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Last updated:
16 Sep 2008

Teun v/d Dool
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Statistical Influence of ROM Dogs in the ISDS Border Collie Population

In an earlier article ('Statistics from the Stud Books') the key dogs where identified as the dogs with the strongest genetic influence on the current population (current population = dogs born during the last 5 years). The question could be raised if the key dog statistics would change if both parents of each founder or ROM dog (Registered On Merit) would be known. Founders or ROM dogs of a population are dogs of which one or both parents are unknown. For this purpose the statistics of the founders were retrieved from the database. They are displayed in the table below.

To calculate the maximum influence of the ROM dogs on the current population suppose that each of those 'founders' has the same parents. This is impossible because such a dog would have to live over 50 years, but it gives an upper limit to the influence. The total influence on the current population is then the sum of 'Total Unreg x Mean Influence' divided by two (because a single parent contributes only half of its genes to its offspring). We exclude the first two volumes (1947 and 1948) because they mainly contain unregistered dogs. The sum for all other years is 0.16%. This is negligible compared to the identified key dogs which have at least 2% influence.

So the statistics are accurate from 1949 onwards. The only change in identified key dogs could come from additional information of dogs born before 1949.

Year	Total ROM	Unreg. ROM	Unreg. Other	Total Unreg.	Total Reg.	%Unreg.	%Mean Infuence
1947	0	0	1453	1453	3029	47.97	0.0190
1948	0	0	1275	1275	3003	42.46	0.0237
1949	6	6	15	21	650	3.23	0.0006
1950	7	7	3	10	850	1.18	0.0030
1951	8	8	3	11	775	1.42	0.0010
1952	1	1	3	4	875	0.46	0.0003
1953	7	7	1	8	850	0.94	0.0025
1954	3	3	1	4	875	0.46	0
1955	11	11	0	11	925	1.19	0.0018
1956	2	2	0	2	1050	0.19	0
1957	1	1	3	4	1150	0.35	0.0080
1958	1	1	6	7	1049	0.67	0
1959	3	3	3	6	1050	0.57	0.0001
1960	3	3	3	6	3175	0.19	0
1961	6	5	1	6	3225	0.19	0.0006
1962	8	1	6	7	4250	0.16	0
1963	17	13	0	13	4250	0.31	0.0004
1964	10	9	0	9	4192	0.21	0.0001
1965	13	11	0	11	4600	0.24	0.0032
1966	13	10	3	13	4500	0.29	0.0003
1967	20	18	0	18	4900	0.37	0.0001
1968	7	4	7	11	4800	0.23	0.0001
1969	4	3	4	7	4400	0.16	0.0006
1970	7	4	0	4	5900	0.07	0.0001
1971	9	8	1	9	5750	0.16	0.0010
1972	3	3	0	3	5001	0.06	0.0001
1973	0	0	3	3	6500	0.05	0
1974	0	0	4	4	6001	0.07	0.0004
1975	0	0	11	11	5831	0.19	0.0005
1976	7	6	22	28	6670	0.42	0.0012
1977	2	1	0	1	4325	0.02	0
1978	6	4	1	5	6349	0.08	0.0003
1979	7	4	0	4	5897	0.07	0.0006
1980	2	2	0	2	6599	0.03	0
1981	14	6	0	6	6644	0.09	0.0007
1982	9	9	0	9	6621	0.14	0.0007
1983	12	8	0	8	6686	0.12	0.0004
1984	9	6	0	6	6729	0.09	0.0002
1985	13	9	0	9	6881	0.13	0.0005
1986	9	9	0	9	7176	0.13	0.0008
1987	11	9	0	9	6595	0.14	0.0002
1988	14	10	1	11	7091	0.16	0.0010
1989	8	7	0	7	6709	0.10	0.0002
1990	10	7	0	7	7215	0.10	0.0029
1991	11	9	0	9	6584	0.14	0.0005
1992	11	5	0	5	6074	0.08	0.0006
1993	11	8	0	8	6304	0.13	0.0007
1994	10	4	0	4	5529	0.07	0.0002
1995	9	5	1	6	6116	0.10	0.0004
1996	5	5	0	5	6263	0.08	0.0003
1997	13	9	0	9	6186	0.15	0.0003
1998	9	5	2	7	6158	0.11	0.0003
1999	12	11	0	11	5609	0.20	0.0005
2000	9	7	0	7	5733	0.12	0.0001
Year	Total ROM	Unreg. ROM	Unreg. Other	Total Unreg.	Total Reg.	%Unreg.	%Mean Infuence
Table 1. Statistics of dogs with one or both parents unregistered or unknown. * Year: Stud Book year of publication. * Total ROM: The total number of 'Registered on Merit' Dogs. These do not only include the dogs with one or both parents unregistered but also dogs that were registered a couple of years after their date of birth. * Unreg.ROM: Number of ROM dogs with at least one parent unregistered. * Unreg.Other: Dogs with at least one parent unknown because of missing information in the Stud Books. * Total Unreg.: Unreg.ROM + Unreg.Other * Total Reg.: The total number of dogs registered in the Stud Book of that year. * %Unreg.: 100 x (Total Unreg.)/(Total Reg.) * %Mean Influence: The average influence of the 'Total Unreg.' dogs on the current population (dogs born in the years 1996-2000).