Estimation of genetic and phenotypic parameters in a closed ...
Estimation of genetic and phenotypic parameters in a closed ...
Estimation of genetic and phenotypic parameters in a closed ...
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a')<br />
variance is given <strong>in</strong> Table 7.<br />
Table 7. Analysis <strong>of</strong> variance for litter<br />
size<br />
Source <strong>of</strong> variation<br />
Among years<br />
d"f.<br />
Y-l<br />
Sum <strong>of</strong><br />
souares<br />
(SS)<br />
tt"<br />
Mean<br />
square<br />
(MS)<br />
*t,<br />
Expec ted<br />
mean<br />
souare<br />
Among groups/year<br />
G-Y<br />
SS^tr<br />
MS^<br />
\J<br />
Among sires/group/year<br />
Litters r¿ith<strong>in</strong> sires<br />
S-G<br />
n.-S<br />
'S,<br />
ssw<br />
"ts<br />
MS_.<br />
l^/<br />
"'r*""3<br />
2<br />
oüI<br />
where Y = mrmber <strong>of</strong> years<br />
G = number <strong>of</strong> farrow<strong>in</strong>g groups<br />
S = number <strong>of</strong> sires<br />
<strong>in</strong>Y vears<br />
n. = total number <strong>of</strong> litters<br />
<strong>Estimation</strong> <strong>of</strong> variance cornponents:<br />
<strong>of</strong>r = us"<br />
o!:ts,-rr"<br />
where K =<br />
*<br />
^2 Àn.<br />
n.- l-<br />
n.<br />
n.<br />
l_<br />
number <strong>of</strong> litters<br />
from the Íth sire<br />
Heritability<br />
follows:<br />
h3 =<br />
4"3<br />
22<br />
os * oIn,<br />
estimated from the síre component<br />
(Falconer,1960) as
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