第3章 尽头牙
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夜幕低垂，徐平坐在书房里仔细看着陶六口述之后找人记下来的事情经过。龙腾小说网ltxs520.com在桌子的另一边，盼盼半站在椅子上，吃力地拿着枝毛笔趴在桌子上练字。
人工授精的技术并不特别困难，最关键的是从种马取出精-液之后的保存。在徐平前世已经广泛采用冷冻的方法，低温可以保存较长的时间。这个年代自然不可能，只能采用常温保存的办法，最可靠的还是用容器直接保存在动物体内，精子可以维持一两天的活力。
以前依靠自然繁殖，徐平的田庄想尽了各种办法，一匹公马也不过只能配十一二只母马，形成一个小的繁殖种群，再多，效果就要急剧下降。
优良的公母是非常昂贵的，而且很难得。用自然繁殖的办法，生出来的后代品种优良的机率并不高，再加上幼崽的夭折，繁育优良马种是相当不容易的。如今大宋境内没有野马群，优良的种马只能从党项和契丹引进，繁育困难，再加上品种退化，不要说是能够用作军马的马匹，就是能够役用的马也非常稀缺。
汉唐的牧马场都在西北，而现在的马监多在中原河北。中原不是不能养马，气候和水草都能够满足马匹的生长繁衍，最缺的是优良种马的引入。人工放养的马匹如果不进行优选优育，品种会非常快地退化，没有草原地区优质种马的输入是非常致命的。
而一旦采用人工授精的办法，一匹种马一次可以让成百上千的母马受孕，对优质种马的需求就一下子降了下来。再配合优选优育，用不多的好马就可以维持优质种群，而次一级的优良公马也解脱出来，可以直接用于骑乘和役用。
这是徐平所能想出的挽救中原马政的惟一办法，不如此，投入再多的人力物力也不能够解决根本问题。中原能养马，但却不能保持种群不退化，只有用高繁殖率高淘汰率才能跟草原上数以千万计的马群抗衡。
这是科学，是客观规率，并不以人的主观意志为转移。不使用科学的方法，就是把群牧司的官员逼死，他们也养不出足够的优良马匹来。
盼盼写了一会字，觉得累了，把毛笔放下，用手托着腮，看着坐在对面的徐平，小声问道：“阿爹，你在看什么呢？那样用心，也不过来教我写字。”
徐平抬起头，看着盼盼有些尴尬，道：“这是大人的事情，你小孩子不要操这么多的心。有妈妈教你写字足够了，阿爹有多少大事要做！”
盼盼装模作样地叹了口气：“妈妈要给盼盼生弟弟妹妹了，也没空陪我了啊！”
林素娘过年的那段时间有了身孕，现在已经大腹便便，她自己不在意，张三娘却是看得紧，一点事情都不让她做。就是盼盼，也不能缠着母亲玩了，奶奶可是会说她。
这种事情徐平也无奈，这年头可没有男人在家带孩子的，他也不会带，只好对盼盼道：“等你有了弟弟妹妹，就有人陪你玩了，还不开心？”
盼盼摇头：“小孩子最烦人了，翁翁跟我说，以前不记事的时候，我不知道摔坏了他多少宝贝呢！等到有了弟弟妹妹，我就要被他烦了。”
这孩子从小到大被家里上上下下惯得不像话，徐平也拿他没有办法，只好道：“你不要这样想，小时候你带弟弟妹妹，长大了他们就会听你的话，多好的事情！”
盼盼连连摇头，一副愁容满面的样子。
过了一会，盼盼突然张开嘴巴道：“阿爹，你快过来看看，昨天我掉了一颗牙去，流了血呢，好吓人！翁翁说我这一口牙都会掉光，以后可怎么吃东西！”
“掉了自然会长，新的牙更硬，你什么咬不动！现在一口奶牙，不掉才是没用呢！”
徐平嘴里说着，把手中的纸放在桌子上，起身看盼盼的嘴里。一颗牙掉了去，显得空在那里果然有些些难看。
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