• Asian-Australasian Journal of Animal Sciences
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• 제27권6호
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• pp.818-824
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• 2014

The nutrient composition of pasture, voluntary intake and digestibility of diet ingested by goats grazing on an introduced Leymus chinensis pasture were measured across spring (May), summer (July), autumn (October) and winter (March). In each season, 12 Inner Mongolian Cashmere goats (6 wethers and 6 does with an average live weight of $22.2{\pm}1.3$ kg and $19.5{\pm}0.8$ kg, respectively) were used to graze on a 2 hectares size paddock. Diet selection was observed and the plant parts selected by grazing goats and whole plant L. chinensis were sampled simultaneously. The alkane pair $C_{32}:C_{33}$ and $C_{36}$ were used to estimate intake and digestibility, respectively. The results showed that the plant parts selected by goats had higher crude protein (CP) and lower acid detergent fiber (ADF) and neutral detergent fiber (NDF) than the whole plant, especially in the autumn and winter. The voluntary intake of dry matter (DM), CP, ADF, NDF, and metabolizable energy (ME) by goats was highest in summer (p<0.05). The goats ingested more CP, ME, and less ADF in spring than in autumn (p<0.05). The intakes of DM, CP, and ME were lowest in winter (p<0.05). There were significant differences in nutrient intake between wethers and does in each season, except for the ADF and ME intake per metabolic weight ($LW^{0.75}$). The nutrient digestibilities were higher in spring and summer, and decreased significantly during the autumn and winter (p<0.05). Goats, especially wethers, had a relative constant NDF digestibility across seasons, however, the apparent digestibility of CP in both wethers and does, decreased to negative values in winter. The grazing goats experienced relatively sufficient nutrients supply in spring and summer, and a severe deficiency of CP and ME in winter.

• 한국초지조사료학회지
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• 제17권3호
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• pp.205-212
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• 1997

Forty-five holstein calves (average liveweight 150kg) were used to investigate the effect of combination of tall fescue and white clover cultivars on liveweight gain and feed efficiency into animal product in pastures. Daily gains per head for 3 years in T1, T2 and T3 (TI : Fawn, tall fescue + Regal, white clover + orchardgrass + perennial ryegrass, T2 : Roa, tall fescue + Regal, white clover + orchardgrass + perennial ryegrass, T3 : Roa, tall fescue + Tahora, white clover + orchardgrass + perennial ryegrass) were 0.27, 0.37 and 0.35kg, respectively, while average daily weight gains per ha were 3.54, 4.47 and 4.43kg, respectively. Animals grazing on mixed pasture with Roa tall fescue and Regal or Tahora white clover were showed a higher liveweight gain than those grazed on pastures with Fawn tall fescue and Regal h i t e clover. There was no significant difference among treatments (TI = 5.0kg T2 = 4.8kg T3 = 4.9kg) in herbage intake but feed efficiency into animal product was showed higher in T2 and T3 in comparison with T1(7.9% in T2 and 8.0% in T3 vs 5.97% in TI). In conclusion, association with Roa tall fescue and Regal white clover in mixed pasture can obtain higher animal product under continuous grazing system than that with Fawn tall fescue and Regal white clover.

• Animal Bioscience
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• 제36권9호
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• pp.1314-1326
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• 2023

Sheep and goats can efficiently convert low quality forage into high-quality meat which contains specific nutrients and quality traits. Carcass traits and quality attributes of sheep and goat meat depend upon several factors and one of most effective strategies amongst these is feeding regimens. In this review, the major aspects of feeding regimens affecting growth rate, carcass traits and quality attributes of sheep and goat meat are thoroughly discussed, with a particular focus on physical-chemical composition, flavor profile, and fatty acid (FA) profile. Grazing lambs and kids receiving concentrate or under stall-feeding systems had greater average daily gain and carcass yield compared with animals reared on pasture only. However, growth rate was higher in lambs/kids grazing on pastures of improved quality. Moreover, the meat of grazing lambs receiving concentrate had more intense flavor, intramuscular fat (IMF) content, and unhealthy FA composition, but comparable color, tenderness, juiciness, and protein content compared to that of lambs grazed on grass only. In contrast, meat of concentrate-fed lambs had more intense color, greater tenderness and juiciness, IMF and protein contents, and lower flavor linked to meat. Additionally, the meat of kids grazed on concentrate supplementation had higher color coordinates, tenderness, IMF content and unhealthy FA composition, whereas juiciness and flavor protein content were similar. In contrast, kids with concentrate supplementation had superior color coordinates, juiciness, IMF content and unhealthy FA composition, but lower tenderness and flavor intensity compared to pasture-grazed kids. Thus, indoor-finished or supplemented grazing sheep/goats had higher growth rate and carcass quality, higher IMF content and unhealthy FA composition compared to animals grazed on grass only. Finally, supplementation with concentrate increased flavor intensity in lamb meat, and improved color and tenderness in kid meat, whereas indoor-fed sheep/goats had improved color and juiciness as well as reduced flavor compared to pasture-grazed animals.

• 한국초지조사료학회지
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• 제41권4호
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• pp.250-258
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• 2021

본 연구는 엘크 암사슴(Cervus canadensis)의 사육방식에 따른 사료섭취량, 체중변화 및 자록의 성장에 미치는 영향을 확인하고 적정 방목강도를 구명하기 위하여 수행되었다. 본 실험에 사용된 공시가축은 3~4년생 엘크 암사슴 16두(평균체중 : 236.2 ± 15.7 kg)를 이용하였으며, 방목초지는 3년 이상된 톨 페스큐 위주의 기성 혼파초지로서 초종구성은 톨 페스큐(약 50%), 오차드그라스(약 10%), 켄터기 블루그라스(약 5%)와 피, 바랭이 등으로 구성되었다. 방목초지의 수분함량은 19.51~22.61%로 방목기간 동안 유사하였으며, 조단백질 함량은 6~7월에 유의적으로 높게 나타났다. 조지방과 조회분 함량은 가을로 갈수록 점차 증가하였으며, NDF와 ADF함량은 각각 53.65~60.18%과 26.08~29.10%로 조사되었다. 실험기간동안 보충사료 섭취량은 월별로 처리구 사이에 유의적인 차이가 나타나지 않았으나, 조사료와 총 건물섭취량은 5월을 제외하고 처리구 사이에 유의적인 차이가 나타났다 (p<0.05). 특히 8월에는 GR처리구의 조사료 섭취량이 급격히 감소하였는데, 여름철 환경변화에 따른 것으로 사료된다. 반면, 9월 포유를 위해 부족한 영양소를 섭취하기 위해 사초섭취량이 급격히 증가하였다. 우리 연구에서 암사슴의 채식패턴은 수사슴과 차이를 보였으며, 이는 실험기간 자록의 이유 및 포유기간에 따른 영향을 받은 것으로 사료된다. 본 실험에서 사양방식에 따른 엘크 암사슴의 체중은 유의적 차이가 나타나지 않았으나, GR처리구에서 자록의 성장률이 빠른 것으로 나타났다. 그러나, GR처리구에서 BF처리구에 비해 낮은 이유율이 나타나 분만 전후 사사사육을 통해 이유율을 높여주는 것이 필요할 것으로 판단되며, 목지 내에서 분만 시 포유경험이 있는 산차가 높은 암사슴을 이용하고 방목강도를 높여주는 것이 이유율을 향상시키는 데 도움을 줄 수 있을 것으로 사료된다. 엘크 암사슴의 방목강도는 연평균 15두/ha로 나타났는데, 이는 다마 암사슴(Dama dama)에 비해서는 체중대비 높게 나타났으나, 엘크 수사슴에 비해서는 낮은 수치를 보여주었다. 이러한 결과는 기성초지 이용으로 인해 사초의 생산성이 감소한 결과로 사료되며, 앞으로 방목초지의 혼파방법과 기성초지의 비배관리 등을 통해 초지 활용성을 높일 수 있는 연구가 추가적으로 필요할 것으로 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제20권9호
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• pp.1374-1388
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• 2007

Three experiments were conducted to investigate the hypothesis that cows grazing on pasture produce the highest proportion of c-9 t-11 CLA in milk fat and no further increase can be achieved through supplementation of diets rich in linoleic acid, such as full-fat extruded soybeans or soybean oil. In experiment 1, 18 lactating Holstein cows were used in a randomized complete block design with measurements made from wk 4 to 6 of the experiment. In experiment 2, three cannulated lactating Holstein cows were used in a $3{\times}3$ Latin square design. Each period was 4 wk with measurements made in the final wk of each period. Cows in both experiments were assigned at random to treatments: a, conventional total mixed ration (TMR); b, pasture (PS); or c, PS supplemented with 2.5 kg/cow per day of full-fat extruded soybeans (PES). In both experiments, feed intake, milk yield, milk composition, and fatty acid profile of milk and blood serum were measured, along with fatty acid composition of bacteria harvested from rumen digesta in experiment 2. In experiment 3, 10 cows which had continuously grazed a pasture for six weeks were assigned to two groups, with one group (n = 5) on pasture diet alone (PS) and the other group (n = 5) supplemented with 452 g of soy oil/cow per day for 7 d (OIL). In experiment 1, cows in PS treatment produced 350% more c-9, t-11 CLA compared with cows in TMR treatment (1.70 vs. 0.5% of fat), with no further increase for cows in PES treatment (1.50% of fat). Serum c-9, t-11 CLA increased by 233% in PS treatment compared with TMR treatment (0.21 vs. 0.09% of fat) with no further increase for cows in PES treatment (0.18% of fat). In experiment 2, cows in PS treatment produced 300% more c-9 t-11 CLA in their milk fat compared with cows in TMR treatment (1.77 vs. 0.59% of fat), but no further increase for cows in PES treatment (1.84% of fat) was observed. Serum c-9, t-11 CLA increased by 250% for cows in PS treatment compared with cows in TMR treatment (0.27 vs. 0.11% of fat), with no further increase for cows in PES treatment (0.31% of fat). The c-9, t-11 CLA content of ruminal bacteria for cows in PS treatment was 200% or more of TMR treatment, but no further increase in bacterial c-9, t-11 CLA for cows in PES treatment was observed. Supplementation of soy oil in experiment 3 also did not increase the c-9 t-11 CLA content of milk fat compared with cows fed a full pasture diet (1.60 vs. 1.54% of fat). Based on these findings, it was concluded that supplementing with feeds rich in linoleic acid, such as full-fat extruded soybeans or an equivalent amount of soy oil, to cows grazing perennial ryegrass pasture may not increase milk fat c-9 t-11 CLA contents.

• 한국초지조사료학회지
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• 제36권4호
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• pp.387-392
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• 2016

본 시험은 한우연구소 시험우사와 표고가 700 m 지역에 위치한 개량목초지 (오차드그라스, 티머시, 톨페스큐 우점)에서 2014년 5월~10월동안 수행되었는데, 방목 처리구별 방목지를 선정하고 3구역으로 나눈 후, 방목지 초지식생을 고려하여 윤환방목을 4회 (1회당 38.5일) 실시하였다. 국립축산과학원 한우연구소에서 암소 육성우 및 성우 27두(시험구별 9두)를 공시하여 2014년 5~10월동안 수행하였다. 방목대상지는 오차드그라스, 티머시, 톨페스큐가 우점한 해발표고 700 m의 개량목초지를 이용하였다. 시험구 배치는 대조구, 처리1구, 처리2구로 구분하였으며, 대조구가 우사관리구 (건초급여와 농후사료급여), 처리1구는 방목사육과 농후사료 급여구, 처리2구는 방목사육과 농후사료 급여와 미량광물질제 급여구로 처리하였다. 본 연구에 사용된 미량광물질제는 마그네슘, 셀레늄, 반추위보호콜린이 포함된 시제품제제 (30g/두/일)를 급여하였다. 사료급여기준은 2012 한국 사양표준 (한우)에 따라 성장단계별 표준 목표체중 도달 또는 체중별 영양소요구량 충족을 위해 영양조절 급여를 수행하였다. 처리구별 방목지를 선정하고 각 세부적으로 3구역으로 나눠 5~10월 중 윤환방목을 실시했다. 측정항목은 생초수량, 체중, 사료섭취량, 혈중 대사물질, 경제성 분석, 수태율을 실시하였다. 윤환방목지의 생초수량 및 건물수량은 처리1구와 처리2구의 생초 총 생산량은 30,473.9 kg/ha, 30744.3 kg/ha였으며 방목지간의 차이를 보이지 않았다(P>0.05). 한우 14개월령 목표체중 240 kg에 모든 처리구가 도달했으며 생후 15개월령 체중은 대조구, 처리1구, 처리2구가 각각 259.9, 257.7 및 262.1 kg였다. 일당증체량은 대조구, 처리1구, 처리2구가 각각 평균 0.52, 0.51, 0.54 kg으로 시험구간에 차이가 없었다. 혈중 대사물질 중 글루코스의 함량이 처리1구(방목사육)에서 높았다. 수태율은 대조구, 처리1구, 처리2구가 88.9%, 100%, 100%였다. 시험구 간에 경제성 분석을 실시한 결과 두당 비용절감이 대조구에 비해 시험1구와 시험2구가 각각 143,790, 125,970원으로 나타났다.

• 한국초지조사료학회지
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• 제14권1호
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• pp.7-12
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• 1994

This study was undertaken to evaluate the effect of legume reseeding on legume establishment, dry matter yield, quality and botanical composition of grasses in timothy(Ph1eum prarense L.) dominated pasture at alpine area. Establishment number and percentage of legume in timothy dominated pasture were increased with spring, red clover(Tr$olium pratense L.) and gramoxone $treatment Dry matter yield of pasture was increased with fall and grazing after overseeding, but, there waq no difference in legume species. Crude protein content(%) of grasses at the first cutting was increased with red clover and paraquat (gramoxone) treatment. Based on the results, it is suggested that spring in seeding time, red clover in legume species and oveneeding after gramoxone treatment are good for effective renovation of timothy dominated pasture at alpine area.

• Asian-Australasian Journal of Animal Sciences
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• 제15권5호
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• pp.745-750
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• 2002

The effects of recording interval (1, 2, 3, 4, 5, 10, 15, 20 and 30 min) on the estimation of some grazing behavior variables in beef cows and calves (<4 months old) were investigated in a daytime grazing (7 h) system utilizing a bahiagrass (Paspalum notatum Flugge) pasture (a 1.1 ha paddock and a 0.4 ha resting area). Recording intervals of 10-30 min tended to underestimate the time spent grazing and ruminating and overestimate the time spent resting by animals, whereas intervals of 1-5 min resulted in almost constant estimates. In all grazing activities, the errors of estimation became larger when the recording interval exceeded 5 min. The accuracy of estimation was higher for grazing time>rumination time>resting time. An increase in recording interval always decreased estimates of the distance walked by animals. It was concluded that recording intervals of 1-5 min provide reliable estimates of the time spent grazing, ruminating and resting. It was also concluded that positioning of animals at 1 min intervals may provide estimates of walking distance with acceptable bias toward underestimation.

• Asian-Australasian Journal of Animal Sciences
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• 제3권3호
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• pp.183-186
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• 1990

Monensin administered as a slow release capsule to Droughtmaster steers grazing mixed pastures containing Stylosanthes hamata or grass pastures fertilized with N, had no effect on growth rate over 111 day period. Monensin significantly increased the level of propionic acid (p<0.001) and decreased the level of butyric acid (p<0.01) in the rumen. The lack of response to monesin was partly attributed to the poor pasture conditions and growth rate of the steers during part of the experimental period. An implant of oestradiol improved growth rates during the period of poor forage quality and in the subsequent 56 days when pastures were of high quality following rain. Mean growth rates over the entire 157 days for control, monensin and monensin/oestradiol treatments were 0.37, 0.37 and 0.50 kg/d respectively. It was concluded that when pasture conditions are sufficient only for the maintenance of liveweight, production can be improved by an oestradiol implant but not by feeding an ionophore such as monensin.

• 한국초지조사료학회지
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• 제38권2호
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• pp.120-125
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• 2018

본 연구는 야초지에서 흑염소 방목사육 시 사초생산성, 사료가치, 적정 방목강도 규명 및 가축생산성 분석을 통하여 야초지의 이용성을 평가하고 흑염소 방목 사육에 대한 기초적인 자료를 제공하고자 실시하였다. 공시축은 평균체중 14kg 전후의 4개월 령 육성기 암컷 흑염소 10두로 방목실험을 실시하였다. 방목 시 보충사료는 체중의 1.5%로 추가 급여 하였으며, 물은 자유 급수 할 수 있도록 하였다. 야초지의 건물함량은 봄에서 가을로 갈수록 건물함량이 증가하는 보고와 비슷하게 6월과 9월에 각각 $24.9{\pm}0.56%$, $24.4{\pm}0.89%$로 유의하게 높았다(p<0.05). 조단백질 함량은 평균함량 11%~12%를 유지하여 처리구간 유의성은 보이지 않았다. 야초지의 사료가치는 일정수준으로 영양소 함량이 유지되었으나 계절별로 생산되는 야초의 종류가 다르기 때문에 차이가 존재하였다. 방목 시 사초생산성은 야초의 경우 대부분 C-4형 식물이기 때문에 기온이 높은 여름철인 6월부터 8월까지 생산성의 증가한 것으로 보이며 8월의 경우 유의하게 높았다(p<0.05). 8월 이후 생산성이 급격히 감소하여 봄철과 가을철에 급격하게 생산성이 저하되는 야초지의 특성을 보였다. 방목 초지의 월별 생산성과 흑염소의 채식량을 기준으로 분석을 통해 월별 방목 강도를 설정하였다. 계산된 방목 강도는 8월에 55두/ha 로 가장 높았으며, 사초생산성이 떨어지는 시기인 9월에 21두/ha로 가장 낮았다. 평균 방목강도는 37두/ha로 이를 기준으로 보충사료의 양을 조절하여 방목 흑염소에게 부족하거나 과잉된 영양소 공급의 균형을 맞출 필요가 있을 것으로 사료된다. 흑염소 생산성의 계절별 변화는 증체량이 80.2 g/d 이었다. 방목구에서 안정적인 증체의 결과는 방목 후 추가로 농후사료를 보충급여 함으로써 흑염소의 영양소 요구량을 충족시켰기 때문이며, 방목사육 시 사초생산성이 떨어지는 시기에 적절한 방목강도 조절과 필요 영양수준에 맞춘 보충사료를 급여 한다면 가축의 생산성을 더 높일 수 있을 것으로 판단되며 야초지의 효율적인 활용기술 및 흑염소 방목기술의 추가적인 연구를 통하여 유기축산 및 산지생태축산 실현에 기여할 수 있을 것으로 사료된다.