Effect of suckling on the reproductive performance and metabolic status of obese Japanese black cattle during the early postpartum period     

Kawashima C  Kida K  Matsuhashi M  Matsui M  Shimizu T  Matsunaga N  Ishii M  Miyake Y  Miyamoto A 《The Journal of reproduction and development》2008,54(1):46-51

The aim of our study was to investigate the effects of suckling on reproductive performance and metabolic status of obese (mean body condition score of more than 4.0 on a scale of 1-5) maternal Japanese Black cows during early postpartum period. We used 7 postpartum Japanese Black cattle. Four cows were suckled ad libitum (suckled) until completion of their first artificial insemination (AI), while 3 cows were not suckled at all because they were separated from their calves immediately after parturition (non-suckled). Body weight and plasma concentrations of metabolites and hormones were measured from wk 1 to 9 postpartum. Ovarian activity was detected using plasma progesterone concentration, and all cows received their first AI after application of the Ovsynch protocol at approximately 4 months postpartum. Although body weights of non-suckled cows increased during experimental period (P<0.05), those of suckled cows remained unchanged. Plasma concentrations of glucose of non-suckled cows were higher at wk 2 postpartum (P<0.05) and their levels of non-esterified fatty acid tended to be lower at wk 1 and 2 postpartum compared with suckled cows (P<0.1); however, these differences between groups were not observed with progression of postpartum period. In addition, plasma insulin concentrations of non-suckled cows were higher than those of suckled cows during experimental period (P<0.05). During sampling period (wk 0 to 9 postpartum), onset of normal ovarian cycle was observed in all non-suckled and 2 of 4 suckled cows, and it was delayed in other 2 suckled cows compared with non-suckled cows; however, 3 suckled cows conceived at the first AI after application of the Ovsynch protocol; none of non-suckled cows conceived at this time. Overall, we suggest that suckling seems to reduce increase of body weight after parturition, although it does not improve obesity, and influences conception despite delay in resumption of normal ovarian cyclicity in obese Japanese Black cows.  相似文献   

Characterization and distribution of Staphylococcus sp. implicated for improvement of fish sauce odor   总被引：1，自引：0，他引：1  

Katsuya  FUKAMI  Masataka  SATOMI  Yasuhiro  FUNATSU  Ken-Ichi  KAWASAKI  Shugo  WATABE 《Fisheries Science》2004,70(5):916-923

ABSTRACT:   The two Staphylococcus strains that had been isolated from fish sauce mush (moromi) made from frigate mackerel in Japan and proved to improve fish sauce odor, were examined for their taxonomic positions. The sequence analysis based on 16S rRNA and rpoB showed that the two strains, R4Nu and R5G, had an identical sequence with sequence identities of 99.5% and 99.0% to the above two genes from the closest species of S. nepalensis , respectively. A DNA hybridization test of the two strains showed more than 80% DNA similarity with S. nepalensis , thus confirming the above-mentioned species identification. Polymerase chain reaction primers specific to the strain isolated from fish sauce mush were designed from rpoB and examined for the distribution of this species to various fish sauces made in Asian countries as well as to fish sauce starter (malt) made from soy beans and barley in Toyama Prefecture, Japan. The amplified DNA fragment bearing the S. nepalensis gene was detected in the enriched culture of the malt, although no positive reaction was shown with fish sauce samples. These results suggest that S. nepalensis indebted to improve fish sauce odor was originated from the fish sauce starter malt.  相似文献   

The electrical conductivity of post-perovskite in Earth's D' layer     

Ohta K  Onoda S  Hirose K  Sinmyo R  Shimizu K  Sata N  Ohishi Y  Yasuhara A 《Science (New York, N.Y.)》2008,320(5872):89-91

Recent discovery of a phase transition from perovskite to post-perovskite suggests that the physical properties of Earth's lowermost mantle, called the D' layer, may be different from those of the overlying mantle. We report that the electrical conductivity of (Mg0.9Fe0.1)SiO3 post-perovskite is >10(2) siemens per meter and does not vary greatly with temperature at the conditions of the D' layer. A post-perovskite layer above the core-mantle boundary would, by electromagnetic coupling, enhance the exchange of angular momentum between the fluid core and the solid mantle, which can explain the observed changes in the length of a day on decadal time scales. Heterogeneity in the conductivity of the lowermost mantle is likely to depend on changes in chemistry of the boundary region, not fluctuations in temperature.  相似文献   

Foot rot disease of sweet potato in Japan caused by Diaporthe destruens: first report,pathogenicity and taxonomy     

Maeda  Ai  Minoshima  Ayaka  Kawano  Shinji  Nakamura  Misa  Takushi  Tetsuya  Yamashiro  Maki  Kawamura  Futoshi  Oshiro  Atsushi  Ichinose  Katsuya  Okada  Yoshihiro  Rossman  Amy Y.  Hirooka  Yuuri 《Journal of General Plant Pathology》2022,88(1):33-40

Journal of General Plant Pathology - Foot rot, also known as stem rot or tuber-root rot syndrome, on sweet potato occurs in sweet potato fields in Okinawa, Japan. Isolates of one fungal species...  相似文献   

A convenient and nondestructive method using bio-impedance analysis to determine fish freshness during ice storage     

Pengxiang Yuan  Yao Wang  Riho Miyazaki  Jia Liang  Katsuya Hirasaka  Katsuyasu Tachibana  Shigeto Taniyama 《Fisheries Science》2018,84(6):1099-1108

Fish freshness can be assessed through K values, but this method has a number of limitations, including a complex procedure and destructive sampling. With the aim to develop a convenient method of assessing fish freshness, we measured the changes in K values (up to 40%) and bio-impedance (Z value; frequency 2, 5, 20, 50, 100 kHz) of ordinary muscle in fish of eight marine species, all caught in the East China Sea, during ice storage and examined their relationships. The results indicated that the K value in all fishes increased linearly with storage time, while their Z value decreased only after 24 h of storage. Moreover, after 24 h of storage and at K values of < 40%, impedance ratios at 2–100 kHz (C value, C?=?Z_{2 kHz}/Z_{100 kHz}) were significantly correlated (p ?<?0.05) with both storage time and K values in all fishes. These findings suggest that the bio-impedance ratio effectively reflects the change in ATP-related compounds of fish and that a convenient, nondestructive method using the C value can be used instead of the complicated K value measurement to assess the freshness of marine fishes after 24 h of ice storage.  相似文献