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|標題:||Relative genetic effects of Duroc and Taoyuan breeds on the economic traits of their hybrids||作者:||Yen, N.T.
|關鍵字:||relative genetic effects;Duroc;Taoyuan;heterosis;mitochondrial-dna;pigs;polymorphism;performance;heterosis;meishan||Project:||Asian-Australasian Journal of Animal Sciences||期刊/報告no：:||Asian-Australasian Journal of Animal Sciences, Volume 14, Issue 4, Page(s) 447-454.||摘要:||
For determining the relative genetic effects of Duroc (D) and Taoyuan (T) breeds on the economic traits of their hybrids, 72 litters of pigs, from four mating types, namely TT (T male x T female), DD (D male x D female) and D-T hybrids (TD, T male x D female and DT, D male x T female) were used in this study. The various crossbreeding parameters were estimated by comparisons among mating types using linear contrasts of least-square analysis. The results of reproductive traits analysis showed that T breed had contributed superior genetic effects on the total number of piglets at birth (TBN) (p<0.10) and number of live piglets at 21 days (LP21) (p<0.05) to the D-T hybrids. Estimates of maternal genetic effects showed that the T females were superior in TEN (p<0.05), but inferior in average birth weight (ABW) and average litter birth weight (LBW) (p<0.01) to the D females. Direct heterosis effects were significant for LBW, LP21 and LWT21 (p<0.01). Least-squares analysis of other economic traits showed that T breed had relative negative effects on all growth traits, withers height (WH), body type index (BTI), average backfat thickness (ABF), carcass length (LENG), loin eye area (longissimus) (LEARA), and lean percentage (LEAN) of D-T hybrids (p<0.05). Estimates of direct genetic effects showed that the D breed was superior to the T breed in all growth and carcass traits except the average backfat (BF), Estimates df maternal genetic effects showed that average body weight at 180 days (WT180) of progenies from T sows were lighter than from D sows. Progenies from D females had larger and leaner carcass than those from T females. Direct heterosis effects were significant for average daily weight gains from 150 to 180 days (ADG(150-180)) (p<0.05) and for average body weights at 150 (WT150), and 180 days (WT180), average daily weight gains from birth to 150 and 280 days (ADG(150) and ADG(180), respectively), WH, body length (BL), ABF, BTI, and LENG (p<0.01). The results showed that D-T hybrids tended to have superior TEN and LP21 than D breed, and to be superior in all growth and most conformation and carcass traits to the T breed.
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