Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-26 Cooperative journals: 《广西植物》
Abstract： In order to select superior clones with strong resin-producing capacity and high resin-quality from the existing fast-growing timber clones in seed orchard of Pinus elliottii, and to make high use of crop germplasm resource,36 clones in the first generation of slash pine seed orchard were used as materials to determine their resin yield, resin mass flow rate and DBH growth, and to analyze their resin composition by GC-MS. Based on the above indicators, correlation analysis and cluster analysis was used to comprehensively evaluate the production and quality of resin among 36 clones. The results were as follows: (1) There were a total of 21 pine resin components, including 8 monoterpenes and 13 diterpenes. (2) Correlation analysis showed that the resin mass flow rate (RMR) had significant and positive correlation with the total content of monoterpene, weakly negatively correlates to abietic-type resin acid, and not significantly correlated to pimaric-type resin acid. (3) Based on the cluster analysis results integrating four types of indicators as the total monoterpene content, resin mass flow rate, abietic-type resin acid and pimaric-type resin acid, 36 clones could be divided into three categories and the difference between each type is significant. The performance of Class 1 was much better than that of the other two categories. (4) There were 17 high-resin yield pine clones (ERM≥15.15) among 36 clones, and on the basis of this, four clones (6-44, 4-11-1, 1-38 and 3-64) display higher monoterpenes content, while four clones (4-11-1, 3-64, 2-0420, 3-468) showed higher contents of pimaric-type resin acid. And the content of abietic-type resin acid of clone 2-173 was the highest. In summary, a total of 21 pine resin components of P. elliottii were identified, and 36 clones were evaluated based on four indicators: the total monoterpene content, resin mass flow rate, abietic-type resin acid and pimaric-type resin acid. We not only analyzed qualitatively the resin composition but also evaluated quantitatively the resin-producing capacity of 36 clones in slash pine seed orchard. Our findings provide the scientific references for the targeted breeding of pine resin components and lay a foundation for subsequent heredity breeding and gene improvement of P. elliottii.
Subjects: Biology >> Zoology submitted time 2018-12-25 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究饲粮钠水平对肉仔鸡生长性能、血液离子浓度以及血常规、血气和胫骨指标的影响。选取1日龄爱拔益加（AA）肉仔鸡公雏270只，随机分为3组（每组6个重复，每个重复15只鸡），分别饲喂氯满足需要但钠水平为0.075%（低钠组）、0.160%（中钠组）和0.245%（高钠组）的饲粮。试验期42 d，分为前期（1～14日龄）、中期（15～28日龄）和后期（29～42日龄）3个阶段。结果显示：1）随着饲粮钠水平的升高，肉仔鸡14和28日龄平均体重显著增加（P0.05）。高钠组42日龄血液血红蛋白浓度显著高于低钠组（P0.05）。5）低钠组肉仔鸡42日龄胫骨重量和长度均显著低于中钠组和高钠组（P<0.05）。由此可见，饲粮钠水平为0.075%时会降低肉仔鸡的采食量，对胫骨发育和生长不利；较高的饲粮钠水平（0.245%）可改善肉仔鸡的生长性能，且在前期效果较好。
Subjects: Biology >> Zoology submitted time 2017-10-23 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究代乳品和开口料的饲喂对哺乳中后期羔羊生长性能、血清生化指标和营养物质表观消化率的影响。选择体重相近的30日龄羔羊75只，随机分成5组，每组3个重复，每个重复5只。各组分别饲喂代乳品1+开口料（A组）、代乳品1（B组）、代乳品2（C组）、母乳+开口料（D组）和母乳（E组）。分别在30、40、50、60、70日龄称重并对体尺进行测量，68~70日龄连续收集3 d粪样测定营养物质表观消化率，在70日龄颈静脉采血测定血清生化指标。结果表明：1）30、40、50、60、70日龄D组体重、体长、体高、胸围高于A、E组，E组高于B组，B组与C组间差异不显著（P﹥0.05）；但60～70日龄期间，A组平均日增重显著高于D组（P﹤0.05），B组显著高于E组（P﹤0.05）。2）血清尿素氮含量及谷丙转氨酶、谷氨酰转移酶、乳酸脱氢酶活性组间差异不显著（P﹥0.05）；血清总蛋白和甘油三酯含量D组显著高于A组（P﹤0.05），E组甘油三酯含量显著高于B、C组（P﹤0.05）；血清白蛋白和球蛋白含量A、D、E组之间差异不显著（P﹥0.05），但D组有增高趋势，E组显著高于B、C组（P﹤0.05）；血清葡萄糖含量A、D、E组显著高于B、C组（P﹤0.05）；A组血清碱性磷酸酶活性显著高于其他各组（P﹤0.05）；B、C组之间上述血清生化指标差异均不显著（P﹥0.05）。3）各营养物质采食量A组显著高于B、C组（P﹤0.05），B、C组之间差异不显著（P﹥0.05）;干物质、钙、磷表观消化率差异不显著（P﹥0.05）;粗蛋白质、总能、中性洗涤纤维和酸性洗涤纤维表观消化率A组显著高于B、C组（P﹤0.05），且B、C组差异不显著（P﹥0.05）。由此可见，代乳品和开口料的饲喂对羔羊生长性能、血清生化指标及营养物质表观消化率有不同程度的影响，羔羊代乳品加开口料的饲喂模式可实现羔羊的早期断奶，具有一定的推广价值。
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