• 농업과학연구
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• 제11권2호
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• pp.303-314
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• 1984

In order to study the safety of ginseng ingested as a food substance, rats were fed ginseng added feed (subgroup 1: 0.625g/kg feed; subgroup 2: 1.25g/kg feed; subgroup 3: 2.5g/kg feed) for periods up to 6 months. Growth rates, blood composition, blood cell counts, and histopathological studies were carried out on both the control and test animals to study the effect of ingested ginseng. Following results were obtained: 1. The growth rates of the test and control animals were similar with the exception of the subgroup 3 in the 2-month fed animals who had a lower weight gain, and the subgroup 2 in the 4-month fed group who had a higher weight gain than the controls. 2. Liver, spleen, kidney, brain, lung and heart weights were similar between the test and the controls. 3. RBC, WBC, hematocrit, and hemoglobin values were similar between the test and control animals. the blood composition determination showed a similar level of alkaline phosphatase, triglyceride, total cholesterol, S-GOT, free cholesterol between the test and controls. However, free fatty acid, total lipid and S-GPT levels decreased while phospholipid, total protein, and HDL-cholesterol levels tended to increase. 4. Fl, F2 generations showed no abnormai values in blood count, organ weight and external appearance. 5. No histopathological differences were observed between the test and control animals even after a long-term administration of ginseng. However, there was evidence that ginseng promotes hematopoiesis in test animals. 6. These results suggest that ginseng is not only safe as a food substance but may indeed strengthen the body and help-prevent diseases of old age.

• Animal Bioscience
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• 제37권2_spc호
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• pp.385-395
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• 2024

Ruminal ciliates are a fundamental constituent within the rumen microbiome of ruminant animals. The complex interactions between ruminal ciliates and other microbial guilds within the rumen ecosystems are of paramount importance for facilitating the digestion and fermentation processes of ingested feed components. This review underscores the significance of ruminal ciliates by exploring their impact on key factors, such as methane production, nitrogen utilization efficiency, feed efficiency, and other animal performance measurements. Various methods are employed in the study of ruminal ciliates including culture techniques and molecular approaches. This review highlights the pressing need for further investigations to discern the distinct roles of various ciliate species, particularly relating to methane mitigation and the enhancement of nitrogen utilization efficiency. The promotion of establishing robust reference databases tailored specifically to ruminal ciliates is encouraged, alongside the utilization of genomics and transcriptomics that can highlight their functional contributions to the rumen microbiome. Collectively, the progressive advancement in knowledge concerning ruminal ciliates and their inherent biological significance will be helpful in the pursuit of optimizing rumen functionality and refining animal production outcomes.

• Asian-Australasian Journal of Animal Sciences
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• 제24권6호
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• pp.791-799
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• 2011

This study examined the effect of restricting feed intake and the subsequent compensatory growth in Guzera females. Eighteen animals with an initial age of 21 months and a mean weight of 268.17 kg were placed in three groups according to the alimentary regime: feed ad libitum; feed restricted to 20% dry matter; and feed restricted to 40% dry matter. In the restricted feed phase, the dry mater intake decreased as the restriction levels increased, influencing the reduction in intake of other nutrients. In the realimentation phase, the 40% restricted feed group ingested more dry matter (% BW) and crude protein ($weight^{0.75}$) than the group fed ad libitum (p<0.001). The serum nutrient concentrations were inversely proportional (p<0.001) to the restriction level, and there was no difference (p>0.001) in the realimentation phase. In the restricted feed phase, the final live weight decreased (p<0.05) as the restriction level increased. For the daily mean weight gain in the control group, there was no difference (p>0.05) compared to the animals with 20% feed restriction, but this was higher than in the group with 40% feed restriction. In the re-alimentation phase, the group with 40% feed restriction achieved higher weight gain rates, which was different from the control and 20% restriction groups. In both phases, the animals in the group with 40% feed restriction presented better feed conversion which was different (p<0.05) from the control group. In the feed restriction phase, it was observed that the intake of N, nitrogen excreted in feces and urine, nitrogen balance and nitrogen retention decreased (p<0.05) with the restriction level. None of the variables were influenced in the re-alimentation phase. These results show that feed restriction by 40% can be adopted as a nutritional management practice.

• 유기물자원화
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• 제4권2호
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• pp.35-45
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• 1996

분뇨슬러지에서의 지렁이의 생육과정을 추적하고, 분립의 안전성을 평가하여 Vermicomposting에 의한 효율적인 분뇨슬러지의 처리가능성을 검토하였다. 지렁이의 생존율은 사육기간이 길어짐에 따라서 저하하였는데, 1주에서 99.3%가 7주에서는 52.0%로 감소하였다. 지렁이의 사육기간을 분뇨슬러지 섭취량에 대한 분립생산량의 비율로서 2단계로 구분할 수 있다. 즉, 3주까지는 먹이섭취량이 지렁이의 증체에 이용되었으나, 그 이후의 사육기간에서는 먹이섭취량이 분립생산에 이용되었다. 지렁이의 증체속도와 현존량은 3주에서 각각 10.59mg/day과 14.48g으로, 다른 사육기간보다 높은 값을 나타내었다. 또한 증체속도와 현존량과의 관계는 0.1% 수준의 유의한 정상관이 인정되었다. 지렁이의 현존량은 3주에서 가장 높은 값을 나타내었으나, 분립생산량은 3주 이후 7주까지 점차적으로 증가하여 7주에서 최고 값을 나타내었다. 분립의 무기물 함량은 분뇨슬러지보다 낮은 값을 나타내었는데, 분립의 무기물 함량이 낮았던 원인은 지렁이의 사육과정중에서 무기물의 체내축적이 많았기 때문이라고 생각된다. 또한 분립의 무기물 함량(중금속)은 유기질 비료의 허용규제치 이하의 값을 나타내어 안전성이 높았다고 생각된다.

• Fisheries and Aquatic Sciences
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• 제27권3호
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• pp.195-205
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• 2024

Amphipoda is a benthic fauna occupying aquatic environments that can be used as a live feed for mud crabs. The abundance of amphipods in the water is thought to impact the preying capacity of crablets, which in turn will affect their growth performance. This study aims to determine the preying capacity of the crablet stage of Scylla tranquebarica exposed at different densities (20, 30, and 40 amphipods / 0.5 L) of amphipod, Grandidierella megnae. The preying capacity was estimated by counting the number of amphipods ingested by an individual crablet during the 60-day rearing period. The main parameters measured were daily consumption rate (DCR), Cumulative molting (CM), Feed conversion ratio (FCR), and the specific growth rate of weight (SGR-W). The results showed that the DCR and FCR were not affected by amphipod densities but the higher the amphipod density the higher the SGR-W and CM. Based on this study, 30 amphipods / 0.5 L is recommended as the optimal density to optimize the DCR and improve the growth performance of crablets. It is also proposed that surplus live feed will potentially reduce the cannibalism rate of crablets during weaning. However, more research needs to be carried out to elucidate the benefits of crablet-feeding amphipods in communal systems.

• International journal of advanced smart convergence
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• 제13권1호
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• pp.194-200
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• 2024

In the past, antibiotics and antimicrobial substances have been used for the purpose of promoting the growth of livestock or treating livestock, but various problems such as the presence of livestock products or resistant bacteria have emerged. Recently, regulations on the use of antibiotics have been strengthened worldwide, and probiotics are attracting attention as an alternative. Probiotic microorganisms have already been used for human use, such as intestinal abnormal fermentation, diarrhea, and indigestion. In livestock, beneficial microorganisms are increasing in use for the purpose of improving productivity, such as promoting livestock development and preventing diarrhea. Therefore, it is advisable to understand livestock probiotics in deeper and think about effective uses. The role of probiotics in the livestock sector is made with microorganisms themselves, so it is a substance that promotes livestock growth and improves feed efficiency by settling in the intestines of livestock, suppressing the growth of other harmful microorganisms, helping digestion and absorption of ingested feed, and helping to synthesize other nutrients. There is a need for a probiotic that suppresses intestinal bacteria by supplying probiotics used as a means to minimize the effects of stress in livestock management, thereby suppressing disease outbreaks by maintaining beneficial microorganisms and suppressing pathogenic microorganisms. The purpose of this paper is to develop a brand of feed additive probiotics to improve health conditions due to increased feed intake, improve the efficiency of use of feed nutrients, inhibit the decomposition and production of toxic substances, increase immunity, reduce odor in livestock, and improve the environment. We investigated and analyzed feed additive probiotics already on the market, and developed the naming and logo of suitable feed additive probiotic brands in livestock. We hoped that the newly developed product will be used in the field and help solve problems in the livestock field.

• 대한수의학회지
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• 제24권1호
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• pp.24-30
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• 1984

The protective effects of high levels of dietary iron, copper, zinc or protein on lead toxicity were studied In chicks. Growth retardation, reduction of feed intake, anemia and accumulation of lead in the bone and kidney were observed in chicks fed a diet containing 500mg lead as chloride per kg of feed for 42 days. Early changes due to ingested lead were inhibition of red blood cell ${\delta}$-aminolevulinic acid dehydrase at all doses and no effect of iron, copper, zinc or protein addition were observed. Tibia lead accumulation was reduced in chicks receiving additional dietary iron or zinc compared to the lead only group but increased in chicks given supplementary protein. Decreased body weight gain was overcome by supplementary zinc or protein in chicks fed lead but not by supplementary iron. Overall the results of this study show that lead poisoning can be partly reduced by providing supplementary iron, zinc or protein, but the interaction of these element remained to be elucidated.

• Asian-Australasian Journal of Animal Sciences
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• 제27권1호
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• pp.24-29
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• 2014

The objective of this study was to assess the effect of substituting corn with soybean hulls on the ingestive behavior and nitrogen balance of Santa Ines lambs. A total of 25 lambs with an initial body weight of $20{\pm}2$ kg at approximately six months of age, sheltered individually in stalls ($1.10m{\times}1.0m$), considering an entirely casual experimental delineation. Soybean hulls were substituted for corn at 0, 250, 500, 750, and 1,000 g/kg of dry matter (DM). The time spent feeding, ruminating, masticating, and resting was not affected by the substitution of corn with soybean hulls. In fact, the feeding efficiency in g DM/h and the rumination efficiency in g DM/bolus increased linearly with soybean hull substitution in the feed. Although the nitrogen balance was not altered by the use of soybean hulls as a substitute for corn in the diets of Santa Ines lambs, the N ingested and N digested expressed in g/d, N retained as a percentage of that ingested, and N retained as a percentage of that digested displayed quadratic behavior. In conclusion, corn can be substituted with soybean hulls up to 1,000 g/kg of dry matter in the concentrate, without changing the ingestive behavior and nitrogen balance.

• Asian-Australasian Journal of Animal Sciences
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• 제13권10호
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• pp.1394-1398
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• 2000

This experiment was carried out to examine the seasonal changes in feed intake and feeding behavior in Korean spotted deer under farmed condition to obtain basic information for efficient feeding management. The seasonal daily gain was the highest (p<0.05) in summer and the lowest (p<0.05) in winter. Dry matter intake (DMI) was the highest (p<0.05) in spring (2,685 g/day) and the lowest in winter (1,929 g/day). Intake of roughage in the DMI was the greatest in spring and that in winter was significantly lower (p<0.05) than in spring. Also DMI, expressed in terms of metabolic body weight ($kgW^{0.75}$), was 85.5 g, 70.6 g, 70.9 g and 65.1 g for spring, summer, autumn and winter, respectively, and thus was the highest in spring and the lowest in winter (p<0.05). Deer exhibited similar eating patterns, comparatively short and frequent periods, in all seasons. They showed comparatively intensive patterns of rumination during midnight for autumn and winter and relatively continuous patterns of chewing activity during spring and summer. There were no significant differences in seasonal eating time and ruminating time. However, exercise time was the greatest for winter and the lowest for summer and there was a significant difference (p<0.05) between summer and winter. Although not significant, eating time per 100 gDM ingested tended to be short in spring and summer and long in autumn and winter. Ruminating time per 100 gDM ingested was the shortest (p<0.05) in spring compared with in other seasons. The conclusion can be drawn that since deer have seasonal differences in feed intake and feeding habits, it is necessary to establish and develop an efficient feeding system for deer.

• Asian-Australasian Journal of Animal Sciences
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• 제8권6호
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• pp.533-555
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• 1995

Direct-fed microbials (DFM) have been used to enhance milk production in lactating cattle and to increase feed efficiency and body weight gain in growing ruminants. Primary microorganisms that have been used as DFM for ruminants are fungal cultures including Aspergillus oryzae and Saccharomyces cerevisiae and lactic acid bacteria such as Lactobacillus or Streptococcus. Attempts have been made to determine the basic mechanisms describing beneficial effects of DFM supplements. Various modes of action for DFM have been suggested including : stimulation of ruminal microbial growth, stabilization of ruminal pH, changes in ruminal microbial fermentation pattern, increases in digestibility of nutrients ingested, greater nutrient flow to the small intestine, greater nutrient retention and alleviation of stress, however, these responses have not been observed consistently. Variations in microbial supplements, dosage level, production level and age of the animal, diet and environmental condition or various combinations of the above may partially explain the inconsistencies in response. This review summarizes production responses that have been observed under various conditions with supplemental DFM and also corresponding modification of ruminal fermentation and other changes in the gastrointestinal tract of ruminant animals.