• Feed Journal
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• v.4 no.2 s.30
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• pp.114-117
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• 2006

에너지 급여수준을 낮추면 사육기간이 길어져서 비육돈 출하일이 지연되나 도체의 체지방함량이 낮고, 체단백질 비율이 높아져서 저지방돈육 생산할 수 있을 것입니다. 이제는 양돈농가에서도 소비자의 기호에 맞추어 저지방돈육 생산하여야 할 것으로 기대하면서 본 연구결과가 저지방돈육생산의 기초자료로 활용되기를 바랍니다.

• The Korea Swine Journal
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• v.12 no.6 s.130
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• pp.118-122
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• 1990

양돈경영을 경영외부의 제3자적인 입장에서 본다면, 번식경영이든 일관경영이든 간에 양돈경영의 총체적인 대외 생산물은 돼지고기 수요.공급을 위한 비육돈이고, 양돈경영자는 비육돈 생산을 통해 소득을 얻고자 하는 것이다. 따라서 양돈경영의 합리화 방안을 논함에 있어서는 경영 내적인 면에 한정하지 않고 어느 면에서 보다 영향을 크게 미치는 경영 외적인 면도 불가결하게 보지 않으면 안된다.

• Proceedings of the KSAR Conference
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• 2005.06a
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• pp.47-54
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• 2005

In boars, unlike the cases in males of other species, gonadal hormones suppress voluntary feed intake. for this reason, barrows, compared with gilts or boars, eat too much feed resulting in excessive fat deposition. Two experiments were performed in the present study to investigate the effects of implantation of Revalor H[Experiment(Exp.) I: 140mg trenbolone acetate(a synthetic androgen) + 14mg estradiol-$17\beta(E_{2}\beta)$] and Compudose(Exp. II; 24mg $E_{2}\beta$) on growth efficiency, carcass characteristics and circulating concentrations of IGF-I and IGF-binding protein-3(IGFBP-3). In Exp. I, sixty-four cross-bred finishing barrows weighing approximately 60kg were randomly divided into eight pens under a 2[control vs Revalor implant] $\times$ 2(ad libitum vs $80\%$ ad libitum feeding) $\times$2[control($103\%$ NRC-recommended level) vs low-energy($87\%$ NRC recommendation) diet] arrangement of treatments. In Exp. II, effects of Compudose were studied using 80 finishing barrows(10 animals/pen). In both Exps., all the animals were slaughtered at 100- to 110-kg body weight. Both Revalor and Compudose implants caused a decrease in feed intake and backfat thickness without affecting major physicochemical characteristics of the carcass and an increase in circulating IGF-I concentration. Moreover, Revalor implant exhibited greater effects than restricted feeding, low-energy diet, or Compudose in these variables. In addition, Revalor implantation suppressed weight gain, but enhanced the feed efficiency without exhibiting any interaction with the diet or feeding. In summary, results suggest that 1) both androgen and estrogen suppress voluntary feed intake and backfat deposition and enhance IGF-I secretion and 2) these effects of the gonadal steroid hormones in growth are likely to be mediated, in part, by IGF-I in finishing barrows.

• Journal of Animal Science and Technology
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• v.49 no.2
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• pp.171-176
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• 2007

A total of 4,627 records on pre-weaning growth traits, birth weight(BW), weaning weight(WW) and pre-weaning daily gain(ADG) of Hanwoo’s born form 1970 to 2005 were collected from Hanwoo Experiment Station, National Livestock Research Institute. Variance components and heritabilities of BW, WW and ADG were estimated with two models; Model 1 included only direct genetic effect while Mode1 2 included direct genetic, maternal genetic and permanent environmental effects. Direct herit- ability estimates of BW, WW and ADG estimated by model 1 were 0.34, 0.26 and 0.20, respectively. In model 2, direct heritability and maternal genetic heritability estimates were 0.14 and 0.06 for BW, 0.07 and 0.04 for WW and 0.05 and 0.04 for ADG. Estimates of genetic correlation between direct and maternal effect for BW, WW and ADG were 0.58, 0.75 and 0.61, respectively. Genetic correlation coefficients between BW and WW, between BW and ADG, and between WW and ADG were 0.76, 0.62 and 0.99, respectively.

• Journal of Animal Science and Technology
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• v.47 no.4
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• pp.555-564
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• 2005

This study was conducted to investigate the effect of dietary supplementation of zeolite on growth performance, carcass characteristics and fecal ammonia gas release in the finishing pigs. A total of 120 crossbred finishing pigs (50.2$\pm$1.4kg, Landrace$\time$Yorkshire$\time$Duroc) were assigned to 4 treatments and randomly divided into 12 groups. They were divided between early finishing period (50~80kg) and late finishing period (80-120kg). Finishing pigs were fed on a basal diet supplemented with 0, 1, 2 and 4% levels of zeolite. Average daily gain and feed conversion were significantly (P<0.05) improved by the dietary supplementation of 4% zeolite compared with other treatments during overall period. In the finishing periods, ammonia gas emission was reduced (P<0.05) in 4% zeolite treatment more than that of the other treatments. Carcass weight and back fat thicknesses were not affected by zeolite treatments. But, the appearance of A grade pork was increased by the dietary supplementation of 4% zeolite. Feed cost was linearly decreased by increasing the supplementation of zeolite. According to this study, 4% supplement of zeolite is suitable for the improvement of carcass quality and feed conversion, the reduction of fecal ammonia gas emission and feed cost per body weight gain.

• Journal of Animal Environmental Science
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• v.17 no.2
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• pp.107-114
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• 2011

This study was designed to determine the effect of season and split-sex feeding on performance, stress and carcass quality of finishing pigs. Two hundred and seventy cross-bred finishing pigs $(82.1{\pm}0.82kg)$ were randomly divided into six groups in 2 seasons (summer and winter) ${\times}$ 3 split-sex feeding (female only, castrated male and mixed) factorial arrangement of treatments. In winter, feed intake and weight gain of finishing pigs were better than summer (p<0.05). Split-sex feeding was affected the feed conversion, feed conversion of finishing pigs were superior in winter and mixed groups. Plasma concentrations of cortisol as a stress indicators was greater in the mixed groups vs female only and castrated male groups. There were no interactions between the season and split-sex feeding in their effects on these blood variables. The season was affected the carcass characteristics and PSE incidence of the finishing pigs, PSE incidence was low in winter and mixed groups. Meat quality did not show any significant difference due to the difference of season and split-sex feeding of finishing pigs. There was no significant difference in the pH, drip loss and meat color of pork loin between the season and split-sex feeding of finishing pigs. In conclusion, the results of this study suggest that we need more precise on-farm management practice in summer and application of split-sex feeding skills to reduce the stress and improve welfare status of finishing pigs.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2002.11a
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• pp.152-152
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• 2002

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2002.11a
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• pp.151-151
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• 2002

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2003.06a
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• pp.138-138
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• 2003

• 농업기술회보
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• v.50 no.2
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• pp.26-27
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• 2013

우리나라의 2010년 연간 모돈 당 비육돈 출하두수는 16.5두로 양돈 선진국인 네덜란드 24.7두의 67% 수준으로 매우 낮다. 이는 산자수가 낮고 이유 후 폐사율이 높기 때문이다. 생산성을 높이기 위한 항생제 사용도 2011년 7월부터 전면 금지되었기에 농촌진흥청에서는 이유 후 새끼돼지의 폐사율을 줄일 수 있도록 어미돼지의 유질을 개선할 수 있는 항생제 대체물질 목단피 추출물 사료첨가제를 개발하였다.