摘要
本研究旨在探讨日粮钙水平对空怀期云南半细毛羊各营养成分消化代谢的影响,为云南半细毛羊钙需要量的标准制定提供数据支撑。试验选取50只空怀期体况健康、体重接近、经产两胎的云南半细毛羊,随机分成5组,分别饲喂5种不同钙含量日粮(0.48%,0.67%,0.82%,1.00%和1.13%)。试验分为预试期(14 d)和正试期(30 d),在正式期第7天从每个试验组中随机选取5只羊,放入代谢笼进行为期7 d的消化代谢试验。试验结果表明,随着日粮钙含量的升高,空怀期云南半细毛羊的干物质采食量总体呈先下降后升高趋势(P>0.05)。各养分的表观消化率没有受到日粮钙含量的影响(P>0.05)。空怀期云南半细毛羊日粮钙水平越高,粪钙的排出量越大(P<0.05),排泄钙量也越大(P<0.05)。通过回归分析,由不同钙水平日粮对平均日增重的线性关系得出,空怀期云南半细毛羊的钙维持需要量为7.93 g/d(R2=0.5827)。摄入钙与沉积钙之间的线性回归分析表明,空怀期云南半细毛羊沉积钙最大值为3.64 g/d。综上所述,空怀期云南半细毛羊日粮钙水平的提高,对干物质采食量有一定的影响,而对各养分的表观消化率没有显著影响。空怀期云南半细毛羊粪钙和排泄钙随着日粮钙水平的提升而升高。不同日粮钙水平下空怀期云南半细毛羊摄入钙与日增重的相关性不大。
The study was conducted to investigate the effects of different dietary calcium levels on nutrient digestion and metabolism of Yunnan semi-fine wool sheep during the empty pregnant period,and to provide basis for formulating the standard of calcium requirement of Yunnan semi-fine wool sheep.Fifty Yunnan semi-fine wool sheep with healthy body condition,close body weight and 2 births were randomly allocated to 5 groups,which were groupsⅠ(0.44%calcium),Ⅱ(0.67%calcium),Ⅲ(0.82%calcium),Ⅳ(1.00%calcium)andⅤ(1.13%calcium).The experiment was divided into pre-trial period(14 days)and formal period(30 days).On the 7th day of the formal period,five sheep were randomly selected from each experimental group and placed in separate metabolic cages for digestive and metabolic tests.The experimental results showed that:With the increase of dietary calcium content,the dry matter intake of Yunnan semi-fine wool sheep in empty pregnant period decreased at first and then increasing(P>0.05).The higher the dietary calcium level of Yunnan semi-fine wool sheep in empty pregnant period,the greater the excretion of fecal calcium(P<0.05),and the greater the excretion of calcium(P<0.05).Regression analysis showed that the calcium maintenance requirement of Yunnan semi-fine wool sheep in empty pregnant period was 7.93 g/d and R2=0.5827 according to the linear relationship between different calcium levels of diets and average daily gain.Linear regression analysis between calcium intake and deposited calcium showed that the maximum deposited calcium of Yunnan semi-fine wool sheep during empty pregnant period was 3.64 g/d.In conclusion,the increase of dietary calcium level of Yunnan semi-fine wool sheep during empty pregnant period had a certain effect on dry matter intake,but had no significant effect on the apparent digestibility of each nutrient.Fecal calcium and excreted calcium of Yunnan semi-fine wool sheep in empty pregnant period increased with the increase of dietary calcium level.Under different dietary calcium levels,the calcium intake level had little correlation with the daily gain of Yunnan semi-fine wool sheep in empty pregnant period.
作者
梁家充
欧阳依娜
李银江
李卫娟
王思宇
薛白
洪琼花
LIANG Jiachong;OUYANG Yina;LI Yinjiang;LI Weijuan;WANG Siyu;XUE Bai;HONG Qionghua(Yunnan Animal Science and Veterinary Institute,Kunming 650224,China;Animal Nutrition Institute,Sichuan Agricultural University,Chengdu 611130,China)
出处
《中国畜牧兽医》
CAS
北大核心
2020年第12期3944-3952,共9页
China Animal Husbandry & Veterinary Medicine
基金
国家绒毛用羊产业技术体系(CARS39-08)。
关键词
云南半细毛羊
干物质采食量
养分代谢率
钙需要量
Yunnan semi-fine wool sheep
dry matter intake
nutrient metabolic rate
calcium requirement
