全文获取类型
| 收费全文 | 174篇 |
| 免费 | 27篇 |
专业分类
| 林业 | 1篇 |
| 综合类 | 11篇 |
| 农作物 | 3篇 |
| 水产渔业 | 1篇 |
| 畜牧兽医 | 181篇 |
| 植物保护 | 4篇 |
出版年
| 2023年 | 4篇 |
| 2021年 | 1篇 |
| 2020年 | 3篇 |
| 2019年 | 6篇 |
| 2018年 | 3篇 |
| 2017年 | 6篇 |
| 2016年 | 15篇 |
| 2015年 | 5篇 |
| 2014年 | 14篇 |
| 2013年 | 34篇 |
| 2012年 | 7篇 |
| 2011年 | 8篇 |
| 2010年 | 14篇 |
| 2009年 | 8篇 |
| 2008年 | 7篇 |
| 2007年 | 6篇 |
| 2006年 | 6篇 |
| 2005年 | 9篇 |
| 2004年 | 1篇 |
| 2003年 | 2篇 |
| 2002年 | 5篇 |
| 2001年 | 2篇 |
| 2000年 | 3篇 |
| 1999年 | 1篇 |
| 1998年 | 8篇 |
| 1997年 | 3篇 |
| 1996年 | 3篇 |
| 1995年 | 5篇 |
| 1994年 | 1篇 |
| 1993年 | 7篇 |
| 1992年 | 1篇 |
| 1991年 | 1篇 |
| 1990年 | 2篇 |
排序方式： 共有201条查询结果，搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
Knowledge of normal renal parameters, as documented in mature horses, is essential for the accurate evaluation of abnormal kidneys. Although the ultrasonographic appearance and location of the abdominal organs in foals and the renal dimensions in neonates have been reported, there is currently no information available for the assessment of normal organ growth in foals. The objectives of the study were to describe the ultrasonographic characteristics, location and variations of the thoracic and abdominal organs with relation to age, height and weight; and provide a growth table for comparison with diseased foals. The thoracic and abdominal cavities of 10 healthy foals were evaluated at ages 1, 7, 14 and 21 days and 1, 2, 3, 4, 5 and 6 months. The equipment used was an Ausonics Opus Plus ultrasound. For every evaluation, weight and height were obtained, the foals were sedated and the area of study was clipped and cleaned. The ultrasonographic location, appearance and measurements of the different organs were recorded for each examination. The study revealed that foals age >1 month resemble the mature ultrasonographic pattern. Continual growth of the organs was observed from Day 1 to age 6 months, being faster in the first month. Organ growth was closely correlated with age, but not with sex, height or weight in healthy foals up to age 6 months. Our study has provided measurements of longitudinal organ growth in healthy foals, presented in a simple form for easy comparison with diseased individuals. 相似文献
8.
9.
Retracted: Effect of Post‐Thaw Storage Time on Motility and Fertility of Cryopreserved Beluga Sturgeon (Huso huso) Sperm 
下载免费PDF全文
下载免费PDF全文 The aim of this study was to test the influence of post ‐ thaw storage time on the duration of sperm motility, percentage of motile sperm, and fertilization and hatching rates of fresh sperm and sperm stored for 0, 30 and 60 min at 4°C post‐thawing. After being frozen in liquid nitrogen and then thawed, the percentage of motile sperm and duration of motility were not affected by 30 min of storage at 4°C, whereas a significant decline in these parameters was observed after 60 min of storage. Similarly, fertilization and hatching rates were significantly affected within 60 min of storage at 4°C, and the fertility of frozen‐thawed sperm was significantly lower than that of fresh sperm. We conclude that cryopreserved sperm of beluga sturgeon could be stored for 30 min without the loss of sperm quality. This described procedure for beluga sturgeon cryopreservation is reliable and efficient and therefore can be recommended for hatchery practice after scaling up this technique. 相似文献
10.