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BGCSE Animal Production 1255 study materials
BGCSE Animal Production 1255 study resources

BGCSE Animal Production 1255 practice questions

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Question 1Animal Anatomy and Physiology

Which organ is the main site of nutrient absorption in a monogastric mammal?

  1. The stomach
  2. The oesophagus
  3. The large intestine
  4. The small intestine Correct answer.

Explanation

Most chemical digestion is completed and most nutrients are absorbed through the villi of the small intestine, which has a very large surface area. The stomach mainly stores and begins protein digestion, while the large intestine mostly absorbs water and some minerals.

Question 2Animal Anatomy and Physiology

Ruminant animals such as cattle digest cellulose mainly because of which feature?

  1. A very acidic single stomach
  2. Symbiotic microbes in the rumen Correct answer.
  3. Sharp canine teeth for tearing grass
  4. Rapid passage of food through the gut

Explanation

The rumen holds a dense population of bacteria and protozoa that produce enzymes able to break down cellulose into fatty acids the animal can use. The host mammal itself cannot secrete cellulase, so it depends on these microbes.

Question 3Animal Anatomy and Physiology

A farmer notices a young pig has pale mucous membranes and is listless. Which blood component is most directly reduced in such anaemia?

  1. Red blood cells Correct answer.
  2. White blood cells
  3. Plasma proteins
  4. Platelets

Explanation

Anaemia is a deficiency in the number or quality of red blood cells or their haemoglobin, which carry oxygen. Pale membranes and weakness reflect poor oxygen transport by red cells.

Question 4Animal Anatomy and Physiology

Which structure prevents food from entering the windpipe during swallowing?

  1. The epiglottis Correct answer.
  2. The soft palate
  3. The diaphragm
  4. The glottis

Explanation

The epiglottis is a flap of cartilage that folds over the opening of the trachea during swallowing so that food passes into the oesophagus. It lifts again during breathing to keep the airway open.

Question 5Animal Anatomy and Physiology

Which type of muscle tissue forms the wall of the intestines?

  1. Tendinous tissue
  2. Smooth muscle Correct answer.
  3. Cardiac muscle
  4. Skeletal muscle

Explanation

The walls of the gut contain smooth muscle arranged in circular and longitudinal layers that produce peristalsis. Smooth muscle is involuntary and contracts slowly and rhythmically.

Question 6Animal Anatomy and Physiology

In poultry, which structure replaces the teeth for breaking down food?

  1. The gizzard Correct answer.
  2. The caeca
  3. The proventriculus
  4. The crop

Explanation

Birds have no teeth, so the muscular gizzard grinds food, often helped by swallowed grit. The crop merely stores and softens food before it reaches the stomach.

Question 7Animal Anatomy and Physiology

Which hormone raises blood glucose by promoting the breakdown of liver glycogen?

  1. Oxytocin
  2. Glucagon Correct answer.
  3. Insulin
  4. Prolactin

Explanation

Glucagon is released by the pancreas when blood glucose falls and stimulates the liver to convert glycogen into glucose. Insulin has the opposite effect, lowering blood glucose.

Question 8Animal Anatomy and Physiology

A cow is fed a diet very low in calcium. Which hormone will act to raise blood calcium by releasing it from bone?

  1. Insulin
  2. Parathyroid hormone Correct answer.
  3. Adrenaline
  4. Progesterone

Explanation

Parathyroid hormone is secreted when blood calcium falls and acts on bone, kidney and gut to restore calcium levels. This helps prevent milk fever and poor bone mineralisation in livestock.

Question 9Animal Anatomy and Physiology

Which chamber of the ruminant stomach is responsible for most microbial fermentation?

  1. The abomasum
  2. The rumen Correct answer.
  3. The omasum
  4. The reticulum

Explanation

The rumen is a large fermentation vat where microbes break down fibre and produce volatile fatty acids. It also hosts the microbial protein that later supplies the animal.

Question 10Animal Anatomy and Physiology

A piglet is born and must obtain antibodies from colostrum. This is because the newborn piglet has which condition?

  1. An overactive immune system
  2. A temporary inability to absorb fat
  3. No protective antibodies of its own Correct answer.
  4. Too few red blood cells

Explanation

Young piglets are born without maternal antibodies in their blood, so they depend on colostrum for passive immunity. The gut can absorb these antibodies only during the first hours after birth.

Question 11Animal Anatomy and Physiology

Which part of the brain regulates body temperature, hunger and thirst?

  1. The cerebrum
  2. The cerebellum
  3. The hypothalamus Correct answer.
  4. The medulla oblongata

Explanation

The hypothalamus contains centres that monitor and adjust temperature, feeding and water balance. It links the nervous system with the endocrine system through the pituitary gland.

Question 12Animal Anatomy and Physiology

Which blood vessel carries oxygen-rich blood away from the heart to the body tissues?

  1. The pulmonary artery
  2. The aorta Correct answer.
  3. The vena cava
  4. The pulmonary vein

Explanation

The aorta is the large artery that leaves the left ventricle and distributes oxygenated blood to the body. It is a high-pressure vessel with a thick muscular wall.

Question 13Animal Anatomy and Physiology

A farmer observes that a goat's rumen stops contracting after a sudden change of feed. Which consequence is most likely?

  1. Reduced microbial activity and bloat risk Correct answer.
  2. Improved fibre digestion
  3. Faster growth rate
  4. Increased milk yield

Explanation

Rumen contractions mix feed with microbes and move gas and digesta onward. If contractions stop, fermentation slows and gas can accumulate, causing bloat and reduced digestion.

Question 14Animal Anatomy and Physiology

Which structure in the kidney filters blood to begin urine formation?

  1. The bladder
  2. The ureter
  3. The glomerulus Correct answer.
  4. The urethra

Explanation

The glomerulus is a knot of capillaries inside the nephron where pressure forces water and small solutes into the capsule. Larger proteins and cells are normally retained in the blood.

Question 15Animal Anatomy and Physiology

Which feature of the small intestine increases its surface area for absorption?

  1. Large numbers of cilia on the outer wall
  2. A thick layer of fat
  3. Smooth cartilage lining
  4. Villi and microvilli Correct answer.

Explanation

Finger-like villi and their microscopic microvilli greatly multiply the absorptive surface. Each villus contains capillaries and a lacteal to take up nutrients.

Question 16Animal Anatomy and Physiology

A dairy cow with milk fever shows muscle tremors and collapse around calving. This disorder is caused by a sudden fall in which blood component?

  1. Potassium
  2. Iron
  3. Calcium Correct answer.
  4. Glucose

Explanation

Milk fever occurs when calcium demand for milk production exceeds the cow's ability to mobilise reserves, causing a sharp drop in blood calcium. Low calcium impairs muscle and nerve function, leading to tremors and collapse.

Question 17Animal Anatomy and Physiology

Which statement best explains why young ruminants are functionally similar to monogastric animals before weaning?

  1. Their abomasum is inactive
  2. Their rumen is fully developed at birth
  3. They cannot digest any protein
  4. Milk bypasses the rumen through the oesophageal groove Correct answer.

Explanation

In young calves, the oesophageal groove forms a tube that channels milk directly to the abomasum and bypasses the undeveloped rumen. This allows milk to be digested by stomach enzymes rather than fermented.

Question 18Animal Anatomy and Physiology

Which sensory structure in the skin detects touch and pressure in livestock?

  1. The hair follicle receptor Correct answer.
  2. The sweat gland
  3. The arrector pili muscle
  4. The sebaceous gland

Explanation

Hair follicle receptors wrap around the base of hairs and detect movement of the hair, giving information about touch. Other receptors in the skin detect heat, cold and pain.

Question 19Animal Anatomy and Physiology

Two lambs are fed the same amount of feed, but one has a heavy worm burden in the abomasum. Which effect on digestion is most likely?

  1. Faster rumen fermentation
  2. Improved mineral uptake
  3. Reduced feed conversion and weight gain Correct answer.
  4. Increased absorption of amino acids

Explanation

Parasites damage the stomach lining and feed on blood and nutrients, reducing digestion and absorption. The animal therefore converts feed less efficiently and grows more slowly.

Question 20Animal Anatomy and Physiology

Which sequence correctly describes the flow of blood through the heart of a mammal?

  1. Right atrium, right ventricle, lungs, left atrium, left ventricle Correct answer.
  2. Left atrium, left ventricle, lungs, right atrium, right ventricle
  3. Left ventricle, right atrium, lungs, right ventricle, left atrium
  4. Right atrium, lungs, right ventricle, left ventricle, left atrium

Explanation

Deoxygenated blood enters the right atrium, passes to the right ventricle and is pumped to the lungs. Oxygenated blood then returns to the left atrium and is pumped out by the left ventricle.

Question 21Animal Anatomy and Physiology

A pig is fed a diet lacking vitamin D. Which problem is most likely to develop?

  1. Poor bone mineralisation despite adequate calcium Correct answer.
  2. Loss of night vision
  3. Reduced red blood cell production
  4. Excessive blood clotting

Explanation

Vitamin D is needed for the absorption of calcium and phosphorus from the gut. Without it, even a calcium-adequate diet cannot be used well, so bones become weak and poorly mineralised.

Question 22Animal Anatomy and Physiology

A chicken is fed a diet deficient in calcium. Which production problem is most directly expected?

  1. Increased egg size
  2. Poor night vision
  3. Soft-shelled or thin-shelled eggs Correct answer.
  4. Reduced feather colour

Explanation

The shell gland uses calcium from the blood to build the eggshell, so a dietary shortage forces the hen to draw on bone reserves. Continued deficiency produces thin or soft shells and weakens the skeleton.

Question 23Animal Anatomy and Physiology

Which explanation best accounts for the very long small intestine of a herbivorous monogastric animal such as a horse?

  1. It lowers the animal's energy requirement
  2. It speeds up the passage of food
  3. It reduces the need for microbial fermentation
  4. It allows more time for fibre digestion and absorption Correct answer.

Explanation

Plant fibre is bulky and slow to digest, so a long gut increases retention time and surface area for fermentation and absorption. This helps the horse extract nutrients from a high-fibre diet.

Question 24Animal Anatomy and Physiology

A newborn calf fails to receive colostrum in its first hours of life. Which outcome is most likely?

  1. Faster rumen development
  2. Higher birth weight
  3. Increased risk of infectious disease Correct answer.
  4. Greater resistance to infection

Explanation

The calf depends on colostrum for passive immunity because its own immune system is immature. Without timely colostrum, protective antibodies are not absorbed and the calf is more vulnerable to infection.

Question 25Animal Nutrition and Feeding

Which nutrient class is the main source of energy in most livestock diets?

  1. Vitamins
  2. Minerals
  3. Carbohydrates Correct answer.
  4. Water

Explanation

Carbohydrates such as starches and sugars supply most of the energy in typical livestock rations, being broken down to glucose for maintenance and production. Minerals, vitamins and water are essential but do not supply significant energy.

Question 26Animal Nutrition and Feeding

A feed ingredient that provides a high proportion of protein in a concentrate mix is best described as which type of feed?

  1. Energy supplement
  2. Protein supplement Correct answer.
  3. Mineral supplement
  4. Roughage

Explanation

Protein supplements are feed ingredients deliberately included to raise the crude protein content of a ration, often oilseed meals or animal by-products. Energy supplements such as cereal grains supply mainly starch rather than protein.

Question 27Animal Nutrition and Feeding

Why is roughage important in the diet of a ruminant such as a cow?

  1. It replaces the need for water
  2. It maintains rumen function and fibre digestion Correct answer.
  3. It supplies most of the animal's protein
  4. It prevents all mineral deficiencies

Explanation

Fibrous roughage stimulates chewing, saliva production and rumen microbial activity, keeping the rumen healthy and enabling fibre digestion. Roughage is generally low in protein and cannot substitute for water or supply all minerals.

Question 28Animal Nutrition and Feeding

Which term describes the amount of a nutrient in a feed that is actually absorbed and used by the animal?

  1. Palatability
  2. Dry matter
  3. Digestibility Correct answer.
  4. Bulk density

Explanation

Digestibility expresses the proportion of a nutrient that is absorbed from the digestive tract and made available for metabolism. Palatability concerns how willingly an animal eats a feed, not how much is absorbed.

Question 29Animal Nutrition and Feeding

What is the main purpose of including salt (sodium chloride) in a livestock ration?

  1. To increase the protein content
  2. To act as a growth promoter
  3. To improve the colour of the feed
  4. To supply sodium and chloride and encourage intake Correct answer.

Explanation

Salt supplies the essential minerals sodium and chloride and also improves the palatability of the ration so animals eat enough. It does not add protein, promote growth directly or change feed colour.

Question 30Animal Nutrition and Feeding

Green forage that has been preserved by controlled fermentation is known as which product?

  1. Hay
  2. Silage Correct answer.
  3. Straw
  4. Concentrate

Explanation

Silage is made by fermenting moist green forage under anaerobic conditions, producing acids that preserve it. Hay is instead dried, while straw is the dry stalk residue left after grain harvest.

Question 31Animal Nutrition and Feeding

Which of the following is a common energy-rich concentrate used in poultry diets?

  1. Maize Correct answer.
  2. Fish meal
  3. Lucerne hay
  4. Bone meal

Explanation

Maize is a cereal grain high in starch and is widely used as an energy concentrate in poultry rations. Fish meal is a protein supplement, bone meal a mineral source and lucerne hay a roughage.

Question 32Animal Nutrition and Feeding

A farmer wants to reduce feed wastage in a piggery. Which practice most directly achieves this?

  1. Adjusting the feeder to reduce spillage Correct answer.
  2. Feeding all pigs from open troughs on the floor
  3. Mixing feed with large amounts of water
  4. Feeding once every three days

Explanation

Correctly adjusted feeders limit spillage and contamination, which is the most direct way to cut wastage. Floor feeding and infrequent feeding increase losses and spoil feed quality.

Question 33Animal Nutrition and Feeding

Which statement best explains why young calves should receive colostrum soon after birth?

  1. It contains roughage to start rumen function
  2. It provides antibodies before the gut closes Correct answer.
  3. It provides minerals that prevent all disease
  4. It supplies large amounts of starch for energy

Explanation

Colostrum is rich in antibodies that the newborn calf can absorb through the gut wall only during the first hours of life, before gut closure. It is not primarily a starch or roughage source and cannot prevent all disease.

Question 34Animal Nutrition and Feeding

A ration is described as balanced when it does what?

  1. Contains equal weights of every ingredient
  2. Consists only of concentrates
  3. Provides more protein than the animal can use
  4. Supplies nutrients in the correct proportions for the animal's needs Correct answer.

Explanation

A balanced ration provides energy, protein, minerals and vitamins in proportions that match the animal's requirement for its age and production level. Equal ingredient weights or excess protein do not make a ration balanced.

Question 35Animal Nutrition and Feeding

Which of these feeds would most likely be classified as a roughage?

  1. Soya bean meal
  2. Groundnut cake
  3. Molasses
  4. Maize stover Correct answer.

Explanation

Maize stover is the fibrous stalk and leaf residue of the maize plant and is high in fibre, so it is a roughage. Soya bean meal and groundnut cake are protein concentrates, while molasses is a sugary energy feed.

Question 36Animal Nutrition and Feeding

An animal's feed intake drops sharply when a new batch of feed is introduced. Which explanation is most likely?

  1. The feed has more protein than before
  2. The new feed is less palatable or has changed quality Correct answer.
  3. The animal needs less water
  4. The animal has suddenly grown larger

Explanation

A sudden refusal or drop in intake usually points to reduced palatability, spoilage or a change in feed quality. Growth or protein level does not usually cause an abrupt fall in intake.

Question 37Animal Nutrition and Feeding

Which mineral is most closely associated with the formation of strong bones and eggshells?

  1. Iodine
  2. Iron
  3. Calcium Correct answer.
  4. Copper

Explanation

Calcium is the principal mineral in bone tissue and eggshells, so laying hens and growing animals need generous supplies. Iron, iodine and copper are essential but serve other roles such as blood and hormone function.

Question 38Animal Nutrition and Feeding

Why is a sudden change of diet avoided when moving animals from one feed to another?

  1. It always increases milk yield
  2. It lowers the protein content of the feed
  3. It can disturb rumen microbes and cause digestive upset Correct answer.
  4. It reduces the need for water

Explanation

Microbes in the rumen need time to adapt to a new feed, so abrupt changes can cause acidosis, scouring and reduced performance. Gradual transition protects digestion and intake.

Question 39Animal Nutrition and Feeding

A poultry farmer notices poor growth despite adequate feed quantity. Which factor should be checked first?

  1. The age of the farmer
  2. The colour of the feed bags
  3. The protein and energy balance of the ration Correct answer.
  4. The number of windows in the house

Explanation

Poor growth with adequate quantity usually indicates a nutrient imbalance or poor feed quality, so the protein and energy levels of the ration should be examined first. Feed bag colour and house windows are not nutritional factors.

Question 40Animal Nutrition and Feeding

Which statement about water as a nutrient is correct?

  1. It supplies energy to the animal
  2. It can fully replace minerals in the diet
  3. It is only needed during hot weather
  4. It is required in larger amounts than any other nutrient Correct answer.

Explanation

Water is the most abundant requirement of livestock, needed for digestion, transport and temperature control in quantities far greater than other nutrients. It supplies no energy and cannot replace minerals.

Question 41Animal Nutrition and Feeding

A dairy cow is fed a ration very high in readily fermentable starch with little roughage. Which problem is most likely?

  1. Rumen acidosis Correct answer.
  2. Reduced milk production from lack of energy
  3. Increased chewing and saliva flow
  4. Improved fibre digestion

Explanation

Large amounts of rapidly fermented starch with little fibre produce excess acid in the rumen, leading to acidosis and poor fibre digestion. Roughage shortage reduces chewing and saliva, which normally buffer the rumen.

Question 42Animal Nutrition and Feeding

Which feed treatment would most improve the digestibility of straw for a ruminant?

  1. Drying it in direct sunlight for weeks
  2. Treating it with an alkali such as lime solution Correct answer.
  3. Storing it in open damp conditions
  4. Mixing it with clean sand

Explanation

Alkali treatment breaks bonds between lignin and fibre, making the cellulose more accessible to rumen microbes and improving digestibility. Drying, sand or damp storage do not improve fibre digestibility.

Question 43Animal Nutrition and Feeding

Which statement best describes the term 'crude protein' in feed analysis?

  1. The weight of the feed after drying
  2. Nitrogen content multiplied by a conversion factor Correct answer.
  3. The total fat extracted with ether
  4. The ash remaining after burning

Explanation

Crude protein is estimated from the nitrogen content of a feed, multiplied by a standard factor to approximate protein. Fat is measured by ether extraction and ash by burning, which are separate determinations.

Question 44Animal Nutrition and Feeding

A farmer mixes urea into a cattle ration. Which precaution is most important?

  1. Feed it only to very young calves
  2. Combine it with large amounts of roughage only
  3. Introduce it gradually and supply adequate energy Correct answer.
  4. Give it with plenty of fat

Explanation

Urea releases ammonia that rumen microbes use to make protein, but it must be introduced gradually with sufficient fermentable energy to avoid ammonia toxicity. It is unsuitable for very young non-ruminating calves.

Question 45Animal Nutrition and Feeding

Two rations supply the same total energy, but ration A has a higher proportion of fibre. What is the most likely consequence for a ruminant?

  1. Ration A supports healthier rumen function but may have lower intake Correct answer.
  2. Ration A will cause immediate acidosis
  3. Ration A will eliminate the need for minerals
  4. Ration A will supply more protein than ration B

Explanation

Higher fibre stimulates chewing and buffers the rumen, supporting rumen health, but bulky fibrous feed can limit intake because of gut fill. High fibre does not cause acidosis or remove mineral needs.

Question 46Animal Nutrition and Feeding

A pig ration is formulated to meet lysine needs. Why is lysine emphasised in pig nutrition?

  1. It supplies energy when protein is low
  2. It is the only amino acid pigs require
  3. It is usually the first limiting amino acid in cereal-based diets Correct answer.
  4. It prevents all bacterial infections

Explanation

Cereal-based pig diets are typically short of lysine before other amino acids, so meeting lysine needs allows the other amino acids to be used efficiently. Pigs require many amino acids and lysine does not supply energy or prevent infection.

Question 47Animal Nutrition and Feeding

A feed sample is analysed and found to contain 90 percent dry matter and 12 percent crude protein on a dry matter basis. What does this indicate?

  1. The protein is entirely indigestible
  2. The feed is unsuitable for all livestock
  3. The fresh feed contains 12 percent water
  4. The fresh feed contains about 10.8 percent crude protein Correct answer.

Explanation

Expressing protein on a dry matter basis means it must be adjusted for the water content. With 90 percent dry matter, the fresh feed contains about 0.90 times 12, which is roughly 10.8 percent crude protein.

Question 48Animal Nutrition and Feeding

A farmer observes that a group of cattle on a low-quality pasture has a dull coat and poor growth, though feed quantity is adequate. Which approach best addresses the problem?

  1. Provide a supplement of protein, minerals and vitamins Correct answer.
  2. Switch entirely to a high-starch concentrate
  3. Withhold water for part of the day
  4. Increase only the amount of pasture offered

Explanation

Low-quality pasture can be adequate in bulk but deficient in protein, minerals and vitamins, so a balanced supplement addresses the deficiency. Feeding more of the same poor pasture or an all-starch diet will not correct the imbalance.

Question 49Animal Health, Disease and Parasites

Which organism is the definitive host of the liver fluke Fasciola hepatica, where the adult worm lives and produces eggs?

  1. The pasture mite
  2. The sheep or cattle host Correct answer.
  3. The freshwater snail
  4. The free-swimming cercaria

Explanation

The adult fluke matures in the bile ducts of the ruminant host and releases eggs that pass out in dung. The snail is only an intermediate host in which multiplication occurs, and the cercaria is a larval stage that encysts on grass.

Question 50Animal Health, Disease and Parasites

A herd of cattle shows weight loss, pale mucous membranes and a high faecal egg count of a nematode. Which control measure most directly reduces pasture contamination by these worm eggs?

  1. Vaccinating all calves against internal parasites
  2. Adding extra salt licks to the drinking water
  3. Spraying the pasture with a coccidiostat
  4. Regular strategic deworming combined with rotational grazing Correct answer.

Explanation

Pasture contamination falls when egg output from infected animals is reduced by effective deworming and when larvae are given time to die before stock return. Rotational grazing rests paddocks so that infective larvae decline. Coccidiostats and salt licks do not target gastrointestinal nematodes.