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
作 者:王润莲[1] 张微[2] 张玉枝[2] 张春香[2] 程建波[2] 贾志海[2]
机构地区:[1]广东海洋大学动物科学系,湛江524088 [2]中国农业大学动物科学技术学院,北京100094
出 处:《动物营养学报》2007年第5期534-538,共5页CHINESE JOURNAL OF ANIMAL NUTRITION
基 金:国家高技术研究发展计划(863计划)资助项目(2002AA241181)
摘 要:本试验研究不同钴水平对肉羊维生素B12的合成、瘤胃发酵及造血机能的影响。20只健康、体重相近(2 7.3±0.9)kg的杂交一代羯羊,平均分为5组,分别饲喂基础日粮(含钴0.0 8 6 mg/kg)、基础日粮中添加0.2 5、0.5 0、0.7 5和1.00 mg/kg钴的试验组日粮,饲粮进食量相同,试验期8周。结果表明,基础日粮中0.086 mg/kg的钴不能满足肉羊的需要,添加0.25~1.00 mg/kg钴,可促进瘤胃维生素B12的合成,其合成量随饲喂时间的延长而增加,6周后趋于稳定,第6、8周的平均值为31.70~44.83 nmol/L,钴的添加量低于0.50 mg/kg时瘤胃维生素B12的含量增加较快,超过该量增加的幅度延缓。添加0.50 mg/kg的钴可显著增加瘤胃总挥发性脂肪酸的产生量并使其中丙酸比例增加、异丁酸和异戊酸比例降低。添加0.25 mg/kg的钴即可维持正常的造血功能。建议肉羊日粮中钴的适宜添加水平为0.25~0.50 mg/kg(即适宜日粮钴水平为0.336~0.586 mg/kg)。To evaluate the effects of different inclusion levels of dietary cobalt on vitamin B12 synthesis, rumen fermentation and blood parameters of sheep, twenty cannulated wethers with an average weight (27.3 ± 0.9) kg were randomly divided into five groups and fed diets supplemented with increasing levels of cobalt (0, 0.25, 0.50, 0.75 and 1.00 mg Co/kg DM) for 8 weeks. Results showed cobalt content of control diet (0.086 mg Co/kg DM) was inadequate for achieving optimal rumen fermentation and sustaining normal blood function. Supplementation of 0.25, 0.50, 0.75 and 1.00 mg Co/kg DM significantly (P〈0.05) improved rumen vitamin B12 concentration which was increased after feeding time, but being stable 6 weeks with the average values of 1.70, 40.96, 42.92 and 44.83 nmol/L at the end of 6 and 8 weeks of feeding respectively. Lambs supplemented with 0.50 mg Co/kg DM seemed to be beneficial for rumen total volatile fatty acid production and molar proportion of propionate, whereas iso-acids were impaired by Co supplementation. Supplemention of 0.25 mg Co/kg DM is enough to meet the requirement of sustaining normal blood function. Supplemention of Co for lambs is recommended to be 0.25 to 0.50 mg/kg DM (total diet Co is 0. 336-0. 586 mg/kg DM).
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:216.73.216.66