Hughes P E, Philip G, Siswadi R
Faculty of Agriculture, Forestry and Horticulture, University of Melbourne, Parkville, Vic., Australia.
Anim Reprod Sci. 1997 Mar;46(1-2):159-65. doi: 10.1016/s0378-4320(96)01594-1.
Ninety six Large White/Landrace cross-bred gilts were used in this study, sixteen gilts being allocated to each of six treatments. The treatments compared the effects on puberty attainment of exposing gilts to boar contact either 0, 1 or 3 times daily (C, D and 3D), with or without the addition of transport "stress" (T). Treatments began at a mean gilt age of 160 days and continued for 40 days. The duration of each period of boar contact was 20 min. Those gilts receiving transport "stress" were placed on a trailer daily for the first ten days of the study and driven at a constant speed for 20 min. There was no significant effect of transport alone on the timing of gilt puberty attainment. Boar exposure significantly increased the proportion of gilts attaining puberty within 40 days of the commencement of treatments (P < 0.05) compared with gilts not receiving boar contact. Boar exposure three times daily significantly reduced mean gilt age at puberty relative to no boar exposure (190.2 vs. 202.3 days of age respectively, P < 0.01) while once-daily boar exposure gave an intermediate value (196.7 days). In addition, a significant (P < 0.01) interaction occurred between boar contact frequency and transport in this study. It is concluded that (a) transport alone does not provide a significant stimulus for early puberty attainment in the gilt, (b) the pubertal response of the gilt to the boar effect is enhanced when boar contact occurs several times each day compared with a single boar contact period, and (c) a combination of frequent boar contact and transport may result in a greater degree of gilt puberty stimulation than frequent boar contact alone.
本研究使用了96头大白猪/长白猪杂交后备母猪，将16头母猪分配到六种处理方式中的每一种。这些处理方式比较了每天让后备母猪与公猪接触0次、1次或3次（分别为C、D和3D）对达到初情期的影响，同时考虑了是否添加运输“应激”（T）。处理从后备母猪平均160日龄开始，持续40天。每次与公猪接触时长为20分钟。那些接受运输“应激”的后备母猪在研究的前十天每天被安置在拖车上，并以恒定速度行驶20分钟。单独运输对后备母猪达到初情期的时间没有显著影响。与未接触公猪的后备母猪相比，接触公猪显著提高了在处理开始后40天内达到初情期的后备母猪比例（P<0.05）。与不接触公猪相比，每天接触公猪三次显著降低了后备母猪初情期的平均年龄（分别为190.2天和202.3天，P<0.01），而每天接触公猪一次则为中间值（196.7天）。此外，在本研究中，公猪接触频率和运输之间存在显著的（P<0.01）交互作用。研究得出结论：（a）单独运输不会对后备母猪早期达到初情期产生显著刺激；（b）与单次接触公猪相比，每天多次接触公猪时，后备母猪对公猪效应的初情期反应会增强；（c）频繁接触公猪和运输相结合可能比单纯频繁接触公猪导致更大程度的后备母猪初情期刺激。
