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《养猪》2020,(4)
为探讨定远猪新品系生长肥育期生长性能和采食行为,利用菩提果9ZC型种猪性能智能测定系统对25～90 kg阶段的定远猪新品系各30头进行了测定。结果表明,公猪自24.62 kg至93.06 kg阶段的日增重、料重比、日采食量、日采食时间、采食速度和日采食次数分别为547.5 g、3.36、1.840 kg、77.00 min、23.90 g/min、6.25次,母猪自23.58 kg至90.32 kg阶段分别为533.9 g、3.46、1.847 kg、82.04 min、22.51 g/min、6.48次,公猪的日增重、采食速度略高于母猪(P0.05),料重比、日采食量、日采食时间、采食次数略低于母猪(P0.05);日增重、料重比、日采食量、采食速度、日采食次数随着体重增长而增加,而日采食时间随着体重增长而降低;采食行为多发生在白昼,公、母猪平均白昼采食量分别占日采食量的74.73%和73.80%,平均白昼采食时间分别占日采食时间的73.17%和72.44%,夜间采食行为约占全天采食时间的1/4,因此养殖过程中要注重夜间补食,以满足猪群的生长需求。 相似文献
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《养猪》2019,(2)
为探讨圩猪生长肥育期生长性能和采食行为,利用菩提果9ZC型种猪智能饲喂计料系统对30～90 kg圩猪阉公猪和阉母猪各10头进行了测定。结果表明,圩猪阉公猪自27.44 kg至94.58 kg阶段的日增重、料重比、日采食量、日采食时间、采食速度、日采食次数分别为366.9 g、4.24、1.556 kg、76.90 min、21.01 g/min、5.77次,阉母猪自21.19 kg至91.10 kg阶段分别为349.3 g、4.36、1.522 kg、79.18 min、19.88 g/min、5.93次,阉公猪的日增重、日采食量、采食速度略高于阉母猪(P0.05),料重比、日采食时间、采食次数略低于阉母猪(P0.05);日增重、料重比、日采食量、采食速度、日采食次数随着体重增长而增加,而日采食时间随着体重增长而降低;圩猪的采食行为多发生在白昼,阉公猪、阉母猪平均白昼采食量分别占日采食量的73.52%和73.26%,平均白昼采食时间分别占日采食时间的73.81%和74.79%,阉公猪、阉母猪间均差异不显著(P0.05)。 相似文献
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本文对大白生长母猪的采食行为进行了观测和研究,总结了其采食规律,以期为养猪生产和猪的行为学研究提供参考数据。选用体重(28.0±1.2)kg的大白母猪60头,采用美国Osborne公司FIRE生产性能测定系统,对猪采食行为进行精确的测定,结果表明,30～60 kg体重大白生长母猪,其平均日采食次数为9.5次;平均日采食量为1 48 kg;平均日增重为0.68 kg;白天的采食量占全天的68.9%;全天采食量的高峰时间段为15:00—18:00。 相似文献
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通过分析杜洛克公猪在不同体重区间的日采食量、日增重、料重比（F/G）等性状的相关关系,评估在较高始测重的情况下测定杜洛克公猪生长及料重比性能的有效性,探究杜洛克公猪不同体重阶段料重比与全程（30~110 kg）料重比的相关性,并建立不同体重阶段料重比与全程料重比的回归方程,以期增加测定站的年测定量,提高其利用率。使用8台奥饲本种猪生长性能测定系统,测定119头杜洛克公猪在30~110 kg体重阶段平均日增重（ADG）、平均日采食量（ADFI）及料重比,分析不同体重阶段料重比与全程料重比的相关性,并与全程料重比建立回归方程。结果表明,杜洛克公猪的日采食量、日增重及料重比在30~110 kg期间均呈增加趋势,并在90 kg出现1个生长期拐点,之后其采食量、日增重及料重比都有下降趋势。不同体重阶段的料重比与全程料重比具有一定的相关性,其中40~90 kg阶段的回归方程Y=0.316+0.873X1的决定系数为0.76,该回归方程校正准确率高,说明可通过40~90 kg料重比来衡量全程料重比,这样既能缩短料重比测定时间,为准确估算全程料重比提供参考依据,同时能够有效提高种猪测定站的利用率。 相似文献
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本试验旨在研究杜洛克种公猪初生重对其育肥期生长性状和采食性状的影响。选取230头杜洛克仔猪,按初生重分为高初生重组和低初生重组,在同一饲养标准下饲养至(100±5)kg体重,记录生长性状和采食性状表型数据,用于后续分析。结果表明:高初生重组的30～100 kg日增重、达到100 kg体重时眼肌面积、瘦肉率、体长、体高和管围等生长性状均显著高于低初生重组(P<0.05);而低初生重组的体重达100 kg所用时间显著长于高初生重组(P<0.01);而高初生重组的100 kg体重背膘厚和100 kg体重肌内脂肪含量与低初生重组无显著差异(P>0.05);高、低初生重组的平均日采食量、日采食时间、日采食次数、平均每次采食时间、平均每次采食量和平均采食速率等采食性状无显著差异(P>0.05);低初生重组在30～100 kg的耗料增重比极显著高于高初生重组(P<0.01)。高初生重的杜洛克仔猪相较于低初生重仔猪在育肥期表现出更快的生长速度和更低的耗料增重比,且体尺特征更加优秀。 相似文献
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《养猪》2016,(6)
为研究新丹系长白猪与大白猪在肥育阶段的采食习性和生长性能,以及料重比和生长速度的关系,试验选用体重(39.5±2.65)kg的长白猪90头和体重为(39.7±2.61)kg的大白猪135头,采用润农全自动种猪生产性能测定系统采集猪只体重为40~100 kg阶段的采食性状。结果表明,新丹系种猪采食习性的高峰期分布在6:00~9:00和15:00~18:00两个时间段,长白猪的采食时长显著高于大白猪(P0.05);在生长肥育阶段,随着猪只体重的增加,采食量显著提高(P0.05),采食时长显著降低(P0.05),料重比显著升高(P0.05);测定期间长白猪和大白猪料重比与日增重呈极显著负相关(P0.01),长白猪料重比与3点平均背膘厚度呈显著正相关(P0.05)。 相似文献
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《养猪》2016,(5)
为研究大河乌猪采食特性与生长性能的相关性,选择云南富源县大河种猪场饲养的日龄相近、体重30 kg左右的50头大河乌猪为试验对象,随机分为5组,每组10头,每头均打上电子识别耳标,进入测定舍测定,试验猪100 kg体重结束试验。试验期间饲喂相同饲粮,自由采食和饮水。结果显示:1)30~50 kg与50~100 kg体重阶段日采食量差异不显著,总耗料量、日增重及料重比均差异显著(P0.05)。2)双变量分析表明,30~50 kg体重阶段大河乌猪的日采食量与日增重、料重比呈强度相关(r=0.960;r=0.932);总耗料量与日增重、料重比呈强度相关(r=0.988;r=0.861);日增重与料重比呈强度相关(r=0.845)。50~100 kg体重阶段大河乌猪的日采食量与日增重、料重比呈强度相关(r=0.981;r=0.990);总耗料量与日增重、料重比呈强度相关(r=0.978;r=0.984);日增重与料重比呈强度相关(r=0.969)。3)30~50 kg和50~100 kg体重阶段日采食量、总耗料量、日增重与料重比之间均呈极显著正相关(P0.01)。 相似文献
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为研究台湾杜洛克猪在育肥阶段采食行为与生长性能的关系,选取体重(41.3±9.1)kg健康的生长猪134头,采用奥斯本全自动种猪生产性能测定系统采集猪采食数据和体重数据,通过统计猪群采食行为24 h的变化规律,对猪群采食行为和生产性能进行相关性分析。结果表明:猪群在1 d中存在2个采食高峰,分别是07:00—10:00和16:00—20:00;猪日增重与日均采食量显著正相关,与日均采食次数、日均采食时长无显著相关;料重比与日增重存在极显著的正相关,与日均采食量、日均采食次数和日均采食时长都无显著相关。 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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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
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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