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

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Most of the heritabilities
derived from the dam components Ìùere
higher than those from the sire components. The hígher heritabílity
estimaËes from dem components are possibly due to maternal effects.
The heritability estim¡¡s for carcass length was hÍgh at 0.62
2
(hi*o) and fel1 within
The herÍtabÍlities
the range reported from other researchers.
for three individual fat thickness measuremenËs
and total back fat thickness were íntermediate and in good agreement
with values reported by Flock (1970), siers et al. (L912) and
Roy et a1. (1968) but were considerably lower than the reports from
SnÍth et al. (L962), Jensen er al. (L967), Anganosa er al. (f969),
Enfield and Whatley (1961) and Fahmy er at. (f970).
The heritability
of ioin eye \"ras .53 and was ín close agreement
r¿ith the estimates reported by Flock (1970), Jensen et al. (L967),
Arganosa et al. (1969), smith and Ross (1965), Enfield and LÏhatley
(1961), Fahmy et al. (1970) and Roy er al. (1968) bur was higher rhan
the estimete of 0.35 by srníth et al. (1962) and r^ras lower than the
estimate reported by Siers eË al. (L972).
The percent ham weight of c.arcass side weight rnras moderately
heritable and the value estim¡lsd from the presenË study was in agreement
wíth other reports.
The herj-tability
of ham surface area, percent predicted yield and
age to market weight were 0.41, 0.56 and 0.59, respectively.
The
estimatiorsfor these Ëraits were slightly higher than the values reported
in the literature.
In conclusion, Ëhe traits of carcass shoulder fat Èhickness, midback
fat thickness, loin fat thickness and the percenË ham weight were