荷斯坦后备奶牛生长发育规律的研究进展

来源 :畜牧与兽医 | 被引量 : 0次 | 上传用户:zy197855
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
后备奶牛处于生长发育旺盛阶段,其培育的好坏直接影响成年奶牛的生长和生产.在生产实践中正确认识其生长发育规律,对奶牛的饲养管理有着重要的指导意义.本文结合后备奶牛的饲养管理要点、生长发育特点,综述了荷斯坦后备奶牛在体重和体尺方面的生长发育规律,为今后后备奶牛的科学饲养提供借鉴.
其他文献
为了解新疆地区畜间布病流行情况及病原学特征,提升该病诊断水平,为新疆制定布病防控策略提供科学依据.2012-2014年选定新疆伊犁地区、和田地区、哈巴河县、温宿县为布病流调
Based on the analysis of the characteristics of synthetic aperture radar(SAR)images,a new edge detection method is proposed.The wedgelet transform is introduced
The paper presents an energy iterative method to determine the second critical velocity by comparing the time histories of the kinetic energy and the buckling d
对某规模场鸡群采集的23份鸡咽喉或泄殖腔棉拭子进行病原分离,通过血凝、血凝抑制试验和RT-PCR检测,证实分离出17株新城疫病毒(NDV).对F、HN基因经RT-PCR扩增、克隆并对其进
对安徽部分地区疑似传染性浆膜炎的病鸭、鹅脑组织进行病原菌分离鉴定及病理学观察;经PCR鉴定,确定为鸭疫里氏杆菌.分别对5株分离菌的16S rRNA基因和OmpA基因进行核苷酸序列
Software reliability was estimated based on NHPP software reliability growth models. Testing reliability and operational reliability may be essentially differen
A bonding process for space solar cells implemented by an automated coating and bonding system was theoretically investigated for future parametric studies to a
In order to overcome the obstacle of singular integral in boundary element method (BEM), wepresented an efficient sound field reconstruction technique based on
Aiming at the limitation of control accuracy caused by hysteresis and creep for a piezoelectric actuator, the hysteresis phenomenon is explained based on the mi
念珠菌是人畜浅表部位的常见病原,当机体免疫功能受抑制或者长期使用抗生素时,念珠菌可引起皮下及系统性的感染.为对一例急性肾损伤恢复期继发膀胱炎并出现发烧的病例进行诊