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

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Standard error
(Becker, L967):
of heritability
was estim¡ted as follows
s. E. (n3) =
where S
abilÍty
t=
2
o^
22
os*ow
2 (n. -1) (1-r) 2 (r*(x-r) .)
2
x2(r,.-s)(S-1)
,
E. (h:) is the standard error of the esiimate of heritt
is the intra-class correlation
S and K are as previously defined.
2. Phenotypic and genetic correlations among the traits were calculated
from analysis of variance and covariance (Falconer, 1960). The
form of analysis of covariance is given in Table B.
Table 8. Analysis of covariance
Source of variation
d.f.
Mean cross
products (MCP)
Expected mean
cross pröducts
Among years
Y-1
MCPY
A-ong groups/years
G-Y
MCP^
\J
Among s ires/groups/years
S_G
MCPS
cov" * K cov,
Among litters within sires n.-S
MCPI{
covw
a. Phenotypic correlation between
estimated as follows:
traíts x and
(r , .)was p(>n'