本文選題：全株青貯玉米 + 增重效果　； 參考：《沈陽農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：目前全株青貯玉米對肉羊的適宜飼喂比例尚不明確,因此本試驗(yàn)采用單因素試驗(yàn)設(shè)計(jì),配制全株青貯玉米比例為30%、40%、50%、60%和70%的五種試驗(yàn)日糧。選擇60只平均體重30kg左右三月齡的肉羊,隨機(jī)平均分成5組,分別飼喂不同全株青貯玉米比例的日糧,進(jìn)行體外消化培養(yǎng),通過測定羊的生長情況、營養(yǎng)物質(zhì)瘤胃降解率和瘤胃內(nèi)環(huán)境,以研究全株青貯玉米飼喂比例對肉羊增重效果和瘤胃發(fā)酵的影響,尋求最優(yōu)全株青貯玉米比例,優(yōu)化日糧結(jié)構(gòu)。通過對肉羊的育肥,結(jié)果表明:隨著全株青貯玉米比例的升高,平均干物質(zhì)采食量下降;40%組增重效果最佳,經(jīng)濟(jì)效益最高。試驗(yàn)研究表明:NDF在發(fā)酵3h、9h、12h時(shí),30%和40%組降解率顯著高于其他組(P0.05);6h時(shí),30%組顯著高于其他組(P0.05)。ADF在發(fā)酵9h前,30%組、40%組、50%和60%組顯著高于70%組(P0.05);在發(fā)酵12h時(shí),40%組、50%組和60%組顯著高于30%組和70%組(P0.05)。CP在發(fā)酵6h前,30%組顯著高于其他組(P0.05)。9h時(shí),30%組、40%組和50%組顯著高于其他組(P0.05);12h時(shí),30%組、40%組顯著高于其他組(P0.05)。DM在發(fā)酵3～12h時(shí),30%組、40%組、50%組和60%組顯著高于70%組(P0.05)。應(yīng)用ANKOM RFS系統(tǒng)對五種日糧發(fā)酵過程中的產(chǎn)氣量并利用發(fā)酵12h的瘤胃液對瘤胃內(nèi)環(huán)境進(jìn)行檢測,結(jié)果表明:40%全株青貯玉米組產(chǎn)氣量最小。瘤胃pH、NH3-N濃度隨著全株青貯玉米比例的提高,逐漸減小。乙酸濃度和乙丙比隨著全株青貯玉米比例上升而逐漸增大,丙酸濃度隨著全株青貯玉米比例上升而逐漸減小,丁酸濃度40%組顯著高于其他組(P0.05)�？俈FA40%組、50%組和60%組差異不顯著(P0.05),但顯著高于30%組和70%組(P0.05)。其中40%組總VFA濃度最高。50%組原蟲數(shù)量顯著高于其他組(P0.05),其次40%組最多。在本試驗(yàn)條件下,40%全株青貯玉米飼喂比例對肉羊的生產(chǎn)效率有促進(jìn)作用。
[Abstract]:At present, the suitable feeding ratio of silage corn to meat sheep is not clear, so the single factor experiment design is adopted in this experiment, and the proportion of the whole silage corn is 30 ~ 40% and 50% and 70% respectively. Sixty meat sheep with average body weight of about three months of 30kg were randomly divided into 5 groups and fed diets with different proportion of silage corn in vitro. The growth of the sheep was measured. The effects of rumen degradation rate and rumen internal environment on the weight gain and rumen fermentation of meat sheep were studied in order to optimize the ration of whole plant silage corn and the structure of diet. Through fattening the meat sheep, the results showed that with the increase of the proportion of silage corn, the average dry matter intake decreased by 40%, the effect of weight gain was the best, and the economic benefit was the highest. The experimental results showed that the degradation rates of the 30% and 40% groups were significantly higher than those of the other groups at 6 h after fermentation for 3 h or 9 h, and 50% and 60% for 40% and 60% groups respectively, and 50% and 60% for 40% and 60% groups for 12 h, respectively, and 50% and 60% for 30% and 60% groups, respectively, at 12 h after fermentation. It was significantly higher in 30% group than in 30% group and 70% group in 30% group before fermentation for 6 h. It was significantly higher in 30% group than that in other group P0.05% group and 50% group at 9 h before fermentation. It was significantly higher in 40% group than in other group P0.05% group at 12 h after fermentation and 40% group in 30% group and in 60% group at 312h after fermenting, which was significantly higher than that of P0.05% group in other groups. The ANKOM RFS system was used to detect the gas production of five diets during fermentation and the rumen fluid for 12 h fermentation. The results showed that the minimum gas production was obtained in the whole plant silage corn group of 40%. The pH value of NH _ 3-N in rumen decreased with the increase of the proportion of silage corn. The concentration of acetic acid and ethylene-propyl acid increased with the increase of the proportion of silage corn, and the concentration of propionic acid decreased with the proportion of silage corn. The concentration of butyric acid in 40% group was significantly higher than that in other groups. There was no significant difference between 50% group and 60% group in total VFA 40%, but it was significantly higher than that in 30% and 70% groups. The number of protozoa in the 40% group with the highest total VFA concentration of .50% was significantly higher than that of the other groups (P 0.05), followed by the 40% group. Under the experimental condition, 40% silage maize feed ratio can promote the production efficiency of meat sheep.
【學(xué)位授予單位】：沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S826.5
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本文編號：1894315