新美系杜洛克原种猪在育肥期适宜营养水平的研究

Nutritional Requirements on New USA Strain of Duroc Pigs during Finishing Stage

为研究不同能量、粗蛋白质、钙和磷水平对育肥期新美系杜洛克原种猪生产性能及血液生化指标的影响,确定70～90 kg新美系杜洛克日粮中这4种养分的适宜含量。试验选择胎次、断奶日龄及日龄基本相近的体重为(65±2)kg健康新美系杜洛克原种猪36头,采用4因素3水平的L9(34)正交试验设计。试验结果表明:①日粮能量、粗蛋白质和钙水平对生长性能影响差异均不显著(P>0.05),磷水平对日采食量的影响显著(P<0.05);②随着能量、蛋白质水平的提高,能量、蛋白质的血清代谢产物呈现出升高的趋势,但差异不显著(P>0.05),随着钙、磷水平升高,血清钙、磷的含量升高,不同磷水平对血清磷影响差异极显著(P<0.01)。新美系杜洛克在育肥期适宜的能量、蛋白质、钙和磷水平分别为14.2 MJ/kg、18.6%、1.25%和0.73%。

The experiments were conducted to study the effects of dietary energy（DE） and crude protein（CP） and calcium（Ca） and phosphorus（P） on growth performance and serum biochemical indices of the four nutrients in 70 to 90 kg newly imported Duroc from USA.The orthogonal 4×3 factorial trial was used and 9 kind of diets were designed to determine the requirements of dietary metabolizable energy and crude protein and calcium and phosphorus of newly imported Duroc from USA.The results showed that,①the energy,crude protein,calcium level cannot significantly（P〉0.05） effect in the growth performance,the phosphorus level significant（P〈0.05） effected in daily feed intake;②along the increase of the dietary energy and crude protein level,the metabolic of energy and crude protein increased,but has no significant effect（P〉0.05）,along the increase of the dietary calcium and phosphorus level,the blood calcium and phosphorus increased,the phosphorus level extremely significant（P〈0.01） effected in serum phosphorus.The best nutritive level in Duroc diet can be： digestive energy 14.2 MJ/kg,crude protein 18.6%,calcium 1.25%,phosphorus 0.73%,respectively.