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The influence of importations on the New Zealand pedigree Jersey breed and the level of inbreeding, 1895-1950 : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science of the University of New Zealand

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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.

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THE INFLUENCE OF J:MPORTATIONS ON THE

NE'ii ZEALAND PEDIGREE JERSEY BREED AND THE LEVEL OF INBREEDING 1895- 1950

A THESIS

Presented in partial fulfi l ment of the I'eq_uirements

for the degree of

Master of Agri cul t ural Science of the

University of New Zealand

by

Giri sh Manilal Jhala December 1 952

(3)

..

,,

INTRODUCTION

HISTORICAL ASPECT OF JSRSEY IMPORTATIONS MATERIAL AND MZTHODS

Sam;;lins of 1-ornJ 8tions

sarnvlin�:� i11c i vidu.c.l pedigrees

INFLUENCE 0:? It.IPOrt'l' -�TIOHS ON '.LI-IE NEu ZEALAN".lJ JERSEY BREED

In�ortance of individual Enimals

Page

1

3

6

6 8

12 16

21

The estimation o� 'c�rrcnt' inbreeding 23

•rhe estimation of 'non-curr'ent' inbreeding 25

The estimation of 'long-term' inbreeding 26

The estimation of inbreeding due to development

of 'strainst 27

IMPORTATIONS AND ':(lfi>:b; CLi�.SSIFICA'riON SUMMARY

ACKNOWLEDG EMEN'l' S BIBLIOGRAPHY APPENDIX I

List of impoPted bulls

List of imported cows APPElWIX II

Bull importation standards Female importation standards

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i i xiv xxiv xxiv XXV

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