• No results found

of stocl: including incroc.8ec in l ength of lactation and undefined

:f'acturs

Total Increase 1920 -

43

Est imat ed

%

lbs. increaae of 2 8

16

2C

35

61

lbs.

3.

3

13. 1

26. 2

42. 6

57. 4

100. 0

- A.L� or N& z. Dairy Board,

CJ,.

943

}

S inc e i t had b een tucitly c.ssumed by

many

- 4'7 -

due t o e.n i!ltT• I'OV�Jment j_n the n;Eme t i c r:1eri t o f the nat ional

l; ero , th 0 concJ us i on� q� the sut- � rJrnTti ttee were of great

l. 1 1--

)

• t • ):"' . n ... \._, t \ •T " , t. ' . They l.'J"ere a s follows : ·;:he rr,t e <J f irnJ:) rovcmcnt in p er cow production has gradually dimini shed ovor the p a s t twenty years and is t'Lt .r r e R nnt prnc t i call�· :;t � tt i :Jnr: r;Jr

The observed imp::i.,ovement in p er cow production

111. J'Tfr:v z co.l ond d.nce 1920 han been mainly due to improved feeding due to

tcrpdressing,

bet ·ter pasture management ,

conservR t i on �f Ed.(U t i onal wint er feed and the l ike , with its a s soc iated increase in l ength of lectut i on end to the

rnp i d change in the br•cerl com;,�osi t ion of herds, rather than

AO

selection and el imination of low producers.

'l'he improvement p o s s ible on the basis of

s el e ct ion nf re11l 8 c ement s fron the higher p roduc ing dams i s ver

y

slow due to :

( 1)

Regress ion o f (�ushtcrG to w&l"d the mean - on the

average only 15� of the dum' s advantb.ge

(

over the

he:rd nverFtGO)

i c 1-HJ.srv-):'l on t0 the p rogerzy.

( i i )

Heavy cull ing for disease nec e ssitat es saving

ar--nroxim::..,; t elzr one-thircl of rcj_Jlo.cement s from cows

below

the herd averugo.

( i i i ) Rn:�:i(1

c:� nn n i on in heJ:>d- nunb ors by approximately

l , 000 , 000 cows s inc e l�JO has 1'ur ther l imited the 13 C 1)p C f'.VHi l uble fo!' S t.,l e c t lon.

( iv)

Not more than 00;�.� of' c ows huvo ever b e en t ested and thero:foro two- thirds of' farmers do not ltnow which are their highest produc ing cows.

The fnrmcr ho s therefore b e en rel i ant up on the herd sire

as

the

chi ef

means of ensuring that herd replacements v1ill b e of nup er ior

produc ing

abil i ty to the cull s they repl a c e.

The 1078

sire

ourveys conduct e d t o date indicate that only one in three of the bull s surveyed has irqproved

product i on in th e hE!rd in whi ch

he has

b e en used, and the net re sul t is that

the s e

bUlls

have

b een compl et ely unable to improve product ion.

• • • • • • � • • • � • • • • • c

we bel i cv9 that the pres ent posi t i on hae ari sen

b ecause

the

grade herds in

which these

bull s have been used now approximate the same l evel of product ion as the p edigree s tock from which the horcl sires are drawn.

'l'ho difficu.l ties confront ing the p edigree

breeders in utterrw t ing to rui n e pl·oduct i on hCl.Ve been

f'l irnll ar to those of the grD.d o herd, but compl i cat ed by the

y cuigroe breeders ' uual all egiance to typ e and ance stry

as well na p cr.fol"'l'i.W.nc e} and his roluct81lce to cull

rigorously on o bas i s or p er:t·o�co,

The ff',ct s c1i selo o o r� very

cli s g_ukt ing

position

in the industry , and one which cun b e v i ewed with

c omp l a c ency by ne i ther the Indust ry nor the Breed

Soc i e t i e s conc erned.

In assessing tho irap ort ance o:f her

d

recording in the p roduct i on increa s e under discussion,

it

should not be overlooked, howe

v

er, thut r

·

ecordl:ne had b e en concerned in

more than mel"ely indi cat ing which cows to cull and f'rom which

'

cows t o b r e ecL I t hud played nn impo1�tant lJH.rt in indi cating the superiority

of the

sp ecial i s t dairy breeds over dual

- - -

In adlU tion, recor<lil'l(., hu.d. l.> e cn c..r.�. im.flOl't t:.nt .rc. ctor in inducing

f

armers

to

ylt...:n.o or nutrit i on 0f th ciJ.' hc.r·cl::J .

'.i.'hc ::ut-co;:D.Ii L t e e , in t.hcir re-.)ort , made

a

\;i th thf.J

�1l1j

cct of rap iclly

increas ing

the r.�.vcrnr.o :prouuct i .Jn of p e digree sto ck ·�he Breed

soci o t iea were

urged:

1. T o fos t er "th e u::1o of' "r1�oven'' nircn in p e digree

herds.

�. T o cnf'orcu :J cl o cti vo l

..

e::; i ·:;trat ion on the ba s i s of

p crfornanc c.,

3, 'l'o obt ain ,.rnive.C'f.Hl r<;cordine

in :.) cclie1•ce herds,

allowing the mv-.acr t0 exclude an.;1 cow from the annual herd average

on13• on cs.nc cll o t ion of i t s rer:ti stration.

For

improvement

in gr&de herds the r�� ort recomme�ed:

1. The s

u

rvey

i

ng of as l al'"ge a p roport i on as p

o

ssibl

e

of herd

s ires wr.il e the

s ires

were still l iving, and the widespread use

by

artificial inseminat ion

of

th

e

b e st proven

sires

in

grade , and p art icul arly p edigre e herds.

2.

co

nt

i

n

uous recording of

a high

proport ion of

herds with

i

ndi

vidu

al i dentific at ion of heifer c alves to

f

acili

t

ate

s ire

survey.

3.

The

publ icat ion

o� all official sire sUl�veys irresp ective

of the r

e sult

s

.

It

was

considered that educat i

on and p

u

b

li

ci

ty were

:f"undamental

to

the su

c c

ess o f the scheme and sp ecifi c reconrnendations were

made for the

provi sion

of' bull e·t inG , films , l ectures and demonstrat ions to fult'il thi s need

(

�,r. Zc

:uail'""J Board, 1943 ) .

( d) �(_ho

Since

one iTl'tnediate result of the Herd Recording council ' s 1943

Report

was the greater attent ion

focuaaed

on artif'ictel 1nseminn.t i on r..s a

factor in herd

improvement.

work had al rec dy b een

c ommenced.

at Masoey

hgricultural C

olle

ge

nnd Rualcura .Animal R e search Stat i on. Probl ems

of

te

chn

i

qu

e

,

at least in the local appl icat ion

of

art i ri c i al inseminat ion,

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