肉牛常见饲料干物质和蛋白质瘤胃降解特性和小肠消化率研究

[方法]选用装有瘤胃瘘管和小肠瘘管的肉牛作为试验动物,尼龙袋法测定肉牛常见饲料干物质(DM)和粗蛋白(CP)的瘤胃降解特性和小肠消化率。[结果]结果表明,DM瘤胃有效降解率由高到低为玉米粉、麦麸、苜蓿干草、豆粕、菜籽粕、玉米青贮、醋糟、白酒糟;CP瘤胃有效降解率由高到低为苜蓿干草、麦麸、豆粕、醋糟、玉米粉、玉米青贮、菜籽粕、白酒糟;DM小肠消化率由高到低为豆粕、菜籽粕、玉米粉、白酒糟、醋糟、麦麸、苜蓿干草、玉米青贮;CP小肠消化率由高到低为豆粕、菜籽粕、玉米粉、苜蓿干草、麦麸、白酒糟、玉米青贮、醋糟。[结论]试验表明,不同饲料瘤胃降解特性不同,为小肠提供过瘤胃可消化蛋白的能力不同,且饲料的DM小肠消化率小于CP小肠消化率。     

常用饲料原料干物质及蛋白质在大足黑山羊瘤胃内降解规律的研究

选用4头体重相近的安装有永久性瘤胃瘘管的周岁大足黑山羊阉羊,采用瘤胃尼龙袋法,测定常用的3类17种饲料原料干物质及蛋白质在瘤胃内的有效降解率。结果表明:干物质有效降解率由大到小的顺序为小麦、玉米、大米、高粱、麸皮、豆粕、菜粕、棉粕、玉米酒糟、花生秸、苜蓿干草、鱼粉、玉米秸、小麦秸、稻草、棉花秸、稻谷壳,蛋白质有效降解率由大到小的顺序为麸皮、小麦、玉米、大米、高粱、苜蓿干草、花生秸、玉米酒糟、豆粕、棉粕、菜粕、鱼粉、玉米秸、小麦秸、稻草、棉花秸、稻谷壳。     

不同蛋白原料对绵羊瘤胃体外发酵参数和氨基酸含量的影响

试验旨在研究不同蛋白原料对绵羊瘤胃体外发酵参数和氨基酸含量的影响。试验采用体外发酵法，以豆粕、棉仁粕、花生粕、菜籽饼、干酒糟及其可溶物（DDGS）和玉米胚芽饼为发酵底物，测定产气量、消化率、瘤胃液发酵参数、挥发性脂肪酸（VFA）及氨基酸含量。结果显示，杂粕各组的48 h产气量（GP）显著低于豆粕组（P<0.05）。玉米胚芽饼组的粗蛋白（CP）降解率显著高于豆粕组（P<0.05），棉仁粕、花生粕、菜粕、DDGS组显著低于豆粕组（P<0.05）。棉仁粕、菜粕组的氨态氮（NH3-N）含量显著高于豆粕组（P<0.05），棉仁粕组乙酸、丙酸、丁酸、异丁酸、异戊酸、总挥发性脂肪酸含量和乙丙比显著高于豆粕组（P<0.05），菜粕组的乙丙比显著高于豆粕组（P<0.05），玉米胚芽饼组的戊酸含量显著高于豆粕组（P<0.05）。花生粕、菜粕、DDGS组总脂肪酸含量显著高于豆粕组（P<0.05），棉仁粕组亮氨酸（Leu）、赖氨酸（Lys）、蛋氨酸（Met）、精氨酸（Arg）、谷氨酸（Glu）含量显著高于豆粕组（P<0.05），花生粕、菜粕、DDGS组的苏...     

瘤胃非降解蛋白小肠消化率测定方法及影响因素的研究

本试验采用移动尼龙袋法、原始的三步体外法和改进的三步体外法测定了不同产地10种饲料的瘤胃非降解蛋白(R UP)小肠消化率,并对体外法测定结果与移动尼龙袋法测定结果做相关分析,旨在研究产地对不同饲料RUP小肠消化率的影响及寻找替代移动尼龙袋法测定饲料RUP小肠消化率的简便方法。试验材料选用不同产地豆粕、葵花粕、棉粕、菜粕、芝麻粕、大麦、麦麸、玉米、米糠、米糠粕。选用3头带有永久性瘤胃瘘管和十二指肠瘘管奶牛(体况良好,体重相似),瘤胃降解试验和移动尼龙袋试验均采用3×3拉丁方设计。结果表明:产地对豆粕、芝麻粕、大麦、麦麸、米糠粕、玉米RUP小肠消化率有影响。改进三步体外法与移动尼龙袋法测定结果强相关(R2=0.8089,P<0.05)。改进的三步体外法替代移动尼龙袋法测定R UP小肠消化率是可行的。     

移动尼龙袋法测定蛋白质饲料过瘤胃氨基酸的小肠消化率

试验测定了不同蛋白质饲料氨基酸的瘤胃降解率和瘤胃非降解残渣氨基酸的小肠消化率,旨在为建立饲料氨基酸小肠消化率数据库提供参考依据,以期指导日粮的配制。试验选用3头装有瘤胃瘘管和十二指肠瘘管的荷斯坦奶牛作为试验动物,采用瘤胃尼龙袋法和小肠尼龙袋法分别测定豆粕、葵花粕、芝麻粕、菜籽粕和棉粕的氨基酸含量、氨基酸的瘤胃降解率和小肠消化率。结果表明,不同的饲料过瘤胃氨基酸小肠消化率是不同的。同种饲料不同过瘤胃氨基酸的小肠消化率也不同。     

不同来源蛋白质饲料瘤胃降解特性研究

文章旨在研究豆粕、牡丹籽粕、棉籽粕、棕榈粕、啤酒糟、豆渣、味精渣、玉米酒精糟（DDGS）、芝麻饼粕和葵花饼共10种蛋白质饲料原料的瘤胃降解特性。试验选用3头装有永久性瘤胃瘘管的鲁西牛×利木赞杂交牛为试验动物，采用尼龙袋法测定10种蛋白质饲料的干物质（DM）、粗蛋白质（CP）、中性洗涤纤维（NDF）和酸性洗涤纤维（ADF）瘤胃降解率。结果表明：味精渣DM有效降解率最高，芝麻饼粕最低，各原料间差异显著（P＜0.05）|CP有效降解率为棉籽粕＞牡丹籽粕＞豆粕＞味精渣＞豆渣＞DDGS＞葵花粕＞啤酒糟＞棕榈粕＞芝麻饼粕，各原料间显著差异（P＜0.05）|味精渣、棉籽粕和豆粕的NDF有效降解率较高，棕榈粕、啤酒糟和芝麻饼粕较低，各原料间差异显著（P＜0.05）|味精渣ADF有效降解率最高，其次为豆粕、棉籽粕和牡丹籽粕，均显著高于其他原料（P＜0.05）。综上所述，不同来源蛋白质饲料具有不同的瘤胃降解特性，采用隶属函数进行综合营养评价，排序为味精渣＞豆粕＞棉籽粕＞DDGS＞牡丹籽粕＞芝麻饼粕＞啤酒糟＞豆渣＞葵花粕＞棕榈粕。 [关键词]蛋白质饲料|瘤胃降解率|尼龙袋法|营养成分     

奶牛对不同糟渣类饲料营养成分的瘤胃降解率和小肠消化率对比研究

本试验旨在对比奶牛对不同糟渣类饲料(玉米酒糟、高粱酒糟、醋糟、糖糟、啤酒糟)的营养成分瘤胃降解率和小肠消化率.选用3只装有永久性瘤胃瘘管的中国荷斯坦奶牛,用尼龙袋法测定干物质(DM)、粗蛋白质(CP)、必需氨基酸(EAA)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)在不同时间点的瘤胃降解率和小肠消化率.结果表明:1...     

收购信息

1求购玉米小麦麸皮棉粕菜粕豆粕鱼粉次粉肉骨粉玉米胚芽粕青霉素糟蛋白粉 湖北富民吉康饲料（集团）有限公司为了满足本公司生产的需要,现常年收购：玉米、小麦、青霉素糟、棉粕、菜粕、豆粕、玉米胚芽粕、蛋白粉、鱼粉、次粉、麸皮等饲料原料及饲料添加剂,现款结算。     

常用饲料原料蛋白质在梅花鹿瘤胃内降解率的测定

为研究几种鹿常用饲料原料的蛋白质瘤胃降解规律,以4头安装有永久性瘤胃瘘管的成年雄性梅花鹿为试验动物,采用尼龙袋法对棉籽粕、玉米胚芽粕、菜籽粕、干酒糟及其可溶物(DDGS)、玉米蛋白粉、玉米纤维及羊草的蛋白质瘤胃降解率进行测定。结果表明:1)棉籽粕的蛋白质瘤胃降解率始终最高,与其他几种饲料原料相比,在各时间点的差异均达到极显著(P<0.01)。2)48 h的蛋白质瘤胃降解率从高到低依次为棉籽粕、玉米蛋白粉、羊草、DDGS、玉米胚芽粕、菜籽粕和玉米纤维,蛋白质瘤胃动态降解率亦呈现相似的变化规律。由此得出,棉籽粕的蛋白质瘤胃降解率较高,生产实践中要考虑进行过瘤胃保护技术,以减少蛋白质资源的浪费;菜籽粕的蛋白质瘤胃降解率较低,是一种待开发利用的蛋白质补充料;玉米胚芽粕、DDGS、玉米蛋白粉、玉米纤维及羊草可作为鹿生产中常用的饲料原料。     

6种常用饲料原料在肉牛瘤胃内降解规律的研究

选用3头体重相近的安装有永久性瘤胃瘘管的科尔沁肉牛,采用尼龙袋法测定玉米面、压片玉米、啤酒糟、玉米酒糟、蚕豆和豌豆壳6种饲料原料在肉牛瘤胃内干物质(DM)、粗蛋白(CP)、淀粉的瘤胃降解率。结果显示:6种饲料原料的DM、CP的肉牛瘤胃有效降解率,压片玉米与玉米面显著高于蚕豆、豌豆壳、玉米酒糟和啤酒糟(P<0.05),压片玉米与玉米面差异不显著(P>0.05);淀粉的肉牛瘤胃有效降解率大小顺序依次为蚕豆、压片玉米、玉米面、豌豆壳、玉米酒糟和啤酒糟。试验表明,蚕豆和压片玉米、玉米面的瘤胃降解率较高,玉米酒糟与豌豆壳居中,啤酒糟相对较差。     

氯化锌对饲料蛋白质瘤胃降解的影响

探索用新的蛋白质保护剂氯化锌保护豆粕、棉籽粕、菜籽粕和胡麻粕4种饲料,用尼龙袋法测定4种饲料处理前后蛋白质的瘤胃降解率。结果表明:ZnCl2处理可以降低饲料蛋白质在瘤胃的降解率,能够保护饲料蛋白质,提高过瘤胃蛋白的数量。0.5%ZnCl2处理可降低豆粕、棉籽粕、菜籽粕和胡麻粕蛋白质有效降解率8.2%、3.8%、14.9%和9.8%。从降解动力学分析,ZnCl2处理降低了饲料蛋白质的快速降解部分和降解速度,从而降低了蛋白质的有效降解率。     

Nutrient digestibility and energy value of sheep rations differing in protein level, main protein source and non-forage fibre source

Two in vivo digestion trials were conducted to evaluate the effects of diet's crude protein (CP) level, N degradability, and non-forage fibre source (NFFS) on nutrient digestibility and energy value of sheep rations. In each trial, rams were fed four isocaloric and isofibrous rations, differing in main protein and/or NFFS source. At the first trial, mean CP/metabolizable energy (ME) ratio of the diets was 17 g/MJ ME and at the second trial, 13 g/MJ ME. At both trials, the first ration contained cotton seed cake (CSC) and wheat bran (WB), the second CSC and corn gluten feed (CGF), the third corn gluten meal (CGM) and WB and the fourth CGM and CGF. Data of both trials were analysed in common as 2 x 2 x 2 factorial experimental design. Low N degradability (CGM) had positive effect on CP, neutral detergent fibre (NDF) and acid detergent fibre (ADF) digestibility of the ration. Those results suggest that an increase in rumen undegradable protein (RUP) content does not negatively affect nutrient digestibility of sheep rations. Corn gluten feed significantly elevated crude fibre (CF) digestibility, in comparison with WB. Rations having high CP/ME ratio had higher digestibility of CP in comparison with those having low CP/ME ratio; the opposite was true for ether extract, CF, NDF and ADF digestibilities. CP level x N degradability interaction negatively affected energy value of the rations that had high CP level and high N degradability. Former suggest that when CP content is high then N degradability should be low otherwise ration's ME is negatively affected. CP digestibility and coefficient q of the rations containing WB and having high N degradability (N degradability x NFFS interaction) were the lowest suggesting that the combination of CSC and WB negatively affected CP digestibility and energy value of the ration. This could be explained by a reduced microbial CP synthesis, or lower RUP digestibility or both.     

Characterization of dietary protein in Brassica carinata meal when used as a protein supplement for beef cattle consuming a forage-based diet

As a novel oilseed crop in Florida, Brassica carinata has the capacity of producing high-quality jet biofuel, with a protein-dense meal (~40% crude protein; CP) obtained as a by-product of oil extraction. Characterization of the meal protein is limited, yet necessary for formulation of beef cattle diets; therefore, the objective of this experiment was to determine ruminal and postruminal digestibility of protein from B. carinata. Eight ruminally cannulated Angus crossbred steers (473 ± 119 kg) were used in a duplicated 4 × 4 Latin square design, in which in situ ruminal and postruminal degradability of nutrients were evaluated. The three-step in vitro procedure was used to compare CP and amino acid (AA) degradation in B. carinata meal pellets (BCM) with that of cottonseed meal (CSM), dry distillers grains with solubles (DDGS), and soybean meal (SBM). In situ bags were incubated in the rumen for 0 to 96 hr, with the undegraded supplement remaining after 16 hr subjected to serial in vitro enzymatic solutions. Data were analyzed using the MIXED procedure of SAS. Ruminal rate of degradation of dry matter, organic matter, and CP was greatest (P ˂ 0.01; 10.9, 11.3, and 11.5 %/h, respectively) for SBM. Rumen degradable protein (RDP) content did not differ (P = 0.20; 47.8% and 55.1%, respectively) between CSM and DDGS, but was decreased (P ˂ 0.01) compared with SBM and BCM, which did not differ (P = 0.99; 72.3% and 71.8% RDP, respectively). Compared with DDGS, SBM had greater (P < 0.01) intestinal digestibility of rumen undegradable protein (RUP). Intestinally absorbable digestible protein (IADP) was greatest (P < 0.01) for CSM, with SBM and BCM having the least IADP. Total tract digestibility of CP (TTDP) was greater (P < 0.01) for SBM compared with CSM and DDGS. The contribution of RUP to intestinally absorbable AA was 7.2 and 3.1 g of lysine and methionine per kilogram of CP in BCM, respectively. The evaluation of B. carinata meal as protein supplemented for cattle consuming a forage-based diet resulted in 71.8% RDP and 97.1% TTDP, thus indicating its viability as a high-quality protein supplement for beef cattle.     

Amino acid profile of escaped feed protein after rumen incubation and their intestinal digestibility.

The crude protein content and amino acid profile of seven feedstuffs (linseed meal, maize gluten meal, rapeseed meal, rapeseed meal protected, soybean meal, fullfat soybean extruded and sunflower meal) were determined before and after ruminal incubation for 16 h in three bulls with large rumen cannulas. The intestinal disappearance of amino acids was measured using mobile bag technique. Ruminal incubation affected amino acid profile of all experimental feedstuffs. Crude protein degradation varied from 29.3% for maize gluten meal to 86.4% for rapeseed meal. A tendency towards increased disappearance was observed for glutamic acid, histidine, lysine and proline and decreased disappearance for branched-chain amino acids. The intestinal crude protein digestibility was higher than > 80%, except rapeseed meal (66.4%) and sunflower meal (77.8%). The least digestible individual amino acids were methionine and isoleucine in rapeseed meal, histidine and methionine in rapeseed meal protected and arginine in sunflower meal. In general, the lowest amino acid digestibilities were found in feedstuffs with the highest fibre content. The feedstuffs show that they have different potential for supplying of limiting amino acids. Of particular value are the feedstuffs with low crude protein degradability in the rumen and high intestinal digestibility of amino acids.     

Nitrogen balance and amino acid disappearance from the small intestine in calves fed soybean meal-, toasted soybean meal- or corn gluten meal-supplemented diets

Nine crossbred (Hereford X Angus X Charolais) heifer calves (139 kg; 6 mo of age) with abomasal and ileal cannulas were used in a repeated design to evaluate N balance and amino acid disappearance in the small intestine. Calves were fed either soybean meal (SBM), toasted SBM (TSBM, 93 C for 90 min) or corn gluten meal (CGM) as supplemental protein sources. Each calf received approximately 83 g N/d from a cottonseed hull-corn based diet with 43% of the total dietary N supplied by the test proteins. Each experimental period consisted of a 10-d adaptation, 6-d digesta collection and 5-d excreta collection. Following the first 21-d period, calves were randomly re-allotted to treatment and the sampling process was repeated. Dry matter (64%) and N digestibilities (61%) and N retention (36.8 g/d) were similar (P greater than .10) among treatments. Nitrogen flow to the small intestine was similar for TSBM- and CGM-fed calves (119.1 g/d), but greater (P less than .01) than for those offered SBM (96.3 g/d). Offering TSBM and CGM resulted in greater quantities of essential, nonessential and total amino acids reaching the abomasum compared with SBM. Total amino acid flow to the small intestine was 100, 120 and 128% of intake for SBM, TSBM and CGM, respectively. Numerically, amino acid digestibility was lower in CGM-fed calves. Methionine digestibility was highest (64.6%), while histidine was lowest (43.7%). Feeding CGM may result in greater quantities of amino acids reaching the small intestine; however, several of these amino acids may be less digestible than for TSBM.     

Effects of using thermally treated lupins instead of soybean meal and rapeseed meal in total mixed rations on in vitro microbial yield and performance of dairy cows

The objective was to study whether thermally treated lupins (TTL) can replace solvent-extracted soybean meal (SBM) and rapeseed meal (RSM) in dairy cow rations. Three total mixed rations (TMR) were used. They differed in the inclusion of the main protein feeds (TTL alone, TTL + RSM and RSM + SBM) but were equal in organic matter digestibility and metabolizable energy content. In vitro organic matter fermentation was not significantly different between the TMR. Efficiency of microbial crude protein (MCP) synthesis was significantly higher for TMR RSM + SBM than for TTL. In vitro gas production potential was similar for the three TMR. The maximal rate of gas production was achieved later in TMR TTL than in RSM + SBM. Feed intake of dairy cows was significantly lower when TMR TTL was fed than when TMR TTL + RSM or RSM + SBM were fed. Milk yield was significantly lower with the high inclusion rate of TTL in comparison with the other TMR. The contents of milk protein and milk fat were significantly lower when the two TTL containing TMR were fed in comparison with the RSM + SBM ration. Effects of TTL inclusion on MCP synthesis may affect the amino acid supply to the duodenum of cows to a greater extent than differences in the degradability of feed proteins.     

Profile of digested feed amino acids from untreated and expander treated feeds estimated using in situ methods in dairy cows

Guar meal, sunflower meal, rapeseed cake, peas, maize, rye, wheat and barley were subjected to expander treatment at different temperatures (95–150 °C), and effect on amino acid availability was assessed using rumen nylon bag and mobile bagin situ methods. Expander treatment of rapeseed cake at 142 °C decreased feed lysine content, probably due to formation of complex compounds. Effective rumen degradability and total tract digestibility of protein, total amino acids, lysine, methionine, threonine, isoleucine, leucine, valine, and phenylalanine were compared to values for the untreated feeds. Effective rumen degradability seemed to decrease due to expander treatment for all cereals, except maize. Effective rumen degradability for sunflower meal and rapeseed cake was unaffected by expander treatment at 115 °C, whereas expander treatment at 142 °C appeared to decreased effective rumen degradability for rapeseed meal. Total amino acid digestibility was not decreased by expander treatment. Both for untreated and heat treated feeds rumen degradability and total tract digestibility of individual amino acids were generally in agreement with results for crude protein. Observed amino acid profiles supplied by digestible rumen undegraded feed amino acids were compared to a theoretical optimal profile obtained from the literature using a χ²-index. A low index is equivalent to a high biological value. Smallest and largest index for the difference between the observed and theoretical optimal amino acid profile were obtained for peas and maize, respectively. Lysine was the first limiting amino acid for cereals, sunflower meal, expander treated (142 °C) rapeseed cake and untreated guar meal, leucine for untreated and expander treated (115 °C) rapeseed cake, and methionine for peas and expander treated guar meal. It was concluded that based on the assumed ideal amino acid profile, expander treatment only changed the first limiting amino acid for rapeseed cake and guar meal, and that although expander treatment decreased the index, and thereby improved the biological value of the intestinally digested feed amino acids, the ranking of feeds based on the index was unaffected by expander treatment.     

Effects of microwave irradiation on ruminal protein degradation and intestinal digestibility of cottonseed meal

The objectives of this study were to determine the effects of microwave irradiation on ruminal degradability and intestinal digestibility of crude protein (CP) and to monitor the fate of true proteins of cottonseed meal (CSM) in the rumen. Duplicate nylon bags of untreated or irradiated CSM (microwave power of 800 W for 2, 4 and 6 min) were suspended in the rumen of four non-lactating Holstein cows for up to 48 h, and resulting data were fitted to non-linear degradation model to calculate degradation parameters of CP. Proteins of untreated and treated CSM bag residues were fractionated by gel electrophoresis. Intestinal digestibility of CP was measured using the mobile nylon bag technique. From in situ results, microwave irradiation decreased (P < 0.05) the water soluble fraction and degradation rate, but increased the potentially degradable fraction of CP. The effective degradability of CP decreased (P < 0.05) as processing period increased. Irradiation for 2 and 4 min increased (P < 0.05) intestinal digestibility of ruminally undegraded CP, but extending to 6 min lowered (P < 0.05) the beneficial effect that 4 min had on intestinal CP digestibility. Electrophoretic results indicated that globulin 9S in untreated CSM (whereas globulin 9S, globulin 5S and albumin 2S in microwave irradiated CSM) make the bulk of escaped protein. Based upon these results, microwave irradiation at a power of 800 W for 4 min had the greatest potential to increase digestible undegraded protein.     

Influence of supplemental nitrogen source on digestion of nitrogen, dry matter and organic matter and on in vivo rate of ruminal protein degradation

Seven Holstein steers (340 kg) fitted with ruminal, duodenal and ileal cannulae were used to measure the influence of supplemental N source on digestion of dietary crude protein (CP) and on ruminal rates of protein degradation. Diets used were corn-based (isonitrogenous, 12% CP on a dry matter basis, and isocaloric, 80% total digestible nutrients) with urea, soybean meal (SBM), linseed meal (LSM) or corn gluten meal (CGM) as supplemental N. Ruminal ammonia N concentrations were higher (P less than .05) in steers fed LSM than in those fed CGM, but did not differ from those in steers fed urea or SBM (11.7, 6.7, 9.1 and 9.2 mg/100 ml, respectively). Due to the high degradability of urea, ruminal digestion of dietary CP was greater (P less than .05) in steers fed urea than in those fed CGM, but intermediate in steers fed SBM and LSM (58.4, 48.8, 53.1 and 53.9%, respectively). Flow of bacterial nonammonia N to the duodenum was highest (P less than .05) in steers fed SBM or LSM, intermediate (P less than .05) for urea and lowest (P less than .05) for CGM (86.8, 86.1, 76.3 and 65.9 g/d, respectively). Efficiency of bacterial protein synthesis was lowest in steers fed CGM and differed (P less than .05) from SBM (15.6 vs 21.8 g N/kg organic matter truly digested, respectively). Rate of ruminal digestion for SBM-CP differed (P less than .05) from that of CGM-CP but not from that of LSM-CP (17.70, 5.20 and 10.13%/h, respectively). The slow rate of ruminal degradability of CGM resulted in increased amounts of dietary protein reaching the intestinal tract but lower amounts of bacterial protein, thus intestinal protein supply was not appreciably altered.     

6种饲料原料瘤胃降解特性和瘤胃非降解蛋白质的小肠消化率

本试验旨在研究新疆地区玉米青贮、棉籽壳、苜蓿草粉、苜蓿干草、葡萄籽粕、蕃茄酱渣6种奶牛饲料原料的瘤胃降解特性和瘤胃非降解蛋白质(RUP)的小肠消化率(Idg)。选用3头装有永久性瘤胃瘘管的泌乳荷斯坦奶牛,采用尼龙袋法和改进三步体外法测定饲料原料的干物质(DM)、粗蛋白质(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的瘤胃降解特性以及RUP的Idg和小肠可消化粗蛋白质(IDCP)含量。结果表明:1)苜蓿草粉和玉米青贮的DM有效降解率最高,显著高于次之的苜蓿干草、番茄酱渣(P0.05),葡萄籽粕、棉籽壳最低,显著低于其他原料(P0.05);CP有效降解率为番茄酱渣苜蓿草粉玉米青贮苜蓿干草棉籽壳葡萄籽粕,各原料间差异显著(P0.05);NDF有效降解率为玉米青贮苜蓿草粉棉籽壳苜蓿干草番茄酱渣葡萄籽粕,各组饲料原料间差异显著(P0.05);ADF有效降解率为玉米青贮棉籽壳苜蓿干草番茄酱渣苜蓿草粉葡萄籽粕,各组饲料原料间差异显著(P0.05)。2)苜蓿草粉RUP的Idg和IDCP含量最高,Idg显著高于依次降低的苜蓿干草、玉米青贮、番茄酱渣、葡萄籽粕、棉籽壳(P0.05),IDCP含量与苜蓿干草差异不显著(P0.05),显著高于依次降低的玉米青贮、番茄酱渣、葡萄籽粕、棉籽壳(P0.05)。综上所述,不同饲料原料具有不同的瘤胃降解特性,进入小肠IDCP的含量也不同。玉米青贮的DM、NDF和ADF在瘤胃的有效降解率较高,苜蓿草粉RUP的Idg较高,苜蓿草粉和苜蓿干草的IDCP含量较高。