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.

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.

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.

옥수수 - 계분 silage 의 제조와 사료가치에 관한 연구

고영두(Y . D . Ko),곽종형(C . H . Kwack),송우준(W . J . Song) 한국축산학회 1990 한국축산학회지 Vol.32 No.8

In order to enhance the nutritional value of corn silage, and the utilization of animal waste, sun-dried cage layer excreta was added to whole crop corn. The characteristics of fermentation of the silage was evaluated. In a feeding trial with cow, milk production and the quality of milk were observed. In another feeding trial with sheep, digestibility of the silages and the changes in ruminal fluid were observed. The results obtained are summarized as follows; 1. Cage layer excreta added corn silage showed higher in DM, crude protein and ash content than whole crop corn silage, while crude fibre and NFE were decresed, NDF and ADF were increased in the cage layer excreta added corn silage. 2. The intake of corn silage was higher than that of cage layer excreta added silage, however total dry matter intake was higher in cage layer excreta aded silage when a concentrate was saved by 10 percent, the intake of the silage was significantly increased. 3. There was no significant difference in fat corrected milk production and milk composition among cage layer excreta added corn silage, ordinary corn silage and concentrate saved silage. When the concentrate was saved in corn silage, the milk production was silightly decresed. 4. The digestibility of cage layer excreta added corn silage was significantly(p $lt;.05) improved. 5. pH and VFA of ruminal fluid of the sheep fed cage layer excreta added corn silage were not changed, while the fermentation status in the rumen was improved as a whole. 6. When cage layer excreta was added up to 30% in corn silage, an economic return was greater 331 won per day per head than that of control.

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.