【摘要】：本試驗旨在應用康奈爾凈碳水化合物-蛋白質(zhì)體系(CNCPS)和NRC模型比較玉米纖維飼料(DCGF)與奶牛常用粗飼料(苜蓿、玉米青貯、羊草)營養(yǎng)價值,進而分析DCGF作為奶牛纖維飼料資源的可行性。采集東北地區(qū)不同牧場的飼料樣本,測定營養(yǎng)成分后利用CNCPS模型對各飼料蛋白質(zhì)和碳水化合物進行剖分,并預測各飼料對奶牛的潛在營養(yǎng)物質(zhì)供給量,同時利用NRC模型對4種飼料的可消化養(yǎng)分和能值進行估測計算。結果表明:1)DCGF中粗蛋白質(zhì)(CP)含量顯著高于玉米青貯和羊草(P0.05),中性洗滌纖維(NDF)含量顯著高于苜蓿(P0.05),且酸性洗滌纖維(ADF)、酸性洗滌木質(zhì)素(ADL)含量顯著低于其他3種粗飼料(P0.05)。2)DCGF快速降解真蛋白質(zhì)(PB1)和中速降解真蛋白質(zhì)(PB2)含量顯著低于苜蓿(P0.05);中速降解碳水化合物(CB1)和慢速降解碳水化合物(CB2)含量顯著高于其他3種粗飼料(P0.05)。3)苜蓿的可代謝蛋白質(zhì)(MP)含量最高,其次為DCGF。4)DCGF在維持水平下總可消化養(yǎng)分(TDNm)和凈能均最高。結果提示,DCGF具有較高的營養(yǎng)價值,可以作為奶牛纖維類高蛋白質(zhì)飼料替代奶牛飼糧中部分粗飼料,緩解我國優(yōu)質(zhì)粗飼料、蛋白質(zhì)飼料資源緊缺的壓力。
[Abstract]:The purpose of this study was to compare the nutritional value of corn fiber feed (DCGF) with that of common dairy cattle (alfalfa, corn silage, Leymus chinensis) by using Cornell net carbohydrate protein system (CNCPS) and NRC model. Furthermore, the feasibility of DCGF as a fiber feed resource for dairy cows was analyzed. The feed samples from different pastures in Northeast China were collected, and the dietary protein and carbohydrates were subdivided by CNCPS model, and the potential nutrient supply of each feed to dairy cattle was predicted. At the same time, the digestible nutrients and energy values of four kinds of feed were estimated by NRC model. The results showed that the content of crude protein (CP) in DCGF was significantly higher than that in corn silage and Leymus chinensis (P0.05), the content of neutral detergent fiber (NDF) was significantly higher than that of alfalfa (P0.05), and the content of acid detergent fiber (ADF) and acid detergent lignin (ADL) were significantly lower than those of the other three kinds of forage. (P0.05) the contents of fast degradable true protein (PB1) and moderate degradable true protein (PB2) of DCGF were significantly lower than those of alfalfa (P0.05), and the contents of carbohydrate (CB1) and slowly degraded carbohydrate (CB2) of alfalfa were significantly higher than those of other three kinds of forage (P0.05). Protein (MP) content is the highest, DCGF.4) DCGF had the highest total digestible nutrients (TDNm) and net energy at maintenance level. The results suggest that DCGF has higher nutritional value and can be used as fiber high protein diet to replace some of the crude feed in dairy cattle diet and relieve the pressure of shortage of high quality crude feed and protein feed resources in China.
【作者單位】： 東北農(nóng)業(yè)大學動物科技學院;
【基金】：寒區(qū)規(guī)�；膛瞿膛＞氾曫B(yǎng)與粗飼料高效利用關鍵技術集成與示范(2012BAD12B05-1)
【分類號】：S816

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