收费全文 | 438篇 |
免费 | 40篇 |
国内免费 | 1篇 |
林业 | 7篇 |
农学 | 11篇 |
基础科学 | 1篇 |
23篇 | |
综合类 | 53篇 |
农作物 | 20篇 |
水产渔业 | 4篇 |
畜牧兽医 | 338篇 |
园艺 | 1篇 |
植物保护 | 21篇 |
2023年 | 7篇 |
2020年 | 7篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 11篇 |
2016年 | 21篇 |
2015年 | 8篇 |
2014年 | 11篇 |
2013年 | 16篇 |
2012年 | 16篇 |
2011年 | 18篇 |
2010年 | 10篇 |
2009年 | 10篇 |
2008年 | 12篇 |
2007年 | 17篇 |
2006年 | 17篇 |
2005年 | 14篇 |
2004年 | 18篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 6篇 |
2000年 | 8篇 |
1999年 | 9篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1992年 | 3篇 |
1991年 | 13篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1986年 | 6篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1980年 | 4篇 |
1978年 | 6篇 |
1977年 | 9篇 |
1975年 | 6篇 |
1974年 | 7篇 |
1973年 | 3篇 |
1971年 | 4篇 |
1970年 | 8篇 |
1968年 | 3篇 |
1967年 | 6篇 |
1966年 | 7篇 |
1965年 | 3篇 |
1955年 | 3篇 |
2. Chemical tests indicated 72.5% of the total lysine in HFM was available.
3. Total lysine concentration of 11.3 g/kg diet maximised performance during the period 0 to 34 d.
4. Reduction in dietary methionine content during the period 0 to 34 d from 4.2 g/kg to 3.2 g/kg did not depress performance on diets containing 60 g HFM/kg.
5. The results indicate that at least 57% by weight of the total sulphur amino acid requirement of broilers can be provided by cystine. 相似文献
2. Pasteurisation of egg albumen caused a decrease in viable cells of less than 10‐fold, while pasteurisation of whole egg caused decreases of more than 100‐fold in only two of the eight strains studied. After growth in whole egg, some strains were more resistant to pasteurisation in whole egg.
3. Strep, faecalis multiplied in raw and pasteurised whole egg but not in egg albumen.
4. Strep, faecium multiplied in raw and pasteurised whole egg only after an initial decline in viability which was not shown by cells adapted to whole egg. Together with storage temperature this affected the number of viable cells after a storage period of 5 d.
5. In raw and pasteurised egg albumen Strep, faecium strains lost viability; this was maximal at 37 °C and more cells survived as the storage temperature decreased. 相似文献
![点击此处可从《Equine veterinary journal》网站下载免费的PDF全文](/ch/ext_images/free.gif)
METHODS: Holstein dairy cows were allocated to two herds with similar parity, days in milk and milk production. They were grazed in one paddock that was divided in two, with a fixed water trough at one end. Cows were moved twice daily to grazing plots within the paddock. Control cows (n=66) could only access water from the fixed trough, whereas supplemented cows (n=67) also received water from a mobile trough within the grazing plot. Milk production of each cow, and water consumption of the two herds were measured daily over 62 days. Milk composition for each herd was determined weekly from Days 18 to 60 of the study, and grazing behaviour was observed between 08:00 and 16:00 hours on Days 11–15, 19–22 and 39–43.
RESULTS: Over the 62 days of the study, supplemented cows produced 1.39 (SE 0.11) L/cow/day more milk than Control cows (p=0.027). Estimated mean daily water intake was 50.4 (SE 2.1) L/cow/day for supplemented cows and 58.2 (SE 2.7) L/cow/day for Control cows (p=0.004). Percentage total solids in milk was higher for supplemented (12.5 (SE 0.06)%) than Control (12.4 (SE 0.04)%) cows (p=0.047). During the periods of behavioural observation, a higher percentage of cows in the water supplemented than the Control herd were observed in the grazing area (p=0.012).
CONCLUSIONS AND CLINICAL RELEVANCE: This preliminary study demonstrated that provision of water to dairy cows within the grazing plot was beneficial for milk production and composition, and may be associated with longer periods spent within the grazing area, during hot weather in the Pampa region of Argentina. 相似文献