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RISS 인기검색어
- 검색키워드
- 저자 : 백윤기(Y . K . Baek) (검색결과 2 건)
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제주한우 개량에 관한 연구 1 . 제주한우 , Brahman , Santa Gertrudis 및 교잡종의 번식상황에 관한 통계학적 연구
김동철,이희석,백윤기,김중계 ( D . C . Kim,H . S . Lee,Y . K . Baek,J . K . Kim ) 한국축산학회 1982 한국축산학회지 Vol.24 No.6
The objectives of this study were to determine by experimental results the age at first calving, gestation length and calving interval of Jeju native, Brahman, Santa Gertrudis and crossbreeds. Data were analysed by the least square method, from 582 cows fed at Jeju Experiment Station from 1961-1980. 1. The average age at first calving of Jeju native, Brahman and Santa Gertrudis was 41.9, 42.8 and 39.8 months respectively. The average age at first calving of Brahman × Jeju native and Santa Gertrudis was 39.1 and 42.1 months. 2. The average gestation length of Jeju native, Brahman and Santa Gertrudis was 285.9, 286.2 and 284.7 days respectively. The average crossbreeds gestation length, however, was longer than their parents with an increase of 1% in Brahman × Jeju native and 4% with Santa Gertrudis × Jeju native cattle. 3. The average calving interval of Jeju native, Brahman and Santa Gertrudis was 384.7, 465.9 and 501 days. Crossbreeds, however, have shorter calving intervals than their parents with an increase of 5.3% in the case of Brahman × Jeju native and 6.4% with Santa Gertrudis × Jeju native cattle (P$lt;0.01). 4. Gestation length was longest when dam was 8-9 years old (P$lt;0.05) but calving interval declined as parity increased.
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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.
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