INDIVIDUAL-DIFFERENCES, PARASITES, AND THE COSTS OF REPRODUCTION FOR BIGHORN EWES (OVIS-CANADENSIS)
INDIVIDUAL-DIFFERENCES, PARASITES, AND THE COSTS OF REPRODUCTION FOR BIGHORN EWES (OVIS-CANADENSIS)
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DOI：
10.2307/5124
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发表时间：
1989-10-01
影响因子：
4.8
通讯作者：
FESTABIANCHET, M
中科院分区：
文献类型：
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作者：
FESTABIANCHET, M
在加拿大西南部的阿尔伯塔，8年的繁殖的后果，随后的生存和繁殖成功的单独标记的大角羊母羊（Ovis canadensis）进行了检查。母羊提出的儿子并没有经历减少繁殖成功的第二年，但他们的粪便输出肺虫（原圆线虫属）。幼虫增加相对母羊提出的女儿。母羊很少知道连续几年生儿子。由于羔羊的性别在出生时并不确定，这一结果可以用出生性别比的改变来解释，也可以用母亲生下儿子后一年出生的儿子的死亡率不同来解释。母羊在2岁时泌乳似乎是在更好的条件下，更有可能在3岁时，比母羊没有在2岁时乳酸。总的来说，一年内的繁殖成功不会对下一年的繁殖产生不利影响。哺乳期母羊有更大的肺线虫幼虫粪便计数比非哺乳期母羊。母羊，产生了一只羔羊在2岁时更有可能在肺炎流行病期间死亡的母羊，没有羔羊在2年。对寄生虫和病原体的抵抗力下降似乎是繁殖的结果。
The consequences of reproduction for subsequent survival and reproductive success of individually marked bighorn ewes (Ovis canadensis) were examined over 8 years in south-western Alberta, Canada. Ewes that raised sons did not experience a decrease in reproductive success the following year, but their faecal output of lungworm (Protostrongylus spp.) larvae increased relative to ewes that raised daughters. Ewes were seldom know to produce sons in consecutive years. Because lamb sex was not determined at birth, this result could be explained by either an alteration of the birth sex ratio, or differntial mortality of sons born in the year after their mother had produced a son. Ewes that lactated at 2 years of age appeared to be in better condition, and were more likely to lactate at 3 years of age, than ewes that did not lactate at 2 years. Overall, reproductive success in one year did not adversely affect reproduction the following year. Lactating ewes had greater faecal counts of lungworm larvae than non-lactating ewes. Ewes that had produced a lamb at 2 years of age were more likely to die during a pneumonia epizootic than ewes that had not lambed at 2 years. A decrease in resistance to parasites and pathogens appears to be a consequence of reproduction.