Agricultural Science English Paper 1 2015 Questions and Answers Part 2

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Two growth stimulants used in animal production systems:

  • Thyroid regulators

  • Hormones

  • Antibiotics

  • Tranquilizers (Any 2)

Growth response of the heifers at a volume of 15 ml:

395 kg

Internal Parasites

Identification of the type of a parasite:

Internal parasite

Two negative impacts of an internal parasite:

  • Depriving host of nutrients

  • Sucks host’s blood/causes anemia

  • Lesions/cysts inside host

  • Decreases host’s productivity

  • Progressive weakness

  • Death (Any 2)

How the animal is infected:

  • The animal will ingest

  • Metacercaria through grazing

Intermediate host:

Snail

Three pasture management measures of controlling Internal parasite:

  • Rotational grazing

  • Resting of infected pastures

  • Allowing animals that are resistant to specific internal parasites

  • Avoid wet places

  • Use of zero grazing

  • Removal of manure/hygienic measures (Any 3)

Question 4

Animal Reproduction

The Diagram below Represents the Reproductive Canal of a Farm Animal

Process in part D:

Spermatogenesis

Identify parts A, B and E:

  • Label A – Seminal vesicles/vesicular glands

  • Label B – Vas deferens/sperm duct

  • Label E – Scrotum/scrotal sac

Two congenital defects of part D:

Cryptorchidism– the condition whereby the testes remain in the abdominal cavity and do not descend into the scrotum

Hypoplasia– the condition whereby the testes are underdeveloped

Two functions of the part C:

  • Storage of semen

  • Maturation of sperms

  • Secretion of buffer

  • Transportation of semen

  • Concentration of semen

Oestrus

Oestrus

  • It is a period when non pregnant female animals

  • are receptive to male animals/allow mating

Three Signs of Oestrus

  • Vulva is swollen/reddish

  • Mucous discharge

  • Cow is restless and bellows often

  • Mounting other cows

  • Isolation

  • Decrease in food intake/loss of appetite

  • Legs and flanks are muddy

  • Allows mating (Any 3)

Three Practical Methods to Identify Cows on Heat

  • Observation of animal Behaviour

  • Place a bull in pen near the cows

  • Bulls marked with a chin ball marker

  • Tail paint on tail head/tail paint markers

  • Heat mount detectors (Any 3)

Graph of Oestrogen/Progesterone Levels in a Cow over 22 Days

Day Cow Will Mate with a Bull

Day 4–6

Motivation

  • Highest level of Oestrogen

  • Cow will be on heat

Day of Ovulation

Day 4–5

Stage when Progesterone is Highest

Met-Oestrus

Whether Cow Became Pregnant

Cow did not become pregnant

Motivation

  • Progesterone levels declined/decreased

  • after day 16 (2)

Modern Technologies: Artificial Insemination (AI), Synchronization, Etc

Description of Synchronization of Oestrus

  • Making the Oestrus cycle of a number of female animals

  • to occur approximately at the same time

Three Advantages of AI in Dairy Cows

  • Improving the genetic quality of the offspring

  • No need to buy/manage expensive bulls

  • Can use semen of one bull to inseminate many cows

  • Prevents the spread of sexually transmitted diseases

  • Inferior sires can be detected

  • Can use semen from a bull after injury or death

  • Animals of different size can be mated without injury

  • Semen can be frozen for many years

  • Semen can be transported and used worldwide

  • An ejaculation of one bull can be used for many cows

  • Higher conception rate can be achieved (Any 3)

Four Sequential Stages Used in ET

  • Synchronization of Oestrus in donor and recipient cows

  • Superovulation of donor cows

  • Insemination of donor cows

  • Washing of the embryo from the uterus

  • Transfer embryo into the uterus of recipient cows (Any 4)

Total Section B: 105

Grand Total: 150