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Histochemical study on the tracheal development in fetuese and neonates of Korean native goats
1997
Kim, C.S. (Gyongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
Development on the esophagus of fetuses and neonates in Korean native goats
1994
Jung, S.H. | Kim, C.S. | Huh, C.K. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
Effect of embryo and recipient condition on pregnancy rate following bovine embryo transfer
1989
Lee, J.H. (Korea Embryo Transfer, Seoul (Korea R.). Veterinary Clinic) | Park, H.K. (Kyongbuk National Univ., Taegu (Korea R.). Coll. of Agriculture) | Shin, S.T. (Seoul National Univ., Suwon (Korea R.). Coll. of Veterinary Medicine)
This study was carried out to determine suitable selection factors for recipients and embryos which could improve pregnancy rates following bovine embryo transfer. The experiment included 52 surgical transfers from February, 1985 through June, 1986 performed on Kyongbuk Breeding Center in southern Korea. The pregnancy rate was highest when recipients were in estrus within 6 hours before the donor to 12 hours after the donor (78.3 % versus 50 % for recipients in estrus earlier or later). Pregnancy rates were acceptable following culture under field conditions for up to 17 hours. More recipients over 15 months of age (76.1 %) remained pregnant than those under 15 months (66.7 %). Embryos transferred during the months from February to July resulted in higher pregnancy rates than those transferred during the remaining 6 months (77.3 % versus 57.1 %). Transferrable embryos were classified A (best) to C (worst); those graded A or B resulted in significantly higher pregnancy rates than those graded C (81.8 % and 73.3 % versus 25.0 %, p0.05). Pregnancy rates among recipients of the Korean native breed tended to be higher than among Holstein recipients (100 % versus 71.1 %). Similarly, when the embryo was transferred to the right uterine horn, pregnancy rates tended to be higher than when it was transferred to the left (81.3 % versus 65 %). Pregnancy rates did not differ according to the stage of development of the embryo; they were for morulae, tight morulae, blastocysts, and advanced blastocysts, respectively : 75.0 %, 66.7 %, 75.0 %, and 77.4 %
اظهر المزيد [+] اقل [-]Studies on nuclear transplantation in mouse embryos - (2) - Developmental potential of nuclei from embryos of different developmental stages
1990
Park, C.S. | Park, H.S. (Gyeongsang National University, Chinju (Korea Republic). College of Agriculture) | Choe, S.Y. | Lee, H.J. (Gyeongsang National University, Chinju (Korea Republic). Department of Veterinary Medicine)
Effects of stage and quality of embryo, synchrony between donor and recipient and difficulty of transfer on pregnancy rate following non-surgical transfer of frozen-thawed bovine embryos
1989
Lee, E.S. | Jo, C.H. | Hwang, W.S. (Seoul National Univ., Suwon (Korea R.). Coll. of Veterinary Medicine)
This study was performed to investigate the effects of stage and quality of embryo, synchrony between donor and recipient and difficulty of transfer on pregnancy rate following non-surgical transfer of frozen-thawed bovine embryos. The overall pregnancy rate of this experiment was 63.4 % and that of heifers (73.1 %) was higher than that of cows (46.7 %). The pregnancy rates of recipients transferred with morulae, early blastocysts and blastocysts were 50.0 %, 64.7 % and 71.4 %, respectively. The pregnancy rate of recipients transferred with good embryos (67.9 %) was higher than that of recipients transferred with fair embryos (53.8 %). The pregnancy rates of embros transferred to left and right uterine horn were 63.2 % and 63.6 %, respectively. The pregnancy rate of recipients in estrous synchrony 0 (76.2 %) was higher than those of recipients in synchrony -1 (55.6 %) and +1 (44.4 %). The pregnancy rate of recipients transferred with 2 embryos (71.4 %) was higher than that of recipients transferred with 1 embryo (61.8 %). The pregnancy rate of embryos transferred to uterine tip (72.0 %) was higher than that of embryos transferred to uterine base (50.0 %). Ease of transfer was ranked to a scale of one to three on the basis of increasing difficulty. Transfers ranked as ease score 1 accounted for 77.8 % of pregnancies and had higher pregnancy rate than ease score 2 (66.7 %) or 3 (45.5 %). The pregnancy rate of recipients with excellent corpus luteum (CL) (70.0 %) was higher than those of recipients with good CL (61.1 %) or fair CL (61.5%). In reviewing above results, it was considered that the factors such as embryo stage, embryo quality, estrous synchrony, corpus luteum quality, tranfer site within uterus, recipient's parity and ease score affected the pregnancy rate after non-surgical transfer of frozen-thawed bovine embryos
اظهر المزيد [+] اقل [-]Histochemical and electron microscopical study on the tracheal development in fetuses and neonates of Korean native goats 1. Light microscopic, scanning and transmission electron microscopical studies
1997
Kim, C.S. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
Development of the body of axis and lst cervical intervertebral disc in the Korean native cattle fetus
1997
Lee, H.R. | Ahn, D.C. | Kim, I.S. | Yang, H.H. | Paik, Y.K. (Chonbuk National University, Chonju (Korea Republic). College of Veterinary Medicine)
Development on the rumen of fetuses and neonates in Korean native goats
1994
Huh, C.K. | Kim, C.S. | Kwak, S.D. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
Development on the reticulum of fetuses and neonates in Korean native goats
1994
Huh, C.K. | Kim, C.S. | Jung, S.H. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
Effects of clomiphene citrate on ovarian function and embryo developmental capacity in the rat
1992
Yun, Y.W. (Chungbuk Nat'l Univ., Cheongju (Korea Republic). Dept. of Veterinary Science) | Kwun, J.K. (Seoul Nat'l Univ., Suwon (Korea Republic). Dept. of Physiology)