• 한국해양생명과학회지
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• 제7권2호
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• pp.180-186
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• 2022

본 연구는 연어(Oncorhynchus keta) 치어의 성장, 생존 및 혈액 성상에 미치는 염분 농도의 영향을 파악하고자 실시되었다. 실험은 염분 농도 0, 10, 20 및 30‰에서 30일간 실시되었으며 3반복으로 진행되었다. 4주 후 생존율은 0, 10 및 20‰ 실험구에서 87.5% 이상이었으나, 30‰ 실험구는 75%로 유의한 감소를 보였다. 증중율(Weight gain), 일간 성장률(specific growth rate), 사료효율(feed efficiency), 일간 사료섭식량(daily feed intake), 일간 단백질섭취율(daily protein intake), 단백질효율(protein efficiency ratio)은 10‰ 실험구에서 가장 높았다. 혈장성분 중 ALT(alanine aminotransferase)는 10, 20 및 30‰ 실험구가 0‰ 실험구에 비해서 유의한 감소를 보였으나, Na⁺ (sodium)과 Cl^- (chloride)는 유의한 증가를 보였다. 또한, 실험기간 중 TP (total protein)과 K⁺ (potassium)은 변동을 보이지 않았다. 결론적으로 연어 치어(11~33 g)의 성장과 생존에 적합한 최적의 염분 농도는 10‰로 보이나, 혈액 성상의 영향은 향후 추가적인 연구가 필요한 것으로 판단된다.

• 한국수산과학회지
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• 제43권4호
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• pp.320-324
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• 2010

We investigated the proper feeding frequency and satiation rate for the growth of red- and white-colored carp fingerlings in a feeding experiment. Triplicate groups of fish averaging 6.3 g were fed diets at four feeding frequencies (1, 2, 3, or 4 meals a day) and two satiation rates (satiation and 80% satiation) for 6 weeks. The survival of the fish was not affected by either the feeding frequency or the satiation rate. The weight gain, feed efficiency, and protein efficiency ratio of fish were affected by the feeding frequency and satiation rate, and increased significantly with both. The feed efficiency and protein efficiency ratio with satiation feeding of fish fed four meals a day did not differ from those of fish fed three meals a day. The daily feed intake was affected by the feeding frequency and satiation rate. The moisture, crude lipid, and ash contents of whole body were affected by the feeding frequency. Moisture and crude lipid contents were affected by feeding satiation. Based on these results, we conclude that the proper feeding frequency and satiation rate for the optimum growth of red- and white-colored carp fingerlings is four meals a day with satiation feeding.

• Asian-Australasian Journal of Animal Sciences
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• 제10권3호
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• pp.324-328
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• 1997

The objectives of this study were to measure growth rate and endocrine changes and to improve milk production by somatostatin passive immunization in rat. Experimental animals were 10 weeks old 20 Sprague-Dawley rats. The rats were randomly assigned each 10 in control (normal sheep serum injected: NSS) and treatment (anti-somatostatin injected), and pre-fed for 2 weeks. Anti-somatostatin was purified from serum of 1 year old sheep after somatostatin active immunization, and was injected daily to rats, and growth rate and milk yield were measured for 14 days. Growth rate of litters was 2.15 g/d and 2.32 g/d in NSS and anti-somatostatin injected, respectively. Milk production was increased 6.2% in day 8 and 6.5% in day 12 by anti-somatostatin injection. Plasma growth hormone, insulin, glucose, and urea-N were increased, but non-esterified fatty acid was decreased by anti-somatostatin injection. In summary, passive immunization of somatostatin improved growth rate of litters and milk production in rats.

• 한국패류학회지
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• 제30권3호
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• pp.235-242
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• 2014

본 연구는 해상가두리와 육상수조의 다양한 중간양성 방법에 대한 성장 및 생존율을 조사하여 육상수조에서의 전복치패 양성의 효율성 증가와 생산성향상을 유도하고자 실시하였다. 해상가두리 (net cage culture, NCC) 실험은 육상수조 사육은 2013년 6월부터 2014년 4월까지 10개월 (300일) 동안 실시하였고, 실험 전복은 2012년에 종묘생산 된 양성 1년생 (각장 평균 22.74-23.67 mm) 을 사용하였다. 육상수조 실험구 설정은 바닥식 양성 (floor culture, FC), 그물 바닥식 양성(net floor culture, NFC), 이중 쉘터 양성 (double shelter culture, DSC) 그리고 육상 가두리 양성 (indoor net cage culture, INCC) 을 각각 2반복구로 설정하여, 수조 당 10,000 마리를 수용하였다. 해상가두리의 월별 각장과 성장률(absolute growth rate of shell length, $AGR_{SL}$) 은 육상수조 사육방법보다 유의적으로 높았고 (P < 0.05), 육상수조 내 사육방법별 월별 중량변화는 유의적 차이가 없었다. 전복치패 각장의 일간성장률 (daily growth rate of shell length, $DGR_{SL}$), 특수생장율 (specific growth rate of shell length, $SGR_{SL}$) 에서도 NCC가 육상수조 실험구보다 유의적으로 높았으며 (P < 0.05), 각폭 성장에서의 성장률 (absolute growth rate of shell breadth, $AGR_{SB}$), $DGR_{SB}$, $SGR_{SB}$에서 NCC가 육상수조 내 실험보다 유의적으로 높았고 (P < 0.05), 육상수조 내 실험구간의 유의적 차이는 없었다. 육상수조 내 실험구에서 측정된 전복체중 성장은 FMW, WG, DWG, SWG에서는 각 실험구별로 유의적 차이가 없으며, 모든 실험구의 생존율은 실험종료 시 까지 55-60%를 유지하였다. 따라서 2 cm이상의 전복치패는 중간양성 시 동일한 밀도, 먹이를 공급한 육상수조 내에서는 차이를 보이지 않았지만, 신선한 먹이가 공급되면서 가두리 주위로 자연먹이가 풍부하게 자랐던 해상가두리가 성장에 유리하게 작용하였던 것으로 판단된다.

• 농업과학연구
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• 제36권2호
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• pp.179-184
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• 2009

본 연구는 젖소 초유를 마우스에 급여후 성장과 사료섭취에 관하여 연구한 것이다. 초유구, 시유구, 대조구로 나누어 각 시험구당 10마리씩 나누어 실험하였다. 마우스의 사료섭취는 시험기간 2주 동안 대조구는 4.73 g, 시유구는 3.95 g, 초유구는 3.4.1g 이었다. 마우스의 시유 및 초유섭취는 시험기간 2주 동안 대조구는 0 g, 시유구는 9.93 g 섭취, 초유구는 10.17 g을 섭취하였다. 물 섭취는 2주간 대조구가 6.28 g, 시유구가 4.74 g, 초유구가 4.67 g을 섭취하였다. 마우스의 증체율은 초유구가 대조구에 비해서 16.73%(P<0.05) 높았다. 마우스 혈액으로부터 조사한 엘러지와 관련된 사이토카인 IL-4는 초유에서 낮게 나타났다. 따라서 젖소 초유가 마우스의 증체율 및 사료 섭취에 큰 영향을 미치는 것으로 사료된다.

• Animal Bioscience
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• 제37권6호
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• pp.1065-1076
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• 2024

Objective: This study aimed to assess the effects of dietary mulberry leaves on the growth, production performance, gut microbiota, and immunological parameters of poultry and livestock. Methods: The PubMed, Embase, and Scopus databases were systematically analyzed to identify pertinent studies up to December 2022. The effects of mulberry leaf diet was assessed using the weighted mean difference, and the 95% confidence interval was calculated using a random-effects model. Results: In total, 18 studies that sampled 2,335 poultry and livestock were selected for analysis. Mulberry leaves improved the average daily gain and reduced the feed/meat ratio in finishing pigs, and the average daily gain and average daily feed intake in chicken. In production performance, mulberry leaves lowered the half carcass weight, slaughter rate, and loin eye area in pigs, and the slaughter rate in chickens. Regarding meat quality in pigs, mulberry leaves reduced the cooked meat percentage, shear force, crude protein, and crude ash, and increased the 24 h pH and water content. In chickens, it increased the drip loss, shear force, 45 min and 24 h pH, crude protein, and crude ash. Mulberry leaves also affect the abundances of gut microbiota, including Bacteroides, Prevotella, Megamonas, Escherichia-Shigella, Butyricicoccus, unclassified Ruminococcaceae, Bifidobacterium, Lactobacillus, and Escherichia coli in poultry and livestock. Mulberry leaves at different doses were associated with changes in antioxidant capacity in chickens, and immune organ indexes in pigs. With respect to egg quality, mulberry leaves at different doses improved the shell strength, yolk color, eggshell thickness, and eggshell weight. However, moderate doses diminished the egg yolk ratio and the egg yolk moisture content. Conclusion: In general, dietary mulberry leaves improved the growth, production performance, and immunological parameters in poultry and livestock, although the effects varied at different doses.

• 한국수산과학회지
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• 제41권2호
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• pp.125-133
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• 2008

To investigate the effect of repeated food deprivation and refeeding on the hyperphagia, compensatory growth, feed efficiency, body composition, hepatosomatic index (HSI), and survival rate of the juvenile olive flounder Paralichthys olivaceus, an experiment was conducted for 90 days. Feeding treatments consisted of the following five regimes for 90 days from August to October, 2005: C: daily satiation feeding (control), S1: 1-day satiation feeding after 1-day food deprivation, S2: 1-day satiation feeding after 2-day food deprivation, S3: 1-day satiation feeding after 3-day food deprivation and S4: 1-day satiation feeding after 4-day food deprivation, respectively. Although the monthly feed intake (MFI) of the control was significantly higher than that of all of the starved groups, the daily feed intake (DFI) was more higher in S1, S2, and S3 than that in the control as a result of hyperphagia after starvation. While the feed efficiency in the summer (to day 30) decreased in all of the starved groups with prolongation of the starvation period, the feed efficiency in the autumn (to day 90) was increased with prolongation of the starvation period. The whole body proximate composition and HSI were also affected by starvation. The crude protein, lipid, and HSI decreased with prolongation of the starvation period, whereas the crude ash and moisture increased. The growth rate and condition factor also decreased in proportion to the starvation period. The survival rate was highest in the control and was the lowest in S4. In this study, although hyperphagia occurred in the deprived groups, we knew that the compensatory growth did not always occur.

• Journal of Animal Science and Technology
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• 제49권2호
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• pp.195-202
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• 2007

돼지의 중요한 경제형질인 성장형질은 검정기간동안의 증체량이나 특정한 체중에 도달하는 일수를 측정한다. 그러나 성장형질은 개체의 능력외의 다른 요인에 의해서도 영향을 받는다. 유전능력 평가를 위해서는 합리적인 측정치를 이용하여 불필요한 오류를 줄여야 한다. 이러한 요인에 의한 성장률의 차이를 줄이기 위하여 경남첨단양돈연구소의 경남흑돈(Berkshire) 1,576두의 자료를 가지고 성장곡선을 추정하여 성장곡선에 의해 일당증체량과 90kg 도달일령을 각각 추정하였다. 기존의 방법들과 정확도를 직접적으로 비교할 수 없으나 추정하는 방법론에 있어서 더 정교하여졌다. 이론적 우수성은 일당 증체량에서는 성장곡선상의 같은 연령을 비교하고, 90kg 도달일령에서는 종료체중 측정일에서 90kg 도달일까지의 일수를 개체의 성장곡선상의 일 증체량으로 계산하는 데에 있다. 또한 컴퓨터를 활용한다면 품종이나 성과 같은 요인들에 대해서도 이 추정방법을 쉽게 각각 적용할 수 있다.

• 한국수산과학회지
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• 제45권6호
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• pp.679-685
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• 2012

A study was carried out to observe the effects of feed types on the growth, feed preference, and enteric feed transition rate of juvenile starry flounder, Platichthys stellatus for 45 days. Fifty fish (avg. 135 g) were stocked each in replication, and fed a commercial extruded pellet diet (EP, 45% protein) and a moist pellet diet (MP, 65% raw mackerel+35% feed powder in wet basis), respectively. The MP presented the higher performance than that of the EP on the feed efficiency ($68.3{\pm}0.9%$ for EP and $92.3{\pm}4.3%$ for MP) and the specific growth rate ($1.07{\pm}0.07$ for the EP and $1.20{\pm}0.05%$ for the MP). In contrast, the EP showed the higher feed preference in terms of the daily feed intake ($1.57{\pm}0.08%$ for the EP and $1.30{\pm}0.01$ for the MP) and the ad libitum feeding rate after a fast of 72 hours (1.73% for the EP and 1.35% for the MP). The feed transition rate through intestinal canals decreased exponentially in both the EP and the MP, showing the faster transition rate with the EP. In the result, starry flounder appeared to have the better feed preference to the EP, but have the higher feed efficiency and growth performance to the MP.

• Asian-Australasian Journal of Animal Sciences
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• 제14권9호
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• pp.1245-1249
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• 2001

A study was conducted with 14 gayals to study their growth pattern from birth to 24 months of age, and gayal was compared with native calves and crossbred calves of gayals and exotic animals. A significant difference in liveweight gains up to 3 months (p<0.001) or up to 6 months (p<0.05) was found between gayal and native calves, but the difference reduced with increase of age and found non-significant (p>0.05) at 9 months and 12 months. The daily liveweight gain up to 3, 6, 9 or 12 months of age of gayals were 404.60, 306.80, 315.20 and 312.20 g/d, respectively and of native calves were 217.3, 245.3, 262.0 and 269.0 g/d, respectively. Gayal female calves had lower weights at birth (20.2 kg) and weaning (81.8 kg) and daily liveweight gains (298.5 g/d) than males (24.3 kg, 84.0 kg and 317.8 g/d, respectively) but the differences were not significant (p>0.05). Cross breeding gayal cows with Friesian bulls increased daily liveweight gain of the crossbred calves. The rate of increase of daily liveweight gain may further be increased if gayals are crossed with beef type animals, and optimum feeding may also be required which needs further research.