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½Þ°¦°Ê±¡¯À±µ¨ü¾¹(Estrogen Receptor, ESR)°ò¦]®y¦ì©ó²Ä¤@¹ï¬V¦âÅéµuÁu¤W¡A¨ã¦³¨â­Ó¹ï°¸°ò¦]A©MB¡C¤åÄm³ø§i«ü¥X¡AESR°ò¦]«¬¬°BB¤§¥À½Þ¸ûAA«¬ªÌ¡A¨C­L¤À§O¥i¦h¤À®Y1.5»P1.0ÀY¥H¤W¥J½Þ»P¬¡¥J½Þ¡A¬G¥ç±NESR°ò¦]®y¤§B¹ï°¸°ò¦]ºÙ¬°¦h²£°ò¦]¡C¥»¸ÕÅçÀ³¥Î³æÂI®Ö苷»Ä¬ðÅÜÂI©îÂ÷¦¡»E¦Xþª³sÂê¤ÏÀ³(MS-PCR)§Þ³N¡A°w¹ï¥xÆW¦a°Ï¤K®a¥Á¶¡ºØ½Þ³õ»P¤­­Ó¸ÕÅç¬ã¨s³æ¦ì¤§ºØ½Þ¡A¶i¦æESR°ò¦]«¬³{¾÷ÀË´ú¡C­p§¹¦¨7657ÀYºØ½ÞÀË´ú¡A¥]¬AÂÅ·ç´µ¡B¬ù§J®L¡B§ù¬¥§J(D)¡B±ö¤s½Þ(M)¡B®ç¶é½Þ¡B½L§J®L¡BÄõÀ¬½Þ¡Bªá¦â½Þ¡B°g±m½Þ»P¯b¸Õ¶Â½Þ¤@¸¹¡A¥H¤ÎM»PD¤§Âø¥æ½Þ¡Cµ²ªGµo²{¡G°£M»PD¤§Âø¥æ½Þ¥~¡A«e­z¦U«~ºØESR°ò¦]«¬¬°BB«¬¤§ÀW²v¤À§O¬°0.3%¡B26.6%¡B0%¡B100%¡B80.0%¡B1.0%¡B16.7%¡B10.8%¡B31.0%»P1.9%¡FB¹ï°¸°ò¦]ÀW²v«h¤À§O¬°0.05¡B0.51¡B0.00¡B1.00¡B0.81¡B0.01¡B0.42¡B0.46¡B0.50»P0.16¡C

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THE PROLIFIC GENE FREQUENCY OF ESTROGEN
RECEPTOR LOCUS FOR BREEDING PIGS IN TAIWAN

C. H. Chen, R. B. Liaw and H. L. Chang

Taiwan Livestock Research Institute, Council of Agriculture

The estrogen receptor (ESR) locus in swine was mapped at p-arm of chromosome one with two alleles, A and B. Literature indicated that BB homozygotic sows produced 1.0 and 1.5 more piglets at birth and born alive, respectively than did AA homozygotes. And thus, B allele of ESR locus is generally recognized as prolific gene. Mutagenically separated polymerase chain reaction (MS-PCR) technique was applied in the study for ESR genotyping. A total of 7657 breeding pigs from eight private breeding farms and five research stations were blood sampled for genotyping. The genotypic frequencies of BB homozygotes were 0.3%, 26.6%, 0%, 100%, 80.0%, 1.0%, 16.7%, 10.8%, 31.0% and 1.9% for Landrace, Yorkshire, Duroc, Meishan, Taoyuan, Berkshire, Lanyu, Spotty Lanyu, Mitsae and TLRI-Black, respectively. The corresponding gene frequencies for prolific gene B allele were 0.05, 0.51, 0.00, 1.00, 0.81, 0.01, 0.42, 0.46, 0.50 and 0.16, respectively.

Key Words: Estrogen receptor, Gene frequency, Swine.



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