| 摘要: |
| 运用消化试验研究肉牛粪磷排泄量与进食磷量之间的关系,选用体况良好、体重相近((369.5±37.8) kg)的杂交后备母牛(西门塔尔牛(♂)×中国黄牛(♀))24头,随机分为6组,分别定量(3.50 kg/d)饲喂6种不同磷水平(质量分数分别为0.38%、0.45%、0.50%、0.56%、0.61%和0.67%,DM基础)的精料,粗料(青贮)自由采食。总试验期为30 d,预饲期20 d,正试期10 d(其中采样期7 d)。饲料样及粪样均测定其中磷和DM含量,计算粪磷排泄量与日粮磷进食量的回归关系。结果表明:精料磷水平对后备母牛日粮干物质采食量无显著影响(P>0.05)。以g/d为单位,粪磷排泄量与日粮磷进食量的关系为y=1.004 3x－ 8.726 8(R2=0.829 8,P<0.05,n=24);以g/kg (DMI)为单位,粪磷排泄量与日粮磷进食量的关系为y = 0.933 0x－1.169 9(R2 = 0.828 2,P<0.08,n=24)和y=0.631 7x＋0.081 9(R2=0.571 1,P<0.05,n=20)。综合分析,后备母牛粪磷排泄量与日粮磷进食量高度正相关。 |
| 关键词: 肉牛 后备母牛 磷 采食量 排泄量 |
| DOI：10.11841/j.issn.1007-4333.2011.03.021 |
| 投稿时间：2010-10-30 |
| 基金项目:公益性行业(农业)科研专项(nyhyzx07-035);国家肉牛产业技术体系项目(ngcytx-38) |
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| Relationships between the fecal phosphorus excretion and the dietaryphosphorus intake in simmental crossbreed heifers |
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XU Jian-hai1, JIANG Jun2, JIN Ruo-qing1, CAO Qiong1, HUANG Jie1, LI Qiang3, MO Fang1,2
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| (1.College of Animal Science and Technology/State Key Laboratory for Animal Nutrition,China Agricultural University,Beijing 100193,China;2.Feed Nutrient Function Laboratory for National Beef Cattle Industry Technology System,China Agricultural University,Beijing 100193,China;3.Animal Husbandry and Veterinary Bureau of Ganzhou,Zhangye 734000,China) |
| Abstract: |
| The aim of this study was to evaluate the relationships between the fecal P excretion and the dietary P intake by digestion trial in beef cattle.Twenty-four crossbreed heifers (Simmental×local cattle,BW=369.5±37.8 kg) were selected and randomly assigned to six dietary treatments,which contained phosphorus at the level of 0.38%,0.45%,0.50%,0.56%,0.61% and 0.67% in concentration (DM basis),respectively.Animals were fed the roughage once a day ad libitum,and the concentrate was supplied in two equal amounts (3.50 kg/d).A 10-day digestion trial was included in this 30 days experiment.Total feces were collected and recorded for each cattle during the last 7 days of the experiment.Daily feed offerings and refusals were measured to obtain net feed intake for each animal.Animal feeds and feces were preserved for further analyses of P and DMI.The linear regression analysis was used to study the relationships between the fecal P excretion and the dietary P intake.Results showed that: The levels of concentrate P had no significant influence on DMI (P>0.05).The linear relationship between fecal P execrated and dietary P intake was y=1.004 3x- 8.726 8 (R2=0.829 8,P<0.05,n=24) if it was measured as g/d unit,then was y=0.933 0x-1.169 9 (R2=0.828 2,P<0.08,n=24) and y=0.631 7x+0.081 9 (R2=0.571 1,P<0.05,n=20) if measured as g/kg DMI unit.It was suggested that faecal P excretion increased linearly as dietary P intake increased. |
| Key words: beef cattle heifer phosphorus intake excretion |
