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Articles by Takao Oka
Total Records ( 4 ) for Takao Oka
  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.
  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.
  Natsuki Fukano , Natsuho Wada , Takao Oka and Takashi Bungo
  The aim of the present study was to evaluate effect of a new manual restraint test for the detection of fearfulness on the blood parameters in hens. Each chicken was held in an underarm with mild pressure, whereas the other hand was used to restrain the legs. Thereafter, latencies to the first struggle and frequencies of struggling were recorded for 5 min. At the end of the test, the blood samples were collected. At one week after the test, their bloods were collected again as control. Median of latency (sec.) or frequency (number) of struggling in laying hens was 116.0 and 4.5, respectively. No significant differences were detected in the levels of glucose and FFA by manual restraint while the level of corticosterone just after the test was higher than that at one week after the test. These findings demonstrate that the newly developed restraint test is useful for detecting fearfulness in chickens.
  Takao Oka
  Objective: This study investigated the morphological traits and growth patterns for two lines of Oh-Shamo. Methodology: A total of 31 offensive (OFF) line (17 males and 14 females) and 32 defensive (DEF) line (17 males and 15 females) were used. The body weight of each individual was recorded every week from hatching to 30 weeks old. In addition to measuring body weight, growth curves were estimated using the Gompertz function. Eight somatometrical measurements were recorded every 5 weeks. Results: It was shown that the estimated asymptotic body weight and somatometrical measurements in OFF line were larger than those in DEF one regardless of sex. It was found that significant increases of lengths in femur, tarsometatarsus and tibiotarsus in OFF males were longer than others (p<0.05) and the body weight and length/diameter of each body part in OFF groups was more than those in DEF ones and those in males were higher than in females (p<0.01). The lengths of tibiotarsus and tarsometatarsus were estimated as hypogrowth in the OFF male group, but as tachyauxesis in the DEF female group. Conclusion: These results suggest that there were significant differences between OFF and DEF in their somatotypes, especially in the tibiotarsus.
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