This study was conducted to clarify behavior and body weight of weaned piglets between different social experiences during suckling period. Control (no social experience) and treatment (social experience) groups of weaned piglets were housed and observed with the aid of video technology for 8 consecutive hours in early (days 1 and 2) and late (days 22 and 23) periods after mixing. Inactive, locomotion and exploration were significantly different between control and treatment groups in early mixed period. Feeding differed between groups in late mixed period. In social behaviors, agonistic and interaction with adjacent pen were significantly higher in treatment group than in control group during early mixed period. However, social behaviors dramatically decreased in late mixed period. There was negative correlation between average daily gain of body weight and agonistic behavior. In social experienced weaned piglet groups, there were less agonistic behavior and more daily gain of body weight in this study. Social experience during suckling period would be useful for stable group management in swine industry.

사료이용 측면에서 유지 및 성장에 필요한 섭취량과 체내에 이용되지 않은 섭취량으로 구분할 수 있 으며, 체내에 이용되지 않은 섭취량을 잔류사료섭취량(Residual Feed Intake; RFI)이라 한다. 본 실험 은 국내 종돈의 RFI 유전모수를 추정하기 위해 2001년부터 2014년까지 태어난 Duroc종 8,696두의 검 정자료를 활용하였다. 일당증체량과 RFI의 육종가 상관관계는 -0.2로 음의 상관으로 조사되었는데 (P>0.01), RFI를 낮추면 일당증체량 개량에도 긍정적인 영향을 줄 수 있는 것으로 사료된다. 회귀추정 방식에 따른 RFI1(일당증체량)과 RFI2(일당증체량, 등지방두께)의 유전력은 각각 0.37, 0.45로 고도의 유전력을 나타내었다. 향후 국내에서도 개체단위 사료섭취량 측정으로 추정된 RFI를 개량에 활용한다면 농가 수익 개선에 많은 도움을 줄 수 있을 것으로 판단된다.

The aim of this study is to examine current status of swine AI and boar stud in South Korea using survey and data analysis. This survey included 48 boar studs registered as ‘semen processing business’. The survey data were collected by direct visitation, FAX and/or telephone conversation for 7 months from June through December in 2013. 48 boar studs owned a total of 3,537 boars and the Duroc breed accounted for the highest rate (75.3%) of all boar breeds. In case of ownership, agricultural management corporations was the highest (50.0%) and followed by individual ownership (33.3%). Large-scale boar studs in terms of own over 151 boar were surveyed as 4.2% and most boar studs owned less than 100 boars (77.1%). The amount of liquid semen provided by 48 boar studs were 1,889,000 doses and each boar stud provided average of 39,000 does, which is represented for 90% consumption by sows in South Korea.

혈청 내 존재하는 효소 중 Glutamic pyruvic transaminase(GPT)는 근육이나 간세포의 손상에 대한 임상 화학적 지표로 사용 된다. 본 연구는 Landrace와 한국재래돼지의 F2 교잡 축군(N=1,105)에 대해 Porcine SNP 60K beadchip을 사용하여 유전자형 분석을 실시하고, GPT 형질과의 관련성을 검증하기 위해 Genome-Wide Association Study(GWAS)를 수행하였다. F2 교잡축군의 가계구조를 보정한 GWAS를 수행하기 위하여 혼합모형과 회귀분석을 조합한 GRAMMAR방법을 관련성 분석에 사용 하였다. 유의성 있는 SNP 표지들은 Sus scrofa chromosome(SSC) 6, 7, 그리고 13에서 동정되었다. 이들유의성 있는 SNP marker들에 가장 근접한 염색체상 위치의 유전자를 그 유전자의 기능을 고려하여 SSC7에서 2개의 위치후보유전자(BCL11B, AHNAK2)를 선정하였다. Pyrosequencing법을 통하여 이 들유전자 내에 존재하는 4개 SNP 표지들의 유전자형을 분석하여 GPT 형질간의 관련성 분석에 이용하였다. 관련성 분석결과, BCL11B g.267 T>C에서 nominal P=7.23×10-8 과 AHNAK2 g.1439 C>T에서 nominal P=5.64×10-6, g.1736 C>A에서 nominal P=3.51×10-6의 결과를 얻었다. 이 들 중 가장 유의한 결과를 얻은 BCL11B 유전자의 g.267 T>C SNP 표지는 추가 연구를 통하여 혈청 GPT 변이에 영향을 미치는 위치상 후보 유전자 표지로 사용 되어 질 수 있을 것이라 사료되어진다.

The objective of this study was to compare the effect of semen extenders on the sperm motility, viability, acrosome integrity and functional integrity of plasma membrane (HOST: hypo-osmotic swelling test) during liquid preservation of Korean Native boar semen. In this experiment, semen was diluted in Androhep plus, Beltsville Thawing Solution (BTS), ModenaTM, Seminark and Vitasem LD. Sperm-rich fractions were collected from three Korean Native boars and sub-samples were diluted (30×106 spermatozoa/ml) in different semen extenders. Semen samples were stored at 17℃ for 96 hours. On everyday (0, 24, 48, 72, 96 h) after storage, the sperm characteristics relevant for fertility, such as sperm motility, viability, acrosome integrity and HOST positive were evaluated. The motility of spermatozoa stored in different extenders was no significantly different among other extenders (P>0.05). Also, no difference was observed among samples processed with different extenders in the percentage of sperm viability, acrosome integrity and HOST positive. All extenders maintained a high percentage (70%) of sperm motility, viability and acrosome integrity through 96 h of storage. The result of this study show that there was no significant differences among extenders in their capacity to preserve motility, viability and membrane integrity of spermatozoa from normal, fertile Korean Native boars for 96 h of liquid preservation at 17℃.

The objective of this study was two folds: to investigate the relationship between paternal identification rate and sperm quality parameters such as motility and sperm chromatin structure assay after heterospermic insemination; to see if mutual complement between tests and development of useful technique to enhance the fertility in artificial insemination. In individual boar's fertilizing ability, 3 high fertility boars showed significantly high fertility (p<0.05) compared to 3 low fertility boars, but there was no difference in litter size between two groups. Sperm motility test in pooled and individual semen using computer assisted sperm analysis (CASA) revealed that no significant difference among boars. The high fertile boar showed tendency of low %Red (High red fluorescence/green+red fluorescence) in sperm chromatin structure assay (SCSA) but paternal identification rate from piglets did not differ after heterospermic insemination. The correlation coefficient between individual or pooled semen function test and farrowing rates were well correlated as follows: %Red with litter size (r= - 0.53, p=0.03); %Red with paternal identification rates (r=-0.51, p=0.03); paternal identification rates with litter size (r=0.57, p=0.02). These results indicate that sperm chromatin structure assay and sperm quality parameter test in pooled semen are useful method to predict and evaluate the fertilizing capacity after heterospermic insemination in boars.