检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
机构地区:[1]张家口农业高等专科学校畜牧系,075131 [2]张家口农业高等专科学校动物医学系,075131
出 处:《河北北方学院学报(自然科学版)》1996年第3期28-34,共7页Journal of Hebei North University:Natural Science Edition
摘 要:根据家兔的生活习性和高寒地区的气候特点,设计出四种兔舍和两种兔笼,经实践应用,效果良好。张北试区采用此设计以来,母兔年产仔由过去的2~3胎提高到7.24胎,年提供商品兔数由过去的7.52只提高到42只,商品兔育成率由过去的30%~50%提高到93.2%。According to the living habits of rabbit and the climate characteristics in the colder regions, several kinds of rabbit house and hutch were designed for rabbits in this paper. The effect of them was very good in the practice. The heat-preserving effect of three kinds of house was notable, and the WRP (winter reproduction) have achieved success in the house. Since utilizing these designs, the number of births of a female rabbit had been increased from 2~3 births/year to 7.24 births/year, The number of merchandise rabbit from 7. 52 rabbits/year to 42 rabbits/year. The survical rate of the merchandise rabbit had been increased from 30%~50% to 93. 2%.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.118