Sardar Krushinagar Dantiwada Agricultural Uiversity 2009 Bachelor of Veterinary Science

SEMESTER END exam

DAIRY CATTLE BREEDING-II
(AGB-816)
Marks:50


Q.1.a.Write in brief on any 3 of the following (6)

1.Pedigree selection 2.Linebreeding
3.Heterosis 4.Grading up

b.Describe in brief the field progeny testing programme for dairy sire (4)

Q.2.a.What is the genetic and physiological basis of inbreeding depression. (4)

b.Describe in brief the effects of inbreeding in dairy cattle. (6)

Q.3 Discuss in detail the breeding policy of India for dairy cattle
with special reference to Gujarat. (10)

Q.4.a.State actual or false (5)
1.Intersemating in dairy cattle outcomes into loss of heterosis.

2.Fullsib mating increases the inbreeding coefficient by 50%in
1 generation.

3.Relationship ranging from 1st cousins is 12.5%.

4.Individual selection in dairy sire is recommended when the heritability of
milk yield is 0.90.

5.The intensity of selection increases when animals culled increases.

6.Family selection is preferred for selecting animals at an early ages
for traits expressed after sexual maturity.

7.The accuracy of estimating breeding value of a sire increases by decreasing
the number of progeny per sire.

8.The use of multiple record is recommended when repeatability of a trait
is 0.01.

9.The age at 1st calving is a repeatable trait in dairy cattle.

10.An individual is related to its grand parent by 50%.

b.Define/explain in 1 or 2 phrases. (5)
1.Epistasis 2.Inbred line 3.Selection intensity 4.Repeatability
5.Interbull 6.Herdmate 7.Topcrossing 8.Outcrossing
9.Tandem selection 10.Intersemating

Q.5.Give formulae for the followings:- (10)

1.Contemprory daughter avg. index.
2.Krishnan's index
3.Genetic gain per year.
4.Relationship coefficient when both the individuals are inbred.
5.MPPA of a cow.

Earning:   Approval pending.