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제주마의 번식과정에 있어서 혈중 Steroid Hormone 수준변화에 관한 연구 1 . 성성열과 발정주기중의 혈중 Estradiol -17β , Progesterone 수준변화
김중계(J . K . Kim),장덕지(D . G . Chang),서문현(M . H . Seo) 한국축산학회 1990 한국축산학회지 Vol.32 No.7
The reproductive status of 428 heads of Cheju pony mares raised on Cheju island was investigated to improve the reproductive efficiency and to get fundamental data for Cheju pony mares. 1. The average ages at the first estrus and the first foaling were 15.1±1.59 and 38.9±5.48 months, respectively, the differences among the feeding farms were great. 2. The average durations of estrus, estrus cycle, gestation period and foaling interval of mares were 5.7±1.81. 20.8±2.42, 333.9±5.41 and 432.6±134.2 days, respectively. 3. The average parturition rate was 60.9% and the differences among the feeding farms were great: The highest parturition rate was 71.4% for Cheju national monumental pony mares. 4. The reccurrence of estrus after foaling excluding and including alternate year foaling were 21.5±19.0, 114.3±133.84 days, respectively. 5. Seasonal variations of estrous mares were 49.4% goes to summer, 45.2% spring, 3.1%, winter and 2.3% autumn.
제주마의 번식상황과 번식장해 원인에 관한 연구 1 . 제주마의 번식상황에 대한 조사 연구
김종계(J . K . Kim),장덕지(D . G . Chang) 한국축산학회 1990 한국축산학회지 Vol.32 No.8
The reproductive status of 428 heads of Cheju pony mares raised on Cheju island was investigated to improve the reproductive efficiency and to get fundamental data for Cheju pony mares. 1. The average ages at the first estrus and the first foaling were 15.1±1.59 and 38.9±5.48 months, respectively, the differences among the feeding farms were great. 2. The average durations of estrus, estrus cycle, gestation period and foaling interval of mares were 5.7±1.81. 20.8±2.42, 333.9±5.41 and 432.6±134.2 days, respectively. 3. The average parturition rate was 60.9% and the differences among the feeding farms were great: The highest parturition rate was 71.4% for Cheju national monumental pony mares. 4. The reccurrence of estrus after foaling excluding and including alternate year foaling were 21.5±19.0, 114.3±133.84 days, respectively. 5. Seasonal variations of estrous mares were 49.4% goes to summer, 45.2% spring, 3.1%, winter and 2.3% autumn.
제주마의 번식상황과 번식장해 원인에 관한 연구 2 . 제주마의 번식장해상황과 원인에 관한 연구
김종계(J . K . Kim),장덕지(D . G . Chang) 한국축산학회 1990 한국축산학회지 Vol.32 No.9
In order to determine ways of improving reproductive efficiency 428 heads of Cheju ponies were investigated. The results are as follows; 1. The total occurrence rate of reproductive disorders for Cheju mares is 41.2%. 24.5% of those investigated showed every other year foaling, 16.7% showed other types of reproductive disorders. 2. The total reproductive disorders of ovarian and uterine diseases were 34 heads(10.9%), and 2 heads(0.6%) respectively. 3. Reproductive disorders of ovarian diseases was 89.5%. Those subdivided into ovarian dysfunction(34.2%), persistent corpus luteum(23.7%), ovarian atrophy(15.8%) and ovarian cyst, delayed ovulation(0.7%). respectively. 4. The dilivery disorders of abortion, dystocia and still-birth were 2.9%. 0.3% and 0.6%. respectively. 5. There were no significant differences in R.B.C, W.B.C, Hb. globulin between pregnant and non-pregnant mares, but albumin phosphorus, glucose in pregnant mares were of higher levels than non-pregnant mares. Generally albumin, Ca, glucose were of lower levels than those reported in other research.
방목 혼파초지에서 Endophyte 감염과 비감염 Tall fescue 품종 차이에 따른 목초생산성 및 토양 이ㆍ화확성에 미치는 영향
김문철(M. C. Kim),현용주(Y. J. Hyun),장덕지(D. J. Chang) 한국초지조사료학회 2003 한국초지조사료학회지 Vol.23 No.4
본 연구는 기호성이 높으며 여름철 고온에 강한 새로운 tall fescue 품종을 구명하기 위해 초지조성 후 5년째인 1997년 방목기간 동안에 북제주군 한림읍 이시돌 목장에서 홀스타인 육성우(방목개시시 체중 110kg 내외)를 이용하여 구당 250㎡(50mx50m)의 면적에서 2처리(T1 = Fawn tall fescue + orehardgrass + peren-nial ryegrass + whitr clover. T2 = Roa tall fescue + orchardgrass + perennial ryegrass + white clover) 3반복으로 시험설계되었다. 방목은 연속방목(3월 22 일~7월 5일 )과 윤환 방목(7월 21일~9월 21일)으로 나누어 실시되었다. 두 가지 톨 페스큐 품종 Fawn(Endophyteinfected)과 Roa(Endophyte feel 간의 초장은 연속방목시 각각 19.10±11.29cm와 13.61±0.97cm를 보였고 윤환방목시 각 각 14.24±2.55㎝와 10.90±1.88cm로서 Fawn 품종구가 Roa 품종구 보다 유의적 증가를 보였다(P< 0.01). 목초 잔존초의 건물수량도 Fawn 11.830 kg/ha Roa 7,896 kg/ha 로서 tall ftscue Fawn이 높은 수량을 보였으며 고도의 유의차를 얻었다(P< 0.01). 시험 처리한 품종 Fawn과 Roa 간 톨 페스큐의 식생구성율 비교에서 3월 22일 시힘 개시시 만 제외하고 6월 21일, 7월 20일 및 9월 21일에 모두 Roa 보 Faw 구에서 높은 경향이었다. 또한 Roa tall fescue는 방목종료시 orchardgras보다 높은 식생구성율을 보이고 있고 혼파초지에서 오차드그라스의 비율을 이는 데 도움되는 경향이 있다. 전 방목기간 중 Roa 구의 CP 항량은 Fawn구 보다 높았으나 통계적으로 유의적 차이를 얻지는 못 했다. 결론적으로 초지조성 5년이 경과되어 tall fescue 비율이 점차 증가되므로 endophyte variety fawn 보다 endophyte free Roa 구에서 목초생산량은 저하되었으나 오차드그라스에 비하여 제주지역의 고온환경에 강한 경향을 보인다.
육우 수정란의 간역동결 및 융해방법에 관한 연구 4 . 내동제에 sucrose 첨가시 간역동결과 식빙방법이 FDA test 에 의한 가토수정란 생존율에 미치는 영향
김중계(J . K . Kim),김철균(C . K . Kim),강만종(M . J . Kang),장덕지(D . J . Chang),김승호(S . H . Kim) 한국축산학회 1988 한국축산학회지 Vol.30 No.10
Effects of simplified procedures of freezing in a liquid nitrogen container and seeding on rabbit embryo survival rates were determined using the FDA test. The results found are summarized as follows: 1. When a single-step addition and removal of a cryoprotectant and a diluent, both containing 10% sucrose was used, seeding with a pincette resulted in a lower FDA test score (2.8) than that without seeding (3.2), but there was no significant differences. 2. Test score was 3.1, 3.2, 3.3 or 3.0 for embryos frozen in a liquid nitrogen container at the rate of 0.3℃, 3^5℃, 15℃/min or frozen in the gas phase 2∼5 mm above the liquid nitrogen and then inserted them into the liquid nitrogen, respectively. No significant differences were found between the freezing methods. 3. The FDA test was considered to be a simple and inexpensive procedure, as compared to the conventional test of embryo survival after culturing in CO₂ incubator.