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Table 20. Genetic correlatlons among carc¿rss measurement.s and age to rnarket welght Tral-t Shoulder faE Back fat. Loln faË Total fat. Loin eye area Grade lndex Z Ham wefgh E Ham surface area Z Predlcted y1eld Àge Carcass length Shoulder fat Mfd-back fat Loln fat Tolal fat Loin eye area Grade lndex Z Ham welght Han surface area Z Predlcred yleld -0.17r0 .18 -0.0110.32 -0.24!0.L7 ]. 40r0.67 0.5610.18 L.42!0.58 -0.1410.16 -7.07!o.46 0.8810.06 0.1810.47 1 .5010. 53 -0.0110. 65 0 .9210.06 0 .5110.55 0.2L!0 .42 O.22!O.22 -1 . 0410 .13 -1 .5510 .71 -1 .3010.21 -1. 2510.18 -1 .0210. 91 0 ,0210 .1 7 -0.3610.24 -0.7610.4 9 -0.20!o.24 -0. 3510 .21 -0.19r0.42 0.6210. 30 -0. 6010 .16 -0.49!O.24 -0.6110.48 -0.1410. 24 -0.4610.20 0.64t0.32 o.L2!0 .32 0 .1610. 23 -0.43t0. 19 -0.86t0.14 -1.3010.53 -0 .5510.18 -0.8510 .10 0.2810.36 0. 78t0.20 0.3010. 24 0.8310.10 -0 . 27r0 .16 -0.6110.28 -0. 9610 . 5B -0.18r0.19 -0.57!0,22 0.1210.38 0.79t0.4? 0.1310.24 0.3310.23 0.5510.25 L¡I O
51 to phenotypic correlations in most cases although the genetic correlations were higher. Several values outsíde the theoretical range (rG , 1 o, tG ' - 1) were found, i.e. mid-back fat with shoulder fat, loin fat and total fat, carcass length with loin eye area, grade índex with three back faË thickness measurenents and total fat thickness and loin eye area' mid-back fat with percent predÍcted yíeld. coefficients are high in standard error. Most genetic The back fat thÍckness measurements at three different points were highly positively correlated with each orher. A si_milar finding has been reported by smith et a1. (L962). selection for 1or¿er back faË thickness at one location will reduce thickness at other areas and average back fat. Carcass length had moderately negative correlations with shoulder fat, loÍn faÈ, total fat and age to markeË weight. The correlations betr¿een carcass length and ham surface area and percent predicted yield were highly negarive. snith er a1. (Lg62), smith and Ross (1965), Jensen et al. (1967), Flock (L970), siers and Thomson (L972), Enfield and I^Ihatley (1961) and Roy eÈ a1. (196g) also showed that negarive correlatÍons existed between carcass length and carcass back fat and percent lean cuts. Loin eye area was positively correlated Ì,¡ith loin fat which suggested that selection for lower back fat at loin would reduce loin eye area simultaneously. This result is not in agreement wÍth reports from previ-ous research. Percent han weight \474s negatively correlated with a1l three back fat thickness measurements and 1oÍn eye area and the values ranged from medium to hÍgh, but it was positively correlated with ham surface area,
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: ,o AJ et 41. (L969), Roy er al. (19
Page 63 and 64: 53 SI]MMARY AND CONCLUSION Data fro
Page 65 and 66: 55 also improve Ëhe others where s
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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