Íslenskar landbúnaðarrannsóknir - 01.03.1970, Síða 70

68 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
TABLE 28
Classification of singles and twins according sex and colour
Sex Colours of lambs Proportion of white
White Nonwhite Total
Singles Males 3498 509 4007 0.873
Females 3489 584 4073 0.857
Total 6987 1093 8080 0.865
Twins Males 3547 836 4383 0.809
Females 3464 899 4363 0.794
Total 7011 1735 8746 0.802
Singles and twins Males 7045 1345 8390 0.840
Females 6953 1483 8436 0.824
Total 13998 2828 16826 0.832
TABLE 29
Comparison of proportions of wliite lambs according to tlie classification
in table 28
DF X2 Probability
Between sexes:
Within singles 1 4.601 0.05 > P > 0.02
Within twins 1 3.203 0.10 >P> 0.05
Sum .... 2 7.804 0.05 > P > 0.02
Singles and twins combined 1 7.196 0.01 >P> 0.001
Het. between singles and twins 1 0.608 0.50 > P > 0.30
Between singles and twins 1 119.624 P< 0.001
as described by Harvey (1960) was applied.
A back solution for the absorbed constants
was then obtained by using the procedure
described by Goulden (1952).
Several analyses of variance were carried
out in order to examine the relationship
between colour genotype and fertility.
Comparison of all available genotypes of
ewes among 2 year old ewes was made with
respect to number of lambs per ewe lamb-