Hayssen V
Department of Physiology & Environmental Sciences, University of Nottingham, Sutton Bonington, UK.
Lab Anim. 1998 Jan;32(1):55-64. doi: 10.1258/002367798780559482.
In conjunction with establishing colonies of deer mice in the UK, effects of transportation on reproduction in agouti (A) and nonagouti (a) deer mice were assessed. Adults were shipped via ground courier and air freight from Northampton, Massachusetts, USA to Sutton Bonington, Leicestershire, England in February and June. Deer mice were paired upon arrival in Sutton Bonington, whereas matched controls were paired in the original colonies at shipping. To assess reproduction, the following variables were monitored for 110 days for all 96 pairs: number of pairs producing litters, time from pairing to birth, interlitter interval, litter size at birth, and litter size at weaning. Generally, shipping suppressed litter production and delayed its timing, but had less effect on litter size. Overall, 32 of 48 control pairs (67%) produced 69 litters compared with 37 litters from 21 of 48 pairs (44%) after shipping. Pairing-to-first-litter intervals were approximately two oestrous cycles shorter in control animals (39 vs 53 days). Averaged over all litters, litter size was higher in control pairs (4.4 vs 4.0). With respect to genotype, control agouti deer mice were less productive than nonagouti animals, but they reproduced better than nonagoutis after shipping. In control animals, colourmorphs did not differ with respect to litter production or timing, but agouti pairs had smaller litters (first litter: A: 3.1, a: 4.2) and this difference increased at successive litters (third litter A: 3.9, a: 6.0). After shipping, agouti animals produced more litters (A: 22, a: 15), and did so earlier (pairing to birth: A: 47 days, a: 60 days), as well as more frequently (interlitter interval: A: 32 days, a: 51 days). Litter size was also more similar between genotypes after shipping (A: 4.0, a: 4.1). Overall, control agouti animals produced 37% fewer offspring than nonagouti pairs. (A: 116 neonates, a: 185 neonates), but after shipping agouti deer mice produced 43% more offspring than nonagouti animals (A: 87 neonates, a: 61 neonates). In sum, transport stress suppressed reproduction for several weeks after shipping and this suppression was exacerbated in nonagouti deer mice.
在英国建立鹿鼠种群的同时，评估了运输对刺豚鼠色（A）和非刺豚鼠色（a）鹿鼠繁殖的影响。成年鹿鼠于2月和6月通过地面快递和空运从美国马萨诸塞州北安普敦运往英国莱斯特郡的萨顿博宁顿。鹿鼠抵达萨顿博宁顿后配对，而配对的对照鼠在运输时于原种群中配对。为了评估繁殖情况，对所有96对鹿鼠持续110天监测以下变量：产仔的对数、配对到出生的时间、产仔间隔、出生时的窝仔数以及断奶时的窝仔数。一般来说，运输抑制了产仔并推迟了产仔时间，但对窝仔数的影响较小。总体而言，48对对照鼠中有32对（67%）产下69窝幼崽，而运输后48对中有21对（44%）产下37窝幼崽。对照动物从配对到第一窝产仔的间隔大约短两个发情周期（39天对53天）。对所有窝仔数进行平均，对照配对的窝仔数更高（4.4对4.0）。就基因型而言，对照刺豚鼠色鹿鼠的繁殖能力低于非刺豚鼠色动物，但运输后它们的繁殖情况比非刺豚鼠色动物更好。在对照动物中，毛色形态在产仔数或产仔时间方面没有差异，但刺豚鼠色配对的窝仔数较小（第一窝：A：3.1，a：4.2），并且这种差异在后续窝仔中增大（第三窝A：3.9，a：6.0）。运输后，刺豚鼠色动物产仔更多（A：22窝，a：15窝），产仔时间更早（配对到出生：A：47天，a：60天），产仔频率也更高（产仔间隔：A：32天，a：51天）。运输后不同基因型之间的窝仔数也更接近（A：4.0，a：4.1）。总体而言，对照刺豚鼠色动物产生的后代比非刺豚鼠色配对少37%（A：116只幼崽，a：185只幼崽），但运输后刺豚鼠色鹿鼠产生的后代比非刺豚鼠色动物多43%（A：87只幼崽，a：61只幼崽）。总之，运输应激在运输后数周内抑制了繁殖，这种抑制在非刺豚鼠色鹿鼠中更为严重。
