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飼喂高精料日糧對山羊瘤胃代謝與功能的影響

時間:2019-06-26 20:11來源:畢業論文
短期飼喂高精料對山羊頸靜脈血中皮質醇含量沒有影響(P<0.05),但長期飼喂高精料皮質醇含量顯著低于對照組和短期組(P < 0.05)。長期飼喂高精料對血漿中組胺的影響較大

摘要:由于缺乏優質的牧草,生產上為了提高泌乳反芻動物的產奶量,常常給泌乳奶牛飼喂含精料的谷物日糧。由于谷物日糧含有大量易發酵的碳水化合物,其快速發酵引起瘤胃PH下降,誘發亞急性瘤胃酸中毒(Sub-acute ruminal acidosis,SARA)。本實驗選取17只經產的健康泌乳中期關中奶山羊隨機分為三組,對照組,長期組和短期組,對照組飼喂精粗比為35:65的低精料日糧,飼喂周期為19周,長期組和短期組,飼喂精粗比為65:35的高精料日糧,飼喂周期分別為19周和4周。結果表明,短期飼喂高精料對山羊頸靜脈血中皮質醇含量沒有影響(P<0.05),但長期飼喂高精料皮質醇含量顯著低于對照組和短期組(P < 0.05)。長期飼喂高精料對血漿中組胺的影響較大,顯著高于對照組(P < 0.05),但短期組與對照組并未出現明顯差異(P>0.05);異常有害代謝產物如LPS(內毒素)顯著增加,從而對機體健康造成威脅。36652
畢業論文關鍵詞:山羊;高精料;瘤胃;揮發性脂肪酸
Effects of feeding high concentrate diets on ruminal metabolism and function of lactating dairy goat
Abstract:The rumen of the goat is the main site of material metabolism, with holds a large number of complex microorganisms. With the development of animal husbandry in China and the improvement of people’s living quality, the demand for dairy products has increased greatly. In order to improve the milk performance of dairy cows, it’s a common strategy to feed lactating dairy cows with higher grain diets. However, feeding a high grain diet easily leads to the abnormal fermentation in rumen with high accumulation of free volatile fatty acids (VFA) and then to decrease the ruminal pH value. Subacute rumen acidosis (SARA) was usually induced by feeding a high grain diet. It will eventually reduce the milk performance. In this study, Seventeen mid-lactating dairy goats were randomly allocated to 3 groups in this study. The control treatment was fed a low-concentrate diet (35%concentrate, n=5, LC) while there were two high concentrate treatments (65% concentrate, HC), one fed a high concentrate diet for a long period (19 wks, n = 7, HL) and the other fed a high concentrate diet for a short period of time (4 wks, n = 5, HS). Our results showed that ruminal fermentation was changed by HC diet feeding indicating by VFA concentrations and the ratio of acetate/propionate, as well as endotoxin concentration in the ruminal fluid. 源`自!六^維"論^文;網www.aftnzs.live
Key words: Goat;High concentrate;Rum-en;Volatile fatty acids.
目  錄

摘要1
關鍵詞1
Abstract1
Key words1
引言1
1 材料與方法2
1.1試驗設計 2
1.2采集樣品 3
1.3測定尿素氮3
1.4測定氨態氮3
1.5測定MCP3
1.6測定乳酸4
1.7試驗數據及儀器4
1.8數據統計分析4
2 結果與分析4
2.1高精料飼喂時長對血漿皮質醇的影響4
2.2高精料飼喂時長對血漿中組胺的影響 4
2.3高精料飼喂時長對發酵參數及瘤胃液中LPS濃度的影響 5
3 討論 6
3.1測飼喂高精料時間長短對奶山羊血液皮質醇的影響6
3.2飼喂高精料時間長短對奶山羊瘤VFA的影響7
3.3飼喂高精料時間長短對瘤胃代謝的影響7
致謝7
參考文獻7
飼喂高精料日糧對山羊瘤胃代謝與功能的影響
隨著我國畜牧業的發展和人民生活水平的提高,乳制品的需求量大大增加,生產上為了提高動物的產奶量,通常飼喂含精料較高的日糧,來提高動物的生產性能,但這種方式會使反芻動物瘤胃發酵產生過多的揮發性脂肪酸,導致瘤胃PH下降,誘發亞急性瘤胃酸中毒(Sub-acute ruminal acidosis,SARA)。瘤胃是反芻動物特有的器官,供給合成乳脂重要的前體物質,罹患SARA時,瘤胃發酵蓄積的大量酸性物質破壞了瘤胃組織上皮細胞,引起炎癥,粘膜壞死脫落,進而使瘤胃壁通透性增高,細菌脂多糖容易進入血液,最終引起全身性的炎癥反應。 飼喂高精料日糧對山羊瘤胃代謝與功能的影響:http://www.aftnzs.live/yixue/20190626/35210.html
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