Two experiments were conducted to determine the effect of wood vinegar (WV) on the fecal microbes and gas emission in weaned pigs. In Exp. 1, 224 weaned piglets (L×Y×D, 21 d-old, initial BW 6.02 ± 0.52 kg) were assigned to four treatments of different WV levels in randomized completely block design with four replicates (14 piglets/pen) for 28 days, including phases I (0-2 wk) and phase II (3-4 wk). The dietary treatments were 0, 0.1, 0.2 and 0.3% of WV added to a corn-soybean meal basal diet. The concentration of ammonia measured at 0 h and 24 h in feces did not differ among dietary treatments (p>0.05), but it was linearly decreased (p<0.05) in 0.2% and 0.3% addition level measured at 48 h and 72 h. The concentration of hydrogen sulfide had no significant change (p>0.05) within treatments measured at different time. The fecal total bacteria (TBC), Lactobacilli(LAB) and E. coli were measured on 14 d and 28 d. TBC were higher (p>0.05) in WV added treatments than the control. Similar results were obtained for LAB. But E. coli populations were decreased (p<0.05) in treatments added WV compared to control measured on 14 d and 35 d. In Exp. 2, 288 weaned piglets (L×Y×D, 21 d-old, initial BW 6.62 ± 0.31 kg) were assigned to four treatments in a randomized completely block design with four replicates (18 piglets/pen) for 28 days. The dietary treatments were basal diet (negative control, NC), 0.2% organic acid (positive control, PC), 0.2% antibiotic (AT) and 0.2% WV added to a corn-soybean meal basal diet. The fecal total bacteria (TBC), Lactobacilli(LAB) and E. coli were measured on 14 d and 28 d. TBC, LAB and E. coli showed lower counts in pigs fed AT diets than others. In conclusion, these results indicated that wood vinegar could reduce the NH3 concentration of feces and inhibited the growth of harmful bacteria.

This study was conducted to determine the replacement effect of spray dried plasma protein (SDPP) with dried porcine solubles (DPS) in weaning pigs. An ileal digestibility trial, at first, was conducted to formulate the experimental diets with SDPP or DPS. Six piglets (21-d old and 6.12kg BW) with T -cannula in the terminal ileum were used. In a feeding trial, 180 pigs (21-d old and 5.98kg BW) were alloted in a completely randomized block design. Treatments were T1 (SDPP 5%, DPS 0%), T2 (SDPP 5%, DPS 2.5%), T3 (SDPP 2.5%, DPS 0%), and T4 (SDPP 2.5%, DPS 2.5%) for phase I, and T1 (SDPP 3%, DPS 0%), T2 (SDPP 3%, DPS 1.5%), T3 (SDPP 1.5%, DPS 0%), and T4 (SDPP 1.5%, DPS 1.5%) for phase Ⅱ. Phase Ⅰ(0～1 week) diet was formulated to contain 3,300ME kcal/kg and 1.25% digestible lysine, and phase Ⅱ (2～3 week) diet contained 3,320ME kcal/kg and 1.10% digestible lysine. Chemical pompositions of the protein sources were higher in SDPP than DPS: CP (81.60 vs. 56.01), lysine (5.95 vs. 3.36), and methionine (1.85 vs. 1.22). Apparent ileal digestibilities of arginine, isoleucine, leucine, lysine, methionine, threonine and phenylalanine were higher in DPS than SDPP (p<0.05). The apparent ileal digestibility of essential amino acids (average) was also higher in DPS than SDPP (p<0.05). There were no significant differences (p>0.05) in ADG and ADFI of piglets during phase Ⅰ (0～1 week) and Ⅱ (2～3 week) among treatments. However, during phase Ⅱ, T2 showed better FCR than T1 (p<0.05). During the overall period, there was no significant difference in growth performance among treatments. When DPS was partially replaced for SDPP, the diet cost was significantly reduced (p<0.05) in terms of cost/kg of body weight. In summary, the digestibility of DPS was exellent, and it would be concluded that DPS can be partially replaced in the young pigs' diet containing SDPP in order to reduce diet cost in weaning pigs.

본 연구는 분만시 동복 신생자돈의 제대혈에서 추출한 genomic DNA를 PCR-RFLP 기법을 이용하여 농가수입증대를 위하여 육질이 불량한 PSS 돼지를 판별하는 방법을 개발하기 위한 기초실험으로써 그 결과를 요약하면 다음과 같다. 자돈 제대에서 혈액 genomic DNA를 추출하여 PCR에 의하여 증폭된 ryanodine receptor gene 영역의 산물은 자돈의 제대혈에서 1.8kb의 길이로 증폭되었음을 확인하였다. 제대혈에서 추출된 DNA 의 PCR 증폭 단편을 가지고 Hha I 제한효소로 digest 하여준 결과에서 PSS 돼지는 Yorkshire 종에서 출현하지 않았으나, Landrace 종과 Crossbred 종에서 각각 4.76%와 7.14%로 교잡종(LYD 또는 YLD)에서 더욱 많이 출현되었다. 이상의 결과로 볼 때 분만시 신생자돈의 제대혈을 채취하여 PSS 돼지를 조기에 선발하면 스트레스 감소는 물론 혈액채취의 간편성을 기대할 수 있을 것으로 판단된다.

This study was conducted to determine the main effects of the parity and farrowing season on gestation length and newborn pigs on the basis of the data obtained from 234 litters of Landrace breeds raised at an integrated swine farm in Kyunggy province from January 1991 to December 1992. The results obtained are summarized as follows ; 1. The average gestation length was 115.37 days, and 114.64 days of 8th parity and over was shorter than those of other parities. 2. The averages of litter size and litter size alive per sow were 9.91 and 9.50 heads. The litter size horn at 1st parity was smaller than at other parities, and the litter size in spring was larger than in summer, autumn or winter. 3. The averages of birth weight per litter and pig were 13.53 kg and 1.37 kg. The effect of farrowing season for each litter weight(p<0.01) and pig weight(p<0.05) at birth was significantly higher in spring than other seasons. 4. Incidence of malformation and stillbirth at birth was 4. 10%, and it at 8th parity and over showed the highest rate(7.50%).