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                      夏季豬場降溫的誤區
                           夏季高溫高濕,對養豬生產影響很大,會使公豬精液質量變差,使配種受胎率大大降低;妊娠和哺乳母豬常出現熱死現象,產下的仔豬體質弱,成活率低;哺乳母豬因采食量低而奶水不足。致使仔豬腹瀉比例加大,斷奶體重小。從而嚴重影響生產成績和經濟效益。
                        人人都懂降溫的作用,但在具體操作時,常出現一些誤區。下面是一些常見的誤區:
                         一、現抓熱賣
                         許多豬場不提前準備.待氣溫高時才想到降溫,往往達不到理想的效果;有的豬場選擇的方案與本場條件不適應。設施安裝好后卻起不到理想的效果;有的因安裝人員不足,交了費用卻不能及時將設備安裝好;有的在使用后發現問題,進行修改時高溫季節卻要結束了。上面的情況都是花了錢卻不能收到理想的效果。所以我們建議豬場在高溫季節到來之前將降溫設施安裝并試用。確保使用過后可以放置不用。需要時便可隨意使用。豬場的降溫設備和方案可以參考湖南農業大學許道軍教授出版的《豬場環境保健關鍵技術》一書。
                         二、忽視濕度的影響
                         水簾、冷風機等都是采用水蒸發降溫原理,這與空氣濕度有很大關系:空氣濕度小時降溫效果好,空氣濕度大時降溫效果卻很差;但是高溫季節多同時出現高濕.使降溫效果大打折扣。解決辦法是高濕時用水簾等降溫的同時,采用機械通風,加大舍內空氣流動,在同樣溫度情況下增加豬的涼爽感覺。
                         三、負壓降溫時舍內封閉不嚴
                         水簾降溫時,是通過一個風扇將舍內產生負壓.使舍外空氣通過濕簾,濕簾內水分蒸發時使溫度降低,從而使變冷的空氣進入舍內,產生降溫效果;但如果這時舍內封閉不嚴,或窗戶沒關嚴,或地窗沒堵,或豬舍門大開,大量空氣不通過濕簾卻從其他孔道進入舍內;因這些孔道沒有使溫度降低的功能.從而起不到降溫效果或是效果不理想,不能達到預期的目的。
                         四、風扇使用不合理
                         風扇可使豬感到涼爽,這是人人都知道的事情,但只有風吹到身上才有涼爽的感覺,而如果安了風扇卻吹不到豬身上,不但沒有降溫效果,而且還會增加空氣流通,把舍外溫度更高的空氣帶進舍內,使舍溫更高;所以如果風扇設置不合理,一部分豬在有降溫效果的同時。另一部分豬卻增加了溫度,所以使用吊扇特別是在產房,幾頭豬共用一臺吊扇,往往效果不理想;另一種不合理現象是給公豬舍采用風扇降溫,因為公豬睪丸的溫度比體溫低2~3℃,也就是說只要空氣溫度超過35℃。就會對精液產生影響,所以在空氣溫度超過35℃時采用風扇降溫,對公豬有害而無益,許多豬場吃過這方面的虧。
                         五、水供應不足
                         曾經有一個豬場出現因斷水而導致多頭哺乳母豬被熱死的現象,而且其他母豬也出現食欲不振、奶水不足現象,損失相當大,所以在夏季電壓偏低、用水量大的情況下,必須加強水供應力度,增加儲備水箱、準備備用發電機等措施都是規模豬場應該想到的,同時使發電機和水泵經常保持完好。也是應該考慮的。
                        六、不考慮水溫
                         人在熱的時候可以通過吃冰鎮飲料來降溫,豬也是一樣的,如果熱時喝上涼爽的水,也可緩解熱的感覺。但許多豬場不注意水的循環.特別是在天氣熱時水管內的水溫度和空氣溫度接近.甚至接近豬的體溫,而豬又屬于汗腺不發達的動物,讓涼水通過消化道起到的降溫效果會更明顯。所以在水源充足的豬場,將管內溫度高的水及時放掉,讓豬喝到涼爽的水,也會起到一定的降溫效果。降溫效果是否好,不能以我們的想象來衡量。而應該讓豬說話。對母豬來說,如果不喘氣就說明豬仍能承受;對公豬來說,則必須以豬所處區域的溫度為準,在溫度超過32℃時必須采取降溫措施。
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