共查询到20条相似文献，搜索用时 62 毫秒
1.
从现蕾至盛花期(80%开花期)分四次取样,测定紫花苜蓿的茎叶比、粗蛋白质、粗纤维含量,以研究刈割时期对苜蓿叶粉质量的影响,确定合理刈割期。研究结果表明:随刈割期推迟,叶比例在初花期后极显著下降(P<0.01);叶蛋白质含量各时期间均差异显著(P<0.01);叶中粗纤维含量随着长时期延长显著提高(P<0.05),中花期后,粗纤维含量极显著高于现蕾期和初花期(P<0.01)。生产紫花苜蓿叶粉适宜刈割期为现蕾至初花期。 相似文献
2.
刈割期对紫花苜蓿叶粉营养成分的影响 总被引：10，自引：8，他引：2
从现蕾至盛花期(80%开花期)分4次取样,测定W323紫花苜蓿Medicago sativa各样本的茎叶比和叶中粗蛋白含量、粗纤维含量,以研究刈割时对苜蓿叶粉质量的影响,确定合理刈割期.研究结果证明:随刈割期推迟,叶比例在10%开花期后极显著下降(P＜0.01);叶蛋白质含量各时期间均差异极显著(P＜0.01);叶中粗纤维含量随刈割时期推迟显著提高(P＜0.05),50%开花后,粗纤维含量极显著高于现蕾期和10%开花期(P＜0.01).生产紫花苜蓿叶粉适宜刈割期为现蕾至10%开花.以现蕾期为基础,叶比例、叶粗蛋白含量、叶粉容重均与现蕾后刈割期推迟日数呈负相关,而叶粗纤维与之呈正相关.叶粗蛋白含量与叶粉容重显著正相关,可通过叶粉容重估算叶粉中粗蛋白含量. 相似文献
3.
对不同刈割期和晒制方法处理的沙打旺青干草中的粗蛋白质和粗纤维素含量进行方差分析 ,结果表明 :初花期刈割 ,其青干草的粗蛋白质含量极显著 (P <0 0 1)高于盛花期 ;同样其粗纤维素含量极显著 (P <0 0 1)低于盛花期。搭架晒干其粗蛋白质含量极显著 (P <0 0 1)高于小捆晒制和薄层摊晒 ,分别提高了1 18%和 2 18% ;粗纤维素极显著降低 (P <0 0 1)。因此 ,在初花期选择晴朗天气刈割 ,采用搭架晒干可获得优质、高产的沙打旺干草。 相似文献
4.
5.
通过分析内蒙古地区种植的紫花苜蓿、黄花苜蓿、草原2号苜蓿在不同生育期总皂苷含量的变化,并利用SPSS11．5统计软件进行方差分析,并采用Duncan法进行均值的多重比较。结果表明,返青期到初花期的植株总皂苷含量为紫花苜蓿〉草原2号苜蓿〉黄花苜蓿,紫花苜蓿的总皂苷含量极显著高于黄花苜蓿（P〈0．01）;在盛花期和结荚期,草原2号苜蓿的总皂苷含量高于其他2个品种;成熟期黄花苜蓿的总皂苷含量最高。紫花苜蓿与草原2号苜蓿在结荚期的植株总皂苷含量显著大于其他生育期（P〈0．05）,黄花苜蓿的总皂苷含量在盛花期达到最大。 相似文献
6.
不同刈割时期与刈割高度对苜蓿品质的影响 总被引：2，自引：0，他引：2
为研究不同刈割时期与刈割高度对苜蓿品质的影响,开展不同刈割时期和刈割高度对紫花苜蓿干草质量影响的研究,以1：1比例种植的金皇后（Golden Empress）与三得利（Sanditi）紫花苜蓿为试验材料,于不同生育时期与刈割高度进行干草产量和营养成分测定。结果表明：与初花期收获的苜蓿相比,苜蓿生长高度80 cm（现蕾期）左右时刈割,鲜草产量和干草产量比初花期分别高2510.4 kg·hm-2和807.3 kg·hm-2,粗蛋白（Crude Protein,CP）量和相对饲用价值（Relative Feed Value,RFV）值分别高2.45%、1.35,差异极显著（P<0.01）。综合得出,在赤峰地区,以生长高度为刈割标准,株高在80 cm左右时刈割可以得到质量兼优的苜蓿草。 相似文献
7.
分别于2013年7月上中旬和8月上中旬对新疆维吾尔自治区伊犁哈萨克自治州昭苏马场人工割草地进行刈割,并进行了产草量测定和牧草品质的比较分析。结果表明,刈割时期对建植第3年和第7年割草地的鲜草和干草产量无明显影响;8月上中旬刈割牧草的粗蛋白（CP）含量与7月上中旬刈割牧草相比显著降低（P〈0．05）;刈割牧草中。豆科牧草的比例无明显变化,但8月上中旬刈割牧草的叶茎比显著降低（P〈0．01）;在8月上中旬刈割的牧草中,中性洗涤纤维（NDF）和酸性洗涤纤维（ADF）含量有不同程度的增加（P〈0．05）。由试验可知,昭苏马场的合理割草时间以7月上中旬为宜,此时牧草的产量和质量较佳。 相似文献
8.
收获期和调制方法对草木樨干草产量和质量的影响 总被引：6，自引：2，他引：4
研究刈割时期和调制方法对二年生草木樨干草产量和质量的影响。结果表明,初期头茬刈割可获得较高的鲜干草产量及最高及最高粗蛋白南总产量。现蕾至初花期刈割,干划的营养成分含量最高。在直接晾晒、喷碳酸钾（２．５％）晾１压扁茎杆景和压扁茎杆后喷碳酸钾（２．５％）四种调制方法中,后三种方法都能加速干燥,减少营养物质损失,其中以喷碳酸钾（２．５％）的晾晒方法快速简便,值得推荐。 相似文献
9.
以农科1号木地肤为材料,通过研究不同时间（7月28日、8月19日、9月16日）刈割对其产量、品质的影响,以确定其最佳刈割时间。试验结果表明：返青后,农科1号木地肤生长缓慢,进入分枝期（5月下旬）后生长加快,到开花期（8月中旬至9月初）生长几乎停止;8月19日刈割,干物质产量可达15 045.5 kg/hm2,高于7月28日及9月16日;8月19日刈割,粗蛋白含量与7月28日差异不显著（P>0.05）,但显著（P<0.05）高于9月16日,同时随着刈割时间的延后,茎叶比、粗纤维、ADF、NDF的含量逐渐升高;各部位中蕾的粗蛋白含量最高,可达24.07%,品质最好,其次是叶,最后是茎;8月中旬农科1号木地肤的茎叶比为0.56,与7月下旬相比差异不显著（P>0.05）,显著（P<0.05）低于9月中旬的茎叶比。由该试验结果可以得出,在8月中旬至9月初开花期对农科1号木地肤进行刈割可收获较多的叶、蕾和较高的干物质产量,且品质较好。 相似文献
10.
《中国草地学报》2017,(6)
为探讨紫花苜蓿产量和品质变化与气象因子的关系,在相同管理条件下对紫花苜蓿不同刈割时期各茬次的干草产量和营养成分进行测定,计算非纤维性碳水化合物(NFC)、总可消化养分(TDN)、相对饲喂价值(RFV)、奶吨指数和奶亩指数等综合指标,并结合气象因子指标分析了紫花苜蓿产量和品质与气象因子的关系。结果表明:不同刈割时期总干草产量表现为:盛花期现蕾期初花期,各刈割时期干草产量均随着刈割茬次的增加而下降;紫花苜蓿的品质整体表现为初花期和现蕾期显著优于盛花期,各刈割时期均以第一茬品质最佳;随着紫花苜蓿茬次间生长天数的增加,其干草产量和奶亩指数增加;随着刈割时期内温湿度的增加,苜蓿品质劣化,表现为NDF含量增加而粗蛋白质、NFC、TDN含量以及RFV、奶吨指数和奶亩指数下降,茬次间最高气温30℃高温天数的增加是品质劣化的重要因素。 相似文献
11.
12.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
13.
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
16.
17.
18.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
19.
20.
以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献