• Korean Journal of Poultry Science
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• v.32 no.1
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• pp.67-72
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• 2005

Forty-wk-old 480 ISA Brown layers were used in a 10-wk feeding trial to investigate the effects of additional various levels of limestone to a low calcium diet without any calcium additives on the performance of laying hens. There were significant differences in average egg weight (P<0.05) without any specific trend among treatments and hen-day egg production was not influenced by the dietary treatments. Daily intake and conversion per kg egg of feed excluded the calcium supplement were significantly reduced (p<0.05) as the level of additional calcium supplement increased in both types of layer diet, while those of feed included the calcium source were significantly increased (P<0.05) as the level of additional calcium supplement increased. Egg specific gravity, eggshell breaking strength and thickness were increased as the level of additional calcium supplement increased, however the significant differences were found only in egg specific gravity It would be possible to reduce the daily feed intake and feed conversion and to improve the eggshell quality by feed the low calcium diet devoid of calcium supplement from the conventional laying hen diet and by supply the additional calcium source at 3 to 4 p.m. instead of the continuous feeding of conventional high calcium diet.

• KOREAN POULTRY JOURNAL
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• v.3 no.7 s.21
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• pp.58-63
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• 1971

국내에서 생산되는 배합사료의 품질을 비교하기 위하여 1969년부터 3년간 전국에서 323점의 배합사료 샘플을 수집하여 일반 조성분 및 칼슘인 함량을 분석해 본 결과 다음과 같은 결론을 얻었다. (1) 모든 성분에 있어서 같은 사료라도 제조하는 회사에 따라 그 함량의 변이가 심하며 산란사료의 경우에는 생산하는 종류의 계열화가 필요하다고 생각된다. (2) 수분 함량은 대개의 경우 13$\%$이하이나 일부 15$\%$ 이상으로 높은 것도 있었다. 조단백질 함량이 지나치게 높은것도 있었으나 다소 부족한 감이 있는 것도 상당수에 달했으며 대체로 조섬유 함량은 허용범위내에 들어갔으나 더러는 공정규격의 상한치를 넘는 것도 있었다. 산란계 사료에 있어서 조회분 함량과 Ca의 함량을 상관시켜 보면 공정규격 상한치의 제조정이 요청된다. (3) 초생추, 중추 및 대추 사료에 있어서는 Ca함량이 1.2$\%$이상인 것이 많았고 산란계 사료에 있어서는 2.75$\%$이하인 것이 상당수 있어서 앞으로 칼슘의 함량조절에 크게 주의를 해야 된 것 같다. 이런 점에서 보면 유통되는 패분의 선택에 신경을 써야 할것으로 본다.

• Korean Journal of Poultry Science
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• v.8 no.1
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• pp.37-45
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• 1981

급격히 증가하는 세계의 인구수는 가축의 사료자원을 질이 좋은 인간 식량으로 효율적으로 전환할 필요성을 절실케 하고 있다. 산란계는 유전적인 선택에 의해 최소량의 사료로써 높은 산란율을 유지할 수 있도록 개선되어 왔다. 배합사료의 생산에 사용될 수 있는 단미사료의 종류와 품질은 어느 특정한 영양소의 요구량에 의하여 좌우된다. 산란계의 영양요구량은 오랜동안 연구되어 왔으며, 미국의 국립연구위원회 (NRC)는 영양소 요구량을 정기적으로 검토, 요약하고 있다. 새로운 정보들은 출판되어 왔으며 본인은 여기서 제7차로 개정된 NRC 사양표준(1977)에 발표된 요구량에 관련해서 몇 가지 분야를 검토하고자 한다. (중략)

• KOREAN POULTRY JOURNAL
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• v.47 no.4
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• pp.110-113
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• 2015

반백년 가까운 세월 동안 고품질 배합사료를 제조하면서 사양가의 생산성과 수익성 향상을 위해 달려온 (주)우성사료(대표 지평은)는 최근 양계PM을 전격 기용, 산란계 신제품 시리즈'코디여왕'을 출시하는 등 양계사료 시장의 새 출발을 알렸다. 당사 양계사료의 새 얼굴인 김승희 양계PM은 양축가가 필요한 부분이 무엇인지 그동안 사료회사에서 쌓은 오랜 현장 경험을 통해 터득하면서 영업직원들의 양계PM 지침서인 '양계핸드북'과 농장관리 프로그램인 '우성 산란계 체크리스트(WLC)'를 개발해 보다 체계적으로 농장 관리를 실시한다는 당찬 포부를 전한다. (주)우성사료의 김승희 양계PM을 만나 당사의 계획과 사업 추진 방향에 대해 들어보았다.

• 사료
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• s.47
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• pp.26-31
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• 2010

• 사료
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• s.41
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• pp.22-27
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• 2009

• 사료
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• s.42
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• pp.30-33
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• 2010

• Korean Journal of Poultry Science
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• v.23 no.1
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• pp.27-37
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• 1996

This experiment was carried out to study the effects of feeding split diets for a.m. and p.m. on laying hen performance and feed cost with 480 ISA Brown layers for three periods during 32∼36, 52∼56 and 72∼76 wk of age, respectively. The control group(C) was fed a conventional single diet throughout the day and split diet groups (T$_1$, T$_2$, T$_3$, T$_4$ and T$\_$5/) were offered high energy-high protein-low Ca diets, and low energy-low protein-high Ca diets in a.m. and p.m., respectively. In split diet groups, feed intake, ME and CP consumption, and feed cost were significantly reduced(P<0.05) compared to the C, while the hen-day egg production was significantly improved. However, the average egg weight was not influenced by the feeding system. Due to the reduced daily feed, ME, and CP intakes, and the improved egg production, the conversions of feed, ME, CP, and feed cost required per kg egg mass were also significantly improved (P<0.05) in splits diet groups. Among split diet groups, the T$_2$ group fed the diet devoid of Ca supplement from the conventional laying hen diet in a.m., and the diet containing the Ca supplement 2 times the conventional diet in p.m., was superior in conversion of nutrients and feed cost per kg egg mass to the other split diet groups. It was concluded that daily feed and nutrients cousumption and daily feed cost could be reduced 5∼6％ while hen-day egg production could be improved about 4％, so that about 10％ of the feed and nutrients and feed cost per kg egg mass could be spared by introducing the split diet feeding for a.m. and p.m. based on T$_2$ treatment in laying hens.

• KOREAN POULTRY JOURNAL
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• v.16 no.8 s.178
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• pp.62-65
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• 1984

• Korean Journal of Poultry Science
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• v.29 no.3
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• pp.195-204
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• 2002

Two experiments were conducted to study the effects of nutrient level and feeding method of split diets for a.m. and p.m. on laying hen performance, feed cost and eggshell quality. In experiment 1, 384 ISA Brown layers of 30∼38wk of age were assigned to four treatments which comprise of three replicates each containing 32 birds. The control(C) was fed a conventional single diet throughout the day and split diet groups(T1, T2 and T3) were offered high energy/protein-low Ca diets, and low energy/protein-high Ca diets in a.m.(04:00∼15:00) and p.m.(15:00∼21:00), respectively. In the split diet groups, daily ME and CP consumption, and feed cost were significantly reduced(P<0.05) compared to the C, while the hen-day egg production, average egg weight and daily feed intake were not different among treatments. Due to the reduced daily ME and CP intakes and feed cost, the conversions of feed, ME, CP and feed cost required per day and per kg egg mass were also significantly improved(P<0.05) in the split diet groups. Eggshell qualities (egg specific gravity, egg breaking strength and eggshell thickness) were improved(P<0.05) by split diet feeding. As the Ca level of the p.m. diet increased. In Experiment 2, 384 ISA Brown layers of 50∼58 wk of age were used in three treatments and each treatment was represented by four replicates each containing 32 birds. The control(C) was fed a conventional single diet throughout the day and split diet group(T1) was offered high energy/protein-low Ca diets, and low energy/protein-high Ca diets in a.m.(04:00∼l5:00) and p.m.(15:00∼21:00), respectively. T2 group was fed the diet mixed (50:50) with the a.m. diets in mash and p.m. diet in pellet used T1 group. In T1 and T2 groups, daily feed intake and average egg weight were significantly reduced(P<0.05) compared to the C, while the hen-day egg production was not influenced by the feeding system. Daily ME and CP consumption, and feed cost were reduced(p.0.05), and the conversions of ME, CP and feed cost required per egg were also significantly improved(P<0.05) in T1 and T2, while the conversions of feed, ME, CP and feed cost required per kg egg mass were not different to the C. Eggshell qualities of T1 and T2 were improved(P<0.05) compared to the others. It was concluded the feed and nutrients consumption, feed cost per day or per kg egg mass could be reduced by introducing split diets for a.m. and p.m. and the feeding method of mixed diet of split diets were also convenient and effective for sparing feed cost and improvement of eggshell quality.