陕北白绒山羊繁育中心羊场绒山羊日粮的评价

试验选择陕北白绒山羊繁育中心羊场的成年健康母羊（怀孕前期）16只,育成母羊13只,育成公羊13只,空腹称重。测定每只羊1d的采食量,计算其摄入的营养成分含量,并与原苏联绒用山羊饲养标准比较,进行饲养水平评价。结果显示,与饲养标准比较,陕北白绒山羊繁育中心羊场的育成母羊代谢能高2．68MJ,粗蛋白低59．29g,钙低3．00g,磷低1．52g;育成公羊代谢能高3．47MJ,粗蛋白低81．92g,钙低4．42g,磷低2．62g;成年母羊代谢能高2．51MJ,粗蛋白低91．33g,钙低3．09g,磷低1．93g。结合羊的体况综合评价饲养水平基本合理,但尚需要按饲养标准增加粗蛋白、钙、磷等营养物质的供给量。     

鸡视顶盖后背侧部的纤维联系——HRP法研究

选用健康成年来航鸡9只,以20～30％HRP溶液作标记物,观察了视顶盖后背侧部的神经纤维联系。结果:在光镜下明视野视察,标记细胞出现在古纹状体后腹部、外侧螺旋核、视上交叉腹侧核、顶盖前核、峡核大细胞部和深中脑外侧核,在内侧螺旋核和视顶盖中央灰层偶见标记细胞;在腹外侧膝状体核、圆核、顶盖前顶盖下间置核、背外侧膝状体核、前顶盖下核、丘脑背外侧核、视顶盖室周纤维层以及中脑和延髓的网状结构等部位观察到标记终枝;同时观察到顶盖丘脑束中有标记纤维的横断像以及视上腹侧交叉和顶盖连合中有标记纤维。结果表明,视顶盖的纤维比较广泛,与端脑、间脑、中脑以及延髓都有联系,视上腹交叉是两眼间视觉信息交流的形态学基础。     

Infection of the cartilages of the foot

Infection of the cartilages of the foot is an uncommon condition, occurring usually secondary to wounds just above the coronary band. Effective treatment relies on surgical debridement of necrotic cartilage, but following this the prognosis for complete recovery is good.     

Handbook of the Mammals of the World

Frugivores feed on fruits and nectars that contain different types of sugars in different proportions, which provide these animals with energy. Wahlberg’s epauletted fruit bat (Epomophorus wahlbergi) has a high glucose intake irrespective of sugar concentration of nectar. It is not known how these bats regulate their blood plasma glucose concentrations in order to avoid the negative effects associated with hyperglycemia. Fruit bats have a high amount of sugar intake in a short period of time which could cause a glucose challenge and it is therefore necessary to determine whether these bats are able to regulate their blood plasma glucose concentrations within normal concentrations. This study investigated the diel variations in blood plasma glucose concentrations of E. wahlbergi. Epomophorus wahlbergi‘s blood plasma glucose concentration was lower (5.24 ± 0.38 mmol/l) at 18:00 before feeding and increased during/after feeding (8.19 ± 1.24 mmol/l) but bats appeared to regulate it within limits. Their range in concentrations was higher than the normal mammalian blood plasma glucose concentrations range. Consequently these bats appear to regulate their blood plasma glucose concentration, although at a range higher than normal mammalian levels, and thus reduce the negative consequences associated with hyperglycemia.     

犊牛腹泻与肠道菌群的变化

本文检测腹泻犊牛的直肠内8种主要正常菌群的变化,并与健康犊牛进行对比。结果发现,犊牛腹泻时,大肠杆菌、双岐杆菌和乳杆菌变化较大,而其它菌群变化较小。腹泻或将腹泻时,大肠杆菌数增加,双岐杆菌和乳杆菌数下降。腹泻康复或即将康复时,大肠杆菌减少,双岐杆菌、乳杆菌数增加。     

古浪县北部荒漠草场改良过程中植被变化动态的研究

结合古浪县北部荒漠草场生态治理工程,在自由放牧、围栏封育和人工补播条件下,对退化草场的植物种类、植被盖度、生产力水平等进行了初步的调查研究。结果表明：1）随自由放牧时间的延长,草场植被盖度、生产力逐渐下降,植物种类逐渐减少;2）随围栏封育时间的延长,放牧压力减轻,草场植被盖度、生产力逐渐提高,物种丰富度增加;3）人工补播种草加快了草场的恢复演替速度。围栏封育和人工补播使草场植物群落优势种得到加强,沙蒿Artemisia desertorum,沙米Agriophyllum squarrosura,短花针茅Stipa breviflora大量生长,草场植被盖度和生产力大幅度提高,是恢复和改良退化草场的一条行之有效的途径。     

用关键年法分析家蚕原种微粒子病发病规律

根据广东省蚕种繁殖试验所 195 7～ 1997年原种微粒子病的发病率和相应年份的年均气温 ,利用统计假设检验法初步分析了原种微粒子病发生的关键年 (峰谷年 )的变化趋势及其与气温的关系。结果发现年平均气温对原种微粒子病发生有显著的影响 ;峰年前年的年平均气温明显高于历史平均水平 ;而低谷年前年的年平均气温明显低于历史平均水平。自 2 0世纪 80年代以来 ,微粒子病发病率偏高 ,平均气温亦显著偏高 ,可见气温是造成 10多年来原种微粒子病流行的原因之一。关键年法分析微粒子病发生的结果与生产实际基本吻合。