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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Animal Science and Technology
Journal Basic Information
Journal DOI :
Korean Society of Animal Science and Technology
Editor in Chief :
Volume & Issues
Volume 44, Issue 6 - Dec 2002
Volume 44, Issue 5 - Oct 2002
Volume 44, Issue 4 - Aug 2002
Volume 44, Issue 3 - Jun 2002
Volume 44, Issue 2 - Apr 2002
Volume 44, Issue 1 - Feb 2002
Selecting the target year
The Development of Adjustment Coefficients for Linear Classifications in the Korean Holstein Dairy Cattle
Song, C.E. ; Sang, B.C. ; Do, C.H. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 1~12
DOI : 10.5187/JAST.2002.44.1.001
The environmental effects were studied to estimate age and lactation stage adjustment coefficients in the primary linear traits of Holstein dairy cattle in Korea. Calving year month, classifier, age-month at classification and lactation stage were the environmental factors which significantly affected the most of linear traits at the level of 0.01. F values of Stature, strength, body depth, thurl with and rear leg side view were relatively higher in the effects of age-month, and dairy form, rear udder height, rear udder width, and udder cleft had relatively higher F values in the effects of lactation stage. Udder depth were affected highly by both age-month and lactation stage. Through the least square means of traits and the interpolation and smoothing obtained by the regression analysis of log and exponential transformed adjustment coefficients, age-month and lactation stage coefficients were estimated, and applied to real data to check the variation in the age-month and lactation stage effects. The estimated mean squares showed that the variation in all the linear traits significantly were decreased for the adjusted factors without the significant changes of variation in calving year month and classifier. That udder depth adjusted for both the age-month and lactation stage resulted in the decreases of variation in the both effects.
Identification of the Differentially Expressed Genes of Hanwoo During the Growth Stage by Subtractive cDNA Hybridization
Jang, Y.S. ; Kim, T.H. ; Yoon, D.H. ; Park, E.W. ; Cheong, I.C. ; Jo, J.K. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 13~22
DOI : 10.5187/JAST.2002.44.1.013
To identify the differentially expressed genes at growth stage of Hanwoo, we constructed the subtractive cDNA library from loin mRNA of 12- and 24-month old Hanwoo by PCR-based subtraction. The fourteen genes were confirmed by sequencing and reverse northern blot analysis, and they were selected as candidate of putative genes differentially expressed at the growth stage of Hanwoo. Three subtracted cDNA fragments that expressed specific signal to cDNA probe for 6-month-old loin of Hanwoo were highly homologous to those of the genes encoding EPV 20, Ca2＋ATPase, and TCTP, respectively. The nine cDNA clones showed intense signal to cDNA probe from 12-month-old loin of Hanwoo, and highly homologus to those of genes encoding VCP, HSP 70, aldolase A, MSSK1, GM-2 activator protein, ryanodine receptor, acidic ribosomal phosphoprotein p1, ADP/ATP translocase, and UCP 2, respectively. Two subtracted cDNA clones that expressed specific signal to cDNA probes for 12- and 24-month-old loin of Hanwoo were detected. One of them was highly homologus to the gene encoding ferrochelatase and the other was highly homologus to the gene encoding ADRP.
Analysis of Melanocortin Receptor 1 (MC1R) Genotype in Korean Brindle Cattle and Korean Cattle with Dark Muzzle
Lee, S.S. ; Yang, B.S. ; Yang, Y.H. ; Gang, S.Y. ; Ko, S.B. ; Jeong, J.K. ; Oh, W.Y. ; Oh, S.J. ; Kim, K.I. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 23~30
DOI : 10.5187/JAST.2002.44.1.023
PCR-RFLP analysis was carried out to investigate the genotype of Melanocortin receptor 1 (MC1R) gene in Korean Brindle Cattle and Korean Cattle with dark muzzle, which are coat color and muzzle pigmentation variants of Korean Cattle, respectively. Allelic variants of MC1R in cattle were analyzed by digestion with BsrFⅠ, AciⅠ. Among six genotypes,
/e and e/e, detected in cattle, only two genotypes,
/e, were observed in Korean Brindle Cattle, probably reflecting the necessary of
allele for the expression of black brindle coat color. As in Korean Cattle with light muzzle, the
/e and e/e genotypes were detected in Korean Cattle with dark muzzle. The
and e alleles frequencies in two populations of Korean Cattle with dark muzzle and with light muzzle were 0.37, 0.63 and 0,11, 0.89, respectively. Although the frequency of
allele in Korean Cattle with dark muzzle was higher than in Korean Cattle with light muzzle, the
allele was not completely associated with dark muzzle pigmentation. The results of this experiment indicate that the difference of MC1R genotype and frequency may be useful for fixation of coat color in Korean Cattle as well as Korean Brindle Cattle.
Determination of Significance Threshold for Detecting QTL in Pigs
Lee, H.K. ; Jeon, G.J. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 31~38
DOI : 10.5187/JAST.2002.44.1.031
Interval mapping using microsatellite markers was employed to detect quantitative trait loci (QTL) in the experimental cross between Berkshire and Yorkshire pigs. In order to derive critical values (CV) for test statistics for declaring significance of QTL, permutation test (PT) of Churchill and Doerge method(1994) and the analytical method(LK) of Lander and Kruglyak(1995) were used by each trait and chromosome. 525
progeny phenotypes of five traits(carcass weight, loin eye area, marbling score, cholesterol content, last back fat thickness) and genotypes of 125 markers covering the genome were used. Data were analyzed by line cross regression interval mapping with an F-test every by 1cM. PT CV were based on 10,000 permutations. CV at genome-wise test were 10.5 for LK and ranged from 8.1 to 8.3 for PT, depending on the trait. CV, differed substantially between methods, led to different numbers of quantitative trait loci (QTL) to be detected. PT results in the least stringent CV compared at the same % level.
Effects of Polyclonal Antiserum Against Adipocyte Plasma Membrane Proteins on Body Composition of Passively Immunized Sprague-Dawley Male Rats
Baek, K.H. ; Choi, C.B. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 39~44
DOI : 10.5187/JAST.2002.44.1.039
The current study was conducted to investigate the effects of administration of antiserum against adipocyte plasma membrane(APM) proteins into rats on body fat mass. Twenty(20) male adult Sprague-Dawley rats were randomly allocated into either control or antiserum treatment group(10 rats/treatment) and immunized with physiological saline(control group) and polyclonal antiserum (treatment group), respectively, raised in sheep against rat APM proteins(5times, 2day interval). All animals were killed 4weeks after last injection. Intraperitoneal(i.p.) administration of antiserum significantly(P=0.0054 and P=0.0019, respectively) reduced subcutaneous(21.9%) and perirenal + mesentric + epididymic(36.0%) adipose tissue mass in rats of treatment group. Although body weights of antiserum treated rats were decreased during immunization, the rats recovered their body weight after 1 week of treatment. There were no significant changes in the level of blood glucose and in the contents of muscle protein and fat in antiserum treated animals. Current results indicate that polyclonal antibodies against APM proteins could be used to manipulate body fat mass in meat animals as well as laboratory animals. Further studies, however, are necessary for the practical applications of the current results.
The Effects of Supplementation of Ascidian Tunic Shell into Laying Hen Diet on Egg Quality
Kim, E.Mi. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 45~54
DOI : 10.5187/JAST.2002.44.1.045
This study was conducted to evaluate the feeding value of ascidian tunic shell the effects of its dietary supplementation on laying performance, egg-yolk pigmentation, egg-shell strength and egg taurine content. A total of 168 brown layers at the age of 29wks in commercial cage were fed for 4 wks with 7 different diets containing ascidian tunic shel1(AST) at varying levels of 0
5% Dm or 0% AST with 100ppm carophyll red. No differences were found in egg production and weight among the treatments indicating that ascidian tunic shell did not adversely affect the laying performances. Adding the ascidian tunic shell to the diets increased egg-yolk pigmentation compared to the control and resulted in simillar or better effect on egg-yolk pigmentation compared to 100ppm carophyll red. The data suggest that ascidian tunic shell may be used as feed ingredients in layer diet enrichment of egg-yolk pigmentation in the place of carophyll red(chemical pigment). Specific gravity and breaking strength of egg shell were significantly increased by the adding ascidian tunic shell to the diet, suggesting that ascidian tunic shell may be used as feed ingredients for increasing egg shell strength. Also taurine content of egg was significantly increased with increasing supplementation of ascidian tunic shell to the diet(p<0.05). Therefore, ascidian tunic shell may be used as feed ingredients in laying hen diet to improve egg quality such as egg-yolk pigmentation, egg-shell strength and egg taurine enrichment.
Influences of Supplemental Plant Phytase (Phytazyme
) on Performances and Phosphorus Excretion in Laying Hens
Kwon, S.K. ; Kim, S.K. ; An, B.K. ; Yang, U.M. ; Nam, K.T. ; Kang, C.W. ; Kang, S.J. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 55~60
DOI : 10.5187/JAST.2002.44.1.055
Two experiments were conducted to investigate the effect of dietary supplementation of plant phytase (Phytazyme
) in corn-soybean meal based diets on utilization of phytase-bound phosphorus in laying hens and evaluate nitrogen(N) digestibility and phosphorus(P) availability in breeders. In the experiment one, three levels of the Phytazyme
(0.05, 0.1, and 0.2% of diet) were added to diets containing a half of control TCP level(0.96%) for 4 wks. Feed consumption, egg production rate, egg weight and eggshell quality were recorded weekly. At the end of experiment, 8 birds per treatment were sacrificed, liver weight were weighed and right tibiae were removed for determination of P content. The second experiment was conducted to evaluate the P availability and nitrogen digestibility in breeders fed same diets for 2 wks. Feed and excreta were collected to determine the P and N contents for the last three days of experiment two. Addition of Phytazyme
resulted in no effects on feed intake, egg product rate, egg weight and egg shell quality. P excretion decreased and its availability enhanced as phytase supplementation increased in diets. Dietary supplementation of Phytazyme
above 0.1% level in corn-soybean meal based diets did not have an adverse effect on production and decreased level of phosphorus in excreta.
Effect of Cubed Roughage Supplementation and Red Clay Levels on Growth Performance, Meat Quality and Economic Benefits in Korean Native Cattle
Jin, Y.H. ; Jin, M.G. ; Hong, J.S. ; Lee, H.G. ; Lee, B.K. ; Kim, J.S. ; Choi, Y.J. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 61~68
DOI : 10.5187/JAST.2002.44.1.061
This study was conducted to estimate the effects of high quality cubed roughage and red clay (0%, 1%, 2%) on growth performance, meat quality and economical benefits. Thirty-six 6 month-old Korean native cattle, averaging 156kg of BW, were assigned to six groups in a 2 (rice straw : RT, rice straw+cubed roughage : RCT)
3 (0, 1, 2% red clay). During experimental period, the high quality cubed roughage added into rice straw treatment (RCT) was superior to the only rice straw treatment (RT) on daily gain and feed efficiency and final weight 10%, 6.8%, 8.2% (P$<$0.05) respectively. But the addition of red clay did not affect and even 2% addition decreased those parameters. For meat quality and economical analysis, the addition of high quality cubed roughage made an outstanding result and for RT treatment, only 1% red clay indicated good effects while both 1% and 2% red clay were better than 0% for RCT treatment. From these results, it is assumed that the addition of red clay for fattening Korean native cattle has no effects on growth performance but 1% treatment has good results on improving meat quality and economical benefits. It also suggests that the combination high quality roughage and concentrated red clay is beneficial for producing high quality meat in with economical benefits.
Studies on Hygienic Status of Raw Milk in Dairy Farms
Jin, S.H. ; Ko, M.S. ; Lee, C.E. ; Lee, H.J. ; Kim, E.J. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 69~74
DOI : 10.5187/JAST.2002.44.1.069
This study was conducted to investigate the milk quality produced from dairy farms in Jeju province and to analyze the variety of pathogenes and the number of somatic cells in the milk. Data were collected from 262 lactating cows from 8 farms of three regions and the results obtained are summarized as follows. 1. The average daily milk yields and milk fat contents from June and October were 22.3 kg and 3.7%, respectively. 2. The average number of bacterial counts in raw milk was 1.5
/ml, but that in farm A was over 3.0
/ml. 3. The somatic cell counts were 2.5
/ml in average and those in farm G and H were higher than those in other farms. Their distribution in 262 lactating cows from June to October was as follows; less than 2.0
/ml in 68.8% of cows, 2.0-5.0
/ml in 18.8% of cows and more than 5.0
/ml in 12.4% of cows. 4. Of the 113 isolates (compartments of cow udder) from mastitic milk, Staphylococcus aureus was found in 47, Streptococcus ogalatiae in 17 and Bacillus in 12. 5. The average monthly income of the farmers was 407 thousand won/head, and that in farm A or E was higher than that of farm H (456-475 thousand won vs. 314 thousand won) In conclusion, to improve income dairy farmers should reduce the somatic cell counts in the milk and mastitis infection through regular disinfection and inspection.
The Nutritive Values and Manufacture of Total Mixed Fermentation Feeds using Green Forage Crops and RiCE-straw
Lee, H.J. ; Cho, K.K. ; Kim, W.H. ; Kim, Hyeon-Seop ; Kim, J.S. ; Hang, S.H. ; Woo, J.H. ; Lee, H.G. ; Choi, Y.J. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 75~86
DOI : 10.5187/JAST.2002.44.1.075
Adequate forage amounts in ruminant animal are necessary for proper ruminal function in dairy cow. This study was carried out to determine the effect of total mixed fermentation feeds made by different green forage crops and grain processings on chemical compositions, RFV (relative feed value) and ruminal characteristics in sheep. The experiment was arranged in a split plot design with 4 replications. The main plot consisted of 6 kinds of green forages (corn, grass, rye, rape, alfalfa and oat) and the sub plots three different grain processings such as non-milling, half milling (7mm mesh over), and regular milling (7mm mesh below). And the different TMFFs (total mixed fermentation feeds) were analyzed for chemical composition and fed to 8 ruminally fistulated sheep for ruminal charactics and palatability. RFV, daily feed intake, acetate/propionate ratio of the rape-TMFFs were higher compared with the other treatment. Ruminal content of VFA (volatile fatty acid) of corn-TMFF was highest as 90.19 mmol% and pH of the feed was lowest as 3.82. But, acetic acid, propionic acid and butyric acid were no difference among treatments. In conclusion, the effect of grain proceeding was not appeared but if consider of only RFV, palatability and dry matter disappearance, grade of TMFF was improved in order of rape-, corn-, alfalfa-, grass-, oat- and rye-TMFF.
Comparison of Dry Matter Intake, Digestibility, and Nitrogen Balance in Spotted Deer (Cervus nippon) fed Forest by-product Silage, Arrowroot (Pueraria thunvegiana) Silage and Oak Browse (Quercus aliena) Hay
Jeon, B.T. ; Kim, Y.H. ; Lee, S.M. ; Kim, K.H. ; Moon, S.H. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 87~94
DOI : 10.5187/JAST.2002.44.1.087
A comparison of intake, digestibility and nitrogen balance in spotted deer(Cervus nippon) fed forest by-product silage(FBS), arrowroot silage(ARS) and oak leaf hay(OLH) was made to examine the feeding value of forest by-product silage. Dry matter digestibility of ARS was significantly higher(p$<$0.05) than that of OLH while crude protein digestibility was significantly higher(p$<$0.05) in ARS and FBS than in OLH. The digestibility of crude fiber was highest in FBS. Dry matter intake of OLH was significantly higher(p$<$0.05) than that of ARS, and there was no significant difference with FBS. Nitrogen intake was higher in OLH and ARS than in FBS, but there was no significant difference. Fecal nitrogen was highest(p$<$0.05) in OLH and urinary nitrogen was highest(p$<$0.05) in ARS. Retained nitrogen was highest in FBS, however, there was no significant difference among treatments. In Conclusion. FBS was estimated as a useful roughage source for deer, showing high digestibility, dry matter intake and nitrogen utilization.
Feed Intake Evaluation of Korean Cattle (Hanwoo) Fed Diets Containing Different Levels of Compound Fattening Periods
Shin, K.J. ; Oh, Y.G. ; Lee, S.S. ; Kim, K.H. ; Kim, C.H. ; Paik, B.H. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 95~104
DOI : 10.5187/JAST.2002.44.1.095
A study was conducted to evaluate feed intake of Hanwoo bulls and steers fed diets of compound feed and rice straw. Twenty bull calves and sixty steers at 5 to 7 months old were used. The experimental period was divided into three feeding stages which are growing period (〈300 kg body weight (BW)), early fattening period (300-450 kg BW) and late fattening period (〉450 kg BW). The animals were given the diets containing 14.1% crude protein (CP) and 70.0% total digestible nutrients (TDN) in the growing period, 12.1% CP and 70.6% TDN in the early fattening period, and 11.2% CP and 71.9% TDN in the late fattening period, respectively. Experiment 1 was designed to compare feed intake (as-fed basis) between Hanwoo bulls and steers fed the experimental diets ad libitum. In Experiment 2, Hanwoo steers were allocated in one of three compound feed feeding treatments to investigate feed intake (as-fed basis). The treatment groups were ① feeding level 1 group fed compound feed ad libitum through the whole periods; ② feeding level 2 group fed 1.0% compound feed per kg BW in the growing period, 1.5% compound feed per kg BW in the early fattening period and compound feed ad libitum in the late fattening period; and ③ feeding level 3 group fed 1.5% compound feed per kg BW in the growing period, 2.0% compound feed per kg BW in the early fattening period and compound feed ad libitum in the late fattening period. In Experiment 1, the average daily feed intake of bulls increased linearly through the whole experimental period while the feed intake of steers increased until their body weight was reached upto 521 kg, afterward reduced. Average daily feed intake was about 3.5% per kg BW of both bulls and steers at the beginning (150 kg BW) of Experiment 1 while bulls and steers at 600 kg BW consumed the diets of 2.0 and 1.5% per kg BW, respectively. In Experiment 2, the average daily feed intake of steers in the feeding level 1 group gradually increased through the growing and early fattening periods and then steadily reduced over the late fattening period. The average daily feed intake in the feeding level 2 group linearly increased through the whole period while the feed intake in the feeding level 3 group showed a relatively rapid increase and reached a peak at 455 kg BW, and then sharply dropped. The average daily feed intake of steers in the feeding level 1 at the beginning (150 kg BW) of Experiment 2 was about 3.5% per kg BW but there was a reduction (1.5% per kg BW) at 600 kg BW. Besides, The feed intake of steers in the feeding level 2 and 3 in which compound feed was given with limitation increased to 2.0-3.0% per kg BW in the growing period and then reduced to 1.5-2.0% per kg BW. The limited compound feed feeding of steers in Experiment 2 resulted in higher rice straw intakes up to two to three folds and two folds in the growing and early fattening periods, respectively, than the ad libitum feeding.
Effects of Heat Treatment of Three Animal by-products on Ruminal Degradation Characteristics and Intestinal Availability of Crude Protein
Moon, Y.H. ; Lee, S.C. ; Kim, B.K. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 105~112
DOI : 10.5187/JAST.2002.44.1.105
In order to investigate the effects of heat treatment of three animal by-products(feather meal, tallow meal, viscera meal) on in situ ruminal degradation characteristics and gastrointestinal availability of dietary crude protein(CP), three ruminally and duodenally cannulated dry Holstein cows were employed. Cows were fed a diet containing 60% concentrate and 40% orchard grass hay, and had free access to water and mineral block. Experimental feeds were processed for 4 hr at 149
in a forced-air oven, and were passed through a 1-mm screen. Degradation kinetics of feed protein in the rumen were fitted to an exponential type model, and intestinal availability was estimated by the mobile nylon bag technique. Effective CP degradabilities in the rumen for feather meal, tallow meal and viscera meal were 30.2%, 75.0% and 56.4% at 5% passage rate per hour(k=0.05), respectively. In addition, heat treatment increased effective ruminal CP degradability on feather meal and viscera meal treatments, whereas decreased in tallow meal treatment(P$<$0.05). Gastrointestinal CP disappearances of feather meal, tallow meal and viscera meal were 56.2%, 18.6%, and 37.9%, respectively. In addition, heat treatment decreased the gastrointestinal CP disappearance on feather meal and viscera meal treatment, but increased in tallow meal treatment(P$<$0.05). Intestinal availability of rumen undegradable protein(A-UDP) was 80.4% for feather meal, 83.8% for tallow meal and 86.9% for viscera meal. In addition, heat treatment increased A-UDP on feather meal and tallow meal treatment, 94.0% and 91.3%, respectively, but decreased on viscera meal treatment, 76.5%(P$<$0.05).
Effect of Irradiation, Packaging Methods and Storage Periods on the Oxidation of Cholesterol in Beef Meat
Shin, T.S. ; Lee, J.I. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 113~122
DOI : 10.5187/JAST.2002.44.1.113
Beef loins that retailed in market were used as experimental samples. Some beef samples in raw state were packaged with PVDC as aerobic and vacuum condition. The other beef samples were cooked until core temperature arrived at 70
and then packaged immediately in the same way of raw samples. After these samples were irradiated by electron beam 6kGy, irradiated samples were stored in refrigerator(2～4
). Identify and quantity of cholesterol oxides were analysed stored at 0 and 7 days, respectively. During the early stage of storage, 7
-hydroxycholesterol and 7-ketocholesterol were respectively produced from the raw meat samples, and the production of these chemicals were significantly higher (P$<$0.05) from the meats with aerobic packaging than those with vacuum packaging. With the passage of storage time, 7
-epoxide and some other chemicals, which were not produced during the early stage of storage, were produced, Also, the production of these chemicals were significantly increased (P$<$0.05) with the passage of storage time. Cooked meat after irradiation and irradiated meat after cooking produced cholesterol on the 7th day of storage, although this chemical was not produced during the early stage of storage. Production of cholesterol oxides was significantly increased (P$<$0.05) with the passage of storage time for all treatments, and showed significantly lower value (P$<$0.05) with the vacuum packaging than aerobic packaging. Summarizing the aforementioned results, it was found that the production of cholesterol oxides was more easily affected by packaging condition than irradiation.
Evaluation of Ventilation Systems in an Enclosed Nursery Pig House
Song, J.I. ; Choi, H.L. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 123~134
DOI : 10.5187/JAST.2002.44.1.123
An experiment was conducted to establish the most suitable ventilation system for the enclosed nursery pig house in Korea, comparing four different ventilation systems ; i) air enters through perforated ceiling and exhausts through chimney (NA), ii) air enters through perforated ceiling and exhausts through side walls (NB), iii) air enters through perforated ducts and exhausts through side walls (NC) and iv) air enters through perforated ducts and exhausts through chimney(ND). The experiment was carried out during winter and summer separately. The experimental pigs were weaned at fourteen days old in winter (December-February) and at twenty one days old in summer (June-August). The main results of the experiment are as follows : A preliminary experiment showed that in the NC system during summer, air can reach all the pig rooms in the house and the air flow rates of the upper, middle (1.2 m height of the room) and low (at the height of pig stature) parts of the room were measured at 7.0-8.08, over 0.5 and over 0.2 m/s, respectively, which flow rates were much higher(p$<$0.05) than those in other system. At the minimum ventilation efficiency during winter, air flow rates of upper, middle and low parts of the room equipped with the NC system were detected at over 1, less than 0.5 and around 0.07 m/s, respectively. It is concluded that the separated ventilation system air-entering through ducts is the most suitable for the ventilation system of the enclosed nursery pig house and the exhausting system through side walls is more efficient for ventilation than the system through roof. Furthermore, to sustain proper temperature and reduce energy waste as well as heat consumption, a future research should be carried out to develop the environmental control system in relation to developing a heat regulator.
Evaluation of Ventilation Systems in an Enclosed Growing Pig House
Song, J.I. ; Choi, H.L. ;
Journal of Animal Science and Technology, volume 44, issue 1, 2002, Pages 135~144
DOI : 10.5187/JAST.2002.44.1.135
An experiment was conducted to evaluate a ventilation system, which was devised to encourage farmers to use the enclosed growing and finishing pig housing system. A roof-air-entry ventilation system in winter and a side-wall-air-entry system in summer were evaluated. Air flow rate on the floor level which is the low part of pen and the living area of pigs in the enclosed growing and finishing pig house during winter was measured at 0 to 0.19 m/s at the minimum ventilation efficiency of 1,440
. During summer the air flow rate was detected at 0.07 to 0.42 m/s at the maximum ventilation efficiency of 24,000
. Therefore, it is concluded that the side-wall ventilation system is suitable for growing and finishing pigs in the enclosed house during the days of mid-summer and the roof-ventilation system was suitable during the coldest days of mid-winter. In addition, although the enclosed pig house has the system in which air exhausts through only one side wall, air should enter through both-side walls for the better ventilation performance.