Crane A R, Redden R R, Swanson K C, Howard B M, Frick T J, Maddock-Carlin K R, Schauer C S
J Anim Sci. 2017 Jul;95(7):3198-3205. doi: 10.2527/jas.2017.1369.
Our hypothesis was that increasing the inclusion level of dried distiller's grains with solubles (DDGS) to feedlot lambs would increase growth and the inclusion of lasalocid (LAS; Bovatec, Alpharma, LLC, Bridgewater, NJ) would increase ADG and G:F, while not affecting digestibility, ruminal VFA concentration, and ruminal pH. Furthermore, we hypothesized that rations containing LAS and higher levels of DDGS would cause increased ruminal hydrogen sulfide gas (HS) concentrations. Two hundred forty crossbred (Suffolk × Rambouillet) lambs (31.9 ± 5.87 kg BW; approximately 90 d of age) were allocated to 6 treatments in a completely randomized design with a 3 × 2 factorial arrangement of treatments. Lambs were placed into 24 feedlot pens (4 pens/treatment; 10 lambs/pen) for a 111 d finishing study. Main effects included concentration of DDGS (0, 15, or 30% DM basis) and inclusion of LAS (0 or 22.05 g/metric ton LAS) resulting in treatments of: 1) 0% DDGS without LAS (0DDGS-NL), 2) 0% DDGS with LAS (0DDGS-L), 3) 15% DDGS without LAS (15DDGS-NL), 4) 15% DDGS with LAS (15DDGS-L), 5) 30% DDGS without LAS (30DDGS-NL), and 6) 30% DDGS with LAS (30DDGS-L). Two-day weights were taken at the beginning and end of the experiment. Two-hundred-eighteen lambs (64.8 ± 7.99 kg BW) were slaughtered on d 112 at a commercial abattoir and carcass data collected. The inclusion of LAS increased ( ≤ 0.02) final BW, ADG, G:F, and HCW. As DDGS in the ration increased to 30%, DMI decreased linearly ( = 0.03) while G:F increased linearly ( = 0.03). A second study was conducted utilizing the same treatments to evaluate N and S balance, ruminal VFA and H2S concentration, and ruminal pH in 24 crossbred wethers (Suffolk × Rambouillet; 41.2 ± 12.23 kg BW). Daily urinary sulfur excretion and ruminal H2S concentration were linearly increased ( < 0.001) as DDGS increased in the ration. Total ruminal VFA concentration linearly decreased ( = 0.002) as DDGS increased in the ration. The inclusion of LAS increased ( = 0.02) ruminal pH. The results confirm our hypothesis that LAS increased overall growth and increasing DDGS increased ruminal HS concentration but did not influence growth. We reject the hypothesis that the combined effects of LAS and DDGS would have no effect on rumen pH and VFA concentrations.
我们的假设是，提高育肥羔羊日粮中可溶物干酒糟（DDGS）的添加水平会促进生长，添加拉沙洛西（LAS；商品名Bovatec，Alpharma公司，新泽西州布里奇沃特）会提高平均日增重（ADG）和料重比（G:F），同时不影响消化率、瘤胃液挥发性脂肪酸（VFA）浓度和瘤胃液pH值。此外，我们假设含有LAS和较高水平DDGS的日粮会导致瘤胃液中硫化氢气体（HS）浓度升高。240只杂交（萨福克×兰布耶）羔羊（体重31.9±5.87千克；约90日龄）按完全随机设计分配到6种处理组，采用3×2析因设计。将羔羊放入24个育肥栏（每个处理4栏；每栏10只羊），进行为期111天的育肥研究。主要因素包括DDGS浓度（干物质基础为0%、15%或30%）和LAS添加量（0或22.05克/公吨LAS），由此产生以下处理：1）不添加LAS的0% DDGS（0DDGS-NL），2）添加LAS的0% DDGS（0DDGS-L），3）不添加LAS的15% DDGS（15DDGS-NL），4）添加LAS的15% DDGS（15DDGS-L），5）不添加LAS的30% DDGS（30DDGS-NL），6）添加LAS的30% DDGS（30DDGS-L）。在实验开始和结束时记录两天的体重。112日龄时，218只羔羊（体重64.8±7.99千克）在一家商业屠宰场屠宰，并收集胴体数据。添加LAS提高了（≤0.02）最终体重、ADG、G:F和热胴体重（HCW）。随着日粮中DDGS增加到30%，干物质采食量（DMI）呈线性下降（P = 0.03），而G:F呈线性增加（P = 0.03）。进行了第二项研究，采用相同的处理方法，评估24只杂交阉羊（萨福克×兰布耶；体重41.2±12.23千克）的氮和硫平衡、瘤胃液VFA和H2S浓度以及瘤胃液pH值。随着日粮中DDGS增加，每日尿硫排泄量和瘤胃液H2S浓度呈线性增加（P < 0.001）。随着日粮中DDGS增加，瘤胃液总VFA浓度呈线性下降（P = 0.002）。添加LAS提高了（P = 0.02）瘤胃液pH值。结果证实了我们的假设，即LAS提高了总体生长性能，增加DDGS提高了瘤胃液HS浓度，但不影响生长。我们拒绝了LAS和DDGS的联合作用对瘤胃pH值和VFA浓度无影响的假设。
