人勤春早丁亥年新春献辞

在人们的期盼中,一个新的春天又降临了。春天来了,和煦的阳光普照神州,激情的春风吹拂大地。水流新韵山流翠,无边光景一时新。今年的春天,来得格外早。按农历说,去年是丙戌年,今年是丁亥年。在丙戌年的腊月17日,就立春了。正所谓“海日升残夜,江春入旧年。”     

后备小母猪体形、足和腿特征以及繁殖健全度评估指南（续 完）

上期回顾:上期介绍了后备小母猪选择和足及腿健全度的基本准则,选择时要考虑的其它性状特征,理想后备小母猪的标准特性,前腿评估的标准等。13足和腿的评估◆对母猪利用年限会产生不利影响的特性:◇僵直的后腿胶骨对青年母猪的初产年龄、产仔间隔和总产仔数及仔猪出生至断奶间的死亡率都会产生不     

Bacterial growth in albumen taken from the eggs of domestic hens and waterfowl

Gram‐negative bacteria formed small populations in albumen taken from the eggs of domestic hens. Adding yeast extract (final concentration 100 mg/ml) to the albumen did not increase the extent of microbial growth. Large populations were formed in albumen containing FeSO₄.₇H₂O (final concentration 9.95 mg/ml) or this sulphate and yeast extract and the organisms utilised the glucose of the egg white with a concomitant increase in the CO₂ released to the atmosphere. The rate of glucose utilisation, as judged by the rate and extent of the change in pH, was slow in albumen of the eggs of domestic hens to which had been added a heavy suspension of a fermentative bacterium. The retardation of glucose fermentation was a feature also of the albumen of eggs of several species of waterfowl. Both the rate and extent of glucose fermentation was increased when yeast extract (final concentration 100 mg/ml) was added to heavily seeded albumen but ferrous sulphate did not have a significant influence on the rate of glucose utilisation.