Mateo R D, Spallholz J E, Elder R, Yoon I, Kim S W
Texas Tech University, Lubbock, TX 79409, USA.
J Anim Sci. 2007 May;85(5):1177-83. doi: 10.2527/jas.2006-067. Epub 2007 Jan 30.
A study was conducted to determine the efficacy of organic (Se-yeast, SelenoSource AF, Diamond V Mills Inc., Cedar Rapids, IA) and inorganic sources of Se on growth performance, tissue Se accretion, and carcass characteristics of growing-finishing pigs fed diets with high endogenous Se content. A total of 180 pigs at 34.4 +/- 0.06 kg of BW were allotted to 1 of 5 dietary treatments: a negative control without added Se (NC); 3 treatment diets with 0.1, 0.2, or 0.3 mg/kg of added Se from an organic source; and a diet with 0.3 mg/kg of added Se as sodium selenite. Each treatment had 6 pens, with 6 pigs per pen-replicate. Experimental diets were changed twice at 66.1 +/- 0.5 kg and 99.0 +/- 0.9 kg of BW, and were fed until the pigs reached market weight. Growth performance was measured at the end of each phase. Upon reaching 129.9 +/- 1.4 kg of BW, the pigs were transported to a local abattoir (Seaboard Foods, Guymon, OK), where carcass, loin, and liver samples were obtained. Hair and blood samples were obtained at the beginning and end of the study for Se analysis. Growth performance did not differ (P > 0.05) among treatments. Percent drip loss of the NC pigs was greater (2.41 vs. 1.75, P = 0.011) compared with pigs supplemented with Se. Pigs fed diets with added Se had greater Se concentrations in the liver (0.397 vs. 0.323 ppm, P = 0.015), loin (0.236 vs. 0.132 ppm, P < 0.001), serum (0.087 vs. 0.062 ppm, P = 0.047), and hair (0.377 vs. 0.247 ppm, P = 0.003) compared with the NC pigs. Percentage drip loss was linearly reduced [percent drip loss = 2.305 - (2.398 x Se), r2 = 0.29, P = 0.007] as dietary organic Se concentration increased. The Se concentration (ppm) in the liver [liver Se = 0.323 + (0.291 x Se), r2 = 0.33, P = 0.003], loin [loin Se = 0.122 + (0.511 x Se), r2 = 0.57, P < 0.001], serum [serum Se = 0.060 + (0.113 x Se), r2 = 0.33, P = 0.004] and hair [hair Se = 0.237 + (0.638 x Se), r2 = 0.56, P < 0.001] increased linearly as dietary organic Se concentration increased. Slope ratio analysis indicated that the relative bioavailability of organic Se for percent drip loss and loin and hair Se response was 306, 192, and 197% of that for inorganic Se, respectively. The results of the study show a potential advantage of organic Se supplementation in reducing drip loss even when the basal diet contains an endogenously high Se concentration of 0.181 ppm.
进行了一项研究，以确定有机硒（硒酵母，SelenoSource AF，钻石V磨坊公司，锡达拉皮兹，爱荷华州）和无机硒源对生长育肥猪生长性能、组织硒沉积和胴体特性的影响，这些猪饲喂的日粮内源性硒含量较高。总共180头体重34.4±0.06千克的猪被分配到5种日粮处理中的1种：不添加硒的阴性对照（NC）；3种添加0.1、0.2或0.3毫克/千克有机硒源的处理日粮；以及一种添加0.3毫克/千克亚硒酸钠的日粮。每个处理有6个栏，每个栏重复6头猪。实验日粮在体重66.1±0.5千克和99.0±0.9千克时更换两次，并一直饲喂到猪达到上市体重。在每个阶段结束时测量生长性能。当体重达到129.9±1.4千克时，将猪运至当地屠宰场（海滨食品公司，盖蒙，俄克拉荷马州），在那里采集胴体、腰肉和肝脏样本。在研究开始和结束时采集毛发和血液样本进行硒分析。各处理间生长性能无差异（P>0.05）。与补充硒的猪相比，NC组猪的滴水损失百分比更高（2.41对1.75，P = 0.011）。与NC组猪相比，饲喂添加硒日粮的猪肝脏（0.397对0.323 ppm，P = 0.015）、腰肉（0.236对0.132 ppm，P<0.001）、血清（0.087对0.062 ppm，P = 0.047）和毛发（0.377对0.247 ppm，P = 0.003）中的硒浓度更高。随着日粮有机硒浓度的增加，滴水损失百分比呈线性降低[滴水损失百分比=2.305 -（2.398×硒），r2 = 0.29，P = 0.007]。肝脏[肝脏硒=0.323 +（0.291×硒），r2 = 0.33，P = 0.003]、腰肉[腰肉硒=0.122 +（0.511×硒），r2 = 0.57，P<0.001]、血清[血清硒=0.060 +（0.113×硒），r2 = 0.33，P = 0.004]和毛发[毛发硒=0.237 +（0.638×硒），r2 = 0.56，P<0.001]中的硒浓度随着日粮有机硒浓度的增加呈线性增加。斜率比分析表明，有机硒对滴水损失百分比以及腰肉和毛发硒反应的相对生物利用率分别是无机硒的306%、192%和197%。研究结果表明，即使基础日粮内源性硒浓度高达0.181 ppm，补充有机硒在减少滴水损失方面仍具有潜在优势。
