Prevalence and Allele Frequency Estimation of Bovine Leukocyte Adhesion Deficiency (BLAD) in Holstein-Friesian Cattle in Japan
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概要
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Blood samples from 796 Holstein dairy cows in 20 herds from 6 districts in Japan from June 1994 to August 1995 were examined to determine whether they were BLAD-free, BLAD carriers, or BLAD-affected by use of DNA-polymerase chain reaction (PCR) analysis. The usage of semen of confirmed BLAD-carriers for artificial insemination in the Hokkaido district and two selected dairy farms was examined to estimate the gene frequency of BLAD carriers of sires. BLAD-carrier prevalence in 20 herds (796 cows, over 2.5 years old) ranged from 0 to 23.5%, and the mean BLAD-carrier prevalence was 8.1%. The BLAD-carrier prevalence in 10 herds (363 cows) in which the occurrence of BLAD was not detected by the DNA-PCR test ranged from 0 to 12.5% with a mean of 5.4%. The BLAD-carrier prevalence in 10 herds (433 cows) in which the occurrence of BLAD was confirmed by DNA-PCR analysis ranged from 2.6 to 23.5% with a mean of 10.8%, and these values were significantly (P<0.05) higher than those of dairy herds in which the occurrence of BLAD was not detected. The age distribution in BLAD carriers in these cows ranged from 2.5 to 11 years. The mean gene frequencies of BLAD among 796 cows from 20 herds and 433 cows from 10 herds in which the occurrence of BLAD was detected were 0.041 and 0.054, respectively. The proportional usage of semen of BLAD carriers for artificial insemination in the Hokkaido district in 1992 was 12.6%, and its gene frequency was 0.058. On two selected farms in which higher BLAD-carrier rates were detected, the prevalences were 35.5% and 25.8%, and their gene frequencies were 0.177 and 0.129, respectively. The occurrence of BLAD-affected in Holstein dairy cattle was estimated to be 0.16-0.31% at birth in Japan without genetic control.
著者
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NODA Hiroshi
Department of Legal Medicine, Kinki University School of Medicine
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NAGAHATA Hajime
Department of Animal Health, School of Veterinary Medicine, Rakuno Gakuen Univeristy
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MIURA Takeo
Department of Animal Health, Faculty of Veterinary Medicine, Rakuno Gakuen University
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TAGAKI Kenji
Department of Animal Health, Faculty of Veterinary Medicine, Rakuno Gakuen University
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OHTAKE Megumi
Department of Animal Health, Faculty of Veterinary Medicine, Rakuno Gakuen University
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YASUDA Taichi
Tanba Branch Clinical Center, Hyogo Agricultural Mutual Aid Association
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NIOKA Kotose
Souya District Agricultural Mutual Aid Association
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