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사료급여방법이 제주재래마의 체성장 및 도체품질에 미치는 영향
오운용(W . Y . Oh),강태홍(T . H . Kang),김동철(D . C . Kim),진신흠(S . H . Jin),홍성귀(S . K . Hong),양승주(S . J . Yang),정재홍(J . H . Jung) 한국축산학회 1993 한국축산학회지 Vol.35 No.6
Nine Cheju Native Horses with an average weight of 169.2㎏ were used in a 238-d (34-wk) fattening trial designed to evaluate the effects of feeding method on growth performance and carcass characteristics. Horses were randomly alloted to three treatment groups: T₁ 6-wk (Former fattening period: FFP) + 28-wk (Latter fattening period: LFP), T₂, 9-wk (FFP) + 25-wk (LFP), T₃, 12-wk (FFP) + 22-wk (LFP). During the FFP, concentrate was restricted at approximately l.5% of their body weights but horses were allowed ad libitum access to concentrate during the subsequent LFP. The horses were individually penned in 2.5-m×3-m pipe stalls with front feeding gates. They were allowed 3 h of exercise in a pen (50-m×30-m) outside the barn monthly. Horses were weighed at 30-d intervals and feed consumption was measured daily. At the end of the 238-d fattening period, one horse in each treatment was selected randomly and slaughtered for meat quality evaluation. Results obtained from the present study were summarized as follows; during the overall fattening period, average daily gains (ADG) and nutrient intake (TDN) per ㎏ wt, gain were 0.59, 5.10(T₁), 0.51, 5.84(T₂) and 0.43, 6.37㎏(T₂), respectively. When horses were allowed ad libitum access to concentrate for 28 wk(T₁), ADG and feed efficiency(TDN) were improved by 37%(P$gt;.05) and20%(P$gt;.05)compared to those allowed concentrate free choice for 22 wk(T₃). Horse in T, group had an improved dressing percentage and carcass weight with good quality grades(intramuscular fat, meat color, fat color). Taste panelists(150 amateures) detected no difference from longissimus lumborum steaks between Cheju Native Horse and improved Cheju Native Cattle, but found juiciness and meat flavor were superior to those of beef.
초지 및 사료작물 : 한우 , 제주재래흑우 , 흑모화우와 갈모화우에서의 MSH Receptor ( MC1R ) 유전자의 유전자형 및 빈도 비교
이성수(S . S . Lee),양영훈(Y . H . Yang),강승률(S . Y . Kang),오운용(W . Y . Oh),양보석(B . Y . Yang),고서봉(S . B . Ko),오성종(S . J . Oh),김규일(K . I . Kim) 한국축산학회 2000 한국축산학회지 Vol.42 No.3
PCR-RFLP analysis of MSH receptor (melanocyte-stimulating hormone receptor; MCIR) gene was carried out to confirm the genotypes and frequencies in Korean Cattle, Cheju Native Black Cattle, Japnaese Black, Japanese Brown, Holstein and Angus. Genetic relationship of these breeds and coat colors to alleles at the Extension locus, that encodes MCIR were also determined. Allele E^D E^+ and a were detected by digestion with BsrF I (or Msp I ) and Aci I . A Dominant allele E^D, which is considered to be typical allele for dominant black coat color in cattle breeds, such as Holstein and Angus, was not detected in Korean Cattle and Japnases Brown with yellowish-brown coat color. Among sixty-two Cheju Native Black Cattle and fifteen Japanese Black, only ten and eleven heads had the dominant allele E? respectively. The remaining animals possessed the genotype E^+/E^+ or E^+/e, which probably reflect alleles at the A-locus which are supposed to give rise to the recessive black color. Several animals of Cheju Native Black Cattle and Japanese Black possessed the genotype E^D/-, probably reflecting the genetic introgression of E^D allele into these breeds during the crossbreeding period for improving. These results show that the difference of MCIR genotype and frequency among these breeds may be useful for conservation of endangered Cheju native Black Cattle and also genetically discreminating between meat of Korean Cattle and that of Holstein
유전 및 육종 : 칡소와 비경흑색 한우의 Melanocortin Receptor 1 ( MC1R ) 유전자형 분석
이성수(S . S . Lee),양보석(B . S . Yang),양영훈(Y . H . Yang),강승률(S . Y . Kang),고서봉(S . B . Ko),정진관(J . K . Jung),오운용(W . Y . Oh),오성종(S . J . Oh),김규일(K . I . Kim) 한국축산학회 2002 한국축산학회지 Vol.44 No.1
PCR-RFLP analysis was carried out to investigate the genotype of Melanocortin receptor 1 (MC1R) gene in Korean Brindle Cattle and Korean Cattle with dark muzzle, which are coat color and muzzle pigmentation variants of Korean Cattle, respectively. Allelic variants of MC1R in cattle were analyzed by digestion with BsrFⅠ, AciⅠ. Among six genotypes, E^D/E^D, E^D/E^+, E^D/e, E^+/E^+, E^+/e and e/e, detected in cattle, only two genotypes, E^+/E^+ and E^+/e, were observed in Korean Brindle Cattle, probably reflecting the necessary of E^+ allele for the expression of black brindle coat color. As in Korean Cattle with light muzzle, the E^+/e and e/e genotypes were detected in Korean Cattle with dark muzzle. The E^+ and e alleles frequencies in two populations of Korean Cattle with dark muzzle and with light muzzle were 0.37, 0.63 and 0.11, 0.89, respectively. Although the frequency of E^+ allele in Korean Cattle with dark muzzle was higher than in Korean Cattle with light muzzle, the E^+ allele was not completely associated with dark muzzle pigmentation. The results of this experiment indicate that the difference of MC1R genotype and frequency may be useful for fixation of coat color in Korean Cattle as well as Korean Brindle Cattle.