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54 fat and loin fat), total back fat thíckness, grade index, T" ]'am weight and ham surface area \¡/ere moderaËely heritable. The heritabilities of carcass length, loin eye area, "/" preð.icted yield and age at 90 kg live weight were high and ranged from 0.53-0.62. Moderate and high response would be expected from selection of those traits. phenotypic and genetic correlations vrere calculated from analysis of covariance. Phenotypic correlations of carcass length with three back fat thicknesses, loj-n eye area, ham surface area and age at 90 kg live weÍght r{ere negatÍve but smaIl. The phenotypic correlations among three back faÈ thicknesses were positÍve and intermediate. Loin eye area \¡/as negatively correlated i¡Íth three back fat thicknesses but was positively correlated with grade index, T" ]r,am weight, ham surface area and % predicted yield- Grade index was highly negatively correlated r¿ith three back fat thicknesses and was positively correlated r¿ith Z :ham weíght, ham surface area and % predicted yierd. Ham surface area 'sas negatively correlated ¡¿ith back fat thÍcknesses and "/" :ham weÍghË but was positively correlated with Z predicted yíeld. Phenotypic correlations of age at 90 kg live weight r¿ith three back fat thicknesses Trere negative but sroall. The relationship of age at 90 kg rive r^¡eight \^/ith ham surface area and "/" predicted yÍe1d was positive. Genetic correlatíons among carcass measurement and age at ng ut live weighÈ generally behaved siurilarly to the phenotypíc correlations but v¡ere higher in rnagnÍtude. Most of the genetic correlations had hÍgh standard errors. In conclusion, most carcass traÍts \,Jere each other whÍch indicates that selection for favorabl-y correlated with one carcass trait would
55 also improve Ëhe others where several carcass traits \,rere considered simultaneously in a breeding program. The relationshipsbeiween growth rate i.e. age at 90 kg líve weight and carcass traits r¿ere unfavorable.
Page 1 and 2:
ESTIMATION OF GENET]C AND PHENOTYPI
Page 3 and 4:
ACKNOI^rLEDGÐ{ENTS The author wish
Page 5 and 6:
iÍi carcass length,77.22!2.47 cm¡
Page 7 and 8:
TABLE OF CONTENTS Page B. Carcass m
Page 9 and 10:
va1 LIST OF TABLES Table Page L7 Me
Page 11 and 12:
INTRODUCTION The heritabilíty of t
Page 13 and 14: granddaughter on granddam. The heri
Page 15 and 16: Table 1 (Contlnued) Tralcs a n Meth
Page 17 and 18: 7 r^/ith the number of pigs born al
Page 19 and 20: Table 2 (Contlnued) TraÍtg h2 Meth
Page 21 and 22: 11 as 0.31 and 0.40 by Edwardsand O
Page 23 and 24: 13 and backfat thickness r^7as nega
Page 25 and 26: Table 3. Managra breed development
Page 27 and 28: L7 Adjusted Y, = Y. - b (Xt-X") whe
Page 29 and 30: 19 9) 'PercenË Ham I{eight The pro
Page 31 and 32: 2I Table 6, Regression coefficients
Page 33 and 34: a') variance is given in Table 7. T
Page 35 and 36: 25 where: "ott(*y) 2 ã: "r(x) = to
Page 37 and 38: ¿/ l. Heritability estimates - The
Page 39 and 40: 29 Standard errors (S.E.) following
Page 41 and 42: 31 tots (*v) toto(*y) = totw(*y) =
Page 43 and 44: -f1 RESULTS AND DTSCUSSION A. Repro
Page 45 and 46: Table i-2. Means and standard devla
Page 47 and 48: a1 Table 13. Estímated heritabilit
Page 49 and 50: Table 14. PhenotypÍca and geneticb
Page 51 and 52: 4L Table 15 - Means and standard de
Page 53 and 54: 43 Table 16. Means and standard dev
Page 55 and 56: 45 Most of the heritabilities deriv
Page 57 and 58: 47 moderately heritable while carca
Page 59 and 60: ,o AJ et 41. (L969), Roy er al. (19
Page 61 and 62: 51 to phenotypic correlations in mo
Page 63: 53 SI]MMARY AND CONCLUSION Data fro
Page 67 and 68: 57 Flock, D.K. 1970. Genetic parame
Page 69 and 70: APPENDIX s9
Page 71 and 72: Appendix rr. Anal-ysis of covarÍan
Page 73 and 74: Appendlx rrr' Ànalysfs of varlance
Page 75 and 76: Appendlx IV (Conrinued) Mean cross
Page 77 and 78: Appendlx IV (Conrlnued) Mean cross
Page 79 and 80: Appendlx IV (Contlnued) Mean cross
Page 81 and 82: ^Appendix IV (Continued) Mea4 cross
Page 83 and 84: Appendix IV (Conctnued) Mean crosà
Page 85 and 86: 75 Appendix V. Table of differentia
Page 87 and 88: 77 Appendix VI. (Continued) Body wt
Page 89: 79 Appendix VI. (Continued) Body wt
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