杜陆与杜隆陆猪生长、胴体及肉质性状的比较分析

拟通过比较杜洛克公猪与陆川母猪的二元杂交猪(简称杜陆猪,DLC)和杜洛克公猪与隆陆母猪(隆林公猪与陆川母猪的后代)的三元杂交猪(简称杜隆陆猪,DLLC)在生长、胴体和肉质性状上的表现来证实三元杂交的可行性。本研究分别屠宰了7月龄左右、约75 kg的DLC猪(295头)和DLLC猪(91头),测定其胴体直长、胴体斜长、背膘厚和眼肌面积等胴体性状以及肉色、pH、滴水损失、大理石纹和肌内脂肪含量等肉质性状。结果表明:1)杜陆猪的保育出栏重((17. 00±3. 73) kg,n=460)极显著高于杜隆陆猪((14. 62±2. 60) kg,n=262)(P=3. 74×10^(-7));杜隆陆猪从断奶到屠宰期间的平均日增重((402. 23±48. 94) g·d^(-1),n=74)极显著高于杜陆猪((366. 03±57. 86) g·d^(-1),n=242)(P=8. 96×10^(-7))。2)杜陆猪的胴体直长和胴体斜长((78. 68±3. 78) cm,(67. 14±2. 81)cm,n=189)均极显著低于杜隆陆猪((80. 55±3. 13) cm,(68. 26±2. 59) cm,n=88)(P=5. 79×10^(-5),P=0. 003);杜隆陆猪校正后的眼肌面积((31. 65±4. 29) cm^2,n=91)平均值大于杜陆猪((30. 84±6. 70) cm^2,n=295),但是差异不显著。3)杜隆陆猪与杜陆猪背最长肌的肉质指标均无显著差异。本研究结果说明,杜隆陆猪具有更快的生长速度和更佳的胴体品质,同时保持了杜陆猪的优良肉质,说明饲养杜隆陆三元杂交猪将具有更高的经济效益。本研究对于利用地方猪进行优质猪肉生产提供了一种新的思路。

Is the kinematics of special relativity incomplete?

A thorough analysis of composite inertial motion (relativistic sum) within the framework of special relativity leads to the conclusion that every translational motion must be the symmetrically composite relativistic sum of a finite number of quanta of velocity. It is shown that the resulting spacetime geometry is Gaussian and the four-vector calculus to have its roots in the complex-number algebra. Furthermore, this results in superluminality of signals travelling at or nearly at the canonical velocity of light between rest frames even if resting to each other.