Modelo multinivel

L

c

ic es

tt-

r

x

Cheviot mves

found

ropeatabi lities

of

0.00 1 0 . 1 0 and

0 . The first fl o ck first l anbed a s 1 -yea

r

-ol

d

s and the second as 2- year-olds . The

tjird

flo ck 1vas a s eparate ono . ID;ws laltlbed at ages varying froo 1 - to 7-years . Purser ( 1 9G5 ) cal culated rcpoatabilities

of

0 . 07 and 0 . 1 0 for Scottish Blackfaco and Welsh Mountain breeds

respectively . 'l1he anirJals in the so two breeds v1ere 2- to

6-

and

2-

to 4-year--olds rospectiv0J y.

Estii:1a.teG of ropoatab i l i t/ ob tain8d. arG u su a l ly low . T.�.le e s tine. toD b::.s eci ') ll 8':lOS lanbin(;

ra. t�wr

tian mw s r.1a t od

aro

l�·cneral ly

�ne ther �8t�od so�Gti�os used to ostinat e ropoatabilities i s

t �::.CJ J:'O(Jros sj.on 0:.:' ::.:ubGoq_uont on early perforrJunc o<> o 'I'urner

(

1

�) 6J ) ro·-

vi

mm t;.d.s o 'i'l:.i s

:.:ot!...:.u·l

is net used ir.. tb.i<> s tu.cly.

Hevi o': of ostL:w.t o s of �eri tatility

fur reprouuctivo

rat e

�avo beon c;·:i.ven b y Rocvo and

Roburtson ( 1 9 5 3 ) 9

Rae

( 1 9 5 6 ) 9

C l arke

( 1 9 6 3 )

.J.ni fur:1or

( 1 969 ) "

tl.lo lat·tor b oin.-;

tl:o

r.10 st oxt c:1s ivo . On J i s cus sin-.:; V:e estLnt i o • 1 of t� ,_, :.J.ori _{ti l;ili ty of rc1Jroducti vo} ra tu

l'urner ( 1 9 69 )

record.

is ccr.1pli cc:>.t8Ll by t:_o f<'. ct tl1o mr o s vd.t�:

::t zoro

l'oco.rd he.vo no dau. ;·llt ors . 'l1'.:_o

proble:··

i s

p:::rtly ov orcono b y asin,_,. �lalf- s ib anJ.lysis

( ·'·'lOLl.""'··

_{u _ :_,. ....} t'·· .; _{. • .J.. �} .... cst1·_{.I . v v} ··a· · " < > l. s s t i l l biacou

b e caus e

t :w s:i.ros coul� not cooe froi:J b:1rren m·r e s

)

9

by includin .. � muro t:...C! n o n3 :reco rd

(

_{m;e:s continually}

barren ro , of cours e , _still excluded

)

, o r by con­

fini�� t�e analysi s aither to l i t t er s i z e or type

of

birtlJ.

(

sit:j'lo or oul t ipl e

)

. 1 1

Thls _ evievl of JGri tubili ty l o oks at e s t iraat es of the

different rJoasures of r;:;pr_oductive abil i ty in the saoe order as the re- peatability est ii:la.tes uero revieHecl.

( a)

Barrennes s

(

_{ewes fai}lin,3 to lar;"tb

)

37 0

j

oined , usinc-; t�e intra-sire �alf-sib i-:Jethod , >-m s low for botll the Scot tis�1 Bl.:tckf.::tco

(

o . o

)

and

TJe l s:1 i·iountain

( 0 . 03 )

breeds

respectively.

T.j_e

Sco t t is�

B l a ckfacG

_{Here aw"l} frou 2-

t o G-ye 2rS _and

t �lO

:fel sll

Hountain

frorJ

2- t c 4-yea.rs of ac·o . S�:

e

l t<m

( 1969 )

7

Horkin,_:; �-;it�­

tvro

fine

Hoo l od flo cks � 01) tainod a �cGritil

b

il

i

ty esUDato of

0 . 1 7 .

Bc>L Ko�1n0dy

( 1967 )

anJ Yo u,-1,.:;> :, l . 9

( 1 ] 63)

�1we .r;i

van

results for cl1o

Austra.lia:1

1'-leri no . Kcmncdy analysed 2-year--olcl

Pep1•in f.Ior:�no

eues a:.1.d. arrived a t a

J.ierj_tabi l i ty

of

0 . 20 .

You.nc 7

0 t 9 obt 1 inod values of

0 . 03 9 0 . 35

and

0 . 1 9

for

2-year-olcls 9

3-year-- olds a:d t:1o

sur.: of

_{t�1e t;ro} a:.5·c;. 'f:lis s:_._ovs a

.:1irr�

... er Lteritnb i l i ty e s t i ,at e lv

i

tt. an in

c

rea

s

e in ac;e of m·Te . Re s

u

_lts fror.1 a_r,ot�1

e

r

fine

v;;:v.: l od

broecl,

tllO Ra:;,'u o ui ll o t I :lavo be,m gi V8l1 b y s� ... ol t o n nnci ?IenzL;s

( 19GJ).

They

cal c u l c. t ocl

lifo ti:.le

_{·r J.hlos of}

0.21

_{and 0.2J usin : t:w} p::; t o rnc:.l

;_.-,al f-<;ib _:1.nd :i. n t ra-sire l' ·3r;rG G s i o n _{,-.lct:.:.ocls} rc::spoctively .

Do sai

r..md

·.rint ers ( 1 ') 5 1 b ) clotc:r::inGll

:.:.oritab

i

lity by t�:.o i

nt

ra- sir�,

:cor�re s si o n

of t�'-'-' L.H.ib ini_; rocorJs o f _t�le dau.:::-��ters on

t;:,os e

o f t::tGi r

d.iLis . Usinc·; tuo :liffe:.. ent .. JOt�·tods o f ,::;-ro u.rln,;

t :1G records

ot

t:1e dens and t�lGir

d:�u.<l.:t ers

t�.e;y ar

r

ived at averar;·e heri tal.J i l i

t

i

es

of

0 ,03 anJ 0.07

for vari ou s breeds . S�ar:tf o l d i n ' s

( 1 9GO )

s s t i <.1at e s for

_t:.:..o

llGri t2.bili ty of th<:. rezsl b r o c d ri1nc;od frou

0. 03

anJ. 0 . 17

and

averai_;ed O,OJ. ire used t:.:o intrc.-siro rel;re s s ion o f daur�htcr on dao . Karau and Ra�;ab

( 1 953 ) ,

al so using

tL.e ·rexel

breed ? obtaineJ.

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