西门塔尔杂交后备母牛粪磷排出量与日粮磷进食量的关系  

Relationships between the fecal phosphorus excretion and the dietary phosphorus intake in simmental crossbreed heifers

作　　者：许建海[1] 姜军[2] 靳若青[1] 曹琼[1] 黄洁[1] 李强 莫放[1,2] 

机构地区：[1]中国农业大学动物科技学院/动物营养国家重点实验室,北京100193 [2]中国农业大学国家肉牛产业技术体系饲料营养功能研究室,北京100193 [3]张掖市甘州区畜牧兽医局,甘肃张掖734000

出　　处：《中国农业大学学报》2011年第3期122-126,共5页Journal of China Agricultural University

基　　金：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)

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。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（P0.05）.The linear relationship between fecal P execrated and dietary P intake was y=1.004 3x-8.726 8（R2=0.829 8,P0.05,n=24） if it was measured as g/d unit,then was y=0.933 0x-1.169 9（R2=0.828 2,P0.08,n=24） and y=0.631 7x＋0.081 9（R2=0.571 1,P0.05,n=20） if measured as g/kg DMI unit.It was suggested that faecal P excretion increased linearly as dietary P intake increased.

关 键 词：肉牛 后备母牛 磷 采食量 排泄量 

分 类 号：S827[农业科学—畜牧学]