Six rumen-cannulated Nellore steers (407 ± 24 kg initial body weight) were used in a 6 × 6 Latin square design experiment to evaluate the effects of soybean oil (SO) or various levels of whole cottonseed (WC) in finishing diets. Treatments consisted of five levels [0, 8, 16, 24, and 32% of dry matter (DM) basis] of WC in diets containing 80% concentrate and one diet formulated to contain a similar concentration of lipid (DM basis) as diet WC32 but without WC, rather using SO. Increasing levels of WC decreased the intake of DM, non-fibrous carbohydrate, and total digestible nutrients (linear; P ≤ 0.01), tended to decrease the intake of crude protein (linear; P = 0.10), but didn't affect the intake of neutral detergent fiber (P = 0.12). The intake of total fatty acids increased (linear; P < 0.01) due to the increasing levels of WC. The inclusion of SO also increased the intake of total fatty acids (P < 0.01) but did not affect (P ≥ 0.20) the intake of DM, crude protein and neutral detergent fiber compared with WC0. Increasing levels of WC decreased the total volatile fatty acids concentration (linear; P < 0.001). Feeding SO reduced the total protozoa account (P < 0.001) compared with WC0. Feeding SO did not affect the intake, nutrient digestibility, and the main ruminal characteristics compared with the control diet, therefore no positive effects of increasing dietary fat content from 3.2 to 7.8% with soybean soil on growth performance would be expected. The DM intake was dramatically decreased in response to the levels of WC, as well as the ruminal fermentation characteristics.

在一个6×6的拉丁方设计实验中，使用了6个瘤胃空心Nellore牛（初始体重407±24千克）来评估大豆油（SO）或各种水平的全棉籽（WC）在最终饮食中的影响。在包含80％浓缩物的日粮中配制了WC的五种水平[以干物质（DM）为基础的0、8、16、24和32％]，其中一种饮食中的脂质含量与日粮类似（以DM为基础） WC32，但没有WC，而是使用SO。增加WC的水平降低DM，非纤维碳水化合物和总的可消化营养素（线性;的吸入P ≤0.01），倾向于降低粗蛋白质的摄入（线性; P  = 0.10），但不影响进中性清洁剂纤维（P = 0.12）。由于WC含量的增加，总脂肪酸的摄入量增加（线性；P <0.01）。的SO列入也增加了总脂肪酸摄入（P <0.01），但没有影响（P ≥0.20）与比较WC0 DM，粗蛋白和中性洗涤纤维的摄入量。WC水平的增加降低了总挥发性脂肪酸的浓度（线性；P <0.001）。饲喂SO减少了原生动物的总数（P<0.001），而WC0。与对照日粮相比，饲喂SO不会影响采食量，养分消化率和主要瘤胃特性，因此，大豆土壤日粮脂肪含量从3.2增加到7.8％不会对生长性能产生积极影响。DM摄入量因WC水平以及瘤胃发酵特性而急剧下降。