桂闽引象草的选育研究

桂闽引象草（Pennisetum purpureum Schum.cv.Gui Min Yin）2003年从台湾引进,经过单株筛选,几年的扩繁,筛选出比桂牧1号杂交象草质量更好、产量更高的桂闽引象草新品种.桂闽引象草品种试验产鲜草154 067 kg/hm2,比对照品种桂牧1号杂交象草126 717.4 kg/hm2,提高了21.6％,比华南象草产量109 187.4 kg/hm2提高了43.7％；区域试验、大田生产年产鲜草1.8～2.8万kg/hm2,比桂牧1号杂交象草增产10％～20％；粗蛋白质含量达10.5％,比桂牧1号杂交象草提高11.7％,氨基酸含量达7.89％；2010年通过审定登记为国家牧草品种.     

南方三种暖季型牧草品种的比较研究

对台湾甜象草、桂牧一号杂交象草、皇竹草进行了为期两年的比较试验研究。结果表明,三个牧草品种均能适应试验环境条件。甜象草、桂草、皇竹草的鲜草年产量分别为220.85t/hm2,163.18t/hm2,186.20t/hm2;粗蛋白含量分别为17.39%,19.02%,20.91%,粗脂肪含量分别为6.37%,5.39%,4.69%;粗纤维含量分别为33.49%,32.22%,33.58%。台湾甜象草较耐寒,越冬后恢复生长快,抗性较强,试验期间未发现病虫害,是一种高产优质的牧草,值得推广应用。     

能源用草本植物筛选区域性试验研究

2009～2011年在广西南宁市、凌云县、天等县、恭城县、浦北县5个不同生态区,对能源用草本植物桂闽引象草、紫色象草、桂牧1号杂交象草、王草以及野生禾本科斑茅——GM008号斑茅和GM003号斑茅6个品种进行了区域筛选试验研究.结果表明：6种能源草本植物均具有较强的适应性,生长速度快,桂闽引象草、桂牧1号杂交象草干物质产量高,分别为62 972.42、59 811.82 kg/hm2,野生能源草GM008号斑茅经过人工驯化干物质含量为18 913.96 kg/hm2.桂闽引象草、桂牧1号杂交象草具有较高的纤维素含量及能量热值,是适应性极强、生物产量大的优质能源草本植物,具有极大的应用推广前景.     

桂牧1号杂交象草对乳牛产奶量的影响

将10头黑白花奶牛随机分为2组,进行了桂牧1号杂交象草的评价试验.结果表明:试验组平均日产鲜奶量比对照组增加0.83 kg/头,提高3.13%,可产生明显的经济效益.     

氮磷钾配施对田周地种植桂牧1号杂交象草产量及效益的影响

通过不同的施肥处理方案研究在田周地种植桂牧1号杂交象草Pennisetum purpureum cv.Guimu 1的氮、磷、钾需要量及其最佳配比模式。结果表明,在田周地种植桂牧1号杂交象草,通过合理的氮、磷、钾配方施肥,能够达到良好的生产效果与效益。实测结果以N2P2K2（氮肥414 kg/hm2,磷肥138 kg/hm2,钾肥276 kg/hm2)试验组的产量最高[（256.81±1.18）t/hm2],与其他低水平试验组差异均达到极显著水平(P<0.01);与无肥处理相比,增产率达到16.6%。通过对各处理进行效应模型的配置与分析,得出田周地种植桂牧1号杂交象草的预测最高产量为259 t/hm2,对应施肥量为氮肥414621 kg/hm2、磷肥140 kg/hm2、钾肥204 kg/hm2;预测最佳经济产量为256 t/hm2,对应施肥量为氮肥414 kg/hm2、磷肥140 kg/hm2、钾肥172 kg/hm2。     

桂牧1号象草亩产3万kg高产栽培技术

<正>桂牧1号象草属C4作物,具高光能利用率,光合作用效率高,具有显著的高产优势和潜力。为充分挖掘桂牧1号象草生产的优势和潜力,江西省畜牧技术推广站组织开展"桂牧1号象草亩产3万kg高产栽培技术集成研究",历经2年试验研究,取得较好成果,并结合推广生产实践,总结集成了桂牧1号象草获得亩产3万kg模式化栽培配套技术。1桂牧1号象草特征特性     

台湾象草引种研究

对2003年从台湾引进的台湾象草（Pennisetum purpureum cv.Guiminying）进行了品种比较试验、区域试验以及生产试验。结果表明,台湾象草适应性广泛,抗寒,产草量高,年干草产量35.75 t·hm-2,比桂牧1号杂交象草[(P.purpureum cv.Mott）×(P.americanum×P.purureum) cv.Guimu No.1]（26.76 t·hm-2）、华南象草（P.purpureum cv.Huanan）（23.34 t·hm-2）分别提高了33.59%和53.19%。此外,台湾象草再生性好,蛋白质含量高,达10.5%,氨基酸总量达7.89%,具有较高的营养价值,有望成为亚热带地区优良牧草品种。     

氮肥、刈割强度对桂牧1号杂交象草光合特性的影响

采用两因素的随机区组设计,研究了氮肥(250 kg/hm²、不施氮肥)、不同刈割强度(即刈割时离地面5,20和50 cm)对桂牧1号杂交象草光合特性的影响。结果表明,6个处理叶片净光合速率日变化曲线均为双峰曲线,但随着刈割强度的增加,光合速率先升高后降低,且在施氮肥的情况下,光合“午休”明显减弱。施氮肥能显著增加桂牧1号杂交象草的叶绿素含量和最大净光合速率。在施加氮肥的情况下,随着刈割强度的增加,叶片表观量子效率有增加的趋势,羧化效率先增大后降低,光补偿点、光呼吸速率和暗呼吸速率则呈现相反的变化趋势;而在不施氮肥的情况下,随着刈割强度增加,表观量子效率、光补偿点、羧化效率、光呼吸速率和暗呼吸速率均呈现先减少后增加的趋势。这些试验结果表明,氮肥、刈割强度均对桂牧1号杂交象草光合特性产生了一定的影响,在中强度刈割条件下,对桂牧1号施用250 kg/hm²氮肥,可以显著提高其光合能力。     

桉树与牧草套种试验研究

为了探讨桉树-牧草复合种植模式的可行性和桉树是否影响牧草的营养成分,试验于2013—2014年在不同郁闭度的桉树林下套种桂牧1号杂交象草、山毛豆、圆叶舞草、非洲狗尾草、合萌、白花扁豆、速生槐等7种牧草,共设计了13种桉-草复合种植模式。结果表明:在不同郁闭度的桉树林下,桂牧1号杂交象草鲜草产量最高的套种模式是新造林(2 m×6 m),达232.35 t/hm2;其次是新造林(2 m×3 m)、萌芽林(2 m×4 m)、萌芽林(2 m×3 m);山毛豆鲜草产量最高的套种模式是新造林(2 m×6 m),达89.0 t/hm2,新造林与萌芽林间产量相比差异显著(P0.05);在相同郁闭度桉树萌芽林(2 m×3 m)下套种牧草鲜草,再生性最好、生物产量最高的是桂牧1号杂交象草(115.79 t/hm2),其次是非洲狗尾草(94.27 t/hm2),山毛豆(62.53 t/hm2)居第三,圆叶舞草(43.36 t/hm2)居第四。桂牧1号杂交象草、山毛豆等牧草品种在桉树下套种与常规土壤种植的粗蛋白质、粗脂肪、无氮浸出物、钙、磷和氨基酸含量均差异不显著(P0.05)。说明桂牧1号杂交象草、非洲狗尾草、山毛豆、圆叶舞草4个牧草品种适合在桉树下套种生长,而且桉树对牧草营养价值的影响不明显。     

三种牧草在桉树林下间种两年的试验报告

本试验采用山毛豆、184柱花草和桂牧1号杂交象草在桉树林下间种,间种方式有两种：一是桉树株行距为3m×2m,行间间种牧草;二是桉树株行距为6m×2m,行间间种牧草,设不间种为对照。目的是筛选出适宜在桉树林下间种的牧草品种,拟解决桉树人工林生态环境问题。经二年试种、观察、测定结果,山毛豆、184柱花草和桂牧1号杂交象草在...     

Analysis of growth curves of fowl. I. Chickens.

1. The Richards function was used to describe the growth curves (n = 989) of 9 broiler lines. Chickens were fed ad libitum and body weight was recorded every second week from hatching to 26 weeks of age. 2. The accuracy of curve fit measured by the coefficient of determination (R2) was better for males than for females (0.9986-0.9995 vs 0.9972-0.9988, respectively). 3. The estimation of the asymptotic final weight (A) for different lines enabled the degree of maturity (ut = yt/A) to be determined at any fixed point of the curve. At the age of 7 weeks this had a value of 0.318-0.369 for cockerels and 0.325-0.377 for pullets and represented the slaughter maturity of individual lines. The ratio of inflection/asymptotic weight (y+/A = 0.370-0.388) indicated that in some cases chicken growth can be described approximately by the Gompertz function (y+/A = 0.368). 4. It was found that the age at the inflection point of curves (t+ 48.2-55.7 d for cockerels and t+ = 47.8-52.8 d for pullets) roughly corresponds to the slaughter age of the chickens. 5. The interline differences in the parameters of maturation rate for weight (y+/A, k, t+, u7) are low in comparison with the differences in body weight (A, y+, y7) and absolute growth rate (v, v+). 6. The intragroup phenotypic correlation among growth parameters and the importance of the mathematical models are discussed.     

Analysis of growth curves of fowl. II. Ducks.

1. Growth curves of nine selected lines and one random-bred control population (in total, n = 1070) were evaluated by the Richards function. The ducks were weighed at 7-d intervals and, after the tenth week, every second week (up to 18 weeks). Food and water were supplied ad libitum. 2. The predicted curves closely fitted the weight data points (R2 = 0.9991-0.9997). 3. The ducks are characterized by early maturity rate. The peak of the absolute growth rate (the inflection point of the curve) occurred at 24.1-27.6 d of age (t+). A higher ratio of the inflection to the asymptotic weights (y+/A = 0.380-0.424) was found in comparison to those from the Gompertz-type function of growth (y+/A = 0.368). 4. In the selected lines the degree of maturity at a slaughter age of 7 weeks (u7 = y7/A) ranged from 0.784 to 0.835 for males and from 0.819 to 0.889 for females. 5. Ducks within the non-selected control line had a significantly lower maturing rate than the selected lines. 6. Sexual dimorphism was recorded for all growth parameters analysed. Females have faster maturation rate than males (higher values of y+/A, u7, k and a shorter auto-acceleration phase of growth). 7. High interline differences were found for body weight (A, y+, y7) and for absolute growth rate (v, v+) and smaller ones for parameters of the maturation rate (y+/A, u7, k and t+). 8. The intragroup phenotype correlation between growth parameters and the use of weight data only up to 7 weeks of age for the estimation of parameters of the Richards function are discussed.