共查询到20条相似文献，搜索用时 62 毫秒
1.
选取90头"杜长大"三元断奶仔猪,要求体重相近、日龄相同,随机分成5个处理组,每组18头,各组公母各半进行为期28d的饲养试验。5个处理组分别为,对照组饲喂基础日粮、试验1组饲喂基础日粮+1%参苓白术散、试验2组饲喂基础日粮+3%参苓白术散、试验3组饲喂基础日粮+5%参苓白术散、试验4组饲喂基础日粮+抗生素。结果显示,饲料中添加参苓白术散和抗生素组均提高了断奶仔猪的平均日增重,降低了料重比和腹泻率,综合成本效益等因素选择饲料中添加3%参苓白术散为最佳添加量。 相似文献
2.
3.
研究仔猪断奶日龄对猪场经济效益的影响。试验采取随机分组的设计,选取妊娠日龄相近的20头母猪,随机分为2个组:试验Ⅰ组,哺乳仔猪21日龄断奶;试验Ⅱ组,哺乳仔猪28日龄断奶。试验结果表明:每胎试验Ⅱ组相较于试验Ⅰ组,母猪多耗料52.5kg,断奶仔猪体重多0.75kg,教槽料多使用20kg,保育猪成活率提高8%,达到同样的体重,育肥猪提前20天出栏,每头母猪年产胎次减少0.05。试验结果表明:哺乳仔猪28日龄断奶,虽然减少了每头母猪每年提供的断奶仔猪头数,但是可以提高断奶仔猪的成活率,缩短育肥猪出栏时间,其收益远大于投入。 相似文献
4.
为了研究不同中草药添加剂饲喂母猪对哺乳仔猪黄白痢的防治及生长效果的影响,本试验采用单因素随机试验设计,对照组母猪泌乳期饲喂基础饲粮,试验Ⅰ组日粮在基础饲粮中添加2％普通中草药,试验Ⅱ组日粮在基础饲粮中添加2％发酵型纳米中草药.结果表明,添加中草药能有效防治哺乳仔猪的黄白痢,提高仔猪成活率,促进仔猪生长.其中试验Ⅰ组预防仔猪黄白痢效果最佳,腹泻率为0.91％,死亡率为2.54％,明显低于对照组;试验Ⅱ组促进仔猪生长效果最佳,仔猪断奶体重、断奶窝重和平增日增重分别为6.59 kg/头、771.03 kg/窝和191.07g/头,分别比对照组提高了11.32％、18.40％和15.05％,显著高于对照组. 相似文献
5.
试验通过在基础饲粮中添加巴尔麦氏,研究其对母猪繁殖性能以及哺乳仔猪生长性能和防腹泻方面的作用。根据胎次相近原则选择70头妊娠母猪,随机分成两组,每组35头,对照组饲喂常规母猪料,巴尔麦氏组于母猪产前15 d到哺乳期(23 d)结束的基础饲粮中添加巴尔麦氏3 g/kg;巴尔麦氏组母猪所产仔猪对应为巴尔麦氏组仔猪,对照组母猪所产仔猪对应为对照组仔猪,巴尔麦氏组仔猪从添加教槽料开始到断奶结束期间添加巴尔麦氏10 g/kg,对照组不添加。结果表明,在妊娠后期母猪的饲粮中添加0.3%的巴尔麦氏,对母猪总产仔数、产活仔数和产健仔数无显著影响(P0.05),但可显著减少母猪产死胎数(P0.05);哺乳仔猪添加1%的巴尔麦氏,仔猪初生重、断奶重和日增重分别比对照组高50 g(P0.05)、0.74 kg(P0.01)和28.67 g(P0.05),但日采食量差异不显著(P0.05),腹泻率低于对照组9.09个百分点,每头断奶仔猪收益提高6.49元。因此,在妊娠后期至哺乳期母猪和哺乳仔猪饲粮中添加巴尔麦氏,可减少母猪的死胎数量、降低仔猪腹泻率、提高仔猪日增重和经济效益。 相似文献
6.
《饲料研究》2017,(18)
试验旨在研究益生菌对断奶仔猪生长性能、腹泻率、粪便微生物菌群及免疫功能的影响。选取240头体质量相近且健康的28日龄杜长大断奶仔猪,随机分为4组,每组6个重复,每重复10头猪,试验期28 d。对照组饲喂玉米-豆粕型基础日粮,试验Ⅰ组在基础日粮中添加100 mg/kg杆菌肽锌(抗生素),试验Ⅱ组在基础日粮中添加250 mg/kg复合益生菌(三效菌),试验Ⅲ组在基础日粮中添加500 mg/kg复合益生菌(三效菌)。试验结果表明:与对照组相比,添加不同剂量的益生菌能显著提高断奶仔猪的平均日增质量、降低料重比(P0.05);抗生素组和益生菌组腹泻率均显著低于对照组(P0.05);添加复合益生菌可显著降低粪便大肠杆菌数量,提高双歧杆菌和乳酸杆菌数量(P0.05);各组之间血清中免疫球蛋白含量无显著差异(P0.05)。由此可知,益生菌能够降低断奶仔猪的腹泻率,提高生长性能,改善肠道菌群。 相似文献
7.
文章旨在研究妊娠母猪日粮中添加功能性纤维对其繁殖性能和肠道微生物的影响,试验将200头经产妊娠母猪随机分为4组,每组5个重复,每个重复10头猪,对照组饲喂基础日粮,试验Ⅰ组、试验Ⅱ组、试验Ⅲ组分别在基础日粮中添加0.5%、1.0%、1.5%功能性纤维,试验结果显示,3个试验组母猪妊娠90 d、分娩前背膘厚均极显著低于对照组（P <0.01）;各组产活仔数、窝均断奶头数、仔猪初生窝重、断奶窝重、断奶均重显著高于对照组（P <0.05）,试验Ⅱ组产健仔数极显著高于其余组别（P <0.01）;各组妊娠晚期（110 d）粪便中各菌门相对丰度显著高于对照组（P <0.05）。试验结果表明,日粮添加功能性纤维可降低妊娠晚期母猪背膘厚,调节肠道微生物菌群,提高繁殖性能,但功能性纤维适宜添加比例仍有待进一步研究。 相似文献
8.
9.
研究旨在探讨复合抗氧化剂对早期断奶仔猪肠道主要菌群的影响.选择12窝21日龄(杜×长)二元杂交仔猪,随机分成3组,每组4窝猪,分别为对照组、断奶组和抗氧化剂组.对照组和断奶组饲喂基础日粮,抗氧化剂组在基础日粮中添加6.75 g/kg复合抗氧化剂.断奶组和抗氧化剂组分别于21日龄断奶,对照组继续哺乳.在仔猪24日龄时,每窝随机取1头进行屠宰,无菌采集仔猪盲肠内容物,以SYBR Green Ⅰ实时荧光定量PCR技术测定盲肠内容物中乳酸杆菌和大肠杆菌数量的变化.结果表明:1)与对照组相比,断奶组乳酸杆菌数量降低了49.3％,大肠杆菌数量增加了66.2％；抗氧化剂组乳酸杆菌数量有下降的趋势,但差异不显著,大肠杆菌数量显著降低了57.9％.2)与断奶组相比,抗氧化剂组乳酸杆菌显著升高,大肠杆菌数量显著降低.仔猪早期断奶应激可导致肠道菌群紊乱,在日粮中添加复合抗氧化剂能够促进肠道有益菌并抑制有害菌的增殖,提高仔猪肠道健康. 相似文献
10.
植物乳杆菌对断奶仔猪生产性能和生化指标的影响 总被引：1，自引：0，他引：1
探讨猪源植物乳杆菌制剂对断奶仔猪生产性能、肠道菌群及血清生化指标的影响。选择体质量约(7.7±0.27)kg的72头(长×大)二元杂交断奶仔猪,随机分成3组,对照组饲喂基础日粮,试验Ⅰ组和Ⅱ组分别在基础日粮中添加0.25%和0.5%的植物乳杆菌冻干粉,试验期30 d。结果表明:1)试验Ⅰ组和Ⅱ组断奶仔猪平均日增质量分别比对照组提高了4.66%和8.01%,料重比分别比对照组降低了5.52%和7.73%;2)植物乳杆菌制剂可降低断奶仔猪粪中大肠杆菌数量,并能增加乳酸菌的数量;3)试验Ⅰ组和Ⅱ组仔猪血清尿素氮分别比对照组降低了13.97%和14.77%,谷草转氨酶降低了29.37%和30.98%。 相似文献
11.
12.
13.
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
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.
16.
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
17.
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
18.
19.
20.
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