Chiba L I, Peo E R, Lewis A J, Brumm M C, Fritschen R D, Crenshaw J D
J Anim Sci. 1985 Oct;61(4):763-81. doi: 10.2527/jas1985.614763x.
Four trials were conducted with 1,480 pigs (initial wt: 23 kg in trial 1,29 kg in trial 2 and 49 kg in trial 3 and 4) to determine the effect of dietary fat on pig performance, nutrient separation in an automated feed distribution system, dust levels in swine buildings and integrity of the respiratory system of swine. Two modified-open-front (B-1 and B-2) and two environmentally regulated (E-1 and E-2) growing-finishing buildings, of identical design, were used in each trial. In trial 1, 250 pigs (25 pens of 10 pigs/pen) in B-1 were fed a ground, mixed, corn-soybean meal diet (15% crude protein) with added tallow (5%), and 250 pigs in B-2 were fed the same diet but without added tallow. The assignment of diets to buildings were reversed in trial 2 in which 2.5% tallow was used instead of 5%. Each diet was fed ad libitum to pigs, and was distributed by an automated "Flexauger" system in trials 1 and 2. In each of trials 3 and 4, 120 pigs (12 pens of 10 10 pigs/pen) in E-1 were fed a corn-soybean meal diet (14% crude protein) with added tallow (5%) and 120 pigs in E-2 were fed the same diet but without added tallow. Overall, pigs fed the diet with tallow gained faster (P less than .002), consumed less feed (P less than .02) and converted feed more efficiently (P less than .002) than those fed the diet without tallow in trials 1 and 2. Pig performance was also improved by the addition of tallow to the diet in trials 3 and 4 (P less than .002). Crude protein, Ca, P and Cu contents of both diets were similar at each location sampled throughout the automated distribution system in trials 1 and 2. Addition of tallow to the diets reduced aerial dust levels, both with the feed distribution auger running (P less than .002) and without the auger running (P = .06) in trials 1 and 2. In trials 3 and 4, adding 5% tallow to the diet reduced aerial dust concentrations of of particle sizes of 14, 4, and 1.5 micron (P less than .002) and .4 micron (P = .07). The amount of settled dust was lower (P less than .001, trials 1, 3 and 4) when tallow was included in the diet.(ABSTRACT TRUNCATED AT 400 WORDS)
进行了四项试验，涉及1480头猪（试验1初始体重23千克，试验2初始体重29千克，试验3和试验4初始体重49千克），以确定日粮脂肪对猪生长性能、自动饲喂系统中养分分离、猪舍内粉尘水平以及猪呼吸系统完整性的影响。每次试验使用了两座设计相同的改良开放式前端猪舍（B - 1和B - 2）以及两座环境可控猪舍（E - 1和E - 2）。在试验1中，B - 1猪舍的250头猪（25栏，每栏10头）饲喂一种经粉碎、混合的玉米 - 豆粕日粮（粗蛋白含量15%），添加了牛脂（5%）；B - 2猪舍的250头猪饲喂相同日粮，但未添加牛脂。试验2中日粮与猪舍的分配进行了对调，且使用2.5%的牛脂代替5%。每次试验中，日粮均让猪自由采食，并在试验1和试验2中通过自动“Flexauger”系统进行分发。在试验3和试验4中，E - 1猪舍的120头猪（12栏，每栏10头）饲喂一种玉米 - 豆粕日粮（粗蛋白含量14%），添加了牛脂（5%）；E - 2猪舍的120头猪饲喂相同日粮，但未添加牛脂。总体而言，在试验1和试验2中，饲喂添加牛脂日粮的猪生长速度更快（P < 0.002），采食量更少（P < 0.02），饲料转化率更高（P < 0.002）。试验3和试验4中，日粮添加牛脂也改善了猪的生长性能（P < 0.002）。在试验1和试验2中，整个自动分发系统的各个采样点，两种日粮的粗蛋白、钙、磷和铜含量相似。试验1和试验2中，日粮添加牛脂降低了空气中的粉尘水平，无论是在饲料分发螺旋输送机运行时（P < 0.002）还是未运行时（P = 0.06）。在试验3和试验4中，日粮添加5%牛脂降低了粒径为14、4和1.5微米（P < 0.002）以及0.4微米（P = 0.07）的空气中粉尘浓度。日粮中包含牛脂时，沉降粉尘量更低（试验1、3和4，P < 0.001）。（摘要截断于400字）
