Sunday, July 26, 2020

Strategies for Enhancement in Food Production - Notes | Class 12 | Part 1 : Animal Husbandry


-    It is the scientific agricultural practice of breeding and raising livestock.
-    It deals with the care & breeding of livestock (buffaloes, cows, pigs, horses, cattle, sheep, camels, goats etc.), poultry farming and fisheries.
-    More than 70% of the world livestock population is in India & China. However, the contribution to the world farm produce is only 25%, i.e., the productivity per unit is very low. Hence new technologies should be applied to achieve improvement in quality and productivity.

Management of Farms & Farm Animals
1. Dairy Farm Management (Dairying)

-    It is the management of animals for increasing yield and quality of milk and its products.
-    Milk yield depends on the quality of breeds in the farm.
-    It is important to select good breeds having high yielding potential and resistance to diseases.
-    Ways for the yield potential:
o Look after the cattle (housing well, give adequate water and maintain disease free).
o Feeding of cattle in a scientific manner – emphasis on the quality and quantity of fodder.
o Stringent cleanliness and hygiene of cattle & handlers while milking, storage and transport of the milk.
-    Nowadays, these processes have mechanized. It reduces chance of direct contact of the produce with the handler.
-    To ensure these stringent measures there should be
o Regular inspections to identify and rectify problems.
o Regular visits by a veterinary doctor.
2. Poultry Farm Management

-    Poultry is the domesticated birds used for food or eggs. E.g. chicken, ducks, turkey and geese.
-    Components of poultry farm management:
o Selection of disease free and suitable breeds.
o Proper and safe farm conditions.
o Proper feed and water.
o Hygiene and health care.
Animal Breeding

-    A breed is a group of organisms related by descent and similar general appearance, features, size etc.
-    Breeding is the modification of genotype of an organism to make that organism more useful to humans. E.g. Jersey (improved cattle breed), Leghorn (improved chicken breed).
-    Animal breeding aims at increasing the yield of animals and improving the desirable qualities of the produce.
-    Breeding is 2 types: Inbreeding and out-breeding.
a. Inbreeding
It is the mating of more closely related individuals within the same breed for 4-6 generations. This strategy is as follows:
o Identify and mate superior males & females of same breed.
o Evaluate the progeny obtained and identify superior males and females among them for further mating.
In cattle, a superior female produces more milk per lactation. A superior male (bull) gives rise to superior progeny.

Advantages of Inbreeding:

o  It increases homozygosity to evolve a pure line animal.
o  It exposes harmful recessive genes that are eliminated by selection.
o  It helps in accumulation of superior genes and elimination of less desirable genes. This increases the productivity of inbred population.
Continued inbreeding, especially close inbreeding, may reduce fertility and productivity. This is called inbreeding depression. To solve this problem, selected animals should be mated with unrelated superior animals of the same breed.
b. Out-breeding
It is the breeding of the unrelated animals. It includes out-crossing, cross-breeding and inter-specific hybridization.

i)  Out-crossing:

-    It is the mating of animals within the same breed, but having no common ancestors on either side of their pedigree up to 4-6 generations.
-    The offspring of such a mating is known as out-cross.
-    It is the best method for animals having low milk productivity, growth rate in beef cattle, etc.
-    It helps to overcome inbreeding depression.

ii)  Cross-breeding:

-    It is the mating of superior males of one breed with superior females of another breed.
-    The desirable qualities of 2 different breeds are combined.
-    The progeny hybrid animals may be used for commercial production or may be subjected to inbreeding and selection to develop new stable superior breeds.
-    E.g. Hisardale (sheep) developed in Punjab by crossing Bikaneri ewes and Merino rams.

iii)  Interspecific hybridization:

-    It is the mating of male and female of two different species.
-    In some cases, the progeny may combine desirable features of both the parents, and may be of considerable economic value. E.g. Mule (male ass X female horse).
Controlled breeding experiments
1. Artificial insemination

-    The semen collected from male parent is injected into the reproductive tract of selected female by the breeder.
-    Semen is used immediately or is frozen and used later. Frozen semen can also be transported.
-    Success rate of crossing mature male & female is low even though artificial insemination is carried out.

2.  Multiple Ovulation Embryo Transfer Technology (MOET)

-    It is a programme for herd improvement. It improves chances of successful production of hybrids.
-  In this, a cow is administered hormones such as FSH to induce follicular maturation & super ovulation (production of 6-8 eggs per cycle instead of one egg).
- The animal is either mated with an elite bull or artificially inseminated. Fertilised eggs at 8–32 cells stage are recovered non-surgically and transferred to surrogate mothers.
-    MOET has been demonstrated for cattle, sheep, rabbits, buffaloes, mares, etc.
-    High milk yielding breeds of females and high quality (lean meat with less lipid) meat-yielding bulls have been bred successfully to increase herd size in a short time.

Bee-keeping (apiculture)

-    It is the maintenance of hives of honeybees to produce honey and beeswax.
-    Most common species that can be reared is Apis indica.
-    Honey is a food of high nutritive and medicinal value.
-    Beeswax is used in preparation of cosmetics, polishes etc.
-    Apiculture can be practiced in an area having bee pastures of some wild shrubs, fruit orchards and cultivated crops.

 Important points for successful bee-keeping:
(i)      Knowledge of the nature and habits of bees.
(ii)    Selection of suitable location for keeping beehives.
(iii)  Catching and hiving of swarms (group of bees).
(iv)  Management of beehives during different seasons.
(v)    Handling and collection of honey and beeswax.
-    Bees are the pollinators of crop species such as sunflower, Brassica, apple and pear.
-    Keeping beehives in crop fields during flowering period increases pollination. It improves crop and honey yield.


-    Fishery is an industry of catching, processing or selling of fish, shellfish or other aquatic animals (prawn, crab, lobster, edible oyster etc.).
-    Freshwater fishes: Catla, Rohu, common carp etc. Marine fishes: Hilsa, Sardines, Mackerel, Pomfrets etc.
-    Fisheries provide income and employment to millions of fishermen and farmers.
-    Aquaculture (farming of aquatic organisms) & pisciculture (farming of fishes) are the techniques to increase the production of aquatic plants and animals.
-    Blue Revolution: The development and flourishing of the fishery industry.

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