• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Energy Conversion & Management >Cultural energy analyses of dairy cattle receiving different concentrate levels
【24h】

Cultural energy analyses of dairy cattle receiving different concentrate levels

机译：不同浓缩水平的奶牛的文化能量分析

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Purpose of this study was to conduct cultural energy analyses of dairy cows receiving different levels of concentrate. Data were acquired by conducting a survey on 132 dairy farms selected by the stratified random sampling method. Dairy cattle farms were divided into three groups according to concentrate level and were analyzed. Accordingly concentrate levels were assigned as low (LLC) (<40%, 52 farms), intermediate (ILC) (40-50%, 36 farms) and high (HLC) (>50%, 44 farms). Cultural energy used for feed for cows was calculated by multiplying each ingredient with corresponding values of ingredients from literature. Transportation energy was also included in the analysis. Total cultural energy expended was highest for LLC (P < 0.05). Cultural energy expended for feed constituted more than half of the total cultural energy and was highest for LLC (P < 0.05). Cultural energy expended per kg milk and per Mcal protein energy was higher for LLC (P< 0.05). Efficiency defined as Mcal input/Meal output was better for ILC and was worse for LLC (P< 0.05) and HLC was intermediate thus not differing from other groups. Results show that cultural energy use efficiency does not linearly increases as concentrate level increases and increasing concentrate level does not necessarily mean better efficiency. Thus optimum concentrate level not interfering cows performance should be sought for sustainable dairy production.
机译：这项研究的目的是对接受不同浓度浓缩物的奶牛进行文化能量分析。通过对采用分层随机抽样方法选择的132个奶牛场进行调查获得数据。根据浓缩水平将奶牛场分为三组并进行分析。因此，将精矿含量分配为低（LLC）（<40％，52个农场），中级（ILC）（40-50％，36个农场）和高（HLC）（> 50％，44个农场）。通过将每种成分与文献中相应的成分值相乘，可以计算出用于牛饲料的文化能量。分析中还包括运输能量。 LLC的总文化能量支出最高（P <0.05）。饲料消耗的文化能量占总文化能量的一半以上，LLC最高（P <0.05）。 LLC的每公斤牛奶和每Mcal蛋白质能量消耗的文化能量较高（P <0.05）。 ILC的效率定义为Mcal输入/膳食输出，LLC的效率较差（P <0.05），HLC处于中等水平，因此与其他组没有区别。结果表明，文化能源的利用效率并没有随着浓缩物水平的增加而线性增加，浓缩物水平的提高并不一定意味着效率的提高。因此，为了可持续的乳制品生产，应寻求不影响奶牛性能的最佳浓缩液水平。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号