• The Korea Swine Journal
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• v.16 no.5 s.177
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• pp.98-100
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• 1994

• The Korea Swine Journal
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• v.21 no.8 s.240
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• pp.80-83
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• 1999

양돈관리에 있어 생산성을 극대화하기 위한 방안을 살펴보면 첫째가 기록관리를 통한 생산성 분석, 둘째는 총산자수 향상을 위한 교배기술, 셋째는 효율적인 주간관리, 넷째는 임신진단을 통한 불임돈의 조기색출, 다섯째는 초산돈 관리와 분만후 5일 이내 자돈의 집중관리가 그것이다. 이 부분에서 총자산수 향상을 위한 교배기술은 무엇보다 중요하다. 특히 모돈에 있어서 이유후 재귀발정의 시기와 강도는 임신에 크나 큰 영향을 미친다. 다음에서 후보돈관리와 모돈관리, 웅돈관리 요령을 살펴보겠다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.02a
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• pp.536-541
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• 2000

• Journal of Animal Science and Technology
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• v.45 no.6
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• pp.1067-1078
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• 2003

This study was designed to determine the effect of gestation housing and parity on the farrowing performance and behaviour of sows during pregnancy, farrowing and lactation periods. Total 18 Duroc sows were randomly assigned after 4 weeks of gestation to either an individual gestation stall or a groups of three with pen gestation system for three parities(1st, 2nd${\sim}$3rd, and 4th${\sim}$5th). Approximately 7 days before predicted farrowing date, sows were transferred to farrowing crates where they remained until 21 days post-partum. Behaviour was recorded on day 60 and 90 of pregnancy for 24 hours, on day of farrowing for farrowing duration and on day 10 of lactation for 2.5 hours in the farrowing crate. The results obtained from this study were summarized as follows: On 60 and 90 day of pregnancy, all sows in both groups made attempts for ventral lying more than for other postures. Sows in the group gestation pen spent more time on walking than those in individual gestation stall(p<0.01); however, the group housed sows were spent less time on drinking than the individually housed sows(p<0.01). There was no significant difference between gestation housings in the occurrence of stereotypy of pregnant sows. On day 60 of pregnancy, sows in the individual gestation stall showed the highest frequency of vacuum chewing and head weaving. However, floor licking and bar licking behaviours were highest in day 90 pregnant sows individually housed. The sows individually housed during the gestation period spent more time on sitting and eating on the day of farrowing in the farrowing crate than the sows group housed. On day 10 of lactation in the farrowing crate, the group housed sows during the gestation period made significantly more attempts for ventral lying than sows individually housed. In conclusion, the occurrence of stereotypy of sows during the gestation and lactation did not differ between gestation housings and farrowing performance of sows during the gestation period was not affected by gestation housing. Thus, the group housing for pregnant sows is a feasible means to improve welfare of sows and to increase the normal behaviour of sows.

• Korean Journal of Animal Reproduction
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• v.27 no.1
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• pp.61-67
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• 2003

This study was conducted to investigate the effect of infusion of sterile boar and their semen as pregnancy antigen factor for improvement of production in gilts. We observed 160 gilts between 7 to 8 months of age that were divided into 4 treatment groups vie. A group-epidimetomized boar, B group-no sperm semen infusion, C group-vasectomized boar, and D group-control in a completely randomized design. The number of total pigs born(NT) of A, B, C, and D groups were 10.05, 10.44, 11.63, and 9.97 pigs, respectively(P<0.05). And the NT of C g.cup was the highest among treatment. The number of live pigs born(NB) was similar to NT The NB of C group (10.70) was higher than that of A(9.12) and control(9.11)(P<0.05). However, there was not significant between B and C groups. The progesterone concentration of C group was the highest compare to other group at the 6th day after breeding. However, the progesterone concentration of C was lower than other groups after 8th day. There were not significant among cortisol of A, B, C and D groups. According of the results of this study, the infusion with vasectomized boar and semen at estrus before gestation can be improved reproductive efficiency because of more litter size in gilts.

• 대한생식의학회:학술대회논문집
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• 2001.11a
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• pp.110-110
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• 2001

• Korean Journal of Animal Reproduction
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• v.26 no.2
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• pp.87-94
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• 2002

This study was performed during the four seasons for the production of transgenic pigs containing the Cellulase Digest Gene. Purebred Landrace gilts and sows approximately 8∼15 months of age (n=126) were used for the collection of 1-cell zygotes for DNA microinjection and transfer. Retrospectively, estrus synchronization and superovulation schemes were evaluated to assess practicality fur zygote collection. Synchronization and superovulation procedures were used that cyclic gilts were synchronized with 20mg altrenogest (ALT) per day for 9 days after PG600 administration followed by superovulation with 1000 IU pregnant mares serum gonadotropin (PMSG) and 750IU human chorionic gonadotrophin (hCG). The cellulase digestion gene for microinjection is rat elasterase promoter (rEl) linked to CelD gene. After hormone treatment, 1,422 embryos were collected from 91 donors and 95.6% (1,359/1,422) embryos were in 1-cell stage which can be visualized the pronuclei for DNA microinjection. A total of 725 DNA microinjected embryos transferred into 35 recipients and produced 65 piglets from 13 litters. Pregnancy rate according to the number of transferred embryos to recipients was higher the group which received 21 to 24 embryos (50.0%) than other groups 20.0% in less and 33.3% in more. A tail tissue was collected from 65 piglets for biopsy. PCR screening was performed on each DNA sample using two separate sets of primers specific for the 5'- and 3'-flanking region of the rEl-CelD gene. Five of the 65 piglets (7.69%) were positive for the transgene. This study provide useful information regarding production of transgenic pig for bioreactor research.

• 대한생식의학회:학술대회논문집
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• 2001.06a
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• pp.41.1-41.1
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• 2001

• 대한생식의학회:학술대회논문집
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• 2003.12a
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• pp.130-131
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• 2003

• Journal of Animal Science and Technology
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• v.48 no.1
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• pp.69-76
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• 2006

This study was conducted to evaluate the effects of feeding rye silage and feed restriction on both growth and reproductive performances in replacing gilts. Twenty four replacing gilts (Landrace×Yorkshire, 67.63±1.17kg initial BW) were used in 49 d growth assay. Dietary treatments were included 1) CON(basal diet), 2) S15(15% feed restriction + ad libitum rye silage) and 3) S30(30% feed restriction + ad libitum rye silage). In growth performance, average daily gain and average daily feed intake were the highest in CON among treatments(P<0.05). Average daily silage intake was not significantly different between S15 and S30 treatments(P>0.05). Feed conversion ratio was the lowest in CON among treatments(P<0.05). Average silage intake of S15 and S30 treatments was increased as time goes by(P<0.05). While all gilts of S15 and S30 treatments became pregnant, one gilt of CON became pregnant. Also, first estrus and mating were occured earlier in S15 and S30 than those of CON. In conclusion, 15% feed restriction and feeding rye silage reduced growth performance, reached earlier to first estrus and increased pregnancy rate in replacing gilts.