Question

What is the difference between rearing our local breed cows and exotic breed cows?
A.Our local breed cow produces small quantity of milk but exotic breeds produce large quantity of milk
B.Our local breed cows do not have protective capacity against diseases, but exotic breeds have the capacity
C.Milk of our local breeds is pure white in color, but exotic breed cows may produce yellow color milk
D.Our local breed cows eat high quantity of food and produce little benefits but exotic breed cows eat small quantity of food and produce more benefits

Answer 1

Hint: Local breeds of cows are indigenous to India. Gir, Red sindhi, Sahiwal, deoni, hallikar, amritmahal, khillari, kangayam, ongole and Krishna valley are some of the examples of local breeds of cows. Exotic breeds are developed abroad and brought to India through crossbreeding. Jersey, Holstein Friesian, brown swiss, red dane, Ayrshire and Guernsey are some examples of exotic breeds of cow.

Complete answer:
Option A Our local breed cow produces small quantities of milk but exotic breeds produce large quantities of milk: Cross breeding through exotic bulls gives early maturity, higher weight of calves, better reproductive efficiency, better growth rate and high milk yield capacity to the offspring through inheritance of desired parent traits. Hence, milk secretion is more in exotic breeds of cow.
Option A is correct
Option B Our local breed cows do not have protective capacity against diseases, but exotic breeds have the capacity: Indigenous cow breeds also have resistance and protective capacity against diseases. Exotic breed also possesses protective capacity against diseases.
Hence, Option B is not correct
Option C Milk of our local breeds is pure white in color, but exotic breed cows may produce yellow color milk: Local breed cows produce gold and yellowish color milk. The color is due to the presence of beta-carotene present in grass. Commercial diaries feed the exotic breed with corn and soy. Hence, milk of exotic cow breeds is white in color.
So, Option C is not correct
Option D Our local breed cows eat high quantities of food and produce little benefits but exotic breed cows eat small quantities of food and produce more benefits: Local breed surti consumes lesser food than exotic breed mehsana. So, it is difficult to accurately generalize.
Option D is not correct

Option A is the correct answer.

Note:
Crossbreeding is defined as a mechanism of breeding an organism with an intention to produce offspring to show the traits of both parent lineages and produce new organisms with hybrid qualities. Example of a crossbred cow is Frieswal cattle, which is produced via breeding of Friesian and Sahiwal cattle. Crossbreeding is also known as designer crossbreeding.