A study of some factors affecting reproductive performance in New Zealand Romney and Border Leicester X Romney two-tooth ewes : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science in Animal Science at Massey University

Copyright is owned by the Author of the thesis. Permission is given for

a copy to be downloaded by an individual for the purpose of research and

private study only. The thesis may not be reproduced elsewhere without

the permission of the Author.

A ,j'Ilt0Y OJr ;CIiftt FACfr)Rj .{I,t'tui:'fn;,i itdpiioirilcuvd i:lllti}JR}tal.tcE

Di

ll;::i: ZbAirAlflJ rtoil{i,y _'.}1J rloltwrt titt0u.;ttr:jt X AOffiEI :};O-tl,X)?ii U.'ifi;

s th66ls

pri@.sont€d

ln purtf*"f fulfllnncnt of the

Fqnriromonts

tor

tho

degroo

of estsr of

Aul"terltur.rr-1 ^jd,onoo

ln Anlrnl

^sa{.cnil

et

?isssoJ

Untvunrlty

;,,$utifr AJtlifiJR LAiiStfi

rnr

'.) :, ': (r 1.

I i\ :, c \, ,,

?ni,s

Itve{etltjrltton

aar: &reluotsd

Et tlrs

^,.lhuvp

ltoth:ctlm

$cntrnop

part of tiro lbilartffilrrt of

^..,iioep :iusth;r.fttq/, iblleoy

llniturltlrr

i''lr* o:qlo:'irnentJ}.1 uorslt e+:t

ol'

orrc _J{!{L|PJ

&rfutl*1

CIOr-r.,on61f!:i

ln

Fobnurry

llll0t

and rtrprt:rrsntn

orf

_S"yrd trcimal$r bs'

tbo ertho!

uruligr

tho.uSrowinlfir of, iir

jie r$r licllorm.klr

iioitrlofl

Jhoop:hrubo,nd4y Drpa.rkrcnts :Iaaa3r

Linlverelt;'r

ACKllii I' !l l: f

^..:

lihc

i:uthor

1$

spGolally

Lrrrtobtad

to hls

e.rpsnrtJof .Jr ^,.rFr

; oi.lonalcl

for hlg lnv.rlulrble

.'+rl.lr.nor: and eeoletanotr

in olpor!ilntsl

wori( irfid a.lvioo

ln

trre pRtir*ri-tlon

Of thirs

:r,fltlulcnlpt.

jpeoL.:I _{thardco rr:ne Jue}

to i,rofcssor A. L.

^riao

for arlvlot ln statl.rdoal a,n;:lyeiog to r f. :'uir f,or toclrnlo.rl

asoi{rtanoo lrrd

to

^.

r ii. Irttr;irrll for tlro

c,;.re

of

^anlrn*ls.

ir"tofi.rl

{rdoloxledgor:to&t

ic

^rrpde

to r t,. .i.

,i}rltchead ard f,:!r?!

,t.nff1

. o."relqt

tL r.eltoh

^.:urtl

,,

_Au,stln

for tlro

;:hoto;4rrrph1O

'drorkl j{r ii.

l'h.:toher

for

l.,rbor't0r5r arrsl-rta,nooi ^,

t P. thrtollffc for

coirrprter

*sriltta,nonl l.ir;

^e

iJr

t-ar,lpioll arxl

tho libn*ry steff3 Jiaro rrbr:riltorlc:r for

eoru,:

t111p1tlonl

and

to

^.

ts V.

lirru,n

t'or

thc

typiruj of tlrlc nalhlrcrlptr

;riil,tu.le l: sxtfrniiel to

,'rofr:,rsor

tl.

.,o

..ulrforll ;l! rjl

^.ie

Ickharnl arxl

'r bi. ii. tfurrla *llth

wlpm

tho *uthor

lit.ui rn.u!

holpt[],

illgc*rsBl,on$.

It 1r o

;rlcrruufe

tu

iinllnuulo.rg'

tlre finmottll euliutsnsr of

.',o

r". i;l.ii.lt;itfiei irt{i. l'ittl

.ruLltt}f ;r rrr &I$O

ln n,6r*lpt of a l{g .Jsslt{rrt ool ltoml

.iohol ..rshiir.

);'lnal\tr vory spcci*l thul.;s

&ro duo

to

r1y

rrife

rJorbars

for lrcr

:l&tierr@, mrpDoft and, enr:ouj.gonont

thrcu;hcut thla

rhrdgl.

Clraptor

TABLT'

OT

C0NfriN'15

LIJT OF TASIJ]|;

LTJT OF FICUNSS rNTROrftsTIOrr

RWItlr Or r+TunAqJn$

SWCHTONISATION oP Oi:;iiTROU;j CICi,!;ij PNOiITCTIOI OF OVA

WA STORIGE

XtsAN-;flER OF OVA

blrRltIVAL Alt.u DtltuuiPlrif{f 0F 8R .}r.i8EtiilED OYA DI Tiilii iillllJP

fftCtINDITI

IN

'I'llli ^E5:;E

UTI:RIIIU CAPNCITY

:jIZrL O!' IrAj,Si A'I DIittH

Lnfn$EIOllT OI' ^LAl.'tl]$ A':' 'r,'UAlrIN0

IT.ATIRfALS AlfD l4rllIOD$

AI{IMLS

IqaNAcEtlltlfT oF AllIn{Ls

FI$FlltI ;'fi;il{TAL PLtu\

Ionl,{}l{s:i A}tj.} TRhtArirrnTi ItAl.:

FllRfIl,ITI

O'A BECW}'RY OVA TItANJtr}iN FACU ;f0(JL OR;OINO

OB.EiIVATIOII$ ON Plli i0r:ltY

![rmt01Jj oF A]'ALbIS

SB{.C$RO}| { i&TIOF ^{A}IIJ f{OBi} lt;l;,At ;jII }il.Il.ti i'IO}t OF i",ldEjJ goR wLtnA$stfii4

I}IIIICTIOII OJ' O8.jtttu.j FOr,LOl;Il{0 PRO0,.,;;fii0EN rRaATj.'ihx{r

Pq#t

3 4 5 6

B

10 12 r3

15

17 17 11

r8

18 20 20 21 22 22

?.3

a

?_8

u

l. rffeot of

^breed a,rd, a+re

of

^{ewo on}

tht

manl,fost+tlon

of ooEtnrs

²⁸

III

Cha;:tor shffr

?9 29 30 12 34

2. $ffoot of

^{brl.oed, end a6o}

of crc

on

tho tine-lntervrd

beterc$n &pon6g

rt

tlrilrciwal artd oostnrc Pn0nic'fl0il

rjt'

CffA iiiR{rj U)t;Oit Ee;Hj

lr

Oootrcu'J Oyolo

lqrJth

follor,rtng P1li1.r1 lnjOCtlOn

')t.

Otrari,a.n r€rpons$

3.

^Rcoo?,,t?

of

ova

4, Fertlltsotlon of

remv&aod ove,

cL$"lVi$." $i: ri'l.;;lTrfI.l4:,,r (rya

fr "ihortolt

^{r;nd lons$;rt}

lnt$lnal aftcr ths

ongst

of ocotnrs to the

rsooyory

of

eaoh cleavagu sttrgr

2.

^i.lcrrn

Intcrrrl eftor tho

onset

of

oo;rtnrs

to ths

rscovCIt1/

of

oaojr olorv+i.3s st."aF

.i;'i,U'Xr?trA{, ftt,.ttTriiiliT ;;F $i

S: !iI?,i

^i,e ,.'.,t,.

I

29

n|

34

34

I5

TT

l.

2t

J.

.1"

35

tiffoot rf

brsod

of wo

on ovtrlatlon

ratc

15

r;ffeet of

oue

blrth

lrlrti( on

ovulatlon

rnto

_J6

Ilolatlon"*hlp _bqtueon

fl6s-,rlr,rlc onl

ornrJ,atlon ft,ltrj

-

ii,orncloy cuea

Influsnce of llve ret;ifrt

on ovularl,on rBt€

;u;l\llVjiL Oj' ?ttn!",!.i,;rlit. ., W,'i

lll.j Ufijil?tli

C.IPACITI

;.i{iiWrfriir

tl;i 'fRl!'

Irii i,it,,") OJ ^'r

1r

0onosptlon

rotr: follorl,n,; trr:nsfcr

;.

Ova uunrlv&I

i;'f i,iiIHi.i f,18ArtI.i,Y ,rlFli.,r,t lixj$ Tllff ' _,l'T!l;t

3T

tB

v, It]

39 39

Chcpteir

fesr lrlrltr'ltr,rtlon of ltttsr siac

4D

t,Ielt$t of

lsunb bortt

per owc

1D

iielntl,onrfrlp

betuacn rnrmbcr

of

lerabs

trorrr

aftsr

trsrnsfor

of

thneo ovel

and

n*tural wrrlatlon rstc 4l

44

4

4'

45

.17

1.

a.a

3.

TI ti$i$,A'tAL LAiS ^i;ItO

j

^{. '}

!.lrFSr:T OF LITI' .rl

.if/,it

r)lj oil ,fi\,'r{isi ldt}tc?}l

,il'D $xR.1l '{$IoiiT

t.

Gest;,tlon lsngth

2o

^{E!,:'th t:oluht}

i'Fi"l;cf

oi'

.;rJ(

g,:

_l,ir.$

fls

0:,..1A'i'Iu!f i.;.${iflt I'Prr il i

RI'.i

IrI'j;l?

to

iitlr.;lo-borrn I ^1gtbs

?. nll

lanbsr

"'5yf::i;"1',,r1;ll t,,gi,#' o.?uli?"* *

l. ;:in;lc-borfl I

rnbs

','1 $lI

liuobo

C0i,F,.'i'I'ff0,il

i':

li'i',,dti .l,i..i ^,!.1:,1' f

;Ill

Ll'.yJi:i

VII

^PO 'r$-li.'j:l'L

bliD

tirtt) ,T;i

-

.:.1^ri'jr)ilt ilI''

"l!;[ (]r i.r.i'll lHnIHi;

^{UIj;1T a'.lrD}

'.JijIriJ{T tl

.I}'

1.";;-i ,rAY

f.

lllnrtls-borrn Lanbs

f, d.Il

lanbs

i;fFElCT Ol" ^{j1.';T :,'i-rl}

',, i'$

L"'i{J ^G ?:lr}tYf'[..; Olf ,,i;,lr!{I},li.i ^,, i,;I

;;il'

.};J

iil;r:lrT 0Aill

i,uji ^.l}AT

Jlftilo*bcrn

liinnbs

r|ll

li,mbu

42

4P.

4?

4?

4]

4J

4.1

47

4l

48

{B 48 49 1r

i,a

Chaptier

VIII

P{sn .iI.,'liJ . .IOII

-

;,I1,10,.i,,")?.lf ,,rT'.LJI ,:i, _{ilrr; ,TlUlU., CTClrl,, ,}

jrit(;ilf _{::i'IOlX .

ji.

_{t)tf A}

0Lt,:AVACfi Oi'

F'it'!fll;.'ilig

flIA

li!; ,{Ii}.ttI.{L .'lti;A1'' j.,lff _{Ofr iJ E} . t,

lfil

^{trr jrrr;ir}

,-lVUlri'j'Iirfi _{.;,flJ rfE*i}

iUl$'IV,iL

O'

r:rirtll lallil(i;) ^(JVA

lJc:);{I! l': CAI'lx

:I,'Y

d1';liiit _i:i}CI ff:L{.'.;Jqur{

PRili.llrrT,t

!

L.i.'6 "i:trJ :'f*I

ID ;f-!l ^,i ! ¹

L

lA ^j

l]

^{0'i';, ;}

lil

sti.is:afiI

ILIS': ,il-,3t66.,

-

A,'i'.1.?!JJf CIil;i

ry

5O 5r) 5?

6r

62

5]

rt6 7o

7t

79 83

I5

tof

tI."ir

^rJ I' .J

L.,;i

Ia,blr

I

t

l

4

5

5

7

9

irlvcr.retgbt-r (k:;i

) of

^lto,rcruy

rud

tsL{ Tlro_t.ooth en+rg

ln th€ ir$rpurinnental

^porl6rl

.rffcot of

brc<:qi

of

ei,o on

thc

rnenife;ta.tlon

of

Oerrtnre

fOllowln,;

_ilro,g\. r-r.t, riii.jri trs.,tmcnt

Ilffeot of

^,.r.go

of

orie

on

the

nlinife..i ^tlon of

oe":tnrc

;',ffect of

^bneerrl

of

e',r.: en

the tlme

rnten .rl betr*een spon{€ rqtthrlr;.i

j.l

_{a*nd oestnrs}

.,ffeot of ge of

^gi,,t: on

thc tll.u,

int..rr"v.l b--twesn iJ.iion a$ .;lthdr. _{r;,.rl rn,.i ou} ,truo

lrffect ojl

..oso

of

i'.

ii. ..

_{"nr1 r,ia,Jr}

of tnjeotlon

Otl 0,.::;tPg11U CyCle len:trr

Cv.ift,rn tilrtpOt1.r|, qrf e,;g,; tO

tttl,:tnellt r;ttl

i'1 ^::1. , 1.

OT*fl.rlf

trarufornql

tt-;r,1Jolr..ir; rltrti.

.ftr:f . ..,. tf.*iitnant - lrffect of

doee o.!.'

i'r.

r.:,r oB

the

iioro:il.i.r,;.,.:

9f

ov.a fGOqVerOd and on

thu

psrol,lrt$de

of

r,jr:oVoFOd

ova

furtlliso,.i

_;)9r

r.ru (il t tr n;t'

n.od)

ihorte:rt

anrt

lon-F;i rnturv_:l

(irourg)

;rfter thr

onsot o{'

oe;tnrs to iirc

rri(tovorJ

of

^u -ch ols ;v.,,;e ,;ta.;e

I u;r,n

lntonriil ,rften the

rtngsi oj- os.rtruc to

n

oov',r?.

of

e.;ch cle,,rv,,,iu -jt:,;!€

,

ff,Jct of

^..ioiJe

,:!'

:

o

^o .,o Ofl

the

:;o.rn

ttrterval

(trourn) _frou: ^..,Ir$$t

o:' oe.jtnr; lo

ttrcoyi3l.y 9g egclr olo;rvia.. I.f ^:rta.je

,:,ffect Oi

Etr tuenti

;1

tRi,.,trncnt

r.ilth

!,1 ii..*r.

durln,; the

bfas"rtn.; ;.rc.,rlon iJn ov.;r.i,,;rn n3;J;:ong6 lilurnbcr,l

of

^,Jotpor.:

Iut.l;r :

l+{x.lrotorny

i

ft'eot ot' blrtlr r.dlr

on

,.lrnrl:tlon

_{r..rtr:, ..i.thln} bree*

of

^cyie

Itrf,Iueng+

of'

f,rcr;r .ir"cds un o,ruldNion

r.t6 -

3o:moy ewoa

llur:rbor

of

otr;r tn.no,rlant..t

Paqp

t17 f28 f23 tzB

t

ztl

t?g

t2)

fJo

flt

f l.t rl4

fJ4

fJo to

It

li.

r3

14

1'

fl5 f lrt

fJu r38

lu

t?

Ts,bIo

r8

2t)

?9 3o 31

l?

19

iraott

i';ffeot of

breod

of rooi;;lcnt,

brcod

4nt

rntrnber

of u,i;8 ir.njrforriuri, 'nd ;;tro cl

conoe;-rti6n

n,to follouln; tr.lnl.rfer f $

ljfftrot of

breerl

of ncot,tentr

bnoe,il

of

u,";.r atrd.

tlre

on ova

uurrlv.I

i.rr o-;sa ?roc€ldn,; .)nr)

ofii f

39

r.ff,eot

of

breott

of

r-rrctptent, breod

of

oi;

I

^;rnd

slre

on ova

.rurylv'l irr

€rre'

rooolvtrl,;

trrr"es

eg,;e f lg :.ffeot of

^brfotrrl

of rsol;rlent, bnoel

lnrt nu,:bor

of

sy,, rilrl ulfel

on ovi-

sunrlval - all crtg f

Jg

..ffoat of

nrutr:mrrl

cwl

cmbrlro (,;@notJpa on

ilotrttnrtion

_of,

lltt+:r

^,rizi:r

ln

Gr,e.i

ft;oeivin.l

ro

?l

22

:..1

24

?5

throo eg6.l

t''ultlplo tn,nsplants -

^s€corul

r.ffeot

_Of rnatt,:rnturl arxl cmbryO

wol6ht

of

larnb borrr

por

o$,0

in three

eg,o

OnrL;.tlon

ratr' at

l,r:iglr: t,ir4)"

eros

reoelvin,j thn:o

e ij!3

-

f40

tr'rnefer ettonpt f

4O

gunotype on the oides rsc€lvlnr;

f40

a"nrl

lltter slac tn

dab.a ;)re ,rn.,rnt Cres

on\r

2b i,fieot of llttor liao

on

g.;ota[on lonrth

anrl lalrb

birth uct iht

^(lcl. )

Laru:th

of

^g, frtii,!l{)n

(.irys)

_snrl

btrlh - olrvilo-bom

l,asb$

q

f4l

(rrr.ye )

t42

'ei,.;lrt

^{(t e. )}

f4l

43

4l

43

44

45

,i.s

J]

iiffrot of ocr of *ln;;le-born I

^mbs oD g{rdtatlon

lsrr.lth - (aqy") t

iax Clffofencos tn

},'Jnb

btrth reight f

ISLrth

uotftht

(t g.

) - twln

^anrf

tr{,plot-borrr l*.mbs f iiffcgt

of, r:iete$r.tl anit _l;untr g:enotype

on

;e*lt*,tlon

ler*fth (,f.'ys)

_{+rld },rmb}

btrth

^rol,,.,ht

(t,,.i -

sln :I6-bom l.unbr: f

r,jffoot

of

rn:rttim;;r| 6,61

lrvrl:

.fc.notype on ,;cot_.:tton Ienr.lth (cl;iyo)

^nt

^larrb

birtn

sefor"hl ^(*,.E.

j -

nll liunbs f

irtrth

uei

fts (fr;. ) for

^cl.rBses

of

ttrlrr-borrr

l;*rabe f

Dlffereno€s

tn

rnoan

btrth wel,;ht (k,ii

bctiooen ol,;gsog

of

twlr>borrr l;rnbs

34

f

^,tt,

f*rble

l3

pa.:it

ci,;bt ;rt

wsdlnin5 &m rrei,;ht ,1al,n

per

_Oqy (k6J.)

- sln,;lo, tv;ln

^and

irtplot-born larnba t N isx

{illlfengnot:s

In

liurrb ^woa,nin44

wel6ht t

47

,lffect of

:n_rt,:trrsl ,rrril l;Irnb j..inofupe antt eox

on

wtanin; rai:iht

-*rC .*tll._;nt

;i*ln por rtqr

^(tq:. )

-

3tn;qls-born lennb

a f

47

iJffeot of nuterral

.,nrl

|:r,b

6;p.rnot,ype and ncr on $e€Ln1&5

rol;ht

^;nnd wo:.ght

;*ln per

^tlnry

(tg.)

- all lanbs t

48

f rsfers to followl&f

pad€

l6

3?

]B

iill,,une

p.uxo

I

Etfc

lO3.

lll<nontfu-old tornnoJr

eue f

lB

2

iruc

1J3. f8-nonthol.r

i,.Jor_:or Leiocrrtr:r

r

,torurgJr

glro f

^1,3

I Exlrtirlnent,I ,>l;ut. Ir;,rt (,r)

Ifre Uruedfuel

,.,Gilgoll

26

4

1';r5ror.l,rnental

plan.

i,.-rrt

[b)

0b$onr,]tlr]ns _on

i,fggar\F tt

,

^!,ve

pur

_{llonney ewo}

f,.iqj

;r;ido

I f

lg

6

{iwe

14.4.

.tof;rnsy C:rc a.i.or;: p;xJ.e

rf+ f lg 7 ;iffoot

of, broo,i ,of ov,..r

on thu

t!.me rntonr.,.i

trtetween rporuB :.lthdrar,,ytrl -rnd

oeatnr; f

^2B

il Lffeot of

.-ge

of

€*e on

tlre tlno lntqnral

butyrGe[ rpon,J$ oithdril.,ral _;rnd

;re.ctrus t

^Zg

9 iiffeat of tho

nr.,,ber.

of

oorporir lutry;r _1)$r o1a$

on

thg

pefoijnt,,t{r:

uf

oV,, :trur)oVr:t-<}"i Li$d t}rc j.rerc{)nti*B$

Of

t.oi:.rtft.,trn

j

_Ollltr

l'ol.tlllsail

fror,

that cwe f Jl

10 rlffeot of tho

rnry:,ber

of corpllnl lutr,.,

plua

l;rf,,.io

folllole,;

_:)$r €..rr r:.

thc

uorocnL, ;,.

of

^ova,

rccovore ,:lxl ths

;roro:nt.,;e

of

&:c$vunr,i ovfjr

fortlllsed

J'rorri

th.i; evo f

Jt

|

| r,ff,tlct of the irrt";rV;rl

-:'rto,i. ong{}t

uf

oo,ltnrg

to

Iap,.rOtOqy Ori

tirs

i)€rcrjntdL.;r:

'lf

^oV* fr-:,.tr,vef€d,

ard the

perO_nt.r;;e

,if

r:.uirrle rr.:.!

()v f:rcl

..rood

.r'€r

tlHG t la

7?

^iie,iln

lntsrv*l ;ftt*n

r:nrlot

oi' orj.jinlo to

^th(}

rrooovery

of

ov,r closrv

is

^.t.l

;cs f

3,1

lJ iinf*rtllieo{i ovtri

reoovijr,J(l f

lf

hrur,r

;riitsr

onsat

of o.rtnr ln

^dono!

ano f j5

t4

?.-611 ornrm reocrrere{t oB houls

sfter

onset

of

ooetnre

ln

donor

sne f

35

u

^{,J-OOlL Ortu,ir} firEnrfostFd ?? nours

erftor

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