畜牧与饲料科学2012，Vol.33Issue(5)：13-17,5.
不同粗饲料品质（GI）与不同精料给量水平对奶牛生产性能影响的研究
Effects of Different Quality of Roughage （ GI ） and Different Concentrate Supply Level on the Production Performance of Dairy Cows
摘要
Abstract
In order to perfect the second generation of GI technical standard system, GI value of roughage and the milk yield were taken as parameters to set up the forecast model of the best supply level of concentrate in the diet of diary cows. 36 healthy Chinese Holstein cows in middle lactation stage were selected and randomly divided into 3 big groups （ with 3 groups in each big group, with 4 cows in each group ） according to the principles of with the same milk yield ,lactation period and similar fetal times. In the first big group ,yellow corn silage was used as roughage and the ratio of concentrate to roughage was 55：45,57.5：42.5 and 60：40 respectively, named as A1, A2 and A3. In the second big group, yellow corn silage and A neurolepidium chinense were used as roughage and the ratio of concentrate to roughage was 55：45,57.5：42.5 and 60：40 respectively, named as B1 ,B2 and B3. In the third big group,whole corn silage and A neurolepidium chinense were used as roughage and the ratio of concentrate to roughage was 55：45,57.5：42.5 and 60：40 respectively, named as CI ,C2 and C3. The effects of different roughage level （GI） and different concentrate supply level on the production performance of lactating dairy cows were studied. The results showed that lactoprotein, lactose and milk yield showed increasing trends and milk fat showed a decrease trend with the increasing of concentrate proportion. The ratio of concentrate to roughage had significant effects on milk yield （P〈0.05）and had some influences on milk composition （P〈0.05）. With the increase of roughage quality （GI）, milk fat and milk yield showed an increasing trend, and lactoprotein and lactose decreased, but its effects on milk fat, lactoprotein and lactose were not significant （P 〉0.05 ）, the effects on milk yield was significant （P〈0.05）.关键词
粗饲料品质/精、粗饲料比：产奶量Key words
roughage quality/ratio of concentrate to roughage/milk yield分类
农业科技引用本文复制引用
刘峰,杜瑞平,高民..不同粗饲料品质（GI）与不同精料给量水平对奶牛生产性能影响的研究[J].畜牧与饲料科学,2012,33(5):13-17,5.基金项目
现代农业产业技术体系建设专项资金资助（CARS-37）. （）
