張秀鑾 陳佳萱 黃憲榮 張伸彰
豬隻動情素接受體(ESR)基因座被認為與窩仔數有關，評估有利對偶基因B對初產與經產母豬之效應分別為0.42 and 0.31頭總產仔數。本研究總計篩檢136頭梅山與杜洛克雜交選育之F2世代種豬(101頭母豬與35頭公豬)之ESR基因型，並評估其產仔性能，包括分娩總仔數(LS)、活仔數(LSA)、三週活仔數(LS3)、離乳活仔數(LSW)、仔豬平均初生重(BWT)、三週重(WT3)與離乳重(WWT)。應用線性模式進行統計分析，固定效應包括品種組成、產次、公母豬ESR基因型與兩者之交感效應。結果顯示：LS(p=0.0407)、LSA(p=0.0184)與LS3(p=0.0211)具顯著的公母豬ESR基因型交感效應，而WWT(p=0.0535)之效應則稍弱。同時，AA與AB型母豬與配BB型公豬者，較與配AB型公豬者，可生產較大的窩仔數(LS、LSA、LS3與LSW)；此與BB型母豬之表現不同。
DEVELOPMENT OF PROLIFIC LINE IN SWINE IV. THE
OF ESTROGEN RECEPTOR GENOTYPES ON LITTERING PERFORMANCES
H. L. Chang, C. H. Chen, H. R. Huang and S. C. Chang
Taiwan Livestock Research Institute, Council of Agriculture
The estrogen receptor (ESR) locus is known to be associated with litter size in pig. Favorable effects of B allele reported were 0.42 and 0.31 for litter size at birth in first and later parities, respectively. A total of 136 animals (101 sows and 35 boars) from F2 of Meishan and Duroc crosses were genotyped at the ESR locus and evaluated for littering performances including litter sizes at birth (LS), born alive (LSA), at 3-week-age (LS3) and at weaning (LSW), and averaged individual weights at birth (BWT), at 3-week-age (WT3) and at weaning (WWT). Data were analyzed using a linear model including the fixed effects of breed composite, parity of sow and ESR genotypes of sow and boar as well as interaction between ESR genotypes of sow and boar. Interaction between ESR genotypes of sow and boar had significant effects on LS (p=0.0407), LSA (p=0.0184) and LS3 (p=0.0211) and a nominally significant effect on WWT (p=0.0535). AA sows sired by BB boars produced larger litters (LS, LSA, LS3 and LSW) when compared to those sired by AB boars. Similar trend was also observed in AB sows. However, it was not the case in BB sows.
Key Words: Prolific line, Estrogen receptor genotypes, Littering performances.