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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.