共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
酵母培养物对产蛋鸡生产性能和蛋品质的影响 总被引:6,自引:0,他引:6
本试验旨在研究酵母培养物(YC)对产蛋鸡生产性能和鸡蛋品质的影响.选用1656只150日龄的海兰褐产蛋鸡随机分为4个处理,每个处理6个重复,每个重复69只鸡,在玉米-豆粕-杂粕型饲粮基础上分别添加0、0.1%、0.2%和0.3% YC,研究其对产蛋鸡产蛋率、平均蛋重、平均日采食量、死淘率和料蛋比及鸡蛋哈夫单位、蛋壳强度、蛋壳重量、蛋壳厚度和蛋黄颜色的影响,试验期20周.试验结果表明:与对照组相比,饲粮中添加0.1%、0.2%和0.3%的YC可降低第1~20周产蛋鸡料蛋比2.15%、3.36%和2.10%(P<0.10,P<0.10,P<0.10);提高第1~20周产蛋鸡产蛋率1.25、0.94和1.36个百分点(P>0.10,P>0.10,P<0.10);延长产蛋鸡90%以上的产蛋率2.2、2.3和2.8周(P>0.10,P>0.10,P<0.10);降低产蛋鸡死淘率2.17、0.73和1.45个百分点(P>0.10,P>0.10,P>0.10).饲粮中添加YC有助于维持气温急剧升高时稳定、较高的产蛋率.饲粮添加YC显著改善了第20周的产蛋鸡蛋黄颜色(P<0.10),对其他蛋品质指标和产蛋鸡的体重增加没有显著影响(P>0.10).产蛋鸡饲粮中添加YC能够改善料蛋比、提高产蛋率和平均蛋重、延长产蛋高峰期、降低死淘率;虽然3个处理之间对生产性能指标的影响差异不明显,但0.2% YC组,在改善平均蛋重、料蛋比、平均日采食量方面表现优异. 相似文献
5.
本试验旨在研究饲粮添加不同水平吡啶甲酸铬对北京红商品产蛋鸡产蛋性能、血液生理生化指标、器官发育和主要脏器组织病理学变化的影响,进而评价吡啶甲酸铬对产蛋鸡的生物安全性。试验采用单因子完全随机设计,选用360只23周龄北京红商品产蛋鸡,按产蛋率和体重一致的原则随机分为4个组,每个组6个重复,每个重复15只鸡。各组分别在玉米-豆粕型基础饲粮中添加0、0.6、4.0和6.0 mg/kg(以铬计)的吡啶甲酸铬。预试期21 d,正试期70 d。结果表明:1)饲粮铬添加水平对试验全期产蛋鸡产蛋性能和器官指数无显著影响(P0.05)。2)饲粮铬添加水平除显著提高试验第35天产蛋鸡血浆谷草转氨酶活性(P0.05)外,对其他血浆生化指标和血液常规生理指标均无显著影响(P0.05)。3)饲粮铬添加水平对产蛋鸡主要内脏器官的发育均无明显影响,同时均未观测到产蛋鸡的心脏、肝脏、肾脏、卵巢和输卵管组织出现明显的病理学变化。以上结果表明,产蛋鸡玉米-豆粕型饲粮中吡啶甲酸铬的推荐添加水平为0.6 mg/kg时,具有10倍的安全系数,即饲粮中以吡啶甲酸铬形式添加6.0 mg/kg铬对产蛋鸡是安全的。 相似文献
6.
7.
8.
为研究中草药添加剂对产蛋鸡生产性能、蛋品质和血清生化指标的影响.选取40周龄海兰褐蛋鸡360只,随机分为4组,每组6个重复,每个重复15只.4个处理组分别在基础饲粮中添加0、0.1%、0.2%、0.4%中草药添加剂.结果表明:试验第42天,0.4%中草药添加组鸡体重显著大于0.1%添加组和未添加组(P<0.05),料蛋比显著低于其他各组(p<0.05),蛋壳强度显著大于0.2%添加组和未添加组(P<0.05),蛋黄比例显著大于0.4%添加组和未添加组(P<0.05),血清总蛋白含量显著低于0.2%添加组和未添加组(P<0.05).0.1%中草药添加组产蛋率显著大于0.4%添加组和未添加组(P<0.05);中草药添加组平均日采食量显著大于未添加组(P<0.05).综合各项指标,中草药可提高产蛋鸡生产性能,改善蛋品质及血清生理生化指标,饲粮中的适宜添加量为0.1%. 相似文献
9.
本试验旨在研究饲粮中添加大豆磷脂(SL)对产蛋鸡生产性能和鸡蛋磷脂含量的影响.选用360只22周龄健康产蛋鸡,随机分为5个处理,每个处理6个重复,每个重复12只鸡.5种试验饲粮中分别添加0、0.5%、1.0%、2.0%和4.0%的SL.试验期4周.试验结果表明:1)0.5%SL组平均蛋重最大(P>0.05),1.0%SL组平均日采食量最低(P>0.05),1.0%和2.0%SL组的料蛋比较低(P>0.05),均显著低于对照组(P<0.05),产蛋率以0.5%组最高(P>0.05),即饲粮中添加0.5%~2.0%的SL可改善产蛋鸡的生产性能;2)饲粮添加SL可以降低鸡蛋蛋黄水分含量(约1.7个百分点)(P>0.05)、1.0%、2.0%和4.0%SL组的蛋黄粗脂肪含量显著高于对照组(P<0.05);1.0%、2.0%和4.0%SL组全蛋中总磷脂显著高于对照组(P<0.05),1.0%和2.0%SL组蛋黄中总磷脂含量显著高于对照组(P<0.05),同时蛋黄胆固醇含量略有增加(P>0.05);1.0%、2.0%和4.0%SL组蛋黄和全蛋中磷脂酰胆碱(PC)含量显著高于对照组(P<0.05);2.0%SL组磷脂酰乙醇胺(PE)最高,但各组间差异不显著(P>0.05);PC/PE随饲粮SL添加量的增加而线性升高,0.5%、1.0%和2.0%SL组均显著高于对照组(P<0.05),4.0%SL组显著高于其他组(P<0.05).结果提示,饲粮添加一定水平的SL可改善产蛋鸡的生产性能,提高鸡蛋中总磷脂和PC含量. 相似文献
10.
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