Reproductive performance of wild boar females in Portugal
Reproductive performance of wild boar females in Portugal
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DOI：
10.1007/s10344-010-0441-6
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发表时间：
2011-04-01
影响因子：
2
通讯作者：
Soares, Amadeu M. V. M.
中科院分区：
文献类型：
--
作者：
Fonseca, Carlos;Alves da Silva, Antonio;Soares, Amadeu M. V. M.
对1997年至2001年10月至2月期间在葡萄牙中部采集的214头雌性野猪的生殖道进行了检查。根据这些资料，我们能够确定繁殖物候(受孕和出生时期)以及母猪青春期的年龄和体重、成年母猪的排卵率、胎儿性别比、宫内死亡率、最终产仔数和出生后死亡率。分析不同年份、不同地区、不同年龄、不同体重之间的差异。共有66.8%的受检女性正在怀孕或哺乳，其中96.3%的女性体重为40公斤。怀孕母猪的比例以成年母猪最高(74%)。幼年雌性(1岁及以下)中没有一只处于哺乳期，只有7%怀孕。每头母猪平均产仔数(4.1±1.2SD)和平均每母猪黄体数(4.6±1.7SD)由轻到幼，再到重和大野猪。胎儿性别比偏向男性(1.3：1)。观察到的宫内死亡率(9.7%)和出生后死亡率(6.3%)是欧洲野猪种群中有记录以来最低的。葡萄牙中部野猪种群的生产力计算为该种群中每头幼猪1.1头。在所考虑的四年中，受孕和出生时间没有显著差异。出生同步在所有年份都很明显，出生高峰出现在3月份。
Reproductive tracts of 214 female wild boars collected in Central Portugal between October and February over the period 1997 to 2001 were examined. From this material, we were able to determine reproductive phenology (conception and birth periods) as well as age and weight of sows at puberty, ovulation rates of adults, foetal sex ratio, levels of intrauterine mortality, final litter size and postnatal mortality. Differences between year, region, age and body weight were analysed. A total of 66.8% of the females examined were gestating or lactating and 96.3% of these weighed > 40 kg. The highest proportions of pregnant sows were found in the adult age/weight classes (74%). None of the juvenile females (1 year old and younger) were lactating and only 7% was pregnant. The average number of foetuses/female (4.1 +/- 1.2SD) and that of corpora lutea per female (4.6 +/- 1.7SD) increased from lighter and younger to heavier and older wild sows. Foetal sex ratio was biased towards males (1.3:1). Observed intrauterine mortality rate (9.7%) and postnatal mortality (6.3%) were among the lowest recorded in European wild boar populations. The productivity rate of the Central Portuguese wild boar population was calculated as 1.1 young per individual in the population. Conception and birth periods did not differ significantly between the considered 4 years. Birth synchronisation was pronounced in all the years, with a peak of births occurring in March.