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Titolo:
Inbreeding and effective population size of Japanese Black cattle
Autore:
Nomura, T; Honda, T; Mukai, F;
Indirizzi:
Kyoto Sangyo Univ, Fac Engn, Dept Biotechnol, Kyoto 6038555, Japan Kyoto Sangyo Univ Kyoto Japan 6038555 t Biotechnol, Kyoto 6038555, Japan Kobe Univ, Fac Agr, Kobe, Hyogo 6578501, Japan Kobe Univ Kobe Hyogo Japan6578501 v, Fac Agr, Kobe, Hyogo 6578501, Japan
Titolo Testata:
JOURNAL OF ANIMAL SCIENCE
fascicolo: 2, volume: 79, anno: 2001,
pagine: 366 - 370
SICI:
0021-8812(200102)79:2<366:IAEPSO>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
OVERLAPPING GENERATIONS; CROSSBRED WAGYU; SELECTION;
Keywords:
effective population size; generation interval; inbreeding; Japanese Black;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Nomura, T Kyoto Sangyo Univ, Fac Engn, Dept Biotechnol, Kyoto 6038555, Japan Kyoto Sangyo Univ Kyoto Japan 6038555 ol, Kyoto 6038555, Japan
Citazione:
T. Nomura et al., "Inbreeding and effective population size of Japanese Black cattle", J ANIM SCI, 79(2), 2001, pp. 366-370

Abstract

The objective of this research was to estimate the amount of inbreeding and effective population size of the Japanese Black breed using pedigree records from bulls and heifers registered between 1985 and 1997. Inbreeding wasquantified by three F-statistics: actual inbreeding, inbreeding expected under random mating, and inbreeding due to population subdivision. During the period of 1985 to 1997, the inbreeding expected under random mating increased from 2.3% to 5.0%, whereas the increase of actual inbreeding was more gradual (from 4.7% to 5.4%). The inbreeding due to population subdivision decreased almost linearly and reached 0.5% in 1997, indicating that genetic subdivision of the Japanese Black cattle population has essentially disappeared The effective size of the breed was estimated from the increasing rateof inbreeding expected under random mating. In the earlier half of this period (1986 to 1990), the breed maintained an effective size of approximately 30. However, after 1991 the effective size sharply decreased and the harmonic mean between 1993 and 1997 was only 17.2. The main cause of this reduction of the effective size was considered to be the intensive use of a few prominent sires. To increase the effective size, an upper limit in the use of AI semen per sire should be imposed.

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Documento generato il 24/09/20 alle ore 01:33:17