巻号一覧
70 巻, 3 号
選択された号の論文の6件中1～6を表示しています
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Keigo KUCHIDA, Shogo TSURUTA, L. D. VAN Vleck, Mitsuyoshi SUZUKI, Shun ...1999 年 70 巻 3 号 p. 107-112
発行日: 1999/05/25
公開日: 2008/03/10
ジャーナル フリーFactors affecting the difference between the Beef Marbling Standard (BMS) number assigned by examiners (BMSSUB) and the BMS number estimated from marbling percentage by image analysis (BMSFAT) were investigated. Pictures of ribeye area of 106 Japanese Black steers with BMSSUB were used. Marbling percentage in ribeye area, means and standard deviations of the area and of the form score for marbling particles classified into 5 levels (over 0.01, 0.05, 0.1, 0.5, and 1.0cm2), and standard deviations of marbling percentages in small areas which were obtained by dividing the ribeye into 4, 9, 25, and 100 partitions were calculated by image analysis. Multiple regression equations with the difference between BMSSUB and BMSFAT as the dependent variable were obtained by a stepwise method starting with 25 independent covariates for image analysis traits and ribeye area. The final number of independent covariates used in the equation was limited to three. The range of the difference between BMSFAT and BMSSUB was from -3 to +4 and the percentage of the differences within±1 was 67.0%, while the range of the difference between BMSSUB and the BMS number which was calculated from a multiple regression equation was from -2 to +2 and percentage of the differences within±1 was 91.5%, These results show that the accuracy of prediction for BMS number has improved by using not only the ratio of fat area but also other image analysis traits.抄録全体を表示PDF形式でダウンロード (518K) -
Masayuki SHOJO, Hiroaki IWAISAKI1999 年 70 巻 3 号 p. 113-117
発行日: 1999/05/25
公開日: 2008/03/10
ジャーナル フリーIn this paper, for one specific type of ratio traits, or a proportion-defined trait (denoted simply as proportion trait), whose numerator trait is contained also in the denominator as its one component, formulae to predict selection differentials for the component traits are derived, assuming upward and downward truncation selection based on phenotypic value of the proportion trait. Two component traits are considered, supposing that these traits follow bivariate normal law and their coefficients of variation are small. The phenotypic changes of component traits are described in terms of a given proportion of population selected, the corresponding truncation point on the proportion trait and phenotypic parameters for the component traits. Using the formulae derived, a deterministic investigation of the selection differentials is conducted for three selected sets of phenotypic parameters for component traits with which the shapes of the distribution of the proportion trait are very nearly symmetric, skewed to the right and skewed to the left. In addition, the signs of the selection differentials are theoretically determined by examining the related inequality including a function of truncation point and the phenotypic parameters. As a consequence, it is revealed that for each of upward and downward selection, there occur three kinds of possible combinations of the signs according to the situations of the phenotypic parameters.抄録全体を表示PDF形式でダウンロード (383K) -
Toshihiro TAKAHASHI, Kan SATO, Yukio AKIBA1999 年 70 巻 3 号 p. 118-123
発行日: 1999/05/25
公開日: 2008/03/10
ジャーナル フリーIn a viewpoint to explore an experimental model to study the regulatory mechanism of hepatic lipogenesis by n-3 fatty acids on hepatic lipogenesis, three experiments were undertaken to prepare mono fatty acid-enriched plasma membrane phospholipid in chicken hepatocytes. Incubation with 500μM α-linolenic acid for 24h in the primary culture of chicken hepatocytes significantly increased α-linolenic acid content and decreased oleic acid content in the plasma membrane phospholipid. In a same fashion, addition of linoleic acid or oleic acid to the media resulted in the higher proportion of the corresponding fatty acid in the plasma membrane. In the subsequent incubation in a fatty acid-free media of α-linolenic acid-enriched cells, α-linolenic acid content decreased gradually with a half life of 24h. Our results suggest that fatty acid supplementation to the culture medium modifies the fatty acid composition of plasma membrane phospholipid of chicken hepatocytes. The present chicken primary culture system may be applicable for investigation of regulatory mechanism of lipid metabolism.抄録全体を表示PDF形式でダウンロード (472K) -
Hisashi SUSAKI, Tohru MATSUI, Kin-Ya ASHIDA, Shoji FUJITA, Takashi NAK ...1999 年 70 巻 3 号 p. 124-128
発行日: 1999/05/25
公開日: 2008/03/10
ジャーナル フリーThe objective of the present research was to compare the availability of zinc in the form of organic zinc, zinc amino acid chelate, with in the form of sulfate in growing pigs. Twenty-five pigs of 25 d-old were divided into 5 groups. Five pigs of each group were fed a basal diet which was a commercial ration without supplying zinc or diets added 25, 50 or 100mg/kg dry matter zinc in the form of amino acid chelate, or 100mg/kg dry matter zinc in the form of sulfate for 30d. The basal diet contained 47mg/kg of zinc and did not satisfy its requirement for the pigs. The diets contained twice more calcium and 15 times more copper than the requirements for the pigs. Femoral and serum zinc concentrations were increased with supplying zinc amino acid chelate and were significantly higher in pigs given the organic zinc than in those given the inorganic zinc at the level of 100mg/kg diet. Zinc solubility in ileal digesta was gradually increased with supplying the organic zinc. Additionally, zinc solubility tended to be higher in the pigs given organic zinc than in those given the same amount of inorganic zinc. These results suggested that the availability of organic zinc was higher than inorganic zinc in the pigs fed a high calcium and copper diet, which, at least partly, resulted from the higher solubility of organic zinc in the ileum.抄録全体を表示PDF形式でダウンロード (422K) -
Yusuke EGUCHI, Toshio TANAKA, Tadashi YOSHIMOTO1999 年 70 巻 3 号 p. 129-134
発行日: 1999/05/25
公開日: 2008/03/10
ジャーナル フリーThe courtship behavior of wild boars was observed and compared with that of domestic pigs in order to clarify the variance of behavior accompanying with domestication. Two groups under captive conditions were used in this experiment. Each group consisted of one male and five or six females. The statistical sequence of male courtship behavior was determined. The sequences of following to sniffing, sniffing to chin-resting and leaving, and chin-resting to mounting were positively significant (P<0.001). Sniffing determines whether male wild boars continue the courtship behavior or not. There were some differences between wild boars and domestic pigs in their courtship behavior. According to the results of previous studies on domestic pigs, nosing was located in the center of the courtship behavior flow diagram, and there were significant behavioral transitions from all courtship behaviors to nosing, and from nosing to mounting. On the other hand, only two patterns of significant behavioral transition, from nosing to head to head and from mounting to following, were observed in wild boars. It is likely that the courtship behavior of wild boars is, therefore, more fixed than that of domestic pigs. The courtship behavior of male wild boars focused significantly more on the left hand side of females than on the right hand side (P<0.05). Flehmen-like behavior after vulva-sniffing, urine-sniffing and dung-sniffing was observed. This behavior continued from two to twenty-five seconds.抄録全体を表示PDF形式でダウンロード (463K) -
Mariko TERASHIMA, Tetsuo IMAI, Yasumasa CHONAN, Kunio SHIRAI1999 年 70 巻 3 号 p. 135-141
発行日: 1999/05/25
公開日: 2008/03/10
ジャーナル フリーThe effect of xenon arc irradiation on the extractability and properties of mink hair protein treated with sodium thioglycolate solution was investigated. Over 50% of the intact sapphire mink hair was dissolved when treated with TG 11 (0.1M sodium thioglycolate, pH 11) and TG/G-7 (0.1M sodium thioglycolate, 6M guanidine-HCI, pH 7), but hardly dissolved with TG/U-7 (0.1M sodium thioglycolate, 7M urea, pH 7). The extractability of underfur was higher than that of guard hair with TG 11 or TG/G-7. The extractability with TG 11 or TG/G-7 was remarkably decreased in intact hair than irradiated hair. This implies that the irradiation-induced deterioration of mink hair involves the formation of some additional intermolecular or interpeptide crosslinks other than the original disulfide bridges in native hair. Amino acid analysis, SDS-PAGE and size exclusion chromatography of TG/G-7 extract revealed that the irradiation of mink hair made preferentially microfibril protein insoluble, and leaves matrix protein especially high-glycine-tyrosine component soluble.抄録全体を表示PDF形式でダウンロード (974K)
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