摘要
Brassica carinatais a new oilseed crop in Florida with the potential of producing high-quality biodiesel for use as jet biofuel. A high-protein meal (∼40% CP) is obtained as a byproduct of oil extraction; however, this meal has not been tested as a potential protein supplement for cattle. A duplicated 4 × 4 Latin square design was used to determine the effects of supplementation withB. carinatameal on ruminal fermentation, digestibility, and blood profile in beef cattle consuming bahiagrass hay (Paspalum notatum), compared with frequently used protein supplements. Eight Angus crossbred steers (473 ± 119 kg initial BW) were randomly allocated to 8 pens, over 4 periods of 28 d each. Within period, steers were assigned to one of four treatments: 1.62 kg/d cottonseed meal (CSM), 2.15 kg/d dry distillers grains with solubles (DDGS), 1.39 kg/dB. carinatameal pellets (BCM), or 1.17 kg/d soybean meal (SBM), supplemented daily, on an isonitrogenous basis. Steers had ad libitum access to bahiagrass hay and water. Intake was measured using the GrowSafe system. Following a 14 d adaptation, feed and fecal samples were collected twice daily for 4 d to determine apparent total tract nutrient digestibility using iNDF as an internal marker. Blood and ruminal fluid samples were collected every 3 h, during a 24 h period, to analyze blood urea nitrogen (BUN) and glucose in plasma, as well as pH, NH3-N, and VFA concentrations in ruminal fluid. Data were analyzed using PROC MIXED of SAS with repeated measures. Model included the fixed effects of treatment, time, treatment × time, square, and period, and the random effects of steer (square) and steer (treatment). No effect of treatment (P>0.05) was observed for pH, NH3-N, or glucose concentration. An effect of treatment (P<0.01) was observed for BUN, with steers receiving SBM having greater concentrations. There was no effect of treatment (P>0.05) on total VFA concentrations. Steers consuming CSM had greatest acetate molar proportion, and greater acetate to propionate ratio when compared with DDGS and BCM. Steers consuming DDGS had greatest molar proportions of butyrate and greater molar proportions of propionate compared with SBM and CSM. There was no effect of treatment (P>0.05) on DMI or apparent total tract digestibility of DM, OM, CP, NDF, or ADF.Brassica carinataperformed similarly to commonly used protein supplements, excluding VFA profile, indicating its viability as a protein supplement for beef cattle.
摘要译文
芸薹属（Brassica carinatais）是佛罗里达州一种新的油籽作物，具有生产高质量生物柴油的潜力，可用作喷气式生物燃料。获得高蛋白粉（约40％CP）作为油提取的副产物;然而，这顿饭还没有作为牛的潜在蛋白质补充剂进行测试。使用重复的4×4拉丁方设计来确定补充B的效果。 carinatameal对瘤胃发酵，消化率，以及与经常使用的蛋白质补充剂相比，食用巴西草干草（Paspalum notatum）的肉牛血液特征。将8只安格斯杂交阉牛（473±119 kg初始体重）随机分配到8个围栏，超过4个周期，每个28天。在一段时期内，阉牛被分配到四种处理之一：1。62 kg / d棉籽粕（CSM），2.15 kg / d干酒糟和可溶物（DDGS），1.39 kg / dB。 （BCM）或1.17kg / d豆粕（SBM），每天补充，在等氮的基础上。阉牛可随意获取巴西草草干草和水。使用GrowSafe系统测量摄入量。经过14天的改编，每天两次收集饲料和粪便样品，持续4天，以使用iNDF作为内部标记物确定表观总肠道营养物消化率。在24小时期间每3小时收集血液和瘤胃液样品以分析血浆中的血液尿素氮（BUN）和葡萄糖以及pH，NH 3 -N，和瘤胃液中的VFA浓度。使用SAS的PROC MIXED分析数据并重复测量。模型包括治疗的固定效果，时间，治疗×时间，平方和周期，和Steer（方形）和Steer（治疗）的随机效应。对pH，NH 3 -N或葡萄糖浓度没有观察到处理效果（P 0.05）。治疗效果（P 0。01）观察到BUN，接受SBM的阉牛具有更高的浓度。对总VFA浓度没有影响（P 0.05）。与DDGS和BCM相比，消耗CSM的阉牛具有最大的乙酸盐摩尔比例和更高的乙酸盐与丙酸盐比率。与SBM和CSM相比，使用DDGS的阉牛的丁酸盐摩尔比例和丙酸盐的摩尔比例更大。治疗无效（P 0）。[05]关于DM，OM，CP，NDF或ADF的DMI或表观总肠道消化率.Brassica carinata与常用蛋白质补充剂相似，不包括VFA谱，]表明它作为肉牛蛋白质补充剂的可行性。
T. M. Schulmeister;M. Ruiz-Moreno;G. M. Silva;M. E. Garcia-Ascolani;F. M. Ciriaco;D. D. Henry;G. C. Lamb;J. C. B. Dubeux, Jr.;N. DiLorenzo. 539 Evaluation ofBrassica carinatameal on ruminal metabolism and nutrient digestibility of beef cattle[J]. Journal of Animal Science, 2017,95(Sup4): 264