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为了研究皖南花猪部分屠宰性状的发育性变化及性别差异,试验采用0,30,45,90,180日龄的皖南花猪公、母各5头进行屠宰测定。结果表明:皖南花猪的各项屠宰指标都有不同程度的发育性变化,30日龄时,肾脏重有显著增长(P0.05),其他指标都有极显著增长(P0.01);在30~45日龄阶段,胴体斜长、膘厚、皮厚、肺脏重有显著增长(P0.05),但眼肌面积、心脏重、肝脏重、脾脏重、肾脏重增长不显著(P0.05);在45~180日龄阶段,所有指标都呈现快速的增长。出生和180日龄时,屠宰指标的性别差异均不显著(P0.05);30日龄时母猪的膘厚显著大于公猪(P0.05);45日龄时,母猪的胴体斜长和肝脏、脾脏、肾脏重显著小于公猪(P0.05);90日龄时母猪的胴体斜长显著大于公猪(P0.05);皖南花猪的肌内脂肪含量较高,且在背最长肌和半腱肌有不同的发育规律。 相似文献
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《养猪》2021,(3)
为研究杜洛克公猪肌内脂肪含量与重要生长指标的相关性,试验通过B超测定了738头杜洛克公猪活体肌内脂肪以及重要的生长性状,结果表明:肌内脂肪与180日龄体重、背膘厚、眼肌面积均呈极显著正相关(P0.01),相关系数分别为0.334、0.510和0.267;眼肌面积与初生重、180日龄体重、背膘厚呈极显著正相关(P0.01),相关系数分别为0.157、0.624和0.323;背膘厚与180日龄体重呈极显著正相关(P0.01),相关系数为0.498;180日龄体重和初生重呈极显著正相关(P0.01),相关系数为0.200。研究为高肌内脂肪含量的杜洛克公猪选育提供了相关理论及数据支持。 相似文献
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通过对上海某猪场法系大白母猪、阉公猪和公猪各30头的饲养试验,分析3种类别的猪在40~100 kg阶段日采食量、料重比、日增重、活体背膘厚、眼肌面积、眼肌高度的差异。结果显示,料重比,阉公猪分别比母猪和公猪显著高15.05%和11.85%;日增重,阉公猪分别比母猪和公猪显著低10.77%和8.93%;活体背膘厚,公猪分别比母猪和阉公猪高13.28%和3.21%;眼肌面积,阉公猪分别比母猪和公猪高1.76%和4.71%;眼肌高度,阉公猪分别比母猪和公猪高3.25%和6.49%。阉公猪从90~100 kg体重开始采食量明显高于公猪和母猪,提示在生产上应该在阉公猪到达90 kg时尽早上市销售,或者在这一阶段到来时开始限饲以降低成本。 相似文献
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《黑龙江畜牧兽医》2020,(8)
为了研究不同饲喂水平对生长肥育阶段公、母分群饲养的母猪和去势公猪生产性能、胴体性状及肉品质的影响,试验选用90日龄、体重(40.80±0.10)kg、健康的生长肥育猪256头,按照相同性别随机分成母猪自由采食组、母猪限饲组、去势公猪自由采食组和去势公猪限饲组,母猪限饲组喂料量是母猪自由采食组料量的90%,去势公猪限饲组喂料量是去势公猪自由采食组料量的90%。试验于188日龄时结束,分别于90,125,170,188日龄测定各试验组猪只生产性能、眼肌面积及背膘厚度。试验结束时,各组随机选取10头猪只进行屠宰并测定胴体性状及肉品质。结果表明:去势公猪自由采食组的体重、平均日采食量和平均日增重最高;母猪限饲组体重及平均日增重最低;限饲组料重比均比其相应自由采食组低;去势公猪限饲组生产性能与母猪自由采食组接近。去势公猪自由采食组在各阶段背膘厚度均为最高;母猪限饲组背膘厚度在试验各阶段显著低于其他3组(P0.05);去势公猪限饲组在188日龄时眼肌面积显著低于母猪自由采食组和公猪自由采食组(P0.05)。去势公猪自由采集组屠宰率和瘦肉率最低,板油最多,母猪限饲组瘦肉率最高,板油最少。去势公猪自由采食组肉色亮度在屠宰后1 h显著高于去势公猪限饲组(P0.05),接近PSE肉的亮度;母猪限饲组肉色红度最高,去势公猪限饲组大理石纹评分低于母猪和去势公猪自由采食组(P0.05)。说明自由采食的公、母猪增重最好,但料重比及肉质性状差于限饲的公母猪。 相似文献
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新美系大白猪测定选育报告 总被引:1,自引:0,他引:1
新美系大白猪测定选育。2003年组建基础群,经过三个世代的选育测定,其主要经济性状达到和超过保种选育指标。公猪30~100kg日增重达到936g,母猪912g;100kg体重背膘厚,公猪10.6mm,母猪11.5mn2,生长到100kg体重日龄公猪152d,母猪157d,饲料报酬为2.6:1,公猪屠宰率为70.3%,眼肌面积46.57%,瘦肉率66.85%;母猪屠宰率为71.5%,眼肌面积48.6%,瘦肉率67.32%。母猪初产仔猪10.3头,二胎为11.5头,经产为12.6头,猪群氟烷基因阳性率为2.03%。开展杂交利用效果好。且将种猪推广到全国20几个省市的218个种猪场,社会效益和经济效益显著。 相似文献
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双肌臀大约克猪选育与杂交利用的初步研究 总被引:3,自引:2,他引:1
双肌臀大约克第2胎母猪6窝纯繁的窝产仔、35日龄育成仔数和个体重分别为11.5头、10.83头和11.80千克,24头仔猪(12头阉公)20~105千克的育肥全期日增重、每千克增重耗料和日龄为816克、2.81千克和161.2天,6头阉公猪105千克时的胴体背膘厚、眼肌面积和瘦肉率分别为17mm、40.63cm2和65.87%;与长白公猪和长·二母猪杂交的后代各24头的育肥全期日增重、每千克增重耗料及各6头阉公猪的背膘厚、眼肌面积、胴体瘦肉率分别为810克和730克、2.88千克和3.03千克及18.83mm和20.08mm、38.5cm2和35.92cm2、64.63%和59.53%. 相似文献
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皖南花猪按头型可分为狮子头型、马脸型和桩头型,为研究皖南花猪母猪不同头型母猪间的繁殖性能差异,研究通过整理安徽省皖南花猪保种场以往数据,现场记录等方法,统计皖南花猪不同头型经产母猪(370窝)的窝产仔数、窝产活仔数、初生窝重、35日龄窝断奶仔猪数和35日龄断奶窝重等繁殖性能指标,并进行比较分析。结果如下:皖南花猪马脸型母猪窝产仔数、窝产活仔数、仔猪初生窝重、35日龄断奶仔猪数、35日龄断奶窝重均显著高于狮子头型及桩头型母猪(P0.05);皖南花猪桩头型母猪在窝产仔数、窝产活仔数、仔猪初生窝重等繁殖性能上优于狮子头型母猪,但在35日龄断奶窝重这一指标中低于狮子头型母猪。研究表明皖南花猪马脸型母猪繁殖性能与狮子头型、桩头型母猪相比更为优异,为皖南花猪种质资源保护与开发利用提供了一定的参考依据。 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