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药物氯丙嗪对麻羽肉种鸡产蛋性能的影响 总被引:1,自引:0,他引:1
为探讨氯丙嗪对优质肉种鸡繁殖性能的影响,将150只健康的36周龄麻羽肉种鸡D系父母代种母鸡随机分为5组,其中4个试验组饲喂氯丙嗪:试验1组至4组每鸡每天分别饲喂10 mg 、15 mg、20 mg、25 mg,连饲喂2 d停药5 d,再重复一次;对照组不使用氯丙嗪.结果表明:经药物处理的第1周,试验2组产蛋率显著提高,其他各组无明显提高.药物处理的第2周,试验1组产蛋率提高显著.用药2周内试验2组平均产蛋率提高,试验1组种蛋平均合格率下降,其他各组无显著差异. 相似文献
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为了研究微囊丁酸钠对黄羽肉种鸡产蛋性能和繁殖性能的影响,试验选用6 732只42~45周龄的黄羽肉种鸡,按照初始周龄无差异原则随机平均分成2组,每组3个重复,每个重复1 122只黄羽肉种鸡。对照组饲喂基础饲粮,微囊丁酸钠组在基础饲粮中添加微囊丁酸钠500 mg/kg。试验分为两个阶段:预饲期4周,试验期9周,共13周。结果表明:(1)与对照组相比,微囊丁酸钠组黄羽肉种鸡各周平均产蛋率和1~9周平均产蛋率均显著提高(P<0.05),且1~9周平均产蛋率较对照组提高6.63%;(2)与对照组相比,微囊丁酸钠组种蛋活胚率和孵化率显著提高(P<0.05),活胚出苗数提高2.25只。综上所述,饲粮中添加微囊丁酸钠500 mg/kg能够提高黄羽肉种鸡的产蛋性能和繁殖性能,增加经济效益。 相似文献
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为探讨大豆磷脂粉对蛋种鸡孵化性能的影响,试验选用健康、体重均匀一致65周龄罗曼粉父母代蛋鸡992只,随机分为A、B、C、D4个处理,其中A组为对照组,B、C、D处理为试验组,每处理设4个重复。对照组A蛋种鸡饲喂不含大豆磷脂粉的常规基础日粮,试验B、C、D组蛋种鸡分别饲喂大豆磷脂粉含量1%、2%、3%的试验日粮。6周饲养试验结果表明:(1)大豆磷脂粉在蛋种鸡日粮中添加,可以提高蛋种鸡种蛋合格率(P>0.05);提高种蛋受精率、入孵蛋孵化率,试验B、C组与对照组A比差异不显著(P>0.05),试验D组与对照组A比差异显著(P<0.05),试验B、C、D组间差异不显著(P>0.05)。蛋种鸡入孵蛋孵化率随日粮中大豆磷脂粉含量的增加有提高的趋势。(2)蛋种鸡日粮中添加大豆磷脂粉,可以提高健雏率、蛋种鸡提供母雏数量,若1只母雏、公雏分别按4.5、0.5元计,试验期间试验组B、C、D种母禽繁殖收益与对照组比,分别多收益3312、3955、3454元,经济增效明显。 相似文献
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试验旨在考察大金鸡菊提取物对蛋种鸡产蛋后期生产性能、蛋品质、血清抗氧化功能及繁殖性能的影响。试验选取1 200只50周龄健康蛋种鸡,随机分成4组,每组6个重复,每个重复50只。空白组饲喂基础日粮,试验各组分别在基础日粮中添加300、500、1 000 mg/kg大金鸡菊提取物,预试期7 d,正试期35 d。结果表明:与空白组相比,中、高剂量大金鸡菊提取物,蛋种鸡产蛋后期产蛋率均显著提高(P<0.05),料蛋比显著降低(P<0.05);与空白组相比,中、高剂量组蛋种鸡产蛋后期蛋壳强度、蛋黄颜色及哈夫单位均有不同程度的提升;与空白组相比,中、高剂量大金鸡菊提取物蛋种鸡产蛋后期的抗氧化性能显著提高(P<0.05)。与空白组相比,中、高剂量组大金鸡菊提取物蛋种鸡产蛋后期的繁殖性能显著提高(P<0.05)。饲料添加适宜水平的大金鸡菊提取物能够改善蛋种鸡产蛋后期生产性能和养分利率,提高蛋黄色泽增强蛋品质,增强抗氧化性能及繁殖性能。 相似文献
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本试验旨在研究多菌种复合微生态制剂对蛋种鸡生产性能的影响。选用384只15周龄的海兰褐蛋种鸡,随机分成4组,每组4个重复,每个重复24只鸡。对照组饲喂基础日粮,试验1、2、3组在基础日粮中分别添加50、100、200 g/t的复合微生态制剂。结果表明,试验3组的平均蛋重显著高于对照组(P<0.05),但开产日龄比对照组晚;在27~30周龄时试验2组显著提高了产蛋率并降低了料蛋比(P<0.05),而试验3组的产蛋率显著降低(P<0.05),料蛋比升高(P>0.05);试验组的繁殖性能指标与对照组差异不显著。因此,饲料中添加复合微生态制剂可以提高蛋种鸡产蛋前期的生产性能,本试验中复合微生态制剂的适宜添加量为100 g/t。 相似文献
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将50周龄的"罗曼褐"父母代蛋种鸡540只,随机分为2组(试验组和对照组),每组270只鸡,设6个重复,每个重复45只鸡。试验组与对照组日粮及饲养管理相同。预试期间试验组与对照组饲喂基础日粮,组间产蛋性能指标差异不显著(P>0.05)。试验期,试验组基础日粮中添加有益微生物惠康Ⅰ号,对照组不添加,试验周期为42d。试验期间测定各组别每重复蛋种鸡的产蛋性能和繁殖性能指标。结果表明,添加有益微生物惠康Ⅰ号的试验组只鸡日产蛋量、产蛋率、破蛋率、种蛋受精率、孵化率、每只入舍母鸡提供健雏数等生产性能指标均比对照组提高,采食量、平均蛋重、料蛋比、种蛋合格率、健雏率比对照组低,但组间各项生产性能指标差异不显著(P>0.05)。 相似文献
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不同能量蛋白水平对蛋种鸡生产性能的影响 总被引:1,自引:0,他引:1
不同能量蛋白水平对28~39周龄京红一号蛋种鸡生产性能的影响,为京红一号蛋种鸡营养标准的制定提供理论参考数据.选用1 152只28周龄京红一号蛋种鸡,根据体质量完全随机分成6个处理组,每处理组4个重复.双因素随机试验设计2个能量水平(11.13和11.55 MJ/kg),3个蛋白水平(15.5%、16.5%和17.5%).饲养期从28周龄到39周龄.结果表明:处理Ⅱ组(能量11.13 MJ/kg,蛋白16.5%)产蛋率最高,分别较其他处理组提高了2.63%、0.85%、4.14%、1.44%和0.56%;处理Ⅱ组平均蛋质量最高,显著高于处理Ⅰ和Ⅳ组,其他各组间差异不显著;处理Ⅱ组料蛋比、日增质量和日产蛋量等指标均显著高于处理Ⅳ组,其他各组间差异不显著;各组间死淘率和种蛋合格率均无显著差异;处理Ⅵ组饲料成本最高,综合各项指标,处理Ⅱ组经济效益最好,比其他各组分别多盈利65.23、46.52、44.56、4.53和65.28元.说明在产蛋高峰期28~39周龄,生产最适添加量为能量11.13 MJ/kg,蛋白16.5%. 相似文献
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本试验通过在种鸡的基础饲粮中加入肌苷酸(IMP)来研究其对种鸡产蛋性能、蛋品质和种蛋孵化性能的影响。选择遗传背景相同、体重相近,产蛋率达到5%的20周龄健康AA种鸡864羽,随机分为2组(对照组饲喂基础饲粮;试验组饲喂基础饲粮+0.5%肌苷酸),每组6个重复,每个重复72羽,试验期30 d。测定试验期间所有种蛋的平均蛋重、产蛋率和合格蛋率;每组随机选取部分种蛋进行蛋品质测定;于孵化开始第17天,通过照蛋处理统计种蛋受精率,第21天出雏时,计算受精蛋孵化率、入孵蛋孵化率和健雏率。试验结果表明:与对照组相比,试验组种鸡的平均蛋重、产蛋率和合格蛋率均有升高的趋势,但差异不显著(P>0.05);蛋形指数显著升高(P<0.05),蛋壳强度、蛋壳厚度和蛋黄颜色显著降低(P<0.05);受精率、受精蛋孵化率和入孵蛋孵化率显著升高(P<0.05),健雏率和雏鸡体重有升高的趋势,但差异不显著(P>0.05)。综上,0.5%外源肌苷酸对种鸡的产蛋性能和种蛋孵化性能均有促进作用。 相似文献
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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
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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
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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
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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
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献