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Articles by Masaoki Tsudzuki
Total Records ( 6 ) for Masaoki Tsudzuki
  Minani Takawaki , Hiroshi Tanizawa , Eriko Nakasai , Jun-ichi Shiraishi , Shin-Ichi Kawakami , Takao Oka , Masaoki Tsudzuki and Takashi Bungo
  The objective of the present study was to conduct amino acid profiling of two Japanese indigenous hens (Tosa-jidori; TJI and Ukokkei; UKO) and compared with a commercial hen (JL). Asparagine, leucine and proline levels in commercial layers were higher than those in both native Japanese chickens. Lysine and glutamate in UKO were higher than those in others and taurine was also higher than in JL. Serine in UKO was lower than those in others and methionine and cysteine were also lower than in JL. Arginine in TJI was lower than those in JL and UKO. No significant differences between breed/line were observed in histidine, threonine, glutamine, glycine, alanine, valine, isoleucine, tyrosine, phenylalanine and tryptophan. These results suggest that levels of dietary amino acid requirements might be different between native Japanese chickens.
  Ken Ohara , Masahiro Takayama , Tatsuhiko Goto , Sayed A.M. Osman and Masaoki Tsudzuki
  The aim of this study is to reveal whether there are differences in live body weights and growth curves based on Gompertz function among three plumage color varieties (black-breasted white, black-breasted red and white) of the Japanese extremely long-tailed chicken breed (Tosa-no-Onagadori, briefly Onagadori), Special National Natural Treasure of Japan. Body weights were recorded every week from hatching to 30 weeks of age. In males, black-breasted red showed higher values than black-breasted white from 13 to 30 weeks of age. In females, black-breasted red was also higher than black-breasted white in body weights at 17, 19 and 26 to 30 weeks of age. Comparing the earliness of inflection points in growth curves among three varieties, the order was black-breasted white>black-breasted red>white in the female and black-breasted red>black-breasted white>white in the male. The differences in the body weights and inflection points are thought to be due to the genetic background differences between varieties. The information from this study will be useful in developing future strategies for conservation and improvement of the Onagadori as valuable genetic resource.
  Takao Oka and Masaoki Tsudzuki
  The Oh-Shamo is a native Japanese chicken breed that has been improved for cock fighting purpose for approximately 400 years. Two types of Oh-Shamo have been created: one type concentrates on offence and the other type is specialized for defense. In addition to these Oh-Shamo types for cock fighting, commercial stocks have been established to produce brand meat in Japan. In this article, we revealed the genetic differentiation among Oh-Shamo populations based on the difference in the use and the manner of fighting, as well as genetic diversity in these populations. MNA, AR, HO and HE were 2.55-4.03, 2.52-3.75, 0.420-0.577 and 0.422-0.559, respectively, throughout both fighting- and meat-purpose populations. There was a tendency for fighting-type Oh-Shamo populations to show higher genetic diversity. Inbreeding was not observed in both fighting-purpose and meat-purpose Oh-Shamo populations. Neighbor-joining tree topology based on DPS genetic distance clearly separated fighting-purpose Oh-Shamo from meat-purpose Oh-Shamo. Thus, commercial Oh-Shamo for meat production is genetically distinct from the original Oh-Shamo used for cock fighting. On the other hand, no conspicuous genetic differentiation was observed between offence- and defense-types of fighting-purpose Oh-Shamo.
  Tatsuhiko Goto , Naoki Goto , Jun-ichi Shiraishi , Takashi Bungo and Masaoki Tsudzuki
  The objective of this study was to compare the growth curve parameters for body weight of Japanese native chickens (Onaga-dori, Tosa-jidori, Ukokkei and Hinai-dori) using a non-linear model, Gompertz function. The data were collected from the four indigenous breeds together with two foreign breeds (White Plymouth Rock and Brown Leghorn) that were reared from 0 day old to 20 weeks of age. Breed differences were observed in the growth parameters. The predicted mature weight of the Hinai-dori was heavier than the other three Japanese native breeds. Tosa-jidori was observed to be late maturing and lighter at maturity, while Ukokkei was shown to have a higher growth rate. The development of growth curves for indigenous breeds may be useful in selecting native Japanese chickens that have rapid growth at early ages.
  Takashi Bungo , Tatsuhiko Goto , Jun-Ichi Shiraishi and Masaoki Tsudzuki
  The objective of the present study was to survey embryonic and chick mortality in native Japanese chicken breeds (Onaga-dori; ONA, Tosa-jidori; TJI, Ukokkei; UKO and Hinai-dori; HNI). The embryonic mortality for each breed was 45.7 (ONA), 51.7 (TJI), 42.9 (UKO) and 26.7% (HNI), throughout the incubation period. The ONA and TJI were found to show high mortality at the early embryonic stage (1-7 days) and it accounted for approximately 70% of total embryonic mortality. In the UKO, high mortality was detected at both the early and late (15-21 days) stages of incubation. Total chick mortalities up to 10 weeks of age were 68.0 (ONA), 62.8 (TJI), 26.4 (UKO) and 6.0% (HNI). In the ONA and TJI, higher mortalities were observed during the 2nd and 3rd week periods of life and reached more than half of their mortalities. The UKO was found to show the highest mortality during the 1st week of life. The HNI exhibited no specific mortality trends throughout the experiment period. These results suggest that embryonic and chick mortalities in Japanese chicken breeds are controlled by genetic factors. Changes in the management routines for each breed might reduce embryonic and chick mortalities and lead to the conservation of these rare Japanese chicken breeds.
  Naoki Goto , Akira Ishikawa and Masaoki Tsudzuki
  A growth curve analysis was performed with 439 F2 birds from an intercross of the Oh-Shamo (Japanese Large Game) and White Leghorn breeds of chickens. Individual body weight and shank length were measured at every week until 16 weeks of age. The Gompertz and Logistic models were examined to verify a proper growth curve function for both body weight and sank length in each sex. To estimate the curve parameters on both function models, the Nonlinear Fit Platform of JMP 5.01 was used. In the mean of both the body weight and shank length within sex, there was no significant difference at hatch. However, the significant differences appeared after 1 week of age and then the level of differences within sex increased by age in both traits. As the results of mathematical function analyses, both models significantly fitted to the actual growth with >0.96 coefficients of determinations (R2) however, the Gompertz model showed slightly better fitting with 0.99 of R2 on all of traits and sexes. Also, the Gompertz model was able to estimate the closer values to actual mature body weight and shank length than Logistic’s one. The estimated inflecting points had no large deference between the Gompertz and Logistic functions. On the other hand, the growth curve for shank length had the inflecting point at younger age (4-7 weeks of age) than the growth curve for body weight (9-11 weeks of age). The growth speed of bone development estimated by the shank growth curve reached the maximum earlier than the body development. It indicated that the bone and the body have different growth patterns. As the results, the Gompertz model might be a proper growth curve function for growth analysis and the different growth pattern between bone and body may induce the detection of QTLs for bone and body development separately.
 
 
 
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