猪生长激素对饲粮赖氨酸和理想氨基酸混合物添加水平应答反应的影响。

Effects of porcine somatotropin administration on the responses to dietary lysine and a near-ideal blend of amino acids for growing pigs.

机构信息

Department of Animal and Food Sciences, University of Kentucky, Lexington, KY 40546, USA.

出版信息

J Anim Sci. 2012 Aug;90(8):2663-70. doi: 10.2527/jas.2011-4780.

DOI:10.2527/jas.2011-4780

Abstract

Two experiments were conducted to assess the effects of porcine ST (pST) on the responses to a near-ideal blend of AA for pigs from 22 to 60 kg BW. Eighty Hampshire × Yorkshire gilts (40 gilts/experiment) were individually penned and assigned to a 4 × 2 factorial arrangement of treatments, consisting of 4 diets with and without pST injection. A fortified corn-soybean meal basal diet was formulated to contain 1.50% total Lys and Thr, Met, and Trp were added to obtain a near-ideal blend of these AA relative to Lys. In 3 additional diets, Lys was reduced to 1.25%, 1.00%, or 0.75% by diluting the basal diet with cornstarch, cellulose, and sand, such that the diets also contained the same ratios of AA. Pigs that received pST were administered a daily intramuscular injection of 2 mg of pST. Data from the 2 experiments were pooled. Administration of pST increased ADG (P < 0.01), G:F (P < 0.01), and LM area (P < 0.01), and decreased ADFI (P < 0.03), last rib backfat (P < 0.01), and 10th rib backfat (P < 0.01). Also, estimated carcass muscle and calculated lean gain increased (P < 0.01) in pST-treated pigs. Administration of pST also increased (P < 0.01) the percentage, total gain and accretion rate of water, protein, and ash in the carcass, and decreased (P < 0.01) the percentage, total gain, and accretion rate of carcass fat. Growth rate, G:F, and carcass traits improved (P < 0.01), percentage of carcass protein and water increased (P < 0.01), and carcass fat percentage decreased (P < 0.01) with increasing dietary Lys. The percentage, total gain, and accretion rate of carcass protein increased to a greater extent in pST-treated pigs than in untreated pigs, resulting in a pST × Lys interaction (P < 0.05). The results indicated that pST improves performance, leanness, and protein accretion in pigs from 22 to 60 kg BW, and that these responses to dietary Lys and a near-ideal blend of AA is greater in growing pigs treated with pST than untreated pigs.

摘要

进行了两项实验，以评估猪 ST（pST）对 22 至 60 公斤体重猪对近乎理想的 AA 混合物的反应的影响。80 头汉普夏 × 约克郡母猪（每个实验 40 头母猪）单独被安置在 4×2 因子处理的安排中，包括 4 种添加和不添加 pST 注射的饮食。配制强化玉米-豆粕基础日粮，使其含有 1.50%的总赖氨酸和苏氨酸，添加蛋氨酸和色氨酸，以获得相对于赖氨酸的近乎理想的 AA 混合物。在另外 3 种日粮中，通过用玉米淀粉、纤维素和沙子稀释基础日粮，将赖氨酸减少到 1.25%、1.00%或 0.75%，使日粮也含有相同比例的 AA。接受 pST 的猪每天接受一次肌肉内注射 2 毫克 pST。将来自这两个实验的数据汇总。pST 的给药增加了 ADG（P<0.01）、G:F（P<0.01）和 LM 面积（P<0.01），减少了 ADFI（P<0.03）、最后肋骨背膘（P<0.01）和第 10 肋骨背膘（P<0.01）。此外，估计的胴体肌肉和计算的瘦肉增加（P<0.01）在 pST 处理的猪中。pST 的给药还增加了（P<0.01）胴体中水分、蛋白质和灰分的百分比、总增益和积累率，并降低了（P<0.01）胴体脂肪的百分比、总增益和积累率。生长速度、G:F 和胴体性状得到改善（P<0.01），胴体蛋白质和水分的百分比增加（P<0.01），胴体脂肪百分比降低（P<0.01），日粮赖氨酸增加。与未处理的猪相比，pST 处理的猪胴体蛋白质的百分比、总增益和积累率增加幅度更大，导致 pST×赖氨酸相互作用（P<0.05）。结果表明，pST 提高了 22 至 60 公斤体重猪的性能、瘦肉率和蛋白质积累，并且在接受 pST 处理的生长猪中，对日粮赖氨酸和近乎理想的 AA 混合物的反应大于未处理的猪。