• Journal of Animal Science and Technology
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• v.47 no.4
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• pp.593-606
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• 2005

Present study was conducted to investigate the optimal feeding levels for producing the high quality meat on the basis of the information deriving from the comparison of the growth performance and carcass characteristics among breeds(Holstein vs F1, Holstein♀×Hanwoo♂), sex(steer vs heifer) and interaction between breed and sex. Thirty two animals on 4 treatments(i.e. eight head each) were used for 540 days from seven to 24 months of age. The results obtained are summarized as follows; the range of average daily gains was 0.733 to 1.018, 0.994 to 1.255, 0.947 to 1.259 and 0.736 to 0.824kg for the growing, the early-fattening, the mid- fattening and the finishing periods, respectively. The range of average daily gains for the entire period was 0.882 to 1.061kg. The gains were higher for Holstein(7.3%) and the steers(10.5%) than F1 and the heifers, respectively. Concentrates and total digestible nutrients intakes per kg gain were higher for Holstein and the heifers than F1 and the steers, respectively. These findings may indicate that feed utilization is higher for Holstein than F1, and higher for the steers than the heifers. In carcass characteristics, back fat thickness was thicker for Holstein than F1, and rib-eye area was smaller for Holstein than F1. The rib-eye area per kg carcass weight was larger for F1 and the heifers than Holstein and the steers, respectively. Meat color was better for Holstein than F1, but the sex distinction did not show any differences. In physicochemical properties of longissimus dorsi, shear force, cooking loss, water holding capacity and the panel test scores of juiciness, tenderness and flavor for F1 and the heifers were better than those for Holstein and the steers, respectively. According to the above results, we may conclude that F1 and heifers rather than Holstein and steers are recommended for high quality meat production. In steers and heifers of Holstein and F1, the optimal feeding levels may be 1.9% of apparent body weight for concentrates and 25% of concentrates intake for rice straw.

• Journal of Mushroom
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• v.13 no.2
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• pp.129-134
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• 2015

Hybrid strains was selected by crossing between dikaryotic strain ASI 0628 (Dagul) bred from ASI 2596 (Suhan No.3) and ASI 2782(Black pileus mutant) and monokaryotic strain ASI 2344-84. The strain 84 that shown the best cultural characteristics was selected to be a new cytoplasmic hybrid variety and named as 'Chunhwashim'. The 'Chunhwashim' shown incompatibility among them forming the confrontation growth line against parental strains ASI 0628 (Dagul) and ASI 2344 (chunchu 2ho). Fruiting body produced about $161.4{\pm}4.8g$ per bottle. And also the individual generation of fruit body is multiple than chunchu2ho as 40.9. The 'Chunhwashim' was cytoplasmic hybrid included hybrid DNA bands of parental strains ASI 0628 (Dagul) and ASI 2344 (chunchu 2ho) by Random Amplified Polymorphic DNA (RAPD) primer, and mitochondria DNA band of monokaryotic ASI 2344 (chunchu 2ho) using mitochondria microsatellite DNA marker. This new cytoplasmic hybrid variety 'Chunhwashim' of oyster mushroom is characterized by multiple of individual generation and deeply grey color of pileus.

• Journal of The Korean Society of Grassland and Forage Science
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• v.41 no.1
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• pp.41-46
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• 2021

Sorghum×sudangrass hybrid (Sorghum bicolor (L.) Moench, SSH) is one of the most important summer forage crop and it is widely used for silage in Korea. Agriculture is highly dependent on the climate condition and experiencing significant loss of productivity due to climate change. This study was conducted to investigate the correlation analysis between productivity of forage SSH and climatic factors in Central Northern region of South Korea for 3 years (2017 to 2019). Plant height and dry matter yield of SSH were significantly higher in Gyeonggi-do than Ganwon-do. The productivity of SSH is more closely related with temperature than other climatic factors. Maximum temperature and Growing degree days in May and June showed a positive correlation. However, correlation between production of SSH and precipitation was not clear in this study, but rainy days showed a negative correlation (0.42). In conclusion, temperature is most important climatic factor to the maintenance of plant yield.

• Proceedings of the Korean Society of Crop Science Conference
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• 1978.04a
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• pp.22-22
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• 1978

• Journal of Sericultural and Entomological Science
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• v.36 no.2
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• pp.97-101
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• 1994

The fertilities of pyloploidy mulberries and the germination abilities and shape of poliploidy mulberry seeds fructified by natural cross were investigated and the results are as follows. Regarding the size of seeds, that of the tetraploid was the biggest and that of hexaploid was the smallest among the investigated polyploids. Those of diploid and triploid ranged between those of tetraploid and hexaploid. The fertilization rates of the varieties of Shinkwangppong and Cheongunppong, which were triploid, were 25.4 and 55.0%, respectively, and Shinkwangppong showed 10.2% of cross rate, but Cheongunppong did not have germination ability. The tetraploid seeds showed 61~68% of fertility and 30~54% of cross rate. The Puksan No. 2, which is hexaploid, had about 43% and 7% in fertility and cross rate, respectively. The germination abilities of floating seeds of diploid and tetraploid were comparatively high, but the floating seeds of triploid and hexaploid did not have germination ability. The seeds of diploid had a high fertility of 81~95% and a comparatively high cross rate of 47~74%.

• Korean Journal of Microbiology
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• v.39 no.2
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• pp.114-117
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• 2003

In molecular biology, it is necessary to develop an easy and rapid method to identify a specific DNA sequence. Though Southern and Northern blot techniques have been used widely for the analysis of gene structure and function, those methods are inconvenient in the points that we need to control incubation temperature, time, and other parameters to get the final result. In this study, we report a new method for the rapid analysis of specific DNA sequence with the modification of an immunochromatographic method. The lateral flow DNA analysis strip is composed of a sample pad, a nitrocellulose membrane for the separation and propagation of analytes, and an absorption pad for the generation of capillary action. Capture DNA was immobilized on the membrane by UV cross-linking and target DNA was labeled with Cy-5 for signaling. The samples containing target DNA were applied onto the sample pad, incubated for 15 min for separation, and scanned with a GSI fluorescence scanner. Though the hybridization reaction occurs in a short time without any washing steps, there appears to be little cross hybridization between the different sequences. The result showed a possibility that the new method can be used for the rapid identification of specific DNA sequence among the samples.

• Journal of Sericultural and Entomological Science
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• v.18 no.2
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• pp.101-105
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• 1976

The study was carried out to investigate the variations in the fibroin hydrolysis of leading silkworm varieties in Korea, and the relationship between the fibroin hydrolysis of the silkworm varieties with some characteristics and silk morphological property. The results obtained are summarized as follows: 1) The fibroin hydrolyzing ratio of both parent silkworm cocoons was reduced in the F$_1$hybrids. 2) A positive corelation (r=＋0.86) was approved between the mid-parent value and the F$_1$hybrid in the fibroin hydrolysis. 3) It was disclosed that the fibroin hydrolyzing ratio of Jam 103${\times}$Jam 104 was the lowest among the leading silkworm F$_1$hybrids. 4) The fibroin hydrolysis was affected by the silk morphological property, showing a positive corelation between the size of cocoon filament and the fibroin hydrolyzing ratio. 5) It was thought that the determination of the fibroin hydrolyzing ratio was useful as a marker for the selection of its related economical characters in silkworm breeding, because the fibroin hydrolysis of parents silkworm cocoons was heritable in their F$_1$hybrids.

• Journal of the korean veterinary medical association
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• v.18 no.7
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• pp.64-73
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• 1982

This experiment was conducted to determine the age and weight at first estrus and to characterize the serum LH, FSH, prolactin, progesterone and estradiol during growth and puberty in Korean native heifers and Charolais x native crossbred heifers. Four pu

• Journal of fish pathology
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• v.25 no.3
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• pp.221-229
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• 2012

Hybrid of red seabream (Pagrus major) and Japanese red seabream (Pagrus major) grew rapidly from to August (WT $19.7^{\circ}C{\sim}24.0^{\circ}C$) while black seabream (Acanthopagrus major) did from September to October (WT $19.9{\sim}23.0^{\circ}C$). Survival rate of hybrids (85.5%) was a significantly higher than those of the other fish species (20%). Green liver syndrome were observed in black sea bream and Japanease red seabream but did not in hybrids. Microcotyle tai infected 0~90% in hybrid, 20~100% in red seabream, 10% in black sea bream and 20~100% in Japanese red seabream but no significant difference was found among each fish species.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.27 no.2
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• pp.111-115
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• 1982

The trials were carried out for improvement of early maturing wheat varieties, desease resistant and good quality through transfering good characters of barley to the wheat, during 1980-'81. For these purpose, Chinese Spring, a wheat variety was used as male and Manker 16 a barley variety, as female parents. EACA($\varepsilon$-Amino Caprolic Acid) known as an inhibitor of blood coagulation was injected to all barley from 14 days until heading with 1$m\ell$ per culm at the level of 500ppM. $GA_3$ solution which accelerates pollen activity was also used with 75ppM concentration after pollination for two days including check to determine the single effect of EACA. Two different methods of the cross were used. One was bud-pollination, another was post-pollination. The result indicated that the post-pollination was better than bud-pollination in terms of pollination rate, even though formation rate of normal embryo was seemingly adversed. The new plant derived from barley-wheat cross was similar in phenotype to the wheat.