全文获取类型
收费全文 | 795篇 |
免费 | 48篇 |
专业分类
林业 | 11篇 |
农学 | 14篇 |
基础科学 | 2篇 |
101篇 | |
综合类 | 110篇 |
农作物 | 6篇 |
水产渔业 | 38篇 |
畜牧兽医 | 536篇 |
园艺 | 7篇 |
植物保护 | 18篇 |
出版年
2019年 | 9篇 |
2018年 | 7篇 |
2016年 | 8篇 |
2014年 | 10篇 |
2013年 | 92篇 |
2012年 | 11篇 |
2011年 | 14篇 |
2010年 | 10篇 |
2009年 | 10篇 |
2008年 | 20篇 |
2007年 | 25篇 |
2006年 | 19篇 |
2005年 | 22篇 |
2004年 | 24篇 |
2003年 | 27篇 |
2002年 | 11篇 |
2001年 | 14篇 |
2000年 | 14篇 |
1999年 | 10篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1996年 | 7篇 |
1995年 | 7篇 |
1993年 | 12篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 9篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 10篇 |
1985年 | 13篇 |
1984年 | 7篇 |
1983年 | 8篇 |
1976年 | 13篇 |
1969年 | 7篇 |
1968年 | 15篇 |
1966年 | 8篇 |
1964年 | 8篇 |
1963年 | 7篇 |
1960年 | 26篇 |
1959年 | 10篇 |
1957年 | 22篇 |
1956年 | 12篇 |
1955年 | 27篇 |
1954年 | 24篇 |
1944年 | 10篇 |
1943年 | 8篇 |
1942年 | 7篇 |
1941年 | 19篇 |
1940年 | 8篇 |
排序方式: 共有843条查询结果,搜索用时 15 毫秒
102.
J.M.B. Smith M.SC. PH.D. 《New Zealand veterinary journal》2013,61(5):83-84
Extract In order to utilize spring growth efficiently under a system of grassland farming, a New Zealand dairy farmer endeavours to calve as many cows as possible within a four to six weeks' period. To maintain this calving pattern, herd members must conceive by 70 to 80 days after calving. Consequently normal postparturient uterine involution, together with a minimum of delay in the onset of ovarian activity and oestral cyclicity, is of vital importance. A study of these phenomena may be very rewarding in helping to achieve optimal reproductive efficiency. 相似文献
103.
John M.B. Smith M.SC. PH.D. 《New Zealand veterinary journal》2013,61(10):210-211
Extract Sir,—A 7-month-old lamb was presented for slaughter, one of a line of 460. The animal was in good condition and, except for a moderately enlarged abdomen, no abnormalities could be detected on ante-mortem examination. 相似文献
104.
105.
Abstract Extract Sir,—Japanese workers (Matumoto el al., 1965) have examined 388 horse sera from 17 countries including New Zealand and have found evidence of a high incidence of infection with equine rhinopneumonitis virus. The New Zealand material was supplied between 1957 and 1960, by Dr J. D. Manning, then of the National Health Institute, Wellington. 相似文献
106.
J.R.H. Andrews M.SC. PH.D. 《New Zealand veterinary journal》2013,61(10):194-195
Extract Sir, — In the course of research on infectious bronchitis (IB) in chickens in New Zealand, one strain of IB virus was seleted and attenuated as a local vaccine virus and produced in limited quantities at Massey University for trial purposes. 相似文献
107.
108.
109.
AIM: To discover whether cross infection between red deer (Cervus elaphus) and cattle is possible with either a bovine isolate of the cattle lungworm, Dictyocaulus viviparus, or with a cervine isolate of the lungworm, Dictyocaulus eckerti. METHOD: Twelve cattle and 12 red deer were reared parasitefree from birth. At 3–4 months of age, half of each group (n=6) were experimentally infected with D. viviparus and the other half with D. eckerti. The course of infection was monitored for 34 days, after which the animals were slaughtered and the lungs removed to assess levels of infection. RESULTS: Faecal larval counts demonstrated that patent Dictyocaulus infections occurred in all groups. At necropsy, adult worms were found in the lungs in all groups except the cattle that were infected with D. eckerti. The largest numbers of adult worms were found in the lungs of the red deer infected with D. eckerti. CONCLUSION: It was demonstrated that both cattle and red deer could be infected with either D. viviparus or D. eckerti. However, D. eckerti larvae that originated from deer established more successfully in deer and D. viviparus larvae that originated from cattle established more successfully in cattle. 相似文献
110.
D.E. Gardner Ph.D. B.V.Sc. Dip.Microbiol. M.A.C.V.SC. D. Martinovich B.V.Sc. M.S. M.R.C.V.S. M.A.C.-V.Sc. Dip.Agric. D.A. Woodhouse A.I.M.L.T. 《New Zealand veterinary journal》2013,61(6):117-122
Sarcocysts morphologically similar to Sarcocystis muris were observed in the skeletal muscles of mice dosed with free isosporan sporocysts recovered from the faeces of naturally infected cats. Kittens fed these mice shed similar sporocysts measuring 8.7 ±0.1 x 10.8 ±0.1 μm in their faeces five to six days later. Feeding these sporocysts to mice and rats resulted in the formation of identical sarcocysts in mice, but not rats. Attempts to induce similar infections in mice using naturally acquired isolates of I. felis were unsuccessful. 相似文献