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제주한우 개량에 관한 연구 Ⅱ. 제주한우 집단개량 실태조사
김동철(D . C . Kim),이희석(H . S . Lee),백윤기(Y . K . Baek),이승협(S . H . Lee) 한국축산학회 1984 한국축산학회지 Vol.26 No.2
The objective of this survey was to study the genetic performance of Cheju native cattle under rural conditions from 1965 to 1983. 2,666 head of the total cattle population estimated at 27,400 head were classified into breeds and crossbreeds. 509 cattle were classified according to frequency of coat color and 304 according to body weight and size. 1. The percentage of each breed in the 2,666 head of cattle under investigation was as follows. Cheju native, 42% exotic beef breeds 1.4%. Cheju native x Brahman crossbreed 75.7% and other crossbreeds 8.7%. 2. Average body weight of Cheju native cattle crossbreeds was from 260.1 ㎏ in 1965 to 274.2 ㎏ in 1982. In 1982 the average body size of Cheju native cattle was 3.1-16.9㎝ longer than in 1965. The only exception was the pin-bone width which was shorter than in 1965. 3. The average body weight of cows in each breed was Cheju native 274㎏, Brahman x Cheju. 241㎏ and Brahman x F₁(Brahman x Cheju native) 378㎏ (P $lt; 0.01). The average withers height, body length and chest girth were 120.2㎝, 139.5㎝ and 170.8㎝ respectively. Brahman x Cheju native and Brahman x F₁ (Brahman x Cheju native) however, had greater measurements to that of the average, but Cheju native body size definitely under the average. 4. The average body weight of 3 to 4 years old cows 53㎏ less than average body weight of 3 to 9 years old cows, which was 331㎏. But it was greater than the average body weight of 5 years old cows. 5. Body weights vary according to coat color was not different from each other. None of the differences was statistically significant. 6. The most usual coat color of Cheju native cattle was yellowish brown(69%), black(17%); the predominant coat color of Brahman x crossbreeds was white and grey.
단일 바이어스 회로를 이용한 다채널 전해질 이온 농도 측정 시스템의 개발 및 측정의 신뢰성 향상
최정태,이승협,김영진,이영철,조병욱,손병기 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
On this research 8-channel ISFET electrolyte measurement system with a single signal detecting circuit and appropriate software program have been developed to improve the reliability. Microprocessor(80C196KC) controlled the electric switch(AD201) to connect a signal detecting circuit with 8 sensor channels, which made it possible to reduce the size of system and lower the cost and power consumption. System software program consists of "calibration", "measurement" and "unreliable channel exclusion" routines. Developed electrolyte measurement system can measure 4 different ion (H^(+), Na^(+), K^(+), Ca^(2+)) concentration and its performance has been evaluated.
제주혼파초지에서 하고기 예취시기와 질소시비수준에 따른 목초생산의 계절적 변화
김문철,김영휘,조남기,이수일,이승협 濟州大學校 農科大學 動物科學硏究所 1993 動物科學論叢 Vol.8 No.1
To study management practices suitable for the least production loss of temperate pasture under summer stress. two different cutting dates (late June and mid July) under summer stress and five different nitrogen treatment application levels (0. 100. 200. 300 and 400 kg/ha) were tried during the trial period between Oct. of 1986 and Oct. of 1989. The late June cutting showed a statistically significant increase of dry matter yield of pasture in comparison with the mid-July cutting( P<0.05). Nitrogen application also gave significant increase in dry matter yield. Botanical composition at the 4th cuttings in 1988 and 1989 was dominated by weeds to the level of 50%. Application of nitro-gen at 200 kgs per ha was found to be the best with production of grasses at 70%. legumes at 10% and weeds at 20% in botanical composition comparison of pastures at the 4th cutting time the last year. showing a great decrease of weeds. K contents of pasture in June cuttings showed to be more than them in July cutting. and N and Na contents increased with increases of the nitrogen application level. It was concluded that treatment with June cutting and nitrogen application of 200kg per ha was a way to keep temperate pasture from summer stress in the Cheju area.