共查询到20条相似文献，搜索用时 62 毫秒
1.
宁海土鸡适宜日粮能量和粗蛋白质水平的研究 总被引：1，自引：0，他引：1
本实验旨在研究浙江省地方优质品种宁海土鸡各阶段适宜的能量(ME)和粗蛋白质(CP)水平。选用1日龄宁海土鸡健雏900羽(公母各半),随机分为9个处理,每个处理2个重复,每个重复50羽,分三个阶段饲养(0～4周、5～8周、9周以上),公母鸡分别于第14、17周龄结束试验,测定不同性别、不同阶段的日粮、不同日粮营养水平对宁海土鸡日增重、饲料转化率等生长性能的影响。试验结果显示宁海土鸡各阶段最佳能量、蛋白质及蛋能比为:第一阶段(0～4周)分别为11.90MJ/kg、20.03%、16.83g/MJ;第二阶段(58周)分别为12.20MJ/kg、18.02%、14.78g/MJ;第三阶段(9周以上)分别为12.30MJ/kg、17.46%、14.20g/MJ。结果提示优质黄羽肉鸡的适宜能量和粗蛋白质水平需求受生长阶段的影响,各地区应根据本地方品种的生理特点设计日粮,并推荐浙江地区参考宁海土鸡日粮能量和粗蛋白质水平。 相似文献
2.
《黑龙江畜牧兽医》2016,(21)
为了分析京海黄鸡三系配套系商品代的生产性能,试验选择1日龄京海黄鸡FBJ配套系商品代公母雏鸡各200只,测定了0,2,4,6,8,10周龄体重、料重比、成活率,采用Gompertz非线性生长模型进行分析。结果表明:京海黄鸡三系配套系商品代4周前生长缓慢,4周后生长速度逐渐加快,在6~8周龄达到增长高峰期,公母鸡周增重分别达到279.83 g和210.33 g,8周后增速有一定程度的下降;公母鸡在2周龄前生长曲线基本一致,而2周龄后公鸡生长速度明显快于母鸡;Gompertz非线性生长模型能够很好地模拟京海黄鸡三系配套系商品代公母鸡的生长曲线,拟合度均为1.000;公鸡最佳上市日龄为56日龄,体重为1 658.22 g,料重比为2.21,成活率为96.50%,拐点周龄为6.847周龄;母鸡最佳上市日龄为70日龄,体重为1 702.86 g,料重比为2.69,成活率为97.00%,拐点周龄为6.074周龄。 相似文献
3.
淮南麻黄鸡生长曲线拟合及开产性状相关分析 总被引：2，自引：0，他引：2
采用Gompertz、Logistic和von Bertalanffy 3种模型对淮南麻黄鸡1～16周龄生长曲线进行了拟合研究,同时对20周龄体重、开产日龄以及开产蛋重等性状进行了相关分析。结果表明,在3种生长曲线模型中,von Bertalanffy模型在拟合度和预测淮南麻黄鸡1～16周龄体重效果相对较好,公、母鸡的拟合度(R2)分别为0.994和0.996,极限体重分别为2 200 g和1 333 g。淮南麻黄鸡20周龄体重、开产日龄与开产蛋重均呈正相关(P<0.01)。 相似文献
4.
随机选取1日龄五华三黄鸡200只,公母各半,测定0~20周龄的体重、采食量。分别运用Logistic、Gompertz和Bertalanffy模型拟合其生长曲线,并与采食量函数相结合,进一步推算出最佳上市时间。结果表明:3种模型均能很好地拟合五华三黄鸡生长曲线,各种模型的拟合度(R~2)均在0.996以上,其中Gompertz模型拟合效果最佳,公、母鸡拟合度分别为0.998,0.999。Gompertz模型拟合的五华三黄鸡公、母拐点周龄分别是8.418周和8.210周、拐点体重分别是800.229 g和661.916 g;公、母鸡累计采食量与时间的三次回归方程拟合度分别为0.999,0.998,拟合效果良好;结合经济学中边际理论得出公、母鸡最佳上市时间为16.88周(118 d)和15.63周(110 d)。 相似文献
5.
为了检验不同模型对蒙山草鸡生长发育的拟合效果,试验分别采用Logistic、Gompertz和VonBertalanffy3种非线性生长模型对不同性别蒙山草鸡的生长发育进行拟合.结果表明:公、母蒙山草鸡在2周龄前生长曲线基本一致,而2周龄后公鸡明显快于母鸡,3种模型的拟合效果均很好,以Gompertz模型最佳.公、母鸡的生长拐点分别为8.24周和7.46周,公鸡的成年体重显著高于母鸡,但达到拐点的周龄较母鸡迟. 相似文献
6.
7.
莫里·桑卡雷 《广东畜牧兽医科技》2001,26(2):24-26
选用同日出壳公母健雏各222只，在相同饲养管理条件下，对海波罗肉鸡早期生长发育等有关指标进行观测，结果表明，公鸡早期生长速度较母鸡快，平均日增重比母鸡高4．53g，公母鸡7周龄体重分别为2197．06g和1976．47g；累计耗料量公鸡比母鸡多16．33g；公母鸡料肉比分别为2．10和2．33；经7周龄饲养公母鸡成活率均达92％，抗逆性强，是值得推广的优质鸡种。 相似文献
8.
为探究西藏藏鸡早期的生长发育规律,本研究采用Logistic、Bertalanffy和Gompertz非线性模型对公、母鸡从出生到24周龄的体重进行拟合分析。结果显示:3种生长曲线模型的拟合度均能达到0.99以上;进一步从统计和生物学意义角度评价3种模型发现,Gompertz模型拟合效果最好;Gompertz方程拟合公鸡和母鸡的生长拐点周龄分别为10.28周和10.65周;公鸡的拐点体重、最大周增重和最大体重分别为577.20、80.81、1569 g,母鸡分别为465.80、55.90、1266.18 g。研究表明3种模型对西藏藏鸡生长曲线的拟合和分析是可行的,可为管理藏鸡生长发育关键点提供参考。 相似文献
9.
10.
以商品代艾维茵肉鸡为材料,研究了公母鸡1～9周龄体重的变化,运用Logistic、Gompertz和vonBertalanffy生长模型分别对公母仔鸡的生长曲线进行拟合与分析.结果表明:在5周龄前公、母鸡的生长曲线基本一致,5周龄后公鸡生长速度明显快于母鸡;3种模型均能较好地拟合艾维茵仔鸡的生长曲线,拟合度(R2)均高... 相似文献
11.
12.
Beran GW 《Preventive veterinary medicine》2008,86(3-4):198-207
When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures. 相似文献
13.
14.
在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。 相似文献
15.
16.
Dekker A Dercksen D Snoep J van Wuyjckhuise L 《Tijdschrift voor diergeneeskunde》2007,132(18):695-701
On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures. 相似文献
17.
18.
19.
20.