全文获取类型
收费全文 | 333篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
林业 | 19篇 |
农学 | 15篇 |
45篇 | |
综合类 | 10篇 |
农作物 | 6篇 |
水产渔业 | 41篇 |
畜牧兽医 | 174篇 |
园艺 | 3篇 |
植物保护 | 31篇 |
出版年
2023年 | 1篇 |
2022年 | 6篇 |
2021年 | 20篇 |
2020年 | 8篇 |
2019年 | 3篇 |
2018年 | 12篇 |
2017年 | 6篇 |
2016年 | 16篇 |
2015年 | 30篇 |
2014年 | 31篇 |
2013年 | 22篇 |
2012年 | 12篇 |
2011年 | 18篇 |
2010年 | 11篇 |
2009年 | 16篇 |
2008年 | 18篇 |
2007年 | 20篇 |
2006年 | 15篇 |
2005年 | 13篇 |
2004年 | 15篇 |
2003年 | 14篇 |
2002年 | 17篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1994年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1963年 | 1篇 |
1958年 | 1篇 |
1954年 | 1篇 |
1953年 | 1篇 |
1950年 | 1篇 |
1946年 | 1篇 |
排序方式: 共有344条查询结果,搜索用时 15 毫秒
31.
Weiping HUANG Masashi NAGANO Sung-Sik KANG Yojiro YANAGAWA Yoshiyuki TAKAHASHI 《The Journal of reproduction and development》2014,60(1):9-13
The objective of this study was to clarify the effects of prematurational culture
(pre-IVM) supplemented with 3-isobutyl-1-methylxanthine (IBMX) on nuclear and cytoplasmic
maturation of in vitro-grown bovine oocytes. In experiment 1, oocytes (95
μm in diameter) derived from early antral follicles (0.5–1 mm in diameter) were cultured
for 12 days for in vitro growth (IVG). IVG oocytes with a normal
appearance were subjected to examinations of diameter and chromatin structure in the
germinal vesicle (GV) before IVM. In addition, percentages of metaphase II (M II) were
examined after IVM. Regardless of pre-IVM, the mean diameters of IVG oocytes were about
115 μm. The proportions of GV3 (50.0%) and M II stages (80.1%) of IVG oocytes with pre-IVM
were higher than those without pre-IVM (28.0 and 49.4%, respectively). In experiment 2,
the fertilizability and developmental competence of IVG oocytes were examined. Regardless
of pre-IVM, the normal fertilization rates of IVG oocytes were similar (around 70%) but
were lower than that of in vivo-grown oocytes (88.0%). Cleavage and
blastocyst rates of IVG oocytes with pre-IVM (63.0 and 26.1%, respectively) were higher
than those without pre-IVM (45.8 and 12.7%, respectively). The blastocyst rate based on
cleaved IVG oocytes with pre-IVM (41.7%) was similar to that of in
vivo-grown oocytes (48.7%), although the cleavage rate of IVG oocytes with
pre-IVM was lower than that of in vivo-grown oocytes. In conclusion,
pre-IVM with IBMX improved the maturational and developmental competences of IVG oocytes,
probably due to promotion of their chromatin transition and synchronization of meiotic
progression. 相似文献
32.
Azusa SOMEYA Ryoko FUKUSHIMA Michiko YOSHIDA Yasuyuki TANAHASHI Tangmunkhong PRAPEUK Reiko IIZUKA Hiroshi HIRAMI Atsushi MATSUDA Shunichi TAKAHASHI Goro KURITA Takashi KIMURA Misuzu SEO Masayuki FUNABA Yoshii NISHINO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(8):1157-1160
33.
34.
35.
36.
37.
38.
39.
Yosuke Sasaki Tadaaki Tokunaga Ryoko Uemura Masuo Sueyoshi 《Animal Science Journal》2014,85(3):213-218
We investigated the reproductive and lifetime performances of Kagoshima Berkshire gilts and sows. We examined 20 605 parity records of 4419 pigs for 2008 to 2012 on a farrow‐to‐finish commercial farm. The mean parity (± SD) of all animals was 3.0 ± 2.1. For farrowing performance, the highest numbers of total pigs born and pigs born alive were found in sows with parities 5 and 6 and with parity 3–6, respectively (P < 0.05). Regarding weaning and mating performance, sows with parity 2 had the lowest preweaning mortality (P < 0.05). The longest weaning‐to‐first‐mating interval was found in parity 1 pigs, and the interval decreased as parity increased (P < 0.05). Parities 0 and 1 pigs had the lowest farrowing rate and those with parity 4 had the highest farrowing rate (P < 0.05). The mean parity at culling, total number of pigs born alive in a lifetime, and nonproductive days in a lifetime were 5.5 ± 2.93, 49.2 ± 24.72 pigs, and 132.1 ± 83.34 days, respectively. These animals had a lower litter size and fertility that the F1 crossbred sows mainly used in Japan, but a similar tendency for performance by parity. 相似文献
40.
K. TAKAHASHI N. OKAMOTO A. KUMAGAI M. MAITA J. S. ROHOVEC Y. IKEDA 《Journal of fish diseases》1994,17(1):77-83
Abstract. Studies were conducted to clarify the relationship between growth rate and disease progression of erythrocytic inclusion body syndrome (EIBS) in artificially infected coho salmon, Oncorhynchus kisutch (Walbaum). In the diseased state, the haematocrit values decreased and the number of erythrocytes with inclusions was higher in faster growing fish. Rapid growth was accompanied by an abundance of immature erythrocytes, which had the greatest incidence of inclusion bodies. 相似文献