生沛素对皖系粗毛兔生产性能的影响     

陈胜  赵辉玲  李立冰  朱秀柏 《中国养兔杂志》2003,(2):23-26

选择42日龄皖系粗毛兔幼兔42只,根据体重、性别,随机分成3组,分别饲喂含1‰、2‰生沛素日粮和对照组日粮.结果表明,添加1‰、2‰生沛素组产毛量比对照组分别提高17.5%(P＜0.01)和19.1%(P＜0.01);增重提高11.2%(P＜0.05)和12.5%(P＜0.05);每只兔一次产毛的经济效益比对照组分别提高2.96元和1.13元.另外,添加生沛素的试验组兔毛品质也比对照组有所提高和改善.  相似文献   

基于CAN-LIN总线的汽车车身网络的设计     

袁文燕  迟瑞娟 《拖拉机与农用运输车》2006,33(6):20-21,23

LIN(Local InterconnectNetwork)协议是面向车辆低端分布式应用的一类串行通信协议。LIN设计目标作为CAN(ControllerArea Network)的下层网络,同CAN相结合可构成车辆应用中的分层网络结构。本文对LIN总线进行了介绍,设计了CAN-LIN总线网络拓扑结构图,并对CAN-LIN节点的软硬件进行了设计调试,最后连接车身电器试验台进行了测试。  相似文献   

不同气候条件对早期断奶犊牛生长发育的影响     

敖日格乐  嘎尔迪 《家畜生态》1994,15(4):12-16

本试验研究了不同气候条件对早期断奶犊牛生长发育的影响。结果表明，不同气候对犊牛的生长发育有一定的影响，但犊牛开食料等饲养管理达到犊牛所需的标准，不会影响犊牛的生长发育指标，３个月龄时体重均能达ＮＲＣ饲养标准。在整个试验期呼市地区早期断奶犊牛平均增重为６４．０５ｋｇ，日增重为７０３．８５ｇ，而锡盟东乌旗犊牛平均增重为５７．５０ｋｇ，日增重为６３１．８７ｇ。体高、体长、胸围、十字部高等体尺指标呼市地区犊牛均高于锡盟东乌旗犊牛，而腹围呼市地区略低于锡盟东乌旗犊牛。干物质的进食量，气候条件差的地区有高于相对暖和地区犊牛的趋势。  相似文献   

牛体尺影响因素及其应用   总被引：1，自引：0，他引：1  

张智慧  李伟  韩永胜 《中国畜牧杂志》2018,(1)

牛体尺指标在一定程度上可以评价品种优劣及生产性能的高低。本文对影响牛体尺的因素做一综述,并从体尺与估测体重、屠宰性能、种公牛繁殖性能、奶牛产奶性能4个方面概述牛体尺应用情况,以期为今后生产中评估牛的肉用经济价值、群遗传选育、改善群体繁殖性能和提高生产性能提供一定的借鉴和指导。  相似文献   

Quantifying Associations among Dimensions of Ears and Their Form Factors in Maize (Zea Mays) Using Dimensional Analysis     

Hongbo CAO  Gaimei LIANG  Jinzhong YANG 《农业科学与技术》2016,(10):2287-2292

  相似文献   

半胱胺对育成期水貂生长和饲料转化率的影响     

王忠艳 《东北林业大学学报》2011,39(4):105-106,109

选择健康育成期水貂208只,其中200只为试验组,8只为对照组,采用二因子试验设计:一个因子为半胱胺的不同添加量,分别按每千克体质量添加10、40、70、100、130 mg半胱胺;另一因子为半胱胺的不同添加间隔时间,分别为1、3、5、7、9 d 5个时间间隔.通过饲养试验研究了半胱胺对育成期水貂体质量增加、饲料转化率...  相似文献   

Associations between postpartum diseases and milk yield and changes in body condition between drying off and parturition of dairy cows in Argentina     

P Melendez  F Bargo  G Tuñón  J Grigera 《New Zealand veterinary journal》2020,68(5):297-303

ABSTRACT

Aims: To assess the change in body condition score (BCS) during the early and late dry periods and its association with postpartum diseases and milk yield in grazing dairy cows from central Argentina.

Methods: BCS assessments during the dry period, and cow health and milk production records up to 90 days in milk (DIM), were collated for cows from 28 farms at monthly visits between 2007 and 2008. Cows were categorised into four groups; those in Group 1 (n=7,067) maintained or gained BCS during the early and late dry periods; Group 2 (n=2,615) maintained or gained BCS during the early dry period and lost BCS during the late dry period; Group 3 (n=1,989) lost BCS during the early dry period and maintained or gained BCS during the late dry period; and Group 4 (n=5,144) lost BCS during the early and late dry periods.

Results: Cows in Group 1 had reduced odds of having retained fetal membranes (RFM), metritis, and clinical mastitis up to 90 DIM than cows in Group 2 (p<0.001), but the odds of disease were similar to cows in Group 3. The odds of having RFM or clinical mastitis tended to be lower in cows in Group 1 than cows in Group 4 (p=0.08). The odds of cows being culled or dying during the first 90 DIM were lower for cows in Group 1 than for those in Groups 2, 3, and 4 (p≤0.05). Mean accumulated milk yield up to 90 DIM was higher in cows in Group 1 than Group 2 and Group 4 (p<0.001), but was similar to that of cows in Group 3 (p=0.28).

Conclusions and clinical relevance: Cows that lost BCS during the late dry period had increased odds of being diagnosed with several postpartum diseases and had decreased milk yield compared to cows that maintained or gained BCS during the entire dry period. Loss of BCS during any stage of the dry period was also associated with increased incidence of culling or death during the first 90 DIM. These results should raise awareness among dairy cattle producers of the importance of properly managing cow body condition during the dry period, especially during the late dry period.  相似文献   

K步稳定的鞋印花纹图像自动聚类     

王新年  舒莹莹 《上海交通大学学报(农业科学版)》2016,(5):574-587

目的 鞋印是刑事侦查的重要物证之一,如何对积累的大量鞋印花纹图像进行自动归类管理是刑事技术迫切需要解决的问题之一。与其他类图像不同,鞋印花纹图像具有种类多但数目未知、同类花纹分布不均匀且同类花纹数目少的特点。基于鞋印花纹图像的这些特点,用目前典型的聚类算法对鞋印花纹图像集进行聚类,并不能取得很好的效果。在对鞋印花纹图像进行分析的基础上,提出一种K步稳定的鞋印花纹图像自动聚类算法。方法 对已标记的鞋印花纹图像进行统计发现,各类鞋印花纹之间在特征空间上存在互不相交的区域(本文称为隔离带)。算法的核心思想是寻找各类鞋印花纹之间的隔离带,来将各类分开。过程为:以单调递增或递减的方式调整特征空间中判定两点为一类的阈值,得到数据集的多次划分;若在连续K次划分的过程中,某一类的成员不发生变化,则说明这K次调整是在隔离带中进行的,即聚出一类,并从数据集中删除已标记的数据;选择下一个阈值对剩余的数据集进行划分,输出K步不变的类;依此类推,直到剩余数据集为空,聚类完成。结果 在两类公开测试数据集和实际鞋印花纹数据集上进行实验,本文算法的主要性能指标都超过典型算法,其中在包含5792枚实际鞋印花纹数据集上的聚类准确率和F-Measure值分别达到了99.68%和95.99%。结论 针对鞋印花纹图像特点,提出了一种通过寻找各类之间的隔离带进行自动聚类的算法,并在实际应用中取得了很好的效果。且算法性能受参数的变化以及类的形状影响较小。本文算法同样适用于具有类似特点的其他数据集的自动聚类。  相似文献   

Assessment of Vein Diameter and Body Surface Temperature after High-Intensity Laser Therapy (HILT) on the Tarsal Joint in Healthy Horses     

《Journal of Equine Veterinary Science》2020

The aim of the study was to assess the influence of high-intensity laser therapy (HILT) on vein diameter and on body surface temperature changes in the tarsal joint area in a group of clinically healthy racehorses. The hypothesis of the study was that HILT increases vein diameter and body surface temperature in healthy tissue. The study involved 16 Thoroughbreds being subjected to ultrasonographic examination to assess changes of diameter of the cranial branch of the medial saphenous vein and thermographic examination to indicate temperature change of the dorsal surface of the tarsal joint, just before and immediately after HILT treatment. Vein diameter and mean surface temperature of the tarsal joint significantly increased after HILT treatment. In addition, the study was the first to describe the photothermal effect of HILT in healthy horses. More studies are necessary to specify the parameters of the procedure, that is, wavelength, energy density, or time of the procedure, depending on the patient’s individual characteristics and type of tissue.  相似文献   

几种修剪树型对'珍珠'番石榴开花坐果及产量的影响     

刘清国  欧珍贵  龚德勇  谢忠武 《中国园艺文摘》2011,27(3):11-13

选用4年生'珍珠'番石榴为试脸材料,采用开心形、圆头形、平头形树型结构,以果树生产中采用的自然圆形树型结构为对照,研究4种树型修剪方法对'珍珠'番石榴新梢数、花蕾数、开花结果数及果实产量的影响.试验结果表明,'珍珠'番石榴树型圆头形、开心形促进开花坐果较好,圆头形有利于提高产量.  相似文献