【摘要】：本研究以羅斯308肉雞為研究對象,試驗分兩批次進行,研究在低、高豆粕添加量的情況下,日糧中添加β-甘露聚糖酶對白羽肉雞生產(chǎn)性能及腸道健康的影響。試驗一為低豆粕日糧,選取1日齡羅斯308肉雞1440只,隨機分為4個處理,每個處理設(shè)12個重復(fù),每個重復(fù)30只雞,分別飼喂4種不同處理的日糧:即基礎(chǔ)日糧、基礎(chǔ)日糧添加甘露聚糖酶(500g/t)、低能量日糧、低能量日糧添加甘露聚糖酶(500g/t),試驗期分別為42天。試驗二為高豆粕日糧,選取1日齡羅斯308肉雞1080只,隨機分為4個處理,每個處理設(shè)10個重復(fù),每個重復(fù)27只雞,分別飼喂4種不同處理的日糧:即基礎(chǔ)日糧、基礎(chǔ)日糧添加甘露聚糖酶(500g/t)、低能量日糧、低能量日糧添加甘露聚糖酶(500g/t),試驗期33天。研究結(jié)果表明:低豆粕日糧添加β-甘露聚糖酶對的肉雞的生產(chǎn)性能沒有起到顯著性的促進作用。低豆粕低能量日糧添加β-甘露聚糖酶后反而增加了料肉比;高豆粕日糧添加β-甘露聚糖酶對的肉雞的生產(chǎn)性能有一定的改善作用;低豆粕日糧添加β-甘露聚糖酶能顯著降低十二指腸的重量指數(shù),高豆粕低能量日糧添加β-甘露聚糖酶能顯著性降低回腸的重量指數(shù);低豆粕低能量日糧添加β-甘露聚糖酶組較基礎(chǔ)日糧組能顯著降低血液中尿素氮、乳酸脫氫酶的含量;日糧添加β-甘露聚糖酶降低了腸道淀粉酶活性;低豆粕日糧能量降低之后,添加β-甘露聚糖酶顯著性增加十二指腸和回腸的長度;高豆粕日糧添加β-甘露聚糖酶顯著提高了腹脂率。以上研究表明:飼糧中添加β-甘露聚糖酶可以影響肉雞腸道發(fā)育,促進機體內(nèi)蛋白質(zhì)的沉積,在一定程度上緩解外界環(huán)境對肉雞的應(yīng)激。
[Abstract]:In this study, Roth308 broiler was divided into two batches to study the effects of 尾 -mannanase supplementation in diet on the performance and intestinal health of white broilers under the condition of low and high soybean meal supplementation. Experiment 1 was a low soybean meal diet. 1440 1-day-old Roth308 broilers were randomly divided into 4 treatments with 12 replicates in each treatment and 30 chickens in each treatment. The diets were fed with four different treatments: basal diet. Mannanase (500g/t) was added to basal diet and mannanase (500g/t) was added to low energy diet for 42 days. The second experiment was high soybean meal diet. 1080 1-day-old Roth308 broilers were randomly divided into 4 treatments, with 10 replicates in each treatment and 27 chickens in each treatment. The diets were fed with four different treatments: basal diet. Mannanase (500g/t) was added to basal diet and mannanase (500g/t) was added to low energy diet for 33 days. The results showed that the low soybean meal diet supplemented with 尾 -mannanase did not play a significant role in promoting the performance of broilers. Adding 尾 -mannanase to low soybean meal and low energy diet increased feed / meat ratio, and high soybean meal diet supplemented with 尾 -mannanase could improve the performance of broiler. The addition of 尾 -mannanase to low soybean meal diet significantly decreased the weight index of duodenum, and 尾 -mannanase to high soybean meal and low energy diet significantly decreased the weight index of ileum. The contents of blood urea nitrogen and lactate dehydrogenase in low soybean meal and low energy diet supplemented with 尾 -mannanase were significantly lower than those in basal diet, and the activity of intestinal amylase was decreased in diet supplemented with 尾 -mannanase. Addition of 尾 -mannanase significantly increased the length of duodenum and ileum, and 尾 -mannanase significantly increased abdominal fat rate in high soybean meal diet. The results showed that 尾 -mannanase in diet could affect the intestinal development of broilers, promote the accumulation of protein in the body, and alleviate the stress caused by the external environment to the broilers to a certain extent.
【學(xué)位授予單位】：山東農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S831.5

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