体外法与半体内法评价不同酶菌制剂处理后玉米秸秆主要成分降解率的比较试验

文章利用体外产气法和半体内法评定不同酶菌制剂组合处理的玉米秸秆瘤胃干物质降解率,旨在探索最佳的酶菌处理结果和有效的评价方法。试验处理分别为对照组(CON)、青贮对照(CS)组、复合酶(CPL)组、复合酶单菌(CPLP)组和复合酶双菌(CPLB)组5个处理组。采用体外产气试验和半体内(尼龙袋)方法分别测定饲料体外产气量(GP)、体外干物质降解率(IVDMD)、半体内干物质降解率(DMD),并进行相关性分析。结果表明:(1)CPLP组的GP72 h及理论最大产气量均最高,GP72 h是52.33 ml,显著高于CON、CS、CPL组(P0.05),与CPLB组差异不显著(P0.05),GP72 h从大到小依次为CPLPCPLBCPLCSCON;(2)CPLB处理组的DMD72 h和干物质有效降解率(ED)均为最大,DMD72 h比CON、CS、CPL的降解率依次提高了41.80%、15.26%、23.69%;与CPLP差异不显著(P0.05);(3)经过相关性分析,DMD24 h与GP24 h、IVDMD24 h的相关系数分别为0.827和0.751;DMD24 h与GP48 h、IVDMD48 h的相关系数分别为0.847和0.745;DMD48 h与GP24 h、IVDMD24 h的相关系数分别为0.804和0.828;DMD48 h与GP48 h、IVDMD48 h的相关系数分别为0.842和0.830。体外产气法和半体内法均表明,CPLP组和CPLB组的饲用价值明显优于CPL组、CS组和对照组。体外产气法与半体内法测定的瘤胃降解率存在极显著相关性,可以利用体外产法来测定玉米秸秆的瘤胃降解率。     

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...     

体外产气法研究中性洗涤纤维/淀粉不同比例饲粮的降解特性

为研究饲粮中不同中性洗涤纤维(NDF)/淀粉(starch)对绵羊瘤胃体外发酵的影响,试验配制NDF/starch为0.8、1.0、1.2和1.4的4种饲粮,采用体外产气法测定48 h动态产气量(GP)和发酵参数,采用尼龙袋法测定NDF、酸性洗涤纤维(ADF)和体外干物质降解率(IVDMD),并计算降解参数.结果 表明...     

4种全株高粱青贮的饲用价值评定

本试验在测定4种全株高粱青贮的常规营养成分及单宁含量的基础上,采用体外产气法和尼龙袋法对其饲用价值进行评价。选取4个品种高粱（晋糯3号、辽甜1号、晋杂2001和晋杂1531）制作全株高粱青贮饲料,开桶后测定其常规营养成分及单宁含量。采用体外模拟瘤胃发酵和尼龙袋法测定4种全株高粱青贮不同发酵时间的产气量和干物质（DM）、粗蛋白质（CP）、中性洗涤纤维（NDF）和酸性洗涤纤维（ADF）消失率,并计算降解参数。结果显示：1) 4种全株高粱青贮的淀粉、CP含量分别在10.94%～24.30%和4.50%～7.50%,不同品种之间均存在显著差异（P<0.05）,但均以晋糯3号的含量最高,晋杂2001次之,辽甜1号最低。2)4种全株高粱青贮的72 h产气量、发酵液pH和总挥发性脂肪酸（TVFA）浓度均无统计学差异（P>0.05）,但辽甜1号全株高粱青贮的发酵液乙酸浓度及乙丙比显著高于其他3个品种（P<0.05）。3）晋糯3号全株高粱青贮的DM消失率在48 h内显著高于其他3个品种（P<0.05）,在72 h时显著高于晋杂1531和辽甜1号（P<0.05）,且其DM有效...     

应用康奈尔净碳水化合物-蛋白质体系和瘤胃降解特性比较糟渣类粗饲料的营养价值

本试验旨在应用康奈尔净碳水化合-蛋白质体系(CNCPS)和瘤胃降解特性比较3种糟渣饲料营养价值及其作为肉羊粗饲料资源的可行性。采集山西晋中地区有代表性的酿酒葡萄皮渣、醋糟和酒糟,每种样品各采集3个样本,利用CNCPS模型测定营养成分进行碳水化合物和蛋白质组分的剖分,同时利用尼龙袋法测定3种粗饲料的干物质(DM)、粗蛋白质(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的瘤胃降解参数。结果表明:酒糟的CP含量显著高于葡萄皮渣和醋糟(P<0.05),NDF、ADF和酸性洗涤木质素(ADL)显著低于其他两者(P<0.05);蛋白质组分中不可降解氮三者差异不显著;酒糟快速降解碳水化合物和中速降解碳水化合物显著高于其他两者(P<0.05),不可利用碳水化合物显著低于其他两者(P<0.05);酒糟的CP、DM和NDF有效降解率显著高于醋糟(P<0.05)。可见,酒糟的营养价值高于葡萄皮渣和醋糟,可替代部分常规粗饲料添加到肉羊日粮中。     

酒糟分类及应用中应注意的问题

1 酒糟主要有几种,在实际应用中应注意什么? 酒糟主要包括白酒糟、啤酒糟和酒精糟等,白酒糟是以高粱、山薯和大米等为原料生产白酒后的副产品,一般干物质中粗蛋白含量为20%～25%,粗纤维含量为11%～17%.     

体外产气法与尼龙袋法评定青海当地燕麦青干草营养价值

试验选用3头装有永久性瘤胃瘘管的4岁1/2野血大通牦牛作为试验动物,同时运用尼龙袋法和体外产气法评定青海当地燕麦青干草营养价值。结果表明,燕麦青干草中粗蛋白质含量为7.17%,粗脂肪含量为2.23%,中性洗涤纤维含量为54.86%,酸性洗涤纤维含量为29.15%;72 h干物质降解率产气法测定值为87%,尼龙袋法测定值为80.56%;估测得出燕麦青干草有机物质消化率89.30%,代谢能为13.99(MJ/kg DM)。用尼龙袋法测定的燕麦青干草的干物质降解率在4、6、8 h均略高于体外产气法测定值, 12、24、36、48、72 h测定的干物质降解率均略低于产气法测定值,但差异均不显著（P＞0.05）。对2种方法测定值作相关性分析,得出r＝0.98,表明这2种方法所测定出来的数据正相关。     

酒糟的综合开发与应用

酒糟包括白酒糟、啤酒糟、酒精糟等。其中白酒糟是生产白酒后的副产品，常以高粱、山薯、大米等为原料，一般干物质中含粗蛋白20％～25％，粗纤维11％～17％。啤酒糟为酿造啤酒的副产品，常用小麦麸、大麦、稻谷皮等为原料，一般干物质中含粗蛋白29．1％，粗纤维16．7％。酒糟除了含有蛋白质外，还含有纤维素、聚戊糖、灰分、脂肪、焦糖、黑色素以及丰富的B族维生素和生长素等物质，营养价值比较丰富。     

体外产气法和尼龙袋法评定苎麻的饲用价值

本试验通过体外产气法和尼龙袋法对苎麻叶片、苎麻全株以及苎麻去纤维全株的饲用价值进行评定。采用体外产气法测定苎麻叶片、苎麻全株以及苎麻去纤维全株的72 h动态产气量,并求得产气参数;用上述3种原料进行尼龙袋试验,测定干物质(DM)、粗蛋白质(CP)、中性洗涤纤维(NDF)及酸性洗涤纤维(ADF)的降解率,求得降解参数。结果表明:1)产气试验中,苎麻全株72 h产气量及理论最大产气量均最高,显著高于最低的苎麻去纤维全株(P0.05),苎麻叶片居中,苎麻叶片与其他二者差异不显著(P0.05)。2)尼龙袋试验中,DM、CP、NDF及ADF的72 h降解率均为苎麻叶片苎麻全株苎麻去纤维全株;DM、NDF、ADF有效降解率也呈现相同的变化规律;然而CP有效降解率则表现为苎麻全株苎麻叶片苎麻去纤维全株。从体外产气量和有效降解率来看,苎麻叶片和苎麻全株的饲用价值要优于苎麻去纤维全株。     

白酒糟、啤酒糟和米酒糟对肉鸡的营养价值比较

本试验旨在比较白酒糟、啤酒糟和米酒糟在肉鸡上的营养价值。试验选取24只平均体重为(1.00±0.12)kg的42日龄湘黄肉公鸡,随机分为4组,每组6个重复,每重复1只鸡。按照4×4拉丁方设计,4组肉鸡分别饲喂100%基础饲粮、80%基础饲粮+20%白酒糟、80%基础饲粮+20%啤酒糟、80%基础饲粮+20%米酒糟。预饲7 d后连续4 d收集鸡只的粪便,测定酒糟、饲粮和粪便的养分含量,应用套算法计算白酒糟、啤酒糟和米酒糟的养分表观消化率。结果显示:米酒糟、白酒糟、啤酒糟的表观消化能分别为7.11、8.39、12.26 MJ/kg;粗脂肪含量分别为8.65%、7.66%、0.44%;粗纤维含量分别为11.22%、4.78%、21.61%。啤酒糟的粗脂肪表观消化率为25.64%,与白酒糟的28.54%差异不显著(P0.05),但显著低于米酒糟的59.56%(P0.05)。白酒糟的粗纤维表观消化率为55.41%,显著高于啤酒糟的38.74%和米酒糟的30.05%(P0.05)。白酒糟的各氨基酸表观消化率介于25.67%~62.27%,米酒糟的介于15.22%~79.04%,啤酒糟的各氨基酸表观消化率要稍高些,介于50.72%~90.10%。总之,不同酒糟间养分含量及养分表观消化率差异较大,啤酒糟虽粗纤维含量高,但其氨基酸表观消化率普遍较高。     

The effect of grain species, processing and time of feeding on the efficiency of feed utilization and microbial protein synthesis in sheep

This study investigated the effect of cereal grain species (sorghum, wheat, oats and barley), extent of processing (cracked barley, finely ground barley, and wet whole barley) and time of feeding (barley grain mixed with ryegrass hay or fed 2 h before hay was fed), on whole tract dry matter digestibility (WTDMD), and microbial protein synthesis (MPS), as a supplement to ryegrass hay when fed to rumen-cannulated sheep.Expected dry matter digestibility (EDMD) in mixtures of cereal grain and ryegrass hay was calculated by interpolation between in vitro dry matter digestibility (DMD) of each grain and the ryegrass hay. These were compared with measured actual WTDMD to detect positive or negative associative effects. Among grain species, the percentage difference in digestibility between actual WTDMD and EDMD was negative at − 6.6% units for wheat but positive at + 2.3%, + 4.3% and + 5.7% units for sorghum, oats, cracked or finely ground barley, respectively.As expected, the supplementation of sheep fed ryegrass hay with different sources of carbohydrates increased urinary allantoin output (as an indicator of MPS) when compared to sheep fed ryegrass hay alone. The concentration of urinary allantoin was significantly higher in sheep supplemented with sorghum (1916 mg/sheep/day) than wheat, oats or cracked barley ([mean ± S.E.M.] 1451 ± 24 mg/sheep/day) grain. There was a significantly higher urinary allantoin concentration in sheep fed cracked barley compared to finely ground barley or wet whole barley (1479 vs. 1095 vs. 1031 mg/sheep/day, respectively). There was no significant (P > 0.05) difference in urinary allantoin output, expressed as output/kg DM intake, when cracked barley was mixed and fed with the hay or fed 2 h before hay. However, in terms of total output of allantoin this was significantly higher (P < 0.05) (1479 vs. 1209 mg/sheep/day).In sacco degradability characteristics of organic matter and nitrogen for sorghum, oats, wheat, barley at different levels of processing and for ryegrass hay were also measured in the rumen of cannulated sheep.Among grain species, wheat had the highest effective organic matter degradability in the rumen (78.1%) while sorghum had the lowest. The effective degradability of protein of finely ground barley in the rumen was found to be higher than cracked barley or wet whole barley.Wheat grain, being highly degradable in the rumen, had a negative effect on WTDMD. In contrast, sorghum grain, being more slowly degradable in the rumen, would be expected to provide a substantially increased supply of energy to microbes over time in the rumen for MPS.Both cracked barley and finely ground barley also had a positive associative effect on WTDMD when fed with ryegrass increasing it by 5.7% units. The MPS was significantly higher (P < 0.05) in sheep fed cracked barley compared to finely ground barley or wet whole barley. This supports the hypothesis that slowly degrading carbohydrate sources synchronise more closely with available N from degradation of forage in the rumen.     

象草细胞壁成分与干物质体外消化率关系分析

以提高干物质体外消化率(IVDMD)为目标,在保持一定干物质产量的同时,通过研究象草细胞壁成分与消化率之间的关系,确定影响干物质体外消化率的细胞壁成分,为筛选高消化率象草育种材料和选育品种提供依据.结果表明:矮生多蘖、较高中蘖、较高少蘖以及高大少蘖型于物质体外消化率依次增加,细胞壁成分NDF、ADF、ADL、HEM、CEL含量则依次降低;第一次刈割时的叶片、茎鞘干物质体外消化率均明显高于第二次刈割,同一刈割时期的茎鞘干物质体外消化率显著高于叶片.叶片干物质体外消化率与NDF、CEL含量表现为显著或极显著负相关,茎鞘干物质体外消化率与NDF、ADF、CEL、ADL含量以及ADL/HEM、ADL/CEL、ADL/(HEM+CEL)比值之间表现为显著或极显著负相关.对IVDMD与细胞壁成分进行主成分分析可得两个较为稳定的主成分,一为ADL含量及ADL/CEL、ADL/(HEM+CEL)比值,二为HEM含量及HEM/CEL比值,因此认为ADL、HEM含量为象草细胞壁成分中影响干物质体外消化率的的主要因素.     

不同栽培利用模式对全株玉米青贮品质的影响

通过对不同玉米品种筛选和栽培利用模式的研究,筛选出适于本地区种植的优质玉米青贮品种,并确立优质青贮玉米最佳栽培利用模式.研究结果表明:乳熟期、蜡熟期和完熟期全株玉米青贮含水量在62%～71%,均可制作出优质青贮,青贮pH值平均为3.76,乳酸、乙酸、丙酸和丁酸含量平均为3.139%、0.358%、0.063%和0.066%,青贮粗蛋白质、粗脂肪含量、体外干物质消化率、体外有机物消化率和产奶净能比青贮前显著增加(P＜0.05),中性洗涤纤维、酸性洗涤纤维和酸洗洗涤木质素含量比青贮前显著降低(P＜0.05).种植密度对全株玉米青贮的常规营养成分含量、范氏纤维含量、体外干物质消化率、体外有机物消化率和产奶净能无显著影响(P＞0.05);施尿素(150～450 kg/hm2)对全株玉米青贮的粗蛋白质含量、粗纤维含量、中性洗涤纤维、酸性洗涤纤维、酸洗洗涤木质素、体外干物质消化率、体外有机物消化率和产奶净能有显著影响(P＜0.05),300kg/hm2尿素水平的营养品质和青贮品质均优于150kg/hm2和450kg/hm2尿素水平,且蜡熟期品质最为优异.     

Characteristics of Forage Nutritional Quality and Digestibility in Different Types of Grassland in Qinghai Tibet Plateau and their Correlation北大核心CSCD

In order to explore the differences of forage nutritional quality and digestibility among different types of rangelands, five typical rangeland types (alpine meadow, alpine steppe, warm steppe, desert steppe and warm desert steppe) in Qinghai-Tibet Plateau were used as research objects. The characteristics of forage nutritional quality and digestibility of typical rangelands and their correlation were analyzed. The results showed that: there were significant differences in crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF) and dry matter digestibility (DMD) among different types of rangeland (P<0.01). The results of Pearson correlation analysis showed that there was a significant positive correlation between DMD and CP (P<0.05), and a significant negative correlation between DMD and NDF and ADF (P<0.05). Elevation (ELE) was positively correlated with DMD and CP (P<0.05), but negatively correlated with NDF and ADF(P<0.05). In conclusion, there were significant differences in CP, ADF, NDF and DMD among different types of grasslands in Qinghai-Tibet Plateau, and it mainly manifested that with the increase of altitude, ADF and NDF gradually decreased, while CP and DMD gradually increased, and forage quality gradually increased. © 2019 Authors. All rights reserved.     

刈割对不同品种褐色中脉饲用高粱饲草品质及农艺性状的影响

利用9个褐色中脉（bmr）饲用高粱（Sorghum bicolor）（23402,23419,Sweet Virginia,PACF8423,22053,22043,SS2,Ehorma和Brasero）品种,研究2种刈割方式（年刈割1次和年刈割2次）对饲草饲用品质（干物质体外消化率（IVDMD）、中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）、可溶性碳水化合物（WSC）和粗蛋白（CP）含量）和农艺性状（株高、茎粗、叶茎比）的影响,并分析农艺性状和饲草品质的相关性。结果表明：年刈割2次与年刈割1次相比,茎粗和株高下降,而叶茎比增加,饲草的WSC含量、NDF和ADF含量下降,而IVDMD和CP含量上升,年刈割2次能有效改善bmr品种的饲草品质。年刈割2次和年刈割1次的SS2,22043和Sweet Virginia饲草品质均表现较高水平,优于其他品种。叶茎比、茎粗与IVDMD、CP含量和WSC含量正相关,与NDF和ADF含量负相关。株高与IVDMD负相关,与NDF含量正相关。株高较低、叶茎比高、茎粗较粗的bmr品种具有较高的饲用品质,叶茎比、株高和茎粗可作为筛选高消化率bmr品种的辅助形态指标。     

Evaluation of associative effects on ruminal digestion kinetics between pasture and grains using in vitro gas production method

In vitro gas production (GP) method was used to investigate associative effects on ruminal digestion when grains (corn or barley) were supplemented to spring pasture and autumn pasture. Pasture (75%) was incubated with 25% corn or barley and gas production was monitored up to 96 h. After incubation, the residues were used to determine dry matter and organic matter digestibility (DMD and OMD). Gas production parameters were analyzed by applying a single exponential equation. Organic matter effective degradability (OMED) was determined from GP parameters and OMD. The positive associative effects on the rate of GP, DMD, OMD and OMED were observed when spring pasture was incubated with corn. However, similar effects were not observed in a barley mixture. However, for autumn pasture, both corn and barley mixtures showed positive associative effects on rate of GP, OMD and OMED. The results of this study indicated that supplementation of corn would be better than barley for spring pasture with high water‐soluble carbohydrate contents, whereas both grain supplementations were effective to obtain positive associative effects on the rate of GP and OMED for autumn pasture with high cell wall content.     

An evaluation of barley in starter diets for swine

Four growth trials and one digestibility trial were conducted to determine the effects of substituting barley for grain sorghum in weanling pig diets on pig performance and nutrient digestibility. Experiments 1 and 2 were 35-d growth trials in which barley was substituted for gain sorghum at levels of 0, 10, 20, 30 and 40% of the diet. Average daily gain (ADG), average daily feed intake (ADFI) and feed conversion (F/G) were not affected by dietary barley level (P greater than .50). Experiment 3 was a digestibility trial conducted to determine the apparent digestibility of dry matter (DMD), gross energy (GED), and N (ND) and percentage of N retained (%NRT) of pigs fed the 0, 20 and 40% barley diets. As dietary barley level increased, DMD and GED decreased linearly (P less than .05), whereas %NRT increased linearly (P less than .10). Apparent N digestibility was not affected by dietary treatment (P greater than .12). Experiments 4 and 5 were 35-d growth trials with treatments arranged in a 2 x 3 factorial design to determine the effects of barley particle size (fine, 635 microns or medium, 768 microns) and dried whey level (0, 10 or 20%) on pig performance. Average daily gain and ADFI increased linearly (P less than .01) as whey level increased. Pigs fed diets containing fine-ground barley grew faster and were more efficient (P less than .05) than those fed medium-ground barley diets.(ABSTRACT TRUNCATED AT 250 WORDS)     

Evaluation of selected high-starch flours as ingredients in canine diets.

Cereal grains represent 30 to 60% of the DM of many companion animal diets. Once incorporated into a diet, the starch component of these grains can provide an excellent source of ME. However, crystallinity and form of starch are variable and can cause incomplete digestion within the gastrointestinal tract. Diets fed in this experiment included one of six high-starch flours as the main source of carbohydrate. The flours originated from barley, corn, potato, rice, sorghum, and wheat. The diets were extruded and kibbled. Starch fraction concentrations of flours consisted of nearly 100% rapidly digestible starch (RDS) and slowly digestible starch (SDS) combined. Starch fraction concentrations of diets paralleled concentrations in flours. Flours varied widely in concentrations of CP, fat, starch, and total dietary fiber. Ileal OM and CP digestibilities were lowest for the potato flour treatment (74 and 64%, respectively). Ileal and total tract starch digestibilities were different (P<.05) among treatments; however, the starch component of all diets was nearly completely digested (>99%). Total tract digestibility of DM and OM was lowest for sorghum (80 and 84%, respectively) compared to all other diets. Crude protein digestibility was highest for corn (87%). Wet fecal weights tended (P<.08) to be greatest for dogs fed the barley treatment (175 g/d). However, dry fecal weights (dried at 55 degrees C) were greatest for dogs consuming the sorghum diet (51 g/d). Fecal scores were consistently greater (i.e., looser stools) for the barley treatment. Any of these flours could be used without negative effects on digestion at either the ileum or in the total tract. Fecal consistency data for dogs consuming the barley treatment indicate that diets containing large amounts (>50%) of barley may not be advantageous for dog owners who house their animals indoors for most of the day.     

玉米类型和籽粒成熟期影响秸秆营养成分与活体外消化率的比较研究

本试验以两个高油玉米品种(HOC298和HOC647)、两个普通玉米品种(CAU80和CAU3138)和一个饲料专用玉米品种(FC3)为试验材料,分析比较不同类型玉米和籽粒成熟期(1/2、3/4和4/4乳线期)对玉米秸秆主要营养成分含量和干物质、纤维组分消化率的影响。结果表明:高油玉米秸秆的水溶性糖、淀粉、粗脂肪含量和干物质、N DF、ADF消化率明显高于普通玉米秸秆P(<0.01),而NDFA、DF和木质素含量则低于普通玉米秸秆P(<0.01),饲料专用玉米秸秆的上述指标则介于二者之间。随籽粒成熟度的提高,高油玉米秸秆水溶性糖、淀粉、粗脂肪含量和干物质、NDF消化率呈直线规律提高L(P;<0.01),而NDF、ADF和木质素含量则直线规律下降L(;P<0.001),其中,4/4乳线期的水溶性糖、淀粉含量和干物质消化率分别比l/2乳线期提高26.5倍、2.4倍和22.7%,而NDF、ADF和木质素分别比1/2乳线期减少24.1%、30.6%和38.4%。随籽粒成熟期的延长,普通玉米品种秸秆的水溶性糖、淀粉含量和干物质NDF消化率直线下降L(;P<0.01),而NDF、ADF和木质素含量直线提高L(P;<0.05)。饲料专用玉米秸秆的营养成分和活体外消化率指标介于高油和普通玉米秸秆之间。本试验结果表明,高油玉米秸秆具有营养物质含量高和消化率高的特点,是反刍动物理想的粗饲料和青贮饲料原料。