Safaei Amir Reza, Rouzbehan Yousef, Aghaalikhani Majid
Department of Animal Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Agronomy Department, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Transl Anim Sci. 2022 Jul 23;6(3):txac100. doi: 10.1093/tas/txac100. eCollection 2022 Jul.
The nutritive quality of four cultivars of canola forage ( L.), Orient, Midas, Global, and Hybrid (Cobra × Regent), which were harvested in the early-spring period, were compared with green-winter barley (GWB) in terms of their yields, chemical composition, in vitro gas production variables, in situ crude protein (CP) degradation, and predicted dry matter intake (PDMI). Data were statistically analyzed using a completely randomized design with four replications and three samples per replication. The study was based on a randomized complete block design, and data were analyzed using SAS, general linear model procedure for normal distribution. The canola dry matter (DM) yield was highest in Orient cultivar and lowest in Midas ( < 0.05). Organic matter (OM), CP, neutral detergent fiber (NDF), and lignin(sa) concentration of the four cultivars ranged from 862 to 865, 218 to 247, 295 to 340, and 35 to 53 g/kg DM, respectively. The estimated OM disappearance (OMD), effective degradability of CP, effective rumen degradable protein (ERDP), digestible undegradable protein, and metabolizable protein (MP) of the forages were from 636 to 671 g/kg, 878 to 910, 172 to 193, 1.9 to 3.4, and 112 to 126 g/kg DM, respectively. Compared to Global and Hybrid cultivars, Orient and Midas contained higher CP, OMD, ERDP, MP concentration, and PDMI, but lower NDF, acid detergent fiber (ADF), and lignin(sa) concentrations ( < 0.05). The level of glucosinolates in the forages ranged from 0.38 to 1.51 µmol/g DM, which is below the detrimental level for ruminants. Compared to winter canola cultivars, GWB had higher DM yield ( < 0.003), NDF, lignin(sa), PDMI ( < 0.01), and digestible undegradable protein ( < 0.04), but had lower OMD ( < 0.03), ERDP ( = 0.01), and MP ( < 0.009). Based on the obtained results, the variation in the nutritive quality among the canola cultivars is relatively small, and the Orient cultivar, which is most comparable to GWB, was judged to be nutritionally the best among the cultivars.
对早春收获的4个油菜饲用品种（甘蓝型油菜），即Orient、Midas、Global和杂交品种（Cobra×Regent）的营养品质，与冬性大麦（GWB）在产量、化学成分、体外产气变量、原位粗蛋白（CP）降解及预测干物质采食量（PDMI）方面进行了比较。数据采用完全随机设计进行统计分析，有4次重复，每次重复3个样本。该研究基于随机完全区组设计，数据使用SAS的一般线性模型程序进行正态分布分析。油菜干物质（DM）产量在Orient品种中最高，在Midas品种中最低（P<0.05）。4个品种的有机物（OM）、CP、中性洗涤纤维（NDF）和酸性洗涤木质素（lignin(sa)）浓度分别为862～865、218～247、295～340和35～53 g/kg DM。饲草的估计OM消失量（OMD）、CP有效降解率、有效瘤胃可降解蛋白（ERDP）、可消化不可降解蛋白和代谢蛋白（MP）分别为636～671 g/kg、878～910、172～193、1.9～3.4和112～126 g/kg DM。与Global和杂交品种相比，Orient和Midas含有较高的CP、OMD、ERDP、MP浓度和PDMI，但NDF、酸性洗涤纤维（ADF）和lignin(sa)浓度较低（P<0.05）。饲草中硫代葡萄糖苷水平为0.38～1.51 μmol/g DM，低于对反刍动物有害的水平。与冬油菜品种相比，GWB的DM产量较高（P<0.003）、NDF、lignin(sa)、PDMI（P<0.01）和可消化不可降解蛋白（P<0.04）较高，但OMD（P<0.03）、ERDP（P = 0.01）和MP（P<0.009）较低。基于所得结果，油菜品种间营养品质的差异相对较小，与GWB最具可比性的Orient品种被判定为各品种中营养最佳的品种。
