Selection potential of different prolificacy traits in the Finnish landrace and large white populations
Selection potential of different prolificacy traits in the Finnish landrace and large white populations
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DOI：
10.1080/09064700310019082
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发表时间：
2004-01-01
影响因子：
0.9
通讯作者：
Mäki-Tanila, A
中科院分区：
文献类型：
--
作者：
Serenius, T;Sevón-Aimonen, ML;Mäki-Tanila, A
估计不同繁殖性状的遗传力和遗传相关性，以评估选择大量断奶仔猪的可能性。产仔数三个性状：总产仔数（TNB）、活产仔猪数（NBA）、断奶仔猪数（NW）；四个仔猪存活性状：死产仔猪数量（NSB）、死产仔猪百分比（NSB%）、仔猪出生至断奶期间仔猪死亡率（PM）、哺乳期间死亡仔猪百分比（PM%）；并分析了测量时间间隔的三个性状：首次分娩年龄（AFF）、首次分娩间隔（FFI）和妊娠长度（GL）。芬兰国家产仔记录计划提供了 1986 年至 2000 年间出生的 11 329 头长白猪和 8 362 头大白猪的第一胎产仔数据。AFF 和 GL 的遗传力估计值适中（0.24-0.37），而所有其他性状的遗传力估计值较低（0.03-0.11）。 TNB 和 PM 之间（长白品种为 0.68，大白品种为 0.43）以及 NBA 和 PM 之间（长白品种为 0.64，大白品种为 0.31）之间的遗传相关性表明，仅选择高 TNB 或 NBA 将导致 PM 增加。结果进一步表明，如果选择压力是低PM（长白猪的r(g) = 0.050，大白猪的r(g) = 0.43），则GL将间接增加。
Heritabilities and genetic correlations for different prolificacy traits were estimated to assess possibilities of selection for high number of piglets weaned. Three litter-size traits: total number of piglets born (TNB), number of piglets born alive (NBA), number of piglets weaned (NW); four piglet survival traits: number of stillborn piglets (NSB), percent of stillborn piglets (NSB%), piglet mortality between birth and weaning (PM), percent of dead piglets during suckling (PM%); and three traits measuring time intervals: age at first farrowing (AFF), first farrowing interval (FFI), and gestation length (GL) were analysed. The Finnish national litter recording scheme provided data on the first parity litters of 11 329 Landrace and 8 362 Large White pigs born between 1986 and 2000. The heritabilitiy estimates were moderate for AFF and GL (0.24-0.37), and low for all the other traits (0.03-0.11). The genetic correlations between TNB and PM (0.68 in Landrace and 0.43 in Large White) and between NBA and PM (0.64 in Landrace and 0.31 in Large White) suggest that selection only for high TNB or NBA will lead to increased PM. The results showed further that GL will increase indirectly if the selection pressure is for low PM (r(g) = 0.050 in Landrace and - 0.43 in Large White.