• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Animal Science >Effects of calcium magnesium carbonate and roughage level on feedlot performance, ruminal metabolism, and site and extent of digestion in steers fed high-grain diets
【24h】

Effects of calcium magnesium carbonate and roughage level on feedlot performance, ruminal metabolism, and site and extent of digestion in steers fed high-grain diets

机译：高谷物日粮中碳酸钙镁和粗饲料水平对肉牛生产性能，瘤胃代谢以及消化部位和消化程度的影响

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

A feedlot growth performance experiment and 2 metabolism experiments were conducted to evaluate dietary roughage concentration and calcium magnesium carbonate in steers fed a high-grain diet. In Exp. 1, one hundred ninety-two crossbred yearling steers (320 +/- 10 kg of initial BW) were fed diets based on steam-flaked corn with 0, 0.75, or 1.5% CaMg(CO(3))(2). There were no effects (P > or = 0.13) on ADG, DMI, G:F, or total water intake due to CaMg(CO(3))(2). In Exp. 2, five ruminally and duodenally fistulated steers (263 +/- 9 kg of initial BW) were used in a 5 x 5 Latin square design, with 5 dietary treatments arranged in a 2 x 2 + 1 factorial: 1) 3.8% dietary roughage and no CaMg(CO(3))(2); 2) 7.6% dietary roughage and no CaMg(CO(3))(2); 3) 11.4% dietary roughage and no CaMg(CO(3))(2); 4) 3.8% dietary roughage and 1.5% CaMg(CO(3))(2); and 5) 7.6% dietary roughage and 1.5% CaMg(CO(3))(2). Water consumption was less (quadratic, P = 0.003) when 7.6% dietary roughage was fed compared with 3.8 or 11.4% dietary roughage. Intake of DM was not affected (P > or = 0.16) by dietary roughage or by CaMg(CO(3))(2). Poststomach and total tract starch digestion decreased (linear, P < 0.01) as dietary roughage increased. Ruminal pH tended (P = 0.08) to increase as dietary roughage increased but was not affected (P = 0.60) by CaMg(CO(3))(2). In Exp. 3, DMI and ruminal pH were continuously monitored in a 6 x 6 Latin square design using 6 ruminally and duodenally fistulated Holstein steers (229 +/- 10 kg of initial BW). A 3 x 2 factorial treatment structure was utilized, with factors consisting of dietary roughage concentration (4.5, 9.0, or 13.5%) and CaMg(CO(3))(2) inclusion (0 or 1.0%) to replace MgO and partially replace lime-stone. A dietary roughage x CaMg(CO(3))(2) interaction (P = 0.01) occurred as steers consuming 13.5% roughage, 1.0% CaMg(CO(3))(2) had greater DMI per meal than those consuming 4.5% dietary roughage, no CaMg(CO(3))(2) and 9.0% dietary roughage, 1.0% CaMg(CO(3))(2). Steers consuming 13.5% dietary roughage, 1.0% CaMg(CO(3))(2) and 9.0% dietary roughage, no CaMg(CO(3))(2) had greater meal length (min/meal; P = 0.01) than steers consuming 4.5% dietary roughage, no CaMg(CO(3))(2). Total tract OM digestibility decreased linearly (P = 0.01), and ruminal pH increased linearly (P = 0.01) with increasing dietary roughage concentration. Inclusion of CaMg(CO(3))(2) can replace limestone and MgO but did not produce ruminal pH responses similar to those observed by increasing dietary roughage in high-concentrate diets.
机译：进行了肥育场生长性能实验和2个新陈代谢实验，以评估饲喂高谷物日粮的ste牛的粗饲料浓度和碳酸钙镁。在实验中1，向192头杂交一岁ste牛（初始体重为320 +/- 10千克）饲喂基于含0、0.75或1.5％CaMg（CO（3））（2）的蒸玉米片的日粮。对CaMg（CO（3））（2）的ADG，DMI，G：F或总饮水量没有影响（P>或= 0.13）。在实验中2，在5 x 5拉丁方形设计中使用了5个瘤胃和十二指肠f牛（初始体重263 +/- 9 kg），并以2 x 2 +1分解因子安排了5种饮食处理：1）3.8％的饮食粗饲料并且没有CaMg（CO（3））（2）; 2）7.6％的食物粗饲料且不含CaMg（CO（3））（2）; 3）11.4％的饮食粗饲料且​​不含CaMg（CO（3））（2）; 4）3.8％的粗饲料和1.5％的CaMg（CO（3））（2）; 5）7.6％的粗饲料和1.5％的CaMg（CO（3））（2）。饲喂7.6％的饲料粗饲料时的耗水量较少（二次方，P = 0.003），而3.8％或11.4％的饲料为粗饲料。粗饲料或CaMg（CO（3））（2）不会影响DM的摄入量（P>或= 0.16）。随着饮食粗饲料的增加，胃后和全道淀粉的消化率降低（线性，P <0.01）。瘤胃pH值会随着饮食粗饲料的增加而增加（P = 0.08），但不受CaMg（CO（3））（2）的影响（P = 0.60）。在实验中如图3所示，使用6个瘤胃和十二指肠瘘的荷斯坦ste牛（229 +/- 10 kg初始体重）以6 x 6拉丁方形设计连续监测DMI和瘤胃pH。利用3 x 2阶乘处理结构，其因素包括饮食粗饲料浓度（4.5、9.0或13.5％）和CaMg（CO（3））（2）夹杂物（0或1.0％）来代替MgO和部分代替石灰石。饮食粗饲料x CaMg（CO（3））（2）相互作用（P = 0.01）发生，原因是ers牛消耗粗饲料13.5％，1.0％CaMg（CO（3））（2）每餐的DMI高于食用4.5％的粗饲料膳食粗饲料，无CaMg（CO（3））（2）和9.0％膳食粗饲料，1.0％CaMg（CO（3））（2）。食用13.5％饮食粗饲料，1.0％CaMg（CO（3））（2）和9.0％饮食粗饲料的公牛，没有CaMg（CO（3））（2）的进餐时间（分钟/餐; P = 0.01）大于引导食用4.5％的饮食粗饲料，无CaMg（CO（3））（2）。随着日粮粗饲料浓度的增加，总道OM消化率线性下降（P = 0.01），瘤胃pH线性上升（P = 0.01）。包含CaMg（CO（3））（2）可以代替石灰石和MgO，但不会产生类似于通过在高浓度饮食中增加粗饲料而观察到的瘤胃pH响应。

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