合理淘汰散栏饲养成年母牛的研究

Studies on the proper culling of cows in the free stall feeding system

据洛阳市奶牛一场 1990～ 1995年散栏饲养的成母牛的记录 ,统计淘汰牛只的年龄、淘汰原因、泌乳期奶量、干奶期、空怀期 .分析表明 ,要做到合理利用奶牛 ,应尽量减少疾病 ,降低非生产性淘汰之比例 .产奶量在第 1,8,9,10泌乳期较低 ;空怀期以第 1,2 ,7,8,9泌乳期的较长 .宜把第 1,2泌乳期和第

The culling ages,culling reasons,lactation yields,dry periods and opendays were analysed based on the data collected from cows in free stall system of Luoyang dairy farm in 1990～1995.The results indicated that in order to use the dairy cows efficiently diseases should be prevented and the proportion of unproductive culling should be reduced as far as possible.The milk yields of the 1 st and the 8 th ,9 th ,10 th lactation periods were relatively lower.The opendays of the 1 st ,2 nd and the 7 th ,8 th ,9 th lactation periods were longer.It is suggested that the 1 st ,2 nd and the 7 th lactation should be regarded as the key periods for culling.