 2

Animal Nutrition

Alimentary Canals of Two Farm Animals

Type of digestive systems represented by:

  • Ruminant
  • Cattle/cows/sheep/goat/game
  • Non-ruminant/monogastric animal
  • Pig

Letter and name where hydrochloric acid is secreted in diagram A:

  • D
  • Abomasum/true stomach/milk stomach

Planning Fodder Flow Feed Flow and Fodder Flow Production

Definition of fodder flow:

  • A strategic plan
  • To ensure enough fodder
  • To meet the requirements of all the animals
  • Throughout the year
  • In terms of quality and quantity (Any 2)

Aspects in planning for a fodder flow:

  • Economic viability: The farmer to take measures of ensuring that the fodder is cost effective/cheap
  • Sustainability: Planning to ensure that the fodder is always available to livestock

Digestibility Co-Efficiency

Calculation of digestibility co-efficiency:


or %

Implication of the Answer in Question

The bulk of the feed (62,35 %) is digested and absorbed by the heifer


The lesser percentage of the feed (37,65 %) was not digested hence not absorbed by the heifer

A Table on the Nutritive Ratio (NR)

The ration most suitable for the following:

  • Fattening of old ewes – A
  • Ewes in the last 4 weeks of pregnancy – B
  • Young growing animals – B

Reason for the ration in 2.4.1 (a) :

  • Ratio is wide
  • Feed has higher lipid/carbohydrate/energy content
  • Feed has lower protein content
  • Ewes need more energy than protein (Any 1)

Ration with high levels of:

  • Maize – A
  • Fish meal – B

The implication of the nutritive ratio of ration B:

  • Ration has higher protein content
  • Recommended for growth, production, and reproduction
  • Ration has lower lipid/carbohydrate/energy content (Any 2)

Diagram on Mineral Supplements

Method of mineral supplement:

Mineral lick

Two minerals that could be supplemented:

  • Calcium
  • Sodium
  • Phosphorus
  • Nitrogen (Any 2)

The partial protein substitute:

Non-protein nitrogenous substance (NPN) /biuret/urea

Role of growth regulators:

  • Hormones – will stimulate metabolic reactions that will lead in increased growth rate
  • Antibiotics – will provide immunity thereby increasing resistance to diseases

Question 3

Animal Production, Protection and Control

Animal Production Systems

Identification of animal production systems:

  • A: Extensive production system
  • B: Intensive production system

Comparison of the Two production systems:

  • Capital investment – Low capital/technology input in extensive production system and large capital/technology input in intensive production system
  • Area/space of land occupied – Low animal concentration in a large area in extensive production system and high animal concentration in a small area in intensive production system

Two examples of intensive production system:

  • Cage
  • Battery (layers/broilers)
  • Deep litter system (Any 2)

Structures/Practices for Handling Animals

  • A single strand of movable electrical wire
  • A rope with a halter to tie animals to a pole
  • A separate crush
  • Single strand of movable electric wire

Scenario on Solar Radiation

Three measures to reduce heat stress under intensive conditions:

  • Spray/Fugger with water
  • Insulation
  • Fans/conditioners/ventilators
  • Housing systems/orientation (Any 3)

Correlation between high environmental temperature and feed consumption:

  • The higher the temperature
  • the less the feed intake

Data on Average Body Temperature and Pulse Rate in Dairy Cows

Line graph on the volume of stimulant and the growth response:

The Line Graph

Line graph of growth stimulants against growth response Criteria/marking guidelines:

  • Correct heading
  • Y-axis – correct labelling (growth response)
  • X-axis – correct labelling (volume of growth stimulants)
  • Correct units
  • Accuracy/correct plotting
  • Line graph