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1.
本试验以登海605玉米品种为材料,于蜡熟期2/3乳线时进行刈割,乳酸菌制剂的添加量分别为0,10,20和30 mg·kg-1,4个处理,每个处理4个重复,在室温条件下发酵45和90 d,取样测定营养成分、发酵品质和瘤胃降解率等指标,旨在研究不同乳酸菌添加量和发酵时间对全株玉米青贮营养价值的影响。结果表明:干物质(DM)受乳酸菌添加量和发酵时间的影响较小,差异不显著(P>0.05);随乳酸菌添加量的增加,发酵90 d的中性洗涤纤维(NDF)含量显著线性降低(P=0.018),而相对饲喂价值(RFV)显著线性增加(P=0.006)。发酵90 d的酸性洗涤纤维(ADF)含量和pH值较45 d显著降低(P<0.01),而乳酸和乙酸含量显著增加(P<0.05)。随乳酸菌添加量的增加,乳酸含量显著线性增加(P<0.05)。24 h的DM和NDF消化率受乳酸菌添加量和发酵时间的影响较小,差异不显著(P>0.05)。发酵90 d时,48 h DM降解率随乳酸菌添加量的增加显著线性增加(P=0.034),48 h NDF降解率较45 d显著增加(P=0.022)。发酵90 d时,20 mg·kg-1组的RFV、总可消化养分(TDN)和有机酸含量最高,而pH值最低。综上所述,乳酸菌添加量和发酵时间对全株玉米青贮的营养成分含量、发酵品质和DM瘤胃降解率均有显著影响,全株玉米青贮在发酵90 d且乳酸菌添加量为20 mg·kg-1的营养价值和发酵品质最优。  相似文献   

2.
本试验旨在利用尼龙袋法比较不同品种全株玉米青贮前后瘤胃降解特性的差异.试验采用2×3双因素试验设计,选择玉米7367号、玉米7377号、玉米7387号3个全株玉米品种为研究对象,采用尼龙袋法比较3种全株玉米青贮前和青贮后的营养成分和瘤胃降解特性,旨在探讨适合河北省种植的全株玉米青贮品种.结果表明:1)青贮前玉米7377...  相似文献   

3.
Abstract

Two varieties of forage sorghum, low grain Dekalb FS‐5 (FS) and higher grain Pioneer 947 (GS) were harvested at the milk and dough stages of maturity respectively. Each variety was ensiled separately and as mixtures under laboratory conditions. The mixtures comprised FS.GS at ratios of 3:1 and 1:1 respectively. At the milk stage the FS had a dry matter (DM) content of 338 g kg?1 and water‐soluble carbohydrates (WSC) content of 120 g kg?1, as compared with 389 g kg?1 and 63 g kg?1, respectively for the GS. At the dough stage, these contents were 374 g kg?1 and 123 g kg?1 for the FS, and 520 g kg?1 and 29 g kg?1 for the GS, respectively. At the dough stage the GS had higher neutral detergent fibre (NDF) and acid detergent fibre (ADF) contents than FS (592 g kg?1 and 379 g kg?1 vs. 533 g kg?1 and 339 g kg?1 DM, respectively). In the silage harvested at milk stage, the pH of FS alone decreased most slowly, whereas at the dough stage the pH of the GS remained highest. In mixtures the pH decline accelerated with an increasing proportion of FS. Following harvest at the milk stage the 3:1 (FS:GS) had the best ensiling characteristics, whereas following at the dough stage the 1:1 mixture provided the most stable silage. Rumen degradability of the silage of GS was higher than that of the FS silage, especially for material harvested at dough stage of maturity (59.2 g kg?1 vs. 50.9 g kg?1). Mixing FS with GS at the ensiling increased the digestibility of the resulting silage as compared with FS alone.  相似文献   

4.
添加不同水平糖蜜对燕麦青贮的影响   总被引：5，自引：0，他引：5  
以饲用燕麦066为原料,在乳熟期刈割后,对其进行直接青贮和半干青贮,青贮时分别添加0%,2%和4%的糖蜜。青贮后20 d3、0 d4、0 d和50 d进行4次取样分析,从而得出添加不同浓度糖蜜、不同发酵时间和不同水分含量对燕麦青贮效果的影响。结果表明:(1)半干青贮的pH值普遍低于相应的高水分青贮,并且随着添加糖蜜浓度的增加,pH值也随着相应降低;乳酸的变化与pH值呈正相关。其中添加2%和4%的半干青贮效果最好,与其他各处理均呈现显著差异(P<0.05),但两者间差异不显著。(2)添加2%和4%糖蜜的半干青贮中粗蛋白质(CP)和中性洗涤纤维(NDF)的含量显著高于其他各处理组,并且其酸性洗涤纤维(ADF)的含量显著低于其他各处理组,差异显著(P<0.05);但是这两个处理组之间CP,ADF和NDF的含量却无明显差异。(3)当燕麦含水量高时(>80%),即便pH值降到4.2以下,仍然不能抑制腐败微生物的活动。燕麦乳熟期进行刈割,添加2%的糖蜜,使含水量降到70%左右时,就能取得良好的青贮效果。  相似文献   

5.
试验在青稞秸秆与多年生黑麦草以6∶4混合的基础上,添加3%,4%和5%的糖蜜,旨在进一步改善混合青贮发酵品质和营养价值,为西藏地区青稞秸秆青贮利用提供理论依据。结果显示,青贮前14天,糖蜜添加组乳酸含量快速增加,pH值迅速下降。对照组pH值未能降至4.2以下,而糖蜜添加组均在4.0左右,乳酸、水溶性碳水化合物含量和乳酸/乙酸显著高于(P<0.05)对照组,氨态氮/总氮均低于对照组,且添加3%糖蜜已达到优质青贮饲料标准。青贮第60天糖蜜添加组有较高的粗蛋白含量,较低的中性洗涤纤维和酸性洗涤纤维含量,各组体外降解率均高于青贮材料。综合考虑,在青稞秸秆和黑麦草以6∶4混合的基础上添加3%的糖蜜可获得优质青贮饲料。  相似文献   

6.
目的 探究不同晾晒时间和青贮时间对全株青贮玉米发酵品质的影响。方法 以玉米（Zea mays L.）青贮品种“曲辰9号”为试验材料,将乳熟末期的青贮玉米全株收获粉碎后,在阴凉处分别晾晒0（对照,CK）、1、2、3、4 d,然后在塑料桶（5 L）中分别进行青贮,待青贮60、90、120 d时进行发酵品质的评定。结果 青贮玉米的含水量随着晾晒时间的增加而降低,在晾晒2、3、4 d后含水量显著（P<0.05）低于CK;用晾晒2、3、4 d的全株青贮玉米原料进行青贮,pH值显著（P<0.05）高于CK,晾晒2 d青贮120 d处理除外。晾晒时间对乳酸、丁酸、中性洗涤纤维（NDF）和酸性洗涤纤维（ADF）含量均产生显著（P<0.05）影响,青贮时间仅对乳酸、丁酸产生显著（P<0.05）影响,其中,乳酸含量随着青贮时间的延长而增加,丁酸含量在原料晾晒之后明显增加。CK处理中,青贮90、120 d的NDF含量显著（P<0.05）高于青贮60 d处理。利用氨态氮、乙酸、丙酸、丁酸开展V-Score分析,晾晒导致青贮玉米发酵品质降低,试验中品质较优的青贮为原料粉碎后未经晾晒的处理（CK）。结论 在未经晾晒处理下进行青贮60 d的青贮玉米,综合品质较高。在青贮玉米原料含水量为74%时,不建议粉碎之后通过晾晒降低含水量再青贮。  相似文献   

7.
含水量及添加剂对燕麦捆裹青贮品质的影响   总被引：3，自引：0，他引：3  
为了搞清不同含水量和添加剂对燕麦青贮发酵品质的影响,试验设置2个含水量(45%~50%,65%~70%)和5个添加剂处理进行研究。5个添加剂处理分别为玉米粉(4%)、尿素(0.4%)、Synlac Dry(0.002 g/kg)、Sila-Max 200 (0.0025 g/kg) 和直接青贮(CK)。以灌浆期全株燕麦为青贮原料,捆裹青贮40 d后取样,测定其营养指标、发酵指标和主要微生物类群数量。结果表明,含水量与添加剂对燕麦青贮发酵品质的影响非常显著。与45%~50%含水量相比,65%~70%含水量下各处理的CP、主要有机酸含量和LAB数量比较稳定;NDF、ADF、WSC和M&Y数量降低,青贮效果较优。与CK相比,最佳含水量下玉米粉和尿素处理的青贮燕麦NDF、ADF、NH3-N均显著增加(P<0.05),WSC显著减少。Sila-Max 200处理的NDF、ADF含量最低(P<0.05),分别为52.12%和32.14%;LA含量最高,LAB数量也显著提高(P<0.05),抑制了好氧细菌的生长繁殖,效果优于Synlac Dry,青贮品质最佳。综上所述,在65%~70%原料含水量条件下选择合适添加剂处理可显著提高燕麦青贮品质。  相似文献   

8.
凋萎和不同添加剂对紫花苜蓿青贮品质的影响   总被引：1，自引：0，他引：1  
以孕蕾后期至初花期紫花苜蓿为材料,在实验室条件下研究了两种凋萎程度(晾晒3 h和晾晒12 h),对应含水率分别为72.6%和61.8%的苜蓿草分别添加乳酸菌接种剂(LAB)、甜菜粕(SB)、乳酸菌+甜菜粕(LAB+SB)、甲酸钠(SF)、甲酸钠+甜菜粕(SF+SB)五组不同添加剂处理及对照组(CK)对苜蓿青贮发酵品质和主要营养成分含量的影响。青贮65 d开封,对青贮进行了感官评定和实验室评定。结果表明,1)添加剂对苜蓿青贮发酵品质有极显著的影响(P<0.01),各种添加剂均不同程度地提高了苜蓿青贮饲料的发酵品质,显著降低了青贮饲料的pH和氨态氮含量;2)两种凋萎程度下苜蓿青贮的NDF、ADF和干物质回收率均与对照组差异不显著,LAB+SB和SF处理显著提高了青贮饲料WSC的含量(P<0.05),添加SB显著降低了青贮饲料的CP值(P<0.05);3)提高原料的凋萎程度能够改善苜蓿青贮饲料的发酵品质,显著提高青贮饲料的CP和WSC含量(P<0.05)。总体来说,不同添加剂的青贮效果不同,添加LAB+SB的青贮品质最佳。  相似文献   

9.
This experiment aimed to determine the changes in chemical composition, fermentation profile, in situ disappearance characteristics, and nutrient losses of ensiled total mixed ration (TMR) containing steam‐flaked corn or brown rice (BR) during storage. TMRs for dairy cows, containing either steam‐flaked corn or BR at 31.9% with 15.2% rye silage, 40.5% alfalfa silage, 5.0% beet pulp and 7.0% soybean meal, were prepared (dry matter (DM) basis). Each TMR was placed in a plastic drum silo, stored at 23°C in an air‐conditioned room and sampled 0, 7, 14, 30, 90 and 210 days after preparation. In both grain sources, the fermentation products increased, while DM and starch storage losses increased and starch content greatly decreased during storage. The rapidly degradable fraction and effective ruminal degradability of DM, crude protein and starch increased during storage. These changes of dietary characteristics were large during 30 days of storage, but small after 90 days of storage. Replacing corn with BR led to increased fermentation products, starch loss and effective ruminal degradability of the ensiled TMR. These results indicate that the ensiling process of TMR changes the dietary characteristics and replacing corn with BR in TMR had a large impact on these dietary characteristics.  相似文献   

10.
The effects of increasing grain content of sorghum silage at the soft dough or the mature stages on nutrient digestibility, rate of passage and ruminal characteristics were investigated. A hetero-yellow grain sorghum (WAC 710DR) was harvested at the soft dough and the mature stage. Conventional sorghum silage was harvested by harvesting only the material more than 12 cm above the ground, high-energy silage by cutting it at a 40-cm height and headchop by harvesting at a 65-cm height. Regular silage was supplemented with either 17% or 34% grain to provide amounts of grain equal to that in the high-energy silage and headchop; high-energy silage was supplemented with 25% grain to equal the grain content of headchop. Diets were supplemented to 11.0% CP with soybean meal. Grain content was greater for headchop than for regular silage (72% vs 53%) but DM yield was lower (2,900 vs 4,600 kg/ha). Silages harvested at the more mature stage had lower digestibility of DM (62 vs 68%), CP (60 vs 64%), NDF (46 vs 50%), ADF (48 vs 52%) and starch (89 vs 97%). Increasing the height of cut did not increase DM digestibility of the silage. Compared with conventional silage, headchop had depressed NDF (43 vs 51%) and ADF (46 vs 55%) digestibility. Supplementation of silages with grain did not increase digestibility. The failure to increase DM digestibility was not due to depressed fiber or starch digestion, but rather to an increased fecal excretion of cell contents. The digestibility of grain sorghum silage was not improved by increasing the height of cut or adding supplemental grain.  相似文献   

11.
为探讨布氏乳杆菌和甲酸对青藏高原不同物候期燕麦（Avena sativa L.）青贮饲料发酵品质和细菌群落的影响，本试验以开花期、乳熟期和蜡熟期燕麦为原料，设置对照、添加甲酸和添加布氏乳杆菌3个处理，青贮90 d后，测定其营养成分、发酵指标和细菌群落组成。结果表明：布氏乳杆菌和甲酸处理均改变不同物候期燕麦青贮饲料中细菌群落组成（P<0.05），并提高其乳酸细菌相对丰富度；与对照相比，用布氏乳杆菌和甲酸处理不同物候期的燕麦青贮后，蜡熟期的燕麦pH值降低（P<0.05），乙酸均增加9.7%，丙酸分别降低11.6%和8.6%，氨态氮分别降低11.3%和19.2%。综合细菌群落组成、发酵品质和营养成分来看，蜡熟期的燕麦添加布氏乳杆菌和甲酸后，其青贮品质较佳。  相似文献   

12.
We investigated the effects of different rice conservation techniques on in situ ruminal degradation and in vivo nutrient digestibility and rumen fermentation in steers. Raw rice grain was dried before crushing (DRY), ensiled after crushing (ENS‐A), or ensiled before crushing (ENS‐B). Six ruminally cannulated steers were used in a replicated 3 × 3 Latin square design with three dietary treatments: diets containing DRY, ENS‐A, or ENS‐B at 36% of the dietary dry matter. The in situ rapidly degradable fraction and effective ruminal degradability were higher for ensiled rice than for DRY, and higher for ENS‐A than for ENS‐B. The ruminal pH was lower and the lactic acid and total volatile acid concentrations were higher for the steers fed ensiled rice than those fed the DRY diet, but a treatment effect was not observed in the comparison between ENS‐A and ENS‐B. The whole‐tract digestibility of crude protein and ether extract was improved when the rice grain was ensiled, but there were no differences in nutrient digestibility between ensiling methods. These results show that ensiling treatment can be a strategy to improve the nutrient value of rice grain, but the ensiling method has little impact on in vivo digestion.  相似文献   

13.
本研究旨在评定不同蛋白质饲料(豆粕、双低菜籽粕、膨化大豆、玉米蛋白粉、棉籽粕)和粗饲料(苜蓿干草、全株玉米青贮、燕麦草、苜蓿青贮、羊草)的营养价值,并研究其奶牛瘤胃降解特性.选择5头安装永久性瘤胃瘘管的健康荷斯坦牛,采用尼龙袋评定法评定饲料瘤胃有效降解率和动态降解率.结果表明:1)各蛋白质饲料干物质(DM)含量差异不显...  相似文献   

14.
麻叶荨麻与玉米粉混贮对青贮品质的影响   总被引：1，自引：0，他引：1  
为解析添加玉米粉对麻叶荨麻青贮发酵品质和养分保存效果的影响,将麻叶荨麻与玉米粉5∶1混合调制青贮饲料,将其DM含量提高到310 g/kg,以麻叶荨麻单独青贮作为对照。每个处理18个重复,室温袋贮60 d后开封取样,测定青贮发酵品质和营养成分及消化率,并分别在贮藏后第0,3,5,15,20和60天调查pH、有机酸、氨态氮的动态变化。结果表明,与玉米粉混合青贮通过快速降低pH和提高乳酸含量而明显加快了麻叶荨麻的发酵进程,发酵前15 d,混贮组pH下降速率和乳酸累积速率较单贮组快;混贮组显著降低了(P<0.05)pH、氨态氮、乙酸、丁酸及NDF和ADF含量,显著提高了(P<0.05)乳酸、水溶性碳水化合物(WSC)含量、费氏评分及干物质与纤维组分的体外消化率;脂肪含量在两个处理之间无显著差异。以上结果表明,麻叶荨麻与玉米粉以5∶1混合青贮能够成功保存麻叶荨麻的高品质营养特性,从而生产高品质青贮饲料,同时还能改善家畜对它的利用效率。  相似文献   

15.
In order to better utilize the last cut alfalfa harvested before killing frost in a high moisture environment, the effects of chemical additives on the quality of alfalfa silage were studied in south of China. The alfalfa was freshly harvested at branching stage, and wilted by dry matter content of about 300 g/kg (fresh matter basis). Silage was prepared by using a small‐scale silage fermentation system, where sucrose, potassium citrate, sodium carbonate, formic acid, acetic acid and propionic acid were used as silage additives, and no additives served as control. These silos were stored at ambient temperature (5‐20°C), and the silage qualities were analyzed after 120 days of fermentation. All additive treatments affected the chemical composition and N distribution, increased the water‐soluble content and crude protein contents, decreased non‐protein nitrogen (NPN) content, and enhanced the in vitro ruminal dry matter digestibility (except for sodium carbonate). Silages treated with organic acids were preserved with significantly (P < 0.05) lower pH value, ethanol content and NPN content compared with control. When the fermentation quality, chemical composition and N distribution were considered, the treatment with sucrose or organic acids resulted in high quality of alfalfa silage ensiled before killing frost, with formic acid having the best effect.  相似文献   

16.
The objective of this study was to determine the changes to residual plant feeding value of early‐ and late‐maturing maize varieties. The influence of the cell wall carbohydrate composition, in terms of neutral and acid detergent fibre (NDF and ADF) content, NDF and dry matter (DM) degradability, and in vitro organic matter digestibility and gas production on the feeding value of a range of maize genotypes, was measured. The different genotypes were allotted into two maturity groups (MG I – early to mid‐early: S210‐S240; MG II – mid‐late to late: S 250‐S280) and harvested at four different harvest dates (depending on the DM content of the kernels). The maize varieties of MG I had lower NDF and ADF contents and higher ruminal DM degradability, in vitro digestibility and gas production and thus a higher feeding value than MG II at the same stage of physiological maturity. A strong negative relationship between NDF content and the ruminal DM degradability (r = ?0.81) was observed. The data indicate that the early‐maturing varieties permit a larger flexibility in harvesting due to a longer period of starch inclusion into the kernel whilst simultaneously maintaining a good supply of rumen‐available fibre. Conclusively, the higher feeding value of the early‐maturing varieties, based on lower NDF and high DM digestibility, permits more flexibility in the harvesting period over the later‐maturing varieties.  相似文献   

17.
为了提高水稻秸秆的青贮发酵品质,本研究旨在从黑白花奶牛瘤胃中筛选出具有降解纤维素能力的兼性厌氧复合菌系,探讨其对水稻秸秆青贮过程中结构性碳水化合物降解及发酵品质的影响。试验采集了黑白花奶牛瘤胃内容物,经富集培养、刚果红染色初筛,耐酸诱导,滤纸降解复筛,酶活力测定,获得高效兼性厌氧纤维素降解复合菌系M6。试验设4个处理组：1）水稻秸秆直接自然青贮（CK）组;2）灭菌后水稻秸秆青贮（IRR）组;3）灭菌水稻秸秆接种复合乳酸菌（CLAB）青贮组;4）灭菌水稻秸秆接种复合菌系（M6）青贮组,分别于青贮3、6、15、45、60和90 d后开窖取样分析。结果表明,青贮3 d后,M6处理组pH始终低于其他各组,青贮第60天达到最低值（4.62）。青贮45 d后,M6处理组乳酸含量始终显著高于其他各组（P<0.05）,且在青贮90 d达到最高值（23.90 g·kg-1 DM）。青贮15 d后,中性洗涤纤维、酸性洗涤纤维和纤维素含量在M6组均显著低于其他各组（P<0.05）,且在第90天达到最低值。青贮60 d后,IRR和M6组保持较高水平的水溶性碳水化合物含量,其次为CLAB组。综上所述,复合菌系M6在水稻秸秆青贮过程中具有降解粗纤维和促进乳酸发酵的作用,添加纤维素降解复合菌系可有效改善水稻秸秆青贮发酵品质,为青贮添加剂的研发与应用提供了理论依据。  相似文献   

18.
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。  相似文献   

19.
为筛选适宜在甘肃省二阴地区种植的优质青贮燕麦品种,采用随机区组设计方法,在甘肃省定西市通渭县华家岭乡研究了7个燕麦品种(陇燕1号、陇燕3号、定莜7号、坝莜9号、坝莜3号、白燕2号和晋燕17号)的产量表现和青贮发酵品质。于燕麦乳熟期刈割,分析鲜草的营养成分和微生物组成,切短至2 cm后直接青贮。60 d后开封取样,测定其营养指标、发酵指标,并进行发酵品质评定。结果表明:1)品种间鲜草产量和干物质含量差异显著(P<0.01),陇燕3号鲜草产量最高,达45257 kg·hm-2,比定莜7号(35320 kg·hm-2)高出28.13%。供试品种的干物质含量为31.35%~35.36%。尽管在同一块地上生长,但不同品种植株上附着的微生物组成差异显著(P<0.01),定莜7号的乳酸菌数达105 cfu·g-1 FM,高于其他品种,有害微生物数量较少。2)青贮60 d后,品种间营养成分差异显著(P<0.01),陇燕3号和定莜7号的干物质含量最高,粗蛋白含量显著(P<0.01)高于其他品种,分别为10.12%和11.09%。坝莜3号(55.78%)、陇燕3号(54.27%)和定莜7号(52.16%)的中性洗涤纤维含量显著(P<0.01)高于其他各品种,陇燕3号的酸性洗涤纤维含量低于坝莜3号和定莜7号,半纤维素含量最高。3)不同品种的发酵品质差异也极显著(P<0.01)。定莜7号的pH值最低(4.13),陇燕3号次之(4.20),晋燕17号为最高(4.53)。定莜7号、陇燕3号和坝莜3号拥有较高的乳酸含量,较低的总挥发性脂肪酸和氨态氮含量,发酵品质良好。坝莜9号和晋燕17号表现较差。4)感官评定和V-Score评分结果基本一致,以陇燕3号和定莜7号的发酵品质最优,感官评定结果为1级,V-Score评分为优。综合考虑产量、营养成分和青贮发酵品质,陇燕3号适宜作为青贮燕麦品种在通渭县及类似的二阴地区种植。  相似文献   

20.
以第2茬初花期(10%植株开花)刈割的紫花苜蓿为原料进行青贮,针对甲酸添加剂和青贮时间设计两因素试验,甲酸添加剂浓度为3(A1)、6(A2)和9 mL·kg-1(A3),以不添加作为对照(CK),分别在发酵30、60和120 d开袋分析。结果表明,适量的甲酸添加剂和适当的青贮时间能够改善青贮品质,甲酸添加剂能够显著降低青贮的pH、氨态氮/总氮及酸性洗涤纤维(ADF)值(P<0.05);除粗蛋白(CP)外,青贮时间对青贮原料的其他营养品质均有显著影响(P<0.05),在所有处理中,甲酸添加剂浓度6 mL·kg-1(A2),青贮时间60 d,苜蓿青贮效果最佳;甲酸添加剂和青贮时间的交互作用显著影响了干物质(DM)、中性洗涤纤维(NDF)和粗脂肪(EE)含量(P<0.05),对其他成分无显著影响(P>0.05)。  相似文献   

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