Estimation of genetic and phenotypic parameters in a closed ...

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1B 2) Carcass Length Carcass length r,ras Ðeasured as the distance between the Íore-edge of the first rib and the fore-edge of the aitch bone section on the cold horizontal carcass. 3) Maxímum Shoulder Fat Ttríckness Measured in nrm at the point of maximum thickness over the shoulder. 4) Ilinimurn Mid-back Fat Thickness Measured i¡ rrrm at the point of minímum thickness over Lhe back. 5) Maximuro Loin Fat Thickness Measured in nrm at the point of maxjrnum thickness over the lumbar region. 6) Total Fat Thickness Total fat thíckness measurements from shoulder, nid-back and loin aree-, i.e. sum of measurement.s 3, 4 and 5. 7) Loin Eye Area The logissimus muscle was sectioned beÈween the 7Ëh and BËh vertebrae and its area measured using a planÍmeter. B) Grade Index Carcass grade index Lras according to the Table of Differentials from Canadian Hog Carcass Grading/Settlement System provided by the canadian Pork council. The Table of Differentials is shown in Appendix V.
19 9) 'PercenË Ham I{eight The proportion of ham in total iøeight of the side. The ham is detached at a point 5 cm ahead of rhe foreedge of the aitch bone section and at right angles to the 1ength.line. 10) Harn Surface A.rea Lean area over the ham measured in .*2 .rrd traced by a planiueter. f1) Percent Predícted Yield of Trirrmed Cuts The formula used for this calculation is: y = 51.68 - (I.273x, - 0.161x, - 0.485x, - 0.B27xO) wherei y = predicted yield (Z) xl = total backfat thickness in rr¡m x, = loin area ín sq. cm *3=%hamweight x, : ham surface area ín sq. cm 4' All factors are corrected for sex and carcass weight. L2) Aee to MarkeË trrleight Nurnber of days to market weight was adjusted to a 90 kg liveweight basÍs followi-ng the Canadian ROP home test program procedures. The adjusÈrnenË factors are shovm in Appendix VI. A-ll of the above measurements except grade index, percent predicted yield and age to market weight were adjusted for carcass weíSht
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: L7 Adjusted Y, = Y. - b (Xt-X") whe
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 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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