재래산양의 단발정주기중 혈청 Progesterone 및 Estradiol - 17β 의 수준의 변화

송우준,박충생,최상용 ( D . J . Song,C . S . Park,S . Y . Choe ) 한국축산학회 1985 한국축산학회지 Vol.27 No.10

The peripheral blood was collected from 6 Korean native goats which showed a short estrous cycle from 5.5 to 7.0 days. The serum levels of progesterone and estradiol-17β were determined at the interval of 12 hours through the estrous cycle. Using a vasectomized buck the estrous behaviours of the goats were checked twice a day. The average levels of serum progesterone were found lower than 0.02ng/㎖ at Day 0 before and after the short cycle, and increased to 0.14ng/㎖ at Days 2 and 3, and 1.15ng/㎖ (0.57-1.64ng/㎖) at Days 4 and 5. The levels of serum estradiol-17β through the short estrous cycle was fluctuated in a similar pattern to normal estrous cycle. These data suggest that the short estrous cycle may be resulted from the early regression of the premature corpus lutea.

재래산양의 번식의 계절성 및 분만과 유산후의 발정재귀

송우준,박충생,최상용,최경문 ( D . J . Song,C . S . Park,S . Y . Choe,K . M . Choe ) 한국축산학회 1984 한국축산학회지 Vol.26 No.4

To determine the seasonal variations in breeding activity and return to estrus after parturition with or without suckling kids or induced abortion in Korean native goats, thirty primiparous goats of about 2 year old were barn-housed at Gyeongsang National University Farm (N.L.: 35°1`) and allowed with daily supplements of about 200g and liberal feeding of grasses through the experimental period from November, 1982 to October, 1983. The goats were checked twice daily in 12 hours interval for the presence of estrus. The goats were checked twice daily in 12 hours interval for the presence of estrus. The goats were exposed to vasectomized bucks for 30 minutes and the successful mating was identified as a standing estrus. Seasonal patterns for percentage of goats showing estrus behaviors and return to estrus following induced abortion and normal parturition with or without suckling kids were examined. The results obtained were as follows: The monthly percentage of goats showing; more than one estrous behaviour to all the experimental goats available for breeding was highest (94 - 100%) in October to February, lowest (17 - 22%) in July to August, and not varied greatly (58 - 76%) between the other months. These data suggest that Korean native goat may be a typical breed having a very short non-breeding season or showing less fluctuation in breeding activity through the year, compared with other breeds in the temperate region. The successful abortions were induced in all the 5 gnats of 2 - 4 months of pregnancy 30 to 40 hours after intramuscular injection of 3㎎ of PGF₂α Of ten goats which kidded normally, 5 goats were suckled for 60 days and the other 5 goats were separated from their kids 4 days after kidding. The average return interval to estrus after kidding or induced abortion was 12.2±1.2 days, 27.2±7.2 days and 33.0±3.2 days in the group of induced abortion, parturition with and without suckling, respectively. There were significant differences in return period to estrus between induced abortion and parturition with (P$lt;0.05) or without suckling (P$lt;0.01). The short estrous cycles were found after first estrus in all the goats preceded by induced abortion and parturition with suckling, and in the 3 of 5 goats preceded by parturition without suckling.

재래산양의 (在來山羊) 발정유기 및 동기화에 관한 연구

송우준(W . J . Song),박충생(C . S . Park) 한국축산학회 1984 한국축산학회지 Vol.26 No.1

This experiment was conducted to investigate the induction and synchronization of estrus with prosta-glandin F₂α in Korean native goats. Twenty primiparous goats of about 2 years old were barn-housed at Gyeongsang National University farm (N.L.: 35°1`) and allowed with daily supplements of about 200g and liberal feeding of grasses through the experimental period from December, 1982 to August, 1983. The goats were checked twice daily in 12 hours interval for the presence of estrus. The goats were exposed to vasectomized bucks for 30 minutes and the successful mating was identified as a standing estrus. The effects of doses of PGF₂α injection at the various stages of the cycle on the inducing estrus, and the changes in serum progesterone levels following PGF₂α injection at Day 5 or 8 of the estrous cycle (first day of estrus = Day 0) were examined. The results obtained were as follows: The estrus was induced in all the goats which were injected intramuscularly with PGF₂α of 1 ㎎ (6 goats) or 3 ㎎ (7 goats) on Day 8. The interval from PGF₂α injection to the onset of estrus was averaged 52.0±0.2 hours in 1 ㎎ group and 56.6±4.3 hours in 3 ㎎ group. In another experiment, PGF₂α i.m. injection of 3 ㎎ on Days 5, 6, 7, 8 or 12 induced estrus in 83 to 100% of the 5 to 7 goats treated. The interval from PGF₂α injection to the onset of estrus was significantly (P$lt;0.05) earlier in the group of Days 5 or 6 (38.0±2.0 to 38.4±2.4 hours) than in the groups of Days 7, 8 or 12 (52.8±4.8 to 56.6±4.3 hours). The average level of serum progesterone of 3 goats which were injected intramuscularly with 3 ㎎ of PGF₂α on Days 5 or 8 was 2.34±0.89 ng/㎖ in the Day-S group and 3.75±0.26 ng/㎖ in the Day-8 group just before PGF₂α injection. The progesterone level for both group was basal at 24 to 48 hours after PGF₂α injection. However, the progesterone level at 120 hours following PGF₂α injection was significantly (P$lt;0.01) higher in the Day-5 group (1.57±0.19 ng/㎖) than in the Day-8 group (0.24±0.17 ng/㎖). These data suggest that PGF₂α injection to the goats on Day 5 result in significantly earlier ovulation and formation of subsequent corpus lutea, compared to Day 8 group.

Cobalt 가 초생추의 성장에 미치는 영향

고영두,송우준,하정기 ( Y . D . Ko,W . J . Song,J . K . Ha ) 한국축산학회 1975 한국축산학회지 Vol.17 No.1

This feeding experiment was conducted for 6 weeks to study the effect of cobalt supplementation to feed in which the major protein was supplied by either animal or plant sources on growth rate and feed efficiency of young chicks. Day-old 500 female chicks of Fisher line were devided into two groups of animal and plant protein sources, and in each group, five levels of cobalt supplementation (0.0, 0.1, 0.3, 0.6 and 1.0 ㎎/㎏ of feed) were established. The results obtained from this trial were summarized as follows: 1. With the animal protein source, the weight gain obtained with the chicks fed 1.0㎎ of cobalt level was superior to the other, and there was substantial increase in weight gain by feeding cobalt supplemented feeds. 2. With the plant protein source, there were adverse effects on growth rates by feeding cobalt (P$lt;0.05). The growth rates shown with the levels of 0.6 and 0.1㎎ of cobalt were superior to thaw of others. 3. The feed efficiencies achieved by the chicks fed cobalt with animal protein were inferior to those fed cobalt with plant protein, but no statistical difference was found. 4. No toxic effect was observed throughout the experimentation by feeding cobalt supplemented feed.

山羊의 自然 및 誘起發情時 發情週期 및 發情持續時間에 관한 硏究

이지삼,송우준,최경문,박충생,Lee, Ji-Sam,Song, U-Jun,Choe, Gyeong-Mun,Park, Chung-Saeng 한국동물번식학회 1991 Reproductive & developmental biology Vol.15 No.1

This study was carried out to investigate the length of the estrous cycle and duration of estrus in Korean native goats. The effects of the type of last estrus : induced or natural, and the length of preceeding estrous cycle on the subsequent cycle and duration of estrus in goats were also examined. From 481 observations, the mean length of estrous cycles was 18.1${\pm}$0.5days. The cycle length was significantly(P<0.05) shorter following induced estrus (15.2${\pm}$0.8 d) than natural estrus(19.0${\pm}$0.6 d). Significantly higher(P<0.05) incidence of short estrous cycle was observed following induced estrus(40%) than natural estrus(27%). The frequency distribution in the estrous cycle was 30%, 3%, 56% and 11% for short(3-11 d), medium(12-16 d), normal(17-24 d) and long(${\geqq}$25 d), respectively. The most frequent type of short estrous cycle was 6 days in length. Mean duration of estrus was 34.0${\pm}$0.5 h with a range of 18 to 84 h. Duration of estrus was not significantly different the preceeding natural (33.8${\pm}$0.6 h) and induced estrus (34.4${\pm}$1.1 h), and was not significantly affected by the last cycle length. These results suggest that the short estrus cycles are more frequent following induced estrus than natural one, and the duration of estrus are affected greatly by the various intrinsic and extrinsic factors.

한우에 대한 전분박강 silage 급여시험

고영두,송우준 ( Yung Do Ko,Dou Jun Song ) 한국축산학회 1977 한국축산학회지 Vol.19 No.5

To determine the feeding value of sweet potato starch pulp ensiled with 25% barley bran (starch pulp-bran silage) in vinyl trench silo this silage was fed to Korean fattening bulls of about 210㎏ in. body weight for 12 weeks. Four control bulls were fed only mixed concentrates and rice straw but mixed concentrates replaced by 10, 20 or 30% starch pulp bran silage on the basis of air-dry matter were feel to each 4 bulls. The results obtained were as follows: 1. The starch pulp-bran silage was good in quality test at about 60 days after ensiling. The silage was highly palatable to bulls for the whole period of feeding experiment. 2. average daily gain of the bulls fed 10% starch pulp bran silage was 0.8㎏ and a little more than that of controls but there were no significant differences in daily gain between the groups. 3. Digestive crude protein and total digestive nutrients consumed for 1㎏ body weight gain in the bulls fed 10% starch pulp-bran silage were 0.76 and 6.1㎏, respectively and this was the least of the 4 group and those of the bulls fed 30% starch pulp-bran silage was the next in order. However, these were no significant differences in the feed efficiency between the groups. 4. The feed cost for 1㎏ body gain in the bulls fed 30% starch pulp-bran silage was lowest as 530 won, which was 147 won lower than that in controls. Therefore, it was considered that this silage be a economically profitable feed source for fattening bulls.

병아리사료에 밀기울대체로서 말 ( 柳藻 Potamogeton oxyphyllus Mig . ) 의 효과

하정기,송우준,고영두 ( J . K . Ha,W . J . Song,Y . D . Ko ) 한국축산학회 1975 한국축산학회지 Vol.17 No.2

To evaluate the nutritive values of Duckweed(Potamogeton Oxyphyllus Mig.) replacing wheat bran at the level of 4, 6, 8, 10% in the rations of chicks, 150 female chicks of Babcock strain were allotted into four groups. The results obtained from the feeding trial of 8-week period were summarized as follows: 1. No significant differences among the treatments in the growth rates, feed intakes, and feed efficiencies of chicks were found. 2. Economic feasibility data by fixing the cost of Duckweed meal at 17 won/㎏ showed an increasing order of the feed cost required for 8 weeks per chick in the order of 8%, 6%, 10%, 4.0% and control group. 3. No toxic effects were found throughout the experimentation. The colour of faces excreated were appeared to be dark green, when the birds were received Duckweed. It might be, therefore, concluded that the wheat bran in the ration of chicks could be replaced by Duckweed safely and economically up to about 10% of the total ration.

계분의 사료가치에 관한 연구 2 . 육성우에 대한 계분의 사료가치시험

안병홍,이병오,송우준,한인규 ( Byung Hong Anh,Byung O Lee,Ooo Joon Song,In K . Han ) 한국축산학회 1979 한국축산학회지 Vol.21 No.2

To investigate the nutritive value of dried poultry waste(DPW) for the growing steer this experiment was carried out for 3 months from 6, September, 1976 to 4, December, 1976 at livestock farm, Gyeongsang National University. Average initial body weight of growing steer used in this experiment was 135 to 140㎏ and number of steer was 15. The levels of DPW used were 0, 7, 14, 21 and 28%. The results obtained were as follows; 1. Body gain was progressively decreased as the levels of DPW were higher. However, no significant differences were found between treatments. 2. Diet intake was significantly(P$lt;0.01) higher as the levels of DPW were higher. DPW non-supplemented treatment consumed significantly (P$lt;0.01) less amount of diet than treatments supplemented 7, 14, 21, and 28% of DPW. However, there were no significant differences in diet intake between DPW supplemented treatments. 3. Feed efficiency was slightly(P$lt;0.05) decreased as the levels of DPW were higher. DPW non-supplemented treatment was similar in feed efficiency to treatments supplemented 7 and 14% of DPW and was slightly better in feed efficiency than treatments supplemented 21 and 28% of DPW. 4. In economical analysis, feed cost required for ㎏ body gain in DPW non-supplemented treatment and treatments supplemented 7, 14 and 21% of DPW was 495, 486, 479 and 493 Won, respectively. Feed cost of the DPW supplemented treatments was slightly lower than that of DPW non-supplemented treatment till levels of DPW increase from 7 to 21%. However, feed cost of treatment supplemented DPW 28% was 501 Won and higher than that of DPW non-supplemented treatment Therefore, according to this experiment, it may conclude that 14% of DPW can supplement with steer ration without decreasing body gain and feed efficiency of steer and 21% DPW can supplement with steer ration by maximum level without increasing feed cost per ㎏ of diet intake in economical aspect.

한국재래산양의 임신 및 분만전후의 혈중 Steroid Hormone 농도에 관한 연구

최상용,박충생,송우준,김주헌 ( S . Y . Choe,C . S . Park,D . J . Song,J . H . Kim ) 한국축산학회 1986 한국축산학회지 Vol.28 No.6

The peripheral blood was collected from the jugular veins of Korean native goats during gestation and peripartum period. Three goats were selected as samples at every examination designed through the experimental period. The blood samples were centrifuged and stored at -20℃ until hormone assay. The peripheral serum concentration of progesterone was 0.13.03 ng/㎖ at the day of pregnancy and increased greatly to 11.42.44 ng/㎖ at 7 days of pregnancy and thereafter between 9.43 and 14.92 ng/㎖ until 140 days of pregnancy in these 3 goats with an equal gestation period of 145 days, and 8.01±1.67 ng/㎖ at 2 days before parturition, and then declined sharply to 4.60±0.15 ng/㎖, 0.96±0.08 ng/㎖, and (1.37±0.05 ng/㎖ at 1 days and 8 to 0 hours before partiurition and just after parturition, respectively. And this base level of peripheral progesterone concentration was maintained until the Final examination at 6 days after parturition. The peripheral serum concentration of estradiol failed to increase until mid-stage gestation, and thereafter it increased significantly (P$lt;0.05) to 130±25 pg/㎖ at 2 days before parturition and reached a peak of 370±29 pg/㎖ and then declined sharply at 12 hours after parturition. And the base level was maintained until the final examination at 6 days after parturition. There was found a great variation in the peripheral serum level of estradiol between the individuals throughout the gestation period. These results show that the corpus luteum pregnant goats maintain its function normally until 1 to 2 days before parturition and the estradiol may be synthesized in the placenta at increased rate during the late gestation, and its serum level reach to peak just prior to parturition.

볏짚을 이용한 비육우의 all in one silage 제조와 이용

고영두,곽종형,송우준,박구부 ( Y . D . Ko,J . H . Kwak,W . J . Song,G . B . Park ) 한국축산학회 1989 한국축산학회지 Vol.31 No.2

In order to enhance the feeding value of rice-straw, rice straw with different formular of concentrate, rape or formic acid as an additive was ensilaged into and evaluated by laboratory method, and by a feeding trial with finishing Korean native cattle. For the evaluation of the silage quality. rice straw and rape were cut into about 3cm and concentrate levels were adjusted to 20, 30, and 40 percent and kept in a plastic silo of 200㎏ capacity. Rumen solution was taken from sheep by fistulation and used for digestibility and organic acid analysis. For feeding trial, for 90 days, silages with different formula was kept in trench silo and fed to 12 Korean native finishing cattle weighing 256㎏. The results are summarized as follows: 1. Lactic acid fermentation was improved by adding higher proportion of concentrate. 2. Digestible crude protein content was increased in the silages with 0.5 % formic acid or in the silages with higher proportion of concentrates(p$lt;0.05). 3. The pH of rumen solution was decreased in the silage with high proportion of concentrate, while lactic acid content was increased at the same condition(p$lt;0.01). 4. LWG was significantly increased to 0.9 ㎏/day in silage-fed cattle. 5. Total DM intake was significantly increased in cattle on ordinary rice straw and concentrate, however, feed efficiency(feed consumption over live weight gain) were poor(7.46 vs. 6.13). 6. Requirements of DCP and TDN in traditional fed cattle were 0.65 and 4.41 ㎏/LWG㎏ and those in silage fed cattle were 0.50 and 3.71㎏/LWG ㎏, respectively.