Misc. Flashcards

0
Q

generation interval of BUFFALOES

A

M 5 yrs

F 3.5 yrs

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1
Q

generation interval of CATTLE

A

M 4.5 yrs

F 3 yrs

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2
Q

generation interval of SHEEP & GOAT

A

M 4 yrs

F 2 yrs

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3
Q

generation interval of POULTRY

A

M 0.7 yrs

F 0.6 yrs

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4
Q

intensity of selection is decreased by selection for more than one trait and it is equal to __________ for each trait

A

1/square root N

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5
Q

name two method of MEASUREMENT OF RESPONSE

A
CONTROL SYSTEM
STATISTICAL ANALYSIS(phenotypic & genotypic trend)
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6
Q

name the 3 ways of CONTROL SYSTEM

A
  • unselected(random bred) control population
  • two way(bidirectional) selection
  • repeat mating
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7
Q

name 4 methods of STATISTICAL ANALYSIS(phenotypic & genotypic trend)

A
  • estimation of phenotypic trend
  • estimation of genetic trend
  • enviromental trend
  • genetic change by direct selection
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8
Q

define CONTROL population

A

a population whose genetic value remains unchanged over generations

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9
Q

unselected(randome bred) control population system is used in ________ species. WHY?

A

poultry

because it is easy to maintain control population

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10
Q

formula for rate at which the homozygosity is increased

A

F=1/8M + 1/8F

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11
Q

it is suggested that control population should contain _____ males & _______ females

A

25-50 males

50-100 females

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12
Q

two way(bidirectional) selection is not feasible for LARGE LIVESTOCK? why

A

because the selection for DECREASED PERFORMANCE is not justified

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13
Q

adjustment of AGE EFFECT OF DAMS is done in which method of CONTROL SYSTEM

A

Repeat mating

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14
Q

repeat mating is more restricted to ______ and ______ species

A

poultry(for control population too)

pig

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15
Q

advantages of REPEAT mating

A
  • less expensive
  • no problem of G x E interaction
  • no porblem of POPULATION size
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16
Q

the characters under selection are called

A

selection objectives

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17
Q

simple method to calculate EXPECTED PRODUCING ABILITY was given by ______ called as_____

A

Lush

Most Probable Producing Ability(MPPA)

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18
Q

expand EPD

A

Expected
Predicted
Difference

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19
Q

name the scientist who noticed resistance to diseases among WHITE LEG HORNS

A

Hutt

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20
Q

________ found out genetic variability in the occurance of certain disease in MURRAH buffaloes

A

Tomar

21
Q

3 ways to find individuals showing resistance to certain disease

A
  • occurence in normal condition
  • inoculation with pathogen
  • using INDICATORS of disease
22
Q

animals prone to Str. Aglactiae has high proportion of ________ in teats

A

PALMITIC ACID

23
Q

animals resistant to Str. Aglactiae has high proportion of ________ in teats

A

myristic, palmitic and linoleic acid

24
Q

in cows resistant to MASTITIS, level of _______ & ______ were highest in lactosebum

A

LAURIC , myristic acid

25
Q

Name indictorof resistance of EYE CANCER in HEREFORD cattle

A

pigmented eyelids(solid ring of pigment around eye)

26
Q

indicator of resistance to PULLORUM DISEASE in chickens

A

have BETTER CONTROL to maintain their body temperature

raise temp. to 106 F by 6th day of hatching

27
Q

indicator of resistance to MAREK’S disease in birds

A

have RBC antigen B21

28
Q

birds susceptable to MAREK disease having _____ antigen on RBC

A

B19

29
Q

indictator of resistance to AVIAN leucosis in birds

A

lack antigen R1

30
Q

in selection for disease resistant, maximum selection is achieved when the proportion selected is ________ to the proportion of resistant individuals

A

EQUAL

31
Q

individual selection is also known as _________

A

PERFORMANCE TESTING

32
Q

expand PBV

A

probable breeding value

33
Q

formula of PBV

A

PBV=selection differential x heritability of trait

34
Q

the phenotypic value is poor indicator of B.V if Heritaiblity is _______

A

LOW

35
Q

methods of multi trait selection were given by

A

HAZEL & LUSH

36
Q

selection is practised for 1 trait at a time in ______

A

tandem selection

37
Q

least efficient method of multi trait selection

A

tandem selection

38
Q

expand ICL

A

independent
culling
levels

39
Q

ICL method involves selection of _______ traits at a time

A

two or more

40
Q

minimum standard in set in which method of mutitrait selection

A

ICL

41
Q

ICL is used for selection of cattle used in _______ purpose

A

SHOW

42
Q

for show purpose , ________ method of multitrait selection is used

A

ICL

43
Q

selection index method is aka

A

total score index

44
Q

in Total score method, how many triats are taken simultaneously

A

SEVERAL traits

45
Q

the advantage of index method ______ with the number of traits

A

increases

46
Q

selection index method involves the technique of _________

A

discriminant function

47
Q

discriminant function was developed by ________, used by _______ and applied to animals by ______

A

fisher
smith
hazel

48
Q

in estimating economic value , all traits are given +ve sign except ______ which is given -ve sign

A

AFC

49
Q

relative efficiency of index method increases with ________ when compared to tandem method

A

n

50
Q

relative efficiency of index method rises with _____ and fall with ______ when compared to ICL

A

increasing n

increasing i

51
Q

the superiority of index method rises with _____

A

Increasing n & i