Air temperature is not the only component of the pig's thermal environment. Other components can influence the sensible heat exchange between the pig and its environment.
空氣溫度并不是豬熱環(huán)境中的唯一因素。其它一些因素也會影響豬與環(huán)境之間的感官熱交換。
However, when manure is pumped from the storage under the building, hydrogen sulfide levels can be elevated and reach lethal levels in some cases.
但是，當糞便從建筑底部的儲糞池泵出時，硫化氫的濃度會提高。在某些條件下，甚至會達到致命濃度。
A cardinal rule of diagnostic testing is that no test should be run unless there is a plan for interpreting and responding appropriately to the results.
診斷性檢測的一個基本原則是，除非有方案可以合理地解釋結(jié)果并作出反應，否則不應該進行任何檢測。
There is evidence that gilts exhibiting a more rapid response to boar exposure are innately more fertile. The corollary is that gilts not pubertal within 28 days of boar contact are likely less fertile and should be culled.
有證據(jù)表明，在公豬刺激時能更快表現(xiàn)出發(fā)情反應的青年母豬天生具備更佳的繁殖能力。因此，如果母豬在公豬接觸后28天內(nèi)沒有出現(xiàn)首次發(fā)情，很有可能繁殖能力更差且應當淘汰。
Gilts should be taken to the boar and not vice versa. In the event of poor estrus detection management, the use of a separate detection-mating area (DMA) should be considered.
應當趕青年母豬帶入公豬欄，而不是相反的做法。在發(fā)情檢測管理不佳的情況下，應當考慮使用單獨的查情配種區(qū)（detection-mating area，DMA）。
A good rule of thumb to obtain an optimum herd parity profile is that 90% of the gilts that are started in the herd should reach parity 1, and 90% of the parity 1 animals should reach parity 2 (Leman 1992).
一個用于最佳豬群胎齡結(jié)構的很好的經(jīng)驗法則是，進入種豬群的90%后備母豬應當達到1胎，而90%的1胎母豬應當達到2胎（李曼，1992年）。
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