排序方式: 共有47条查询结果,搜索用时 31 毫秒
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L.H.H. HERNANDEZ S.-I. TESHIMA M. ISHIKAWA S. ALAM S. KOSHIO & Y. TANAKA 《Aquaculture Nutrition》2005,11(1):3-9
A 70‐day feeding experiment was conducted to assess the dietary vitamin A (VA) requirements of juvenile Japanese flounder (Paralichthys olivaceus). Six semi‐purified diets with VA supplementations of 0, 5000, 10 000, 15 000, 20 000 and 25 000 IU kg?1 were fed twice a day to triplicate groups of 20 juveniles per tank with an initial weight of 1.59 ± 0.01 g (mean ± SE). Weight gain (WG) and specific growth rate (SGR) increased as dietary VA increased up to 10 000 IU kg?1. Significantly lower WG and SGR were observed for the 0 IU kg?1 treatment than for treatments of 5000, 10 000 and 15 000 IU kg?1. Highest WG and SGR were observed in fish fed 10 000 IU kg?1; slightly lower values were recorded in fish fed 15 000, 20 000 or 25 000 IU kg1. No significant difference was observed in survival rate among treatments. Whole body total lipid was significantly higher in fish fed 0 and 5000 IU kg?1 than for other levels. Reduced growth and small livers were observed as signs of VA deficiency in fish fed 0 IU kg?1. Slightly reduced growth and pale fragile livers were observed as effects of VA excess in fish fed 25 000 IU kg?1. Total retinol contents in liver and eyes increased with increasing levels of dietary VA. No retinol was detected in livers, and significantly lower total retinol content was observed in eyes, of fish fed 0 IU kg?1. WG analysed by the broken line method indicated that an optimum dietary VA requirement of 9000 IU kg?1. 相似文献
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Motoki SASAKI Yoko AMANO Daisuke HAYAKAWA Toshio TSUBOTA Hajime ISHIKAWA Toshihiro MOGOE Seiji OHSUMI Masafumi TETSUKA Akio MIYAMOTO Yutaka FUKUI Teguh BUDIPITOJO Nobuo KITAMURA 《The Journal of reproduction and development》2013,59(2):159-167
There are few reports describing the structure and function of the whale placenta with
the advance of pregnancy. In this study, therefore, the placenta and nonpregnant uterus of
the Antarctic minke whale were observed morphologically and immunohistochemically.
Placentas and nonpregnant uteri were collected from the 15th, 16th and 18th Japanese Whale
Research Programme with Special Permit in the Antarctic (JARPA) and 1st JARPA II organized
by the Institute of Cetacean Research in Tokyo, Japan. In the macro- and microscopic
observations, the placenta of the Antarctic minke whale was a diffuse and epitheliochorial
placenta. The chorion was interdigitated to the endometrium by primary, secondary and
tertiary villi, which contained no specialized trophoblast cells such as binucleate cells,
and the interdigitation became complicated with the progress of gestation. Furthermore,
fetal and maternal blood vessels indented deeply into the trophoblast cells and
endometrial epithelium respectively with fetal growth. The minke whale placenta showed a
fold-like shape as opposed to a finger-like shape. In both nonpregnant and pregnant uteri,
many uterine glands were distributed. The uterine glands in the superficial layer of the
pregnant endometrium had a wide lumen and large epithelial cells as compared with those in
the deep layer. On the other hand, in the nonpregnant endometrium, the uterine glands had
a narrower lumen and smaller epithelial cells than in the pregnant endometrium. In
immunohistochemical detection, immunoreactivity for P450scc was detected in most
trophoblast cells, but not in nonpregnant uteri, suggesting that trophoblast epithelial
cells synthesized and secreted the sex steroid hormones and/or their precursors to
maintain the pregnancy in the Antarctic minke whale. 相似文献
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Sayoko SUZUKI Shin-ichi ISHIKAWA Keizo ARIHARA Makoto ITOH 《Animal Science Journal》2007,78(3):293-300
The composition of the molecular species of triacylglycerols (TG) in subcutaneous fat biopsied from Japanese Black steers was studied during the fattening period. An analysis of the fatty acid (FA) composition of the TG showed that palmitic, palmitoleic, stearic and oleic acids were the major FA, together accounting for over 80% of the total FA. The concentrations of C14:0, C16:0 and C18:0 decreased between 10 and 30 months of age, while those of C16:1 c9 and C18:1 c9 increased during the fattening period. The major molecular species among more than 40 compounds were palmitoyl‐dioleoyl‐glycerol (POO) and dipalmitoyl‐oleoyl‐glycerol (PPO). POO showed the highest concentration during the fattening period. The levels of palmitoyl‐oleoyl‐linoleoyl glycerol and some tentatively identified molecular species increased during the fattening period, while the levels of tripalmitoyl, dipalmitoyl‐stearoyl‐glycerol, palmitoyl‐distearoyl and palmitoyl‐stearoyl‐oleoyl‐glycerol decreased with growth. A comparison of the experimental values of TG molecular species with theoretical values derived from the experimental FA contents showed that the FA distribution in TG was non‐random. TG synthesis favors the formation of TG molecular species containing at least one C16 FA, rather than three C18 FA. 相似文献
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Rie YOKOTA Kenshi SATO Yoshihiro WADA Yoshiharu ISHIKAWA Koichi KADOTA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(12):1697-1700
Immature T cell neoplasms in three young Holstein cattle with neoplastic involvement of
the thymus are described. Case 1, with a precursor T lymphoblastic leukemia (calf form of
leukosis), was an 86-day-old female calf. The leukemia was characterized by replacement of
the bone marrow and spleen by leukemia cells, but preservation of epithelial frameworks
throughout the thymus. The other two neoplasms were thymic γδ T cell lymphomas, which were
observed in a 246-day-old steer (case 2) and a 16-month-old heifer (case 3). Histological
examination revealed obliteration of the normal thymic architecture and stromal fibrosis,
with the spleen and liver far less severely affected than in case 1. There were
cytological differences bewteen the tumors in case 1 and cases 2 and 3. Additionally, WC1
and CD8 were expressed only in the latter. Thus, the leukemia and these lymphomas should
be regarded as independent disease entities on the basis of histological and
immunohistochemical characteristics. 相似文献
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Mari OKAMOTO Keisuke OGUMA Nanako YAMASHITA-KAWANISHI Toshihiro ICHIJO Shinichi HATAMA Maiko ENDO Maya ISHIKAWA Takeshi HAGA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2020,82(11):1607
Bovine foamy virus (BFV) is distributed through worldwide cattle herds. Although the biological features of BFV are not well understood, appearance of clinical manifestation by superinfection with other microorganisms is inferred. In Japan, reports of genomic characterizations and epidemiology of this virus are limited. In this study, we performed whole genomic sequencing of BFV strains Ibaraki and No.43, which were isolated in this country. Additionally, we investigated BFV in geographically distant four daily farms in Japan, to estimate the distribution of BFV and its correlation to bovine leukemia virus (BLV). BFV was distributed throughout Japan; the average positive rate was 12.7%. The nucleotide sequence identities of the isolates were 99.6% when compared with BFV strain isolated in the USA. The phylogenetic tree using env gene sequence showed strains Ibaraki, No.43 and Kagoshima were sorted in the same cluster including the USA and Chinese strains, while Hokkaido strain was in the other cluster including European strains. Although no clear correlation between BFV and BLV could be found, BFV and BLV infections were likely to increase with ages. Our data on epidemiology and characteristics of BFV will provide important information to reveal biological features of BFV. 相似文献
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