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1.
淮南猪是河南省优良地方品种。通过对淮南猪原种场母猪繁殖性能五年(1998~2002)统计资料与当地主要气候生态因子的相关性分析。发现高温、高湿气候因子对淮南母猪繁殖性能影响最大,极端最低气温、最高气温对母猪繁殖性能有不良影响。  相似文献   

2.
为了解不同胎次、季节对淮南猪繁殖性能的影响,对878头淮南猪2 131窝的繁殖记录进行统计分析。结果表明:随着母猪胎次的增加,淮南猪的产仔性能呈现先升高再稳定最后降低的趋势。在第4胎时,其总产仔数显著高于第1胎(P0.05),活仔数和健仔数显著高于第1胎与第7胎及7胎以上的母猪(P0.05)。在第5胎时,淮南猪的死胎数最多,显著高于1~3胎(P0.05)。在第6胎时淮南猪的木乃伊胎数最多,显著高于3、4、5、7胎及7胎以上(P0.05)。在配种季节方面,秋季配种时,其总产仔数、活仔数和健仔数最多,显著高于春季(P0.05)。在分娩季节方面,冬季分娩时,其总产仔数、活仔数和健仔数最多,显著高于秋季(P0.05)。研究表明,淮南猪在第2~6胎时繁殖性能较优,并且在秋季适宜配种,冬季适宜分娩。  相似文献   

3.
陈辉 《猪业科学》2019,36(9):62-64
近年来,随着我国种母猪繁殖性能的不断改良,使得我国养猪生产水平得到了不断地提升,因此,笔者回顾了近年来母猪繁殖性能的改良进展,对当前我国市场主流母猪品种(大白猪、杜洛克猪、长白猪以及巴克夏猪)的改良进行了分析,并简要对我国地方母猪品种的繁殖性能分析也进行了回顾,旨在为今后我国母猪繁殖性能的改良提供启示和策略,从而更好地发挥母猪的生产效率。  相似文献   

4.
苏太猪不同胎次繁殖性能的比较分析   总被引:3,自引:0,他引:3  
本试验对苏太母猪核心群不同胎次的繁殖性能进行比较,并对后备猪的初生重、35日龄断奶重、4月龄重和6月龄重等早期生产性能与后期繁殖性能之间的关系进行分析,旨在进一步了解苏太猪的繁殖性能,为苏太后备母猪的选种提供指导。结果表明,第1胎产仔数最少,成活率最低,第4胎成活率最高,至第3胎达较高水平并一直稳定保持至第6胎,第3胎的繁殖性能可以作为淘汰母猪的重要依据。后备猪35日龄断奶重与4月龄重、6月龄重都呈极显著正相关,4月龄重和6月龄重间也具有极显著正相关关系,苏太后备母猪早期生产性能与后期繁殖性能没有显著相关,选择35日龄断奶重小的母猪留种更加经济。  相似文献   

5.
杨雪梅  梁艳  陶璇  刘锐  吕学斌 《养猪》2012,(3):63-64
试验初步探明了丫杈猪的发情规律,其发情周期为20.56 d、持续期为4 d,妊娠期为114.88 d。对丫杈猪的繁殖性能进行研究分析,结果表明,丫杈猪初产母猪繁殖性能明显低于经产母猪,其中产活仔数低1.42头,初生窝重低1.2 kg,21日龄个体重低0.1 kg,35日龄个体重低0.9kg。杂交试验表明,丫杈猪与其他品种猪杂交后,繁殖性能有所提高。  相似文献   

6.
L-肉碱是一种具有生理活性、安全无毒的营养性添加剂,对改善猪的繁殖性能发挥着重要的作用。文章综述了L-肉碱的特性、生理功能以及对公猪、母猪的繁殖性能和仔猪生长的影响,旨在为L-肉碱在猪生产上用于提高繁殖性能提供科学依据。  相似文献   

7.
为分析长白×陆川母猪杂交模式下胎次及分娩季节对陆川母猪繁殖性能的影响,以华南地区某猪场834窝长白×陆川母猪繁殖模式的产仔性能数据进行分析。结果表明:陆川母猪第1胎产仔数最低,2~6胎龄繁殖性能稳定,第8胎龄繁殖性能达到高峰,从第9胎龄繁殖性能开始有下降趋势,畸形数、死胎数和木乃伊数明显增加。陆川母猪的总产仔数、产活仔数在不同季节间差异不显著,但夏季处于较高水平,其次是秋季、冬季和春季,可能与陆川猪在华南区域特殊的适应性有关。  相似文献   

8.
山东省农科院畜牧所良种猪技术研究中心1998年10月从法国引进大约克原种猪,经过三年多的饲养、观察和选育,发现该品种猪具有适应性强,体质较粗壮,蹄质坚实,产仔数多,泌乳力强,胴体瘦肉率高等特点。现将法系大约克猪的生产性能测定结果报告如下。1材料与方法1.1测定猪的选择选择2000年春季产仔的法系大约克猪37窝,2000年秋季产仔的34窝和2001年春季产仔的42窝,统计母猪的繁殖性能;选择血统一致、体重相近、发育良好的健康生长猪进行生长肥育性能和胴体性状的测定。1.2测定性状母猪的繁殖性状、生长猪肥育性能和胴体性状。1.2.1母猪繁殖性状。…  相似文献   

9.
1影响母猪产仔性能的因素分析 1.1猪品种及繁殖障碍不同品种猪的产仔性能的差异较大。我国地方猪种产仔数的差异相当大,外来猪品种的产仔数也有一定差异,其中以大自猪繁殖性能为优,平均产仔数11.08头,产活仔数10.26头,长白猪次之,而杜洛克的繁殖性能相对较差,汉普夏的繁殖性能最差。品种是影响母猪繁殖性能的一个重要的遗传因素。  相似文献   

10.
采取随机的方式选取试验猪,在常规饲养条件下,分别对大约克夏公猪的性行为、母猪的性行为和母猪的繁殖性能进行了观察。结果表明,大约克夏猪公猪在采精量、精子密度和精子活力等方面表现良好,母猪具有发情较明显、产仔数相对较多、泌乳性能良好等优点,是一个种质优秀的猪种。  相似文献   

11.
12.
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   

13.
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.
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   

15.
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   

16.
用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10~0.82μg/g。表明:蜂蜜应视为天然富硒营养品。  相似文献   

17.
为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …  相似文献   

18.
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   

19.
Fractures of the anconeal process of 5 pigs ranging in age from 4 to 8 months were studied radiographically and histologically. Clinically, animals with a fracture of the anconeal process had a "tight," restricted gait. In pigs at 4.5 months of age, a radiolucent line through the base of the anconeal process was composed of fibrocartilage, fibrous connective tissue, and hyaline cartilage. Subperiosteal proliferation of woven bone was located along the cranial surface of the olecranon, adjacent to the base of the anconeal process. In older animals, the radiolucent line through the anconeal process contained variable amounts of fibrous connective tissue and fibrocartilage. The proliferation of subperiosteal bone at the base of the anconeal process formed a "buttress callus" which retained a radiolucent area between the callus and the proximal surface of the anconeal process. The latter region of radiolucency was continuous with the transversely oriented line that traversed the base of the anconeal process.  相似文献   

20.
乳酸杆菌益生作用机制的研究进展   总被引:2,自引:0,他引:2  
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   

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