Íslenskar landbúnaðarrannsóknir - 01.03.1970, Side 35

COLOUR INHERITANCE IN ICELANDIC SHEEP 33
TABLE 8
Test for genes for white markings among 4 white sons of ram No. 01097.
Nonwhite progeny only included
Ram No. White markings in ewes Total
Absent Absent, known heterozygotes Present
White markings in lambs
Absent Present Absent Present Absent Present
01117 13 0 0 0 0 0 131)
01118 10 0 1 0 0 0 11
01119 5 0 0 0 0 3 82)
01120 5 0 0 0 5 0 10
1) Includes 5 nonwhite lambs out of nonwhite ewes showing patterns, not included in
table 7.
2) Includes one lamb from a black ewe, not included in table 7.
CHAPTER IV
Collection of data from flock book
A. DESCRIPTION OF FLOCKS
Simultaneously with the series of experi-
ments described in the previous section,
measures were taken to collect additional
information on tlie colour inheritance
from flock books where records of matings
and colour descriptions were known to
have been made witli care.
In some cases it was felt that prepara-
tion of all available records from a given
flock for analysis would be worth while,
whereas in other flocks only information
about progeny of certain sires and dams
was found to be of interest.
A pilot study of the systern used for col-
lecting information and transferring it to
punched cards for analysis was made in
1960 using all records since 1953 on farm
No. 4.
In 1961 all the records since 1952 from
the experimental flock at Hestur and all
the records from farrn No. 5 were also pre-
pared for analysis and transferred to
punched cards. These records were punch-
ed directly frorn the flock books. Then the
cards were run through an interpreter and
the contents printed in a line at the top
of each card. The interpreted cards were
then checked against the flock books and
all faulty cards replaced by corrected cards.
For the record year 1961/62 only informa-
tion from the experiments at Hestur in
that year, described previously, was punch-
ed on cards. At the same time the records
from the experiments carried out at farms