CAJ | 학술논문

为提高奶牛乳蛋白含量和饲料蛋白质用于产奶的转化效率,选择体况、胎次、泌乳期相近的中国荷斯坦奶牛27头,采用L9（34）正交试验设计,研究奶牛不同小肠可消化蛋白（IDCP）供应水平日粮添加过瘤胃保护氨基酸（RPAA）对乳蛋白率含量和IDCP转化为乳蛋白效率的影响。结果表明,IDCP按《中国奶牛饲养标准》（2004）推荐需要量92%水平供应,组合添加过瘤胃保护赖氨酸（RPlys）32 g/d＋过瘤胃保护蛋氨酸（RPmet）8 g/d,日粮干物质中NDF水平控制在37%～41%,可有效提高泌乳前期奶牛乳蛋白含量与IDCP用于泌乳的转化效率。
위제고내우유단백함량화사료단백질용우산내적전화효솔,선택체황、태차、비유기상근적중국하사탄내우27두,채용L9（34）정교시험설계,연구내우불동소장가소화단백（IDCP）공응수평일량첨가과류위보호안기산（RPAA）대유단백솔함량화IDCP전화위유단백효솔적영향。결과표명,IDCP안《중국내우사양표준》（2004）추천수요량92%수평공응,조합첨가과류위보호뢰안산（RPlys）32 g/d＋과류위보호단안산（RPmet）8 g/d,일량간물질중NDF수평공제재37%～41%,가유효제고비유전기내우유단백함량여IDCP용우비유적전화효솔。
An experiment was conducted to promote the protein percentage in milk and conversion efficiency of feed protein to be used for lactation was performed.Twenty seven hatching lactating Chinese Holstein cattle at close calving parity,same milk stage and good body condition were given different levels of intestinal digestible crude protein（IDCP） and ruminal protected amino acids（RPAA） in a L9（34） orthogonal experimental design.The results indicate that provision of available IDCP accounting for 92% of the requirement recommended by China Feeding Standard Of Dairy Cattle（2004 edition） combining with the supplement of ruminal protected lysine（RPlys） 32 g/d ＋ ruminal protected methionine（RPmet） 8 g/d,and neutral detergent fiber（NDF） of 37% to 41% in diet dry matter could effectively increase the protein percentage in milk and the conversion efficiency of protein used for milk production in lactation dairy cows.