饲粮磷水平对生长奶水牛生长性能、养分表观消化率和磷排泄的影响  

Effects of Dietary Phosphorus Level on Growth Performance,Nutrient Apparent Digestibility and Phosphorus Excretion of Growing Dairy Buffaloes

作　　者：陈月丽[1,2] 罗华东 梁煜阳 阮莉珺 邹彩霞 夏中生[1] CHEN Yueli;LUO Huadong;LIANG Yuyang;RUAN Lijun;ZOU Caixia;XIA Zhongsheng(College of Animal Science and Technology,Guangxi University,Nanning 530005,China;Jiangsu Guiliu Animal Husbandry Group Co.,Ltd.,Xuzhou 221600,China)

机构地区：[1]广西大学动物科技学院,南宁530005 [2]江苏桂柳牧业集团有限公司,徐州221600

出　　处：《动物营养学报》2024年第12期7799-7808,共10页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：广西科技重大专项(桂科AA22068099-5);广西自然科学基金(2021GXNSFAA196034)。

摘　　要：本试验旨在研究饲粮磷水平对生长奶水牛生长性能、养分表观消化率和磷排泄的影响。选择体重相近的11月龄健康奶水牛24头,随机分成4组,每组6头,每头奶水牛为1个重复。4组奶水牛所喂试验饲粮磷水平分别为0.21%、0.24%、0.27%、0.30%,其他营养水平保持一致。试验期共52 d,包括10 d的预试期和42 d的正试期。在正试期结束前5 d,从各组随机选取3头奶水牛进行为期5 d的消化代谢试验。结果显示:1)饲粮磷水平对生长奶水牛的初重、末重、干物质采食量和平均日增重的影响均不显著(P>0.05),但对于料重比有显著影响(P<0.05),21%磷水平组的料重比显著高于其他3组(P<0.05)。2)饲粮磷水平对生长奶水牛的干物质、粗蛋白质和磷表观消化率有显著影响(P<0.05),0.27%磷水平组的干物质、粗蛋白质、钙和磷的表观消化率均为4组中最高。3)饲粮磷水平对生长奶水牛的食入磷、粪磷、尿磷、总排泄磷和每千克代谢体重排泄磷均有显著影响(P<0.05)。4)生长奶水牛食入磷(X,g/d)与每千克代谢体重排泄磷[Y,g/(kg W^(0.75)·d)]的线性回归方程为Y=0.0091 X+0.0447(R^(2)=0.9541),根据回归方程得出生长奶水牛的磷维持需要量为0.13 g/(kg W^(0.75)·d)。结合奶水牛生长性能、养分表观消化率及磷排泄,得出生长奶水牛的饲粮磷水平以0.27%为宜。The aim of this experiment was to study the effects of dietary phosphorus level on the growth performance,nutrient apparent digestibility and phosphorus excretion of growing dairy buffaloes.Twenty-four healthy 11-month-old dairy buffaloes with similar body weight were selected and randomly divided into four groups of six buffaloes each,with one replication per buffalo,and fed experimental diets with phosphorus level of 0.21%,0.24%,0.27%and 0.30%,respectively,and other nutrient levels of the experimental diets were maintained at the same level.The total experimental period was 52 days,including a 10-day pre-feeding period and a 42-day formal trial period.Three buffaloes were randomly selected from each group for a 5-day digestive metabolism test during the last 5 days of the formal trial period.The results showed as follows:1)dietary phosphorus level had no significant effects on the initial body weight,final body weight,dry matter intake and average daily gain of growing dairy buffaloes(P>0.05),but had a significant effect on the feed-to-gain ratio(P<0.05),the feed-to-gain ratio of 21%phosphorus level group was significantly higher than that of other 3 groups(P<0.05).2)Dietary phosphorus level had significant effects on the apparent digestibility of dry matter,crude protein and phosphorus(P<0.05).The apparent digestibility of dry matter,crude protein,calcium and phosphorus in the 0.27%phosphorus level group was the highest among the four groups.3)Dietary phosphorus level had significant effects on phosphorus intake,fecal phosphorus,urine phosphorus,total phosphorus excretiona and phosphorus excretion per kilogram of metabolic body weight(P<0.05).4)The linear regression equation of phosphorus intake(X,g/d)and phosphorus excretion per kilogram of metabolic body weight[Y,g/(kg W^(0.75)·d)]for growing dairy buffaloes was Y=0.0091 X+0.0447(R^(2)=0.9541),and the phosphorus maintenance requirement for growing dairy buffaloes was 0.13 g/(kg W^(0.75)·d)according to the regression equation.In conclusion,dietary phosphoru

关 键 词：饲粮磷水平 生长奶水牛 生长性能 养分表观消化率 磷排泄 

分 类 号：S823[农业科学—畜牧学]