• Asian-Australasian Journal of Animal Sciences
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• 제27권12호
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• pp.1705-1711
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• 2014

The objective of this study was to evaluate the effect of ruminally protected amino acids (RPAAs) and ruminally protected fat (RPF) supplementation on ruminal fermentation characteristics (in vitro) and milk yield and milk composition (in vivo). Fourteen mid-lactating Holstein dairy cows (mean weight $653{\pm}62.59kg$) were divided into two groups according to mean milk yield and number of days of postpartum. The cows were then fed a basal diet during adaptation (2 wk) and experimental diets during the treatment period (6 wk). Dietary treatments were i) a basal diet (control) and ii) basal diet containing 50 g of RPAAs (lysine and methionine, 3:1 ratio) and 50 g of RPF. In rumen fermentation trail (in vitro), RPAAs and RPF supplementation had no influence on the ruminal pH, dry matter digestibility, total volatile fatty acid production and ammonia-N concentration. In feeding trial (in vivo), milk yield (p<0.001), 4% fat corrected milk (p<0.05), milk fat (p<0.05), milk protein (p<0.001), and milk urea nitrogen (p<0.05) were greater in cows fed RPAAs and RPF than the corresponding values in the control group. With an index against as 0%, the rates of decrease in milk yield and milk protein were lower in RPAAs and RPF treated diet than those of basal diet group (p<0.05). In conclusion, diet supplemented with RPAAs and RPF can improve milk yield and milk composition without negatively affecting ruminal functions in Holstein dairy cows at mid-lactating.

• Journal of Animal Science and Technology
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• 제56권3호
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• pp.11.1-11.9
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• 2014

This study was conducted to evaluate the effects of dietary conjugated linoleic acid (CLA) on the performance of lactating sows and piglets as well as the immunity of piglets suckling from sows fed CLA. Eighteen multiparous Duroc sows with an average body weight (BW) of $232.0{\pm}6.38kg$ were randomly selected and assigned to two dietary treatments (n = 9 for each treatment), control (no CLA addition) and 1% CLA supplementation. For the control diet, CLA was replaced with soybean oil. Experimental diets were fed to sows during a 28-day lactation period. Litter size for each sow was standardized to nine piglets by cross-fostering within 24 hours after birth. Sow milk and blood samples were taken from sows and piglets after 21 and 27 days of lactation, respectively. Loss of BW was significantly (p < 0.05) higher in sows fed control diet compared to sows fed CLA diet. Piglet weights at weaning and weight gain during suckling were significantly (p < 0.05) higher in sows fed CLA compared to sows fed control diet. Serum non-esterified fatty acid (NEFA) and urea nitrogen concentrations were significantly (p < 0.05) lower in sows fed CLA than in sows fed soybean oil. IgG concentrations of the groups supplemented with CLA increased by 49% in sow serum (p < 0.0001), 23% in milk (p < 0.05), and 35% in piglet serum (p < 0.05) compared with the control group. Sows fed CLA showed an increase of 10% in milk yield compared with sows fed soybean oil (p < 0.05), even though there was no difference in daily feed intake between the treatments. Milk fat content was significantly (p < 0.05) lower in sows fed CLA than in sows fed soybean oil. Solid-not-fat yield was significantly (p < 0.05) higher in sows supplemented with CLA than in sows fed control diet and also protein-to-fat ratio in milk was significantly (p < 0.05) higher in sows fed CLA compared with the control group. The results show that CLA supplementation to sows increased milk yield without losing BW during lactation, whereas soybean oil supplementation resulted in severe BW loss.

• Asian-Australasian Journal of Animal Sciences
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• 제29권4호
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• pp.500-508
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• 2016

This study was conducted to investigate the effects of Momordica charantia saponin (MCS) on ruminal fermentation of maize stover and abundance of selected microbial populations in vitro. Five levels of MCS supplements (0, 0.01, 0.06, 0.30, 0.60 mg/mL) were tested. The pH, $NH_3-N$, and volatile fatty acid were measured at 6, 24, 48 h of in vitro mixed incubation fluids, whilst the selected microbial populations were determined at 6 and 24 h. The high dose of MCS increased the initial fractional rate of degradation at t-value = 0 ($FRD_0$) and the fractional rate of gas production (k), but decreased the theoretical maximum of gas production ($V_F$) and the half-life ($t_{0.5}$) compared with the control. The $NH_3-N$ concentration reached the lowest concentration with 0.01 mg MCS/mL at 6 h. The MSC inclusion increased (p<0.001) the molar proportion of butyrate, isovalerate at 24 h and 48 h, and the molar proportion of acetate at 24 h, but then decreased (p<0.05) them at 48 h. The molar proportion of valerate was increased (p<0.05) at 24 h. The acetate to propionate ratio (A/P; linear, p<0.01) was increased at 24 h, but reached the least value at the level of 0.30 mg/mL MCS. The MCS inclusion decreased (p<0.05) the molar proportion of propionate at 24 h and then increased it at 48 h. The concentration of total volatile fatty acid was decreased (p<0.001) at 24 h, but reached the greatest concentration at the level of 0.01 mg/mL and the least concentration at the level of 0.60 mg/mL. The relative abundance of Ruminococcus albus was increased at 6 h and 24 h, and the relative abundance of Fibrobacter succinogenes was the lowest (p<0.05) at 0.60 mg/mL at 6 h and 24 h. The relative abundance of Butyrivibrio fibrisolvens and fungus reached the greatest value (p<0.05) at low doses of MCS inclusion and the least value (p<0.05) at 0.60 mg/mL at 24 h. The present results demonstrates that a high level of MCS quickly inhibits in vitro fermentation of maize stover, while MCS at low doses has the ability to modulate the ruminal fermentation pattern by regulating the number of functional rumen microbes including cellulolytic bacteria and fungi populations, and may have potential as a feed additive applied in the diets of ruminants.

• Asian-Australasian Journal of Animal Sciences
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• 제26권4호
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• pp.529-536
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• 2013

The objective of this study was to investigate the effect of levels of cottonseed meal with various carbohydrate sources in concentrate on feed intake, nutrient digestibility, rumen fermentation and microbial protein synthesis in dairy bulls. Four, 6 months old dairy bulls were randomly assigned to receive four dietary treatments according to a $2{\times}2$ factorial arrangement in a $4{\times}4$ Latin square design. Factor A was carbohydrate source; cassava chip (CC) and cassava chip+rice bran in the ratio of 3:1 (CR3:1), and factor B was cotton seed meal levels in the concentrate; 109 g CP/kg (LCM) and 328 g CP/kg (HCM) at similar overall CP levels (490 g CP/kg). Bulls received urea-lime treated rice straw ad libitum and were supplemented with 10 g of concentrate/kg BW. It was found that carbohydrate source and level of cotton seed meal did not have significant effects on ruminal pH, ammonia nitrogen concentration, microbial protein synthesis or feed intake. Animals which received CC showed significantly higher BUN concentration, ruminal propionic acid and butyric acid proportions, while dry matter, organic matter digestibility, populations of total viable bacteria and proteolytic bacteria were lower than those in the CR3:1 treatment. The concentration of total volatile fatty acids was higher in HCM than LCM treatments, while the concentration of butyric acid was higher in LCM than HCM treatments. The population of proteolytic bacteria with the LCM treatments was higher than the HCM treatments; however other bacteria groups were similar among the different levels of cotton seed meal. Bulls which received LCM had higher protein digestibility than those receiving HCM. Therefore, using high levels of cassava chip and cotton seed meal might positively impact on energy and nitrogen balance for the microbial population in the rumen of the young dairy bull.

• Asian-Australasian Journal of Animal Sciences
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• 제33권6호
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• pp.921-929
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• 2020

Objective: The aim of the present study was to investigate the beneficial effects of dietary supplementation with oil palm frond (leaf) (OPF) with and without oil palm meal (OPM) on nutrient intake and digestibility, ruminal fermentation and growth performance in goats. Methods: Six female crossbred goats were fed for 28 days of 3 diet treatments; 100% para-grass (T1); 50% para-grass + 50% OPF (T2), and 30% para-grass + 50% OPF + 20% OPM (T3). Body weight, rectal temperature, respiratory rate, and urine volume, food intake, dry matter intake and water intake were measured daily. Nutrient digestibility was determined from five consecutive days of last week in each diet. Ruminal fluid, urine and blood were collected at the end for determination of rumen protozoa and volatile fatty acid contents, urinary allantoin excretion, blood cell count and chemistry profiles. Results: Goats fed T2 and T3 showed higher dry matter and nutrients intakes while protein digestibility was suppressed compared with those for T1. Crude fat digestibility declined in T2 but maintained after adding the OPM (T3). High fat intake by giving OPF and OPM corresponded to a higher ruminal acetate/propionate ratio (C2/C3) and serum cholesterol level. An increased urinary allantoin/creatinine ratio was found in T2 and T3 compared with T1, implying an increased number of ruminal microbes. Conclusion: Increased dry matter intake in T2 and T3 suggested that oil palm by-products are partly useful as a replacement for para-grass in goats. Replacement with the by-products increased plasma cholesterol level, which suggested that these products are a useful energy source. Changes in rumen parameters suggested an increased microbial number and activity suitable for acetate production. However, the limited digestibility of protein implies that addition of high protein feeds may be recommended to increase body weight gain of goats.

• 한국가금학회지
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• 제43권1호
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• pp.15-20
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• 2016

이 연구는 꾸지뽕 열매(Cudrania tricuspidata fruit; CTF)의 산란계에 급여가 생산 능력, 계란의 품질, 지방산, 혈중 콜레스테롤, 면역글로불린에 미치는 영향을 구명하고자 시행하였다. 48주령 산란계 닉브라운 288수를 4개 처리구 4반복 반복 당 18수씩 개체별 케이지에 배치하였으며, 처리구는 건조된 꾸지뽕 열매를 0, 0.25, 0.50, 1.00% 첨가하여 급여하였다. 기초사료의 ME와 CP는 2,800 kcal/kg, 16.0% 수준으로 하였으며, 산란율, 1일 산란량은 CTF 1% 급여구에서 다른 처리구에 비하여 현저하게 증가하였으며(P<0.05), 사료섭취량은 처리구 간에 차이가 없었지만, 사료요구율은 CTF 1.0% 급여구에서 다른 처리구보다 현저하게 개선되어 통계적으로 차이를 보였다(P<0.05). 알부민의 높이, 호유닛과 난각강도는 CTF 첨가로 인하여 개선되는 경향을 보였지만, 통계적인 차이는 없었다. 난황색도는 CTF 첨가 수준이 증가함에 따라서 증가하였다(P<0.05). 난황의 지방산은 일관성은 없었지만, n6/n3 비율이 CTF 처리구에서 대조구에 비하여 높게 나타났다. 혈중 콜레스테롤과 TG는 CTF 급여구에서 대조구보다 매우 낮았으며(P<0.05), 면역글로불린은 CTF 처리구에서 대조구보다 높게 나타났다(P<0.05). 이 실험 결과 산란계 사료에 CTF 1% 첨가는 생산능력과 계란 품질을 개선하였지만, 혈중 콜레스테롤, TG, IgG는 CTF 0.25% 수준으로 충분하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제28권3호
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• pp.382-390
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• 2015

This work was conducted to investigate the performance and meat characteristics of commercial Korean native duck (KND). A total of 180 1-d-old ducklings of 2-way crossbreds from A and B lines (from National Institute of Animal Science) were used in this work and divided into 4 groups (3 replicates/group, 15 birds/replicate). The four groups were 4 crossbreds as AA (A line [♀]${\times}$A line [♂]), AB (A line [♀]${\times}$B line [♂]), BB (Pure line B strains) and BA (B strains [♀]${\times}$A strain [♂]). Ducks were fed diets based on corn-soybean meal for 0 to 3 wk (22.4% crude protein [CP], 2,945 kcal/kg metabolizable energy [ME]) and 3 to 8 wk (18.4% CP, 3,047 kcal/kg ME). As a result of this study, average body weight of 4 crossbreds were 625, 1,617, 2,466, and 2,836 g at 2, 4, 6, and 8 weeks, respectively, and significantly increased over the period of time (p<0.05). Body weight of BB group was greater than other crossbreds at the age of 6 weeks (p<0.05). There was a significant difference in weekly body weight gains (p<0.05), which were 573, 991, 850, and 371 g at 2, 4, 6, and 8 weeks old, respectively. Uniformity of 4 crossbreds was 84.9%, 80.5%, and 72.5% at 6, 7, and 8 weeks, respectively, and there was no difference among crossbreds. Body weight gain of BB crossbred was highest among crossbreds (p<0.05). Weekly feed intake significantly increased with weeks as 669, 1,839, 2,812, and 3,381 g at 2, 4, 6, and 8 weeks respectively (p<0.05). Feed intakes of AA and BB crossbreds were higher at 2 to 4 weeks old than others and that of BB crossbred was highest at 4 to 6 weeks old (p<0.05). Weekly feed conversion ratios were 1.17, 1.86, 3.32, and 9.37 at 0 to 2, 2 to 4, 4 to 6, and 6 to 8 weeks old, respectively, and it increased with age (p<0.05). There was no significant difference in feed conversion ratio among crossbreds. Carcass yields of 4 crossbreds were 73.6%, 71.6%, 73.5%, and 71.7%, respectively, so there was no significant difference among crossbreds. There was no difference in wing, neck, breast and leg ratios among crossbreds. However, back ratios of 4 crossbreds were 17.6%, 18.0%, 15.8%, and 17.6%, respectively, and back ratio of BB was the highest among crossbreds. Finally, these results may provide the basic data on the production, carcass quality, fatty acid and amino acid composition of commercial KND with 2-way crossbreeding.

• Journal of Animal Science and Technology
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• 제45권6호
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• pp.987-996
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• 2003

본 실험은 수준별 산삼 배양액에 의한 반추위 내 미생물 발효성상에 미치는 영향에 대하여 조사하기 위해 실시되었다. 산삼 배양액의 수준에 따른 반추위 내 발효성상에 미치는 영향은 WGM을 3% 첨가한 처리구가 대조구 및 다른 WGM 수준 첨가 처리구에 비하여 미생물 단백질 합성량이 가장 높게 나타났다. 산삼 배양액 내에 존재하는 saponin의 영향으로 배양 초기 NH3-N 농도의 수준이 WGM를 첨가한 처리구가 대조구에 비해 낮은 경향(P〈0.05)을 보였으나, 미생물단백질 합성량은 WGM 처리구에서 6시간 이후 급격히 증가(P〈0.05)하는 경향을 나타내었다. 따라서 용해도가 높거나 급여 초기 사료의 이용율이 저하되는 급여 체계에서 산삼 배양액을 첨가는 초기 반추위 미생물의 이용율을 조절할 수 있을 것으로 사료된다. 반추위 내 프로토조아의 수는 WGM 처리구에서 전반적으로 배양 9시간까지 낮아졌고, 3% 처리구에서 가장 낮았는데(P〈0.05), 프로토조아 제거효과에 의해 반추위 미생물합성량 증진시키는 효과를 나타내었다. NDF와 ADF 소화율은 대조구와 모든 처리구에서 배양시간 경과에 따라 높아졌고, NDF 소화율은 대조구와 WGM 3% 처리구에서 그리고 ADF 소화율은 처리구별 차이가 없었다. Total VFA 생성량은 처리구가 대조구에 비해 낮았고, 배양 12시간부터는 5% 처리구에서 차이가 없게 나타났다. 따라서 용해도가 높거나 급여 초기 사료의 이용률이 저하되는 급여 체계에서 산삼 배양액을 첨가는 초기 반추위 미생물의 사료 이용률 증진과 프로토조아 제거효과에 의해 반추위 미생물합성량 증진에 도움이 될 수 있을 것이다.

• Journal of Nutrition and Health
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• 제41권8호
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• pp.754-766
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• 2008

본 연구는 대구 경북지역의 유방암 환자와 대조군을 대상으로 열량 및 영양소 섭취수준에 따른 유방암 발생의 상대 위험도를 분석하였다. 조사 대상자는 경북대학교 병원에서 유방암 진단을 처음 받고 입원한 103명의 유방암 환자와 유방암과 관련된 질환 및 전신 질환이 없으면서 연령(5세 내의 차이) 및 폐경 상태가 동일한 사람들을 대상으로 빈도 짝짓기를 통하여 선정한 159명의 지역사회 대조군이었다. 이들의 반정량적 식품섭취 빈도조사 결과를 분석하여 영양 섭취량을 산출하였고, 일반 특성에 대한 분석 결과에서 환자군과 대조군간 유의한 차이를 보인 요인들을 혼란변수로 통제한 후 열량 및 영양섭취 수준에 따른 상대 위험도를 분석하였다. 전체적으로 높은 BMI와 열량과 당질의 높은 섭취 수준은 유방암 발생의 상대적 위험을 유의하게 높이는 것으로 나타났고, 총 지방, 식이섬유, 포화지방산, 단일불포화지방산, 다불포화지방산, n-3 지방산, n-6 지방산, 비타민 E, 칼슘은 섭취수준이 높을수록 위험도가 유의하게 낮아지는 것으로 나타났다. 폐경 전 여성에서는 당질의 섭취 수준이 높을 때 유방암 위험이 유의하게 높고, 총지방, 식이섬유, 포화지방산, 단일불포화지방산, 다불포화지방산, n-6 지방산, 비타민 E, 엽산, 칼슘, 인, 칼륨의 섭취 수준이 높을 때 위험도가 유의하게 낮은 것으로 나타났다. 폐경 후 여성에서는 총지방, 콜레스테롤, 다불포화지방산, n-6 지방산의 섭취 수준이 높을 때 유방암 위험도가 유의하게 낮은 것으로 나타났다. 특히 지방의 경우 식물성 급원의 섭취 수준이 높을 때 유방암의 위험이 유의하게 감소되는 것으로 나타났다. 이상의 결과에서 대구 경북지역에서 유방암 발생 위험을 높일 가능성이 있는 영양섭취상태는 열량과 당질의 높은 섭취이며, 한편 유방암의 위험을 낮출 가능성이 있는 영양섭취 상태는 높은 지방의 섭취로 나타났다. 특히 지방의 경우 식물성 급원의 섭취가 높을 때 위험이 낮아지는 것으로 나타났다. 이는 지방 섭취량과 유방암 위험도 사이에 정의 상관성을 보고한 일부 국외의 연구 결과와는 상반되는 결과이며 그 원인으로는 한국인의 경우 식물성 지방 섭취의 비율이 서구인에 비해 상대적으로 높기 때문인 것으로 추정된다. 유방암의 위험을 낮출 가능성이 있는 미량 영양소로는 비타민 중에는 E와 엽산, 무기질로서는 칼슘, 인 그리고 칼륨으로 나타났다. 본 연구결과의 제한점으로서 조사 사례수가 적다는점을 들 수 있으므로 선행연구들의 결과와 상반된 결과를 보인 지방섭취와 유방암 위험과의 관련성에 대해서는 향후보다 많은 사례를 대상으로 한 조사 연구를 통해 재확인할 필요가 있다고 보며, 본 연구의 결과는 지역민의 유방암 예방을 위한 영양교육 자료의 일부로서 활용될 수 있다고 본다.

• Asian-Australasian Journal of Animal Sciences
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• 제33권1호
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• pp.91-99
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• 2020

Objective: This study investigated the effects of oral administration of rumen-protected L-tryptophan (RPL-T) on duodenal starch digestion and gastrointestinal hormones (GIH) secretions using Hanwoo beef steers as the animal models. Methods: Four steers (423±24 kg) fitted with ruminal and duodenal cannulas were employed in a crossover design replicated twice. Treatments were control (basal diet) and RPL-T (basal diet+191.1 mg/kg body weight [BW]) group. Blood and duodenal samples were collected to measure serum GIH levels and pancreatic α-amylase activity at day 0, 1, 3, and 5 (-30, 30, 90, 150, and 210 min) of the study. Samples from each segment of the gastrointestinal tract were collected via ruminal and duodenal cannulas and were used to determine soluble protein and the starch digestion rate at days 6 (-30, 180, 360, and 540 min) and 8 (-30, 90, 270, and 450 min) of the experiment. Results: No significant difference in ruminal pH, NH₃-N, and total volatile fatty acid including the levels of acetate, propionate, butyrate, isobutyrate, valerate, isovalerate, and the acetate-to-propionate ratio was observed between groups (p>0.05). Crude protein uptake was higher and feces starch content was lower in RPL-T group than the control group (p<0.05). The D-glucose contents of feces in RPL-T group decreased at day 5 compared to those in the control group (p<0.05), however, no change was found at day 0, 1, or 3 compared to the control group (p>0.05). Serum cholecystokinin (CCK), melatonin, duodenal pancreatic α-amylase activity, and starch digestion were significantly higher in RPL-T group than the control group (p<0.05). Conclusion: Taken together, oral administration of RPL-T at the rate of 191.1 mg/kg BW consistently increased CCK concentration, pancreatic α-amylase activity in duodenal fluids, and starch digestion rate in the small intestine and thus found to be beneficial.