UTILIZATION OF AN ENZYME COMPLEX IN DIETS CONTAINING COTTONSEED CAKE FOR GROWING PIGS

Abstract Two experiments were conducted with pigs in the growth phase (30–50 kg). Experiment I consisted of a digestibility trial to determine the nutritional value of cottonseed cake with and without addition of an enzyme complex through the method of total collection of excreta. Twenty barrows were used and housed in metabolic cages to collect the total collection of feces and urine. Four treatments and five replications randomized the experimental design completely. Two reference diets and two test diets were experimental (70% reference diet and 30% cottonseed cake), with and without the addition of an enzyme complex. The evaluated variables were: apparent digestibility coefficient of dry matter, of crude protein, of Gross energy, of phosphorus and the values of digestible dry matter, digestible protein, digestible phosphorus, digestible energy and metabolizable energy of cottonseed cake with and without enzymes. The addition of enzymes increased the levels of digestible protein to 0.302–0.313 kg/kg and digestible energy to 2,538–2,894 kcal/kg. Experiment II was conducted to assess barrow performance when they were fed diets containing increasing levels of cottonseed cake protein (0, 20, 40 and 60%), which replaced protein from soybean meal, with the enzyme complex. The design was a randomized block design consisting of four treatments and five replications. The performance, carcass characteristics and biochemical parameters of the blood were evaluated. These results indicate that the protein from soybean meal can be replaced up to 60% by the cottonseed cake protein with enzyme complex in diets for pigs in the growth phase, without sacrificing performance or carcass characteristics

摘要
本研究针对体重30~50 kg的生长阶段猪只开展两项试验。
试验一采用全收粪尿法开展消化试验，以测定添加与未添加酶复合物（enzyme complex）的棉籽饼的营养价值。试验选用20头去势公猪，饲养于代谢笼中收集全部粪便与尿液。试验采用完全随机设计，设置4个处理组，每组5个重复。试验日粮包含2种基础日粮与2种试验日粮：试验日粮由70%基础日粮与30%棉籽饼组成，分别添加与未添加酶复合物。本试验测定的指标包括：添加与未添加酶复合物的棉籽饼的干物质、粗蛋白、总能、磷的表观消化率，以及干物质消化量、可消化粗蛋白、可消化磷、消化能与代谢能数值。结果显示，添加酶复合物可使可消化粗蛋白水平提升至0.302~0.313 kg/kg，消化能水平提升至2538~2894 kcal/kg。
试验二旨在评估饲喂添加酶复合物且棉籽饼蛋白替代豆粕蛋白水平梯度递增（0、20%、40%、60%）的日粮时，去势公猪的生长性能。试验采用随机区组设计，设置4个处理组，每组5个重复。测定指标包括生长性能、胴体特性以及血液生化参数。本试验结果表明，在生长阶段猪的日粮中，使用添加酶复合物的棉籽饼蛋白可替代高达60%的豆粕蛋白，且不会对猪只生长性能与胴体品质造成负面影响。