• Title, Summary, Keyword: Laying Hen

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Effects of Dietary Supplementation of Copper-soy Proteinate on the Performance of Laying Hens (Copper-soy Proteinate의 첨가가 채란계의 생산성에 미치는 영향)

  • Lee, Mun-Ku;Kim, Chan-Ho;Shin, Dong-Hun;Jung, Byoung-Yun;Paik, In-Kee
    • Korean Journal of Poultry Science
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    • v.38 no.3
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    • pp.165-171
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    • 2011
  • This study was conducted to investigate the effects of dietary supplementation of copper-soy proteinate (Cu-SP) on the performance of laying hens. A total of 1,000 Hy-Line Brown laying hens of 32 wks old were assigned to one of the following 5 dietary treatments: Control, Cu-SP 50, 100, 150, 200 (50, 100, 150, 200 ppm Cu supplementation as Cu-soy proteinate). Each treatment was replicated 4 times with fifty birds per replication, housed in 2 birds cages. Fifty birds units were arranged according to randomized block design. Feeding trial lasted 5 wks under 16L : 8D lighting regimen. There were no significant differences among treatments in hen-day and hen-house egg production, egg weight, broken & soft egg production. Feed intake and feed conversion rate (FCR) were significantly (P<0.01) lower in Cu-SP treated groups than Control. Eggshell thickness was significantly (P<0.01) higher in Control than Cu-SP 100, 150 and 200. Egg yolk color index was significantly (P<0.01) higher in Cu-SP 200 than other treatments. Egg shell color index was significantly (P<0.05) higher in Cu-SP 150 and Cu-SP 200 than Cu-SP 100. Concentration of copper, iron and zinc of the egg yolk were not significantly influenced by treatment. There were no significant differences in the level of leukocytes and erythrocytes in the chicken blood. The result of this experiment showed that dietary supplementation of Cu-SP at the level of 50ppm of Cu can reduce feed intake and FCR.

Effect of increasing levels of apparent metabolizable energy on laying hens in barn system

  • Kang, Hwan Ku;Park, Seong Bok;Jeon, Jin Joo;Kim, Hyun Soo;Park, Ki Tae;Kim, Sang Ho;Hong, Eui Chul;Kim, Chan Ho
    • Asian-Australasian Journal of Animal Sciences
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    • v.31 no.11
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    • pp.1766-1772
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    • 2018
  • Objective: This experiment was to investigate the effect of increasing levels of apparent metabolizable energy ($AME_n$) on the laying performance, egg quality, blood parameters, blood biochemistry, intestinal morphology, and apparent total tract digestibility (ATTD) of energy and nutrients in diets fed to laying hens. Methods: A total of three-hundred twenty 33-week-old Hy-Line Brown laying hens (Gallus domesticus) were evenly assigned to four experimental diets of 2,750, 2,850, 2,950, and 3,050 kcal $AME_n/kg$ in pens with floors covered with deep litter of rice hulls. There were four replicates of each treatment, each consisting of 20 birds in a pen. Results: $AME_n$ intake was increased (linear, p<0.05) with inclusion level of $AME_n$ in diets increased. Feed intake and feed conversion ratio were improved (linear, p<0.01), but hen-day egg production tended to be increased with an increasing level of $AME_n$ in diets. During the experiment, leukocyte concentration and blood biochemistry (total cholesterol, triglyceride, glucose, total protein, calcium, asparate aminotransferase, and alanine transferase were not influenced by increasing level of $AME_n$ in diets. Gross energy and ether extract were increased (linear, p<0.01) as the inclusion level of $AME_n$ in diets increased. Conclusion: Laying hens fed high $AME_n$ diet (i.e., 3,050 kcal/kg in the current experiment) tended to overconsume energy with a positive effect on feed intake, feed conversion ratio, nutrient digestibility, and intestinal morphology but not on egg production and egg mass.

The Effects of Dietary Supplementation of L-carnitine and Humic Substances on Performance, Egg Traits and Blood Parameters in Laying Hens

  • Yalcin, Sakine;Ergun, Ahmet;Ozsoy, Bulent;Yalcin, Suzan;Erol, Handan;Onbasilar, Ilyas
    • Asian-Australasian Journal of Animal Sciences
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    • v.19 no.10
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    • pp.1478-1483
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    • 2006
  • This experiment was carried out to determine the effects of supplementation of L-carnitine and humic substances alone or in combination in laying hen diets on performance, egg traits and blood parameters. A total of 180 IGH type brown laying hens aged 22 weeks were employed in a completely randomized block design with one control group and three treatment groups. Each group was divided into five replicates as subgroups, each comprising 9 hens. The diets of the first, second and third treatment groups were supplemented with 0.1 g/kg L-carnitine, 1.5 g/kg humic substances (Farmagulator$^{(R)}$ Dry Plus) and 0.1 g/kg L-carnitine+1.5 g/kg humic substances, respectively. The experimental period lasted 18 weeks. Feeding supplemental carnitine, humic substances or carnitine+humic substances resulted in increases in body weight gain (p<0.05). Dietary treatments did not significantly affect daily feed intake, daily metabolizable energy intake, egg production, egg weight, feed efficiency, mortality, egg shape index, egg breaking strength, egg shell thickness, egg albumen index, egg yolk index, egg Haugh unit and the percentages of egg shell, albumen and yolk. Supplementation of humic substances reduced egg yolk cholesterol as mg per g yolk and mg per yolk (p<0.05). Blood serum parameters were not affected by the supplementation of carnitine, humic substances or carnitine+humic substances. The results in this study demonstrated that humic substances supplementation reduced egg cholesterol without adverse effects on performance, egg traits and blood parameters of laying hens. It was concluded that the usage of L-carnitine alone or in combination with humic substances in diets had no beneficial effects in laying hens.

Studies on Decision of Suitable Housing Density in Caged Laying Hens (케이지 산란계의 적정 사육밀도 구명에 관한 연구)

  • 김종문;이덕수;정선부;오세정
    • Korean Journal of Poultry Science
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    • v.17 no.4
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    • pp.318-326
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    • 1990
  • This experiment was conducted to determine the economic housing density levels on caged laying hens The experiment was carried out with 600 ISA Babcock strain of white coder and 450 ISA Brown strain of brown color for production period(21-72 weeks) from May 11. 1987 to June 27. 1988. The levels of housing density was employed 5 or 6 by hen's color from 272 to 920$\textrm{cm}^2$/per hen. The results obtained were summarzed as follows : 1. Although there were not statistically significant among the housing density levels, The body weight gain for pullet period(14-20 weeks) were in case of white pullet the lowest at the group of high crowding density (272$\textrm{cm}^2$/per pullet) and in case of Brown pullet was the lowest at the group of high crowding density(306$\textrm{cm}^2$/per pullet). 2. Viabillity of pullet from 14 to 20 weeks were more 97% and there urere not statistically significant among the housing density. 3. Viabillity of laying hens was increased as increasing housing density through the etire product period(21-72 weeks) but 453$\textrm{cm}^2$/per hen group(in case of brown hen) showed a significant difference (P<.05). 4. Rate of egg production through the etire production period(21-72 weeks) were significantly increased by increasing housing density (P<.05 or .01). 5. Average egg weight through the entire production period(21-72 weeks) was not significantly different among housing density levels at all laying kent 6. In case of white strain, egg mass per hen among treatment during the age of 63-72 weeks were decreased by increasing housing density, meanwhile, in case of brown strain were increased by decreasing housing density during the whole period and there were significant different among the all treatment 7. There were no significant different in feed intake among the all treatment through the entire production period(21-72 weeks) at the white strain laying hens but in case of brown strains, Feed intake were increased by increasing housing density and feeding spece/per hen, and there were significant different among the all treatment 8. Feed requirements per egg at white strain was the highest when the 272$\textrm{cm}^2$/per hen levels and at the brown strains was the highest when the 306$\textrm{cm}^2$/per hen levels, however, among the other treatment were no significant.

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Effects of Pelleting Layer Diets on Laying Hen Performance (산란계에 대한 펠렛사료의 급여효과)

  • 이규호
    • Korean Journal of Poultry Science
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    • v.24 no.1
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    • pp.39-44
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    • 1997
  • Two experiments were carried out to determine the effects of pelleting layer diets on the laying perforrnance and nutrients utilizability, using either 50-wk-old(Experiment 1) or 80-wk-old (Experiment 2) layers. There was no effect of pelleting layer diets on hen-day egg production and average egg weight but decreased (P<0.05) feed conversion ratio(intake /egg weight) in both experiments. Although both egg specific gravity and eggshell thickness were not influenced by pelleting eggshell breaking strength was improved(P<0.05) only in Experiment 1. Utilizability of dietary fat was improved(P<0.05) by pelleting layer diets with no difference in other nutrients utilizability. There was no difference in the passage rate of mash and pelleted layer diets.

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Studies on the Estimation of Productivity Improvement of Layer on the Basis of Random Sample Test (경제능력 검정성적을 기초로 한 산란계의 생산성 향상도 추정 연구)

  • 송상정;정선부;박응우;오세정
    • Korean Journal of Poultry Science
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    • v.16 no.4
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    • pp.239-252
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    • 1989
  • The present study was carried out to investigate the improvement of major production traits with the published data of twenty-two years'random sample tests held in Korea from 1966 to 1988. Eight traits-roaring viability, laying viability, age of sexual maturity, hen day egg production, hen-housed egg production, egg weight, feed requirement, 500 days body weight-were dealt with in this study. The results obtained in this study are summerized as follows; 1. Total mean value for rearing viability was 99.4% in 1980s. Mean value for rearing viability of colored hen was 99.5% and white hen was 99.06% in 1980s. Mean value for laying viability was increased by 0.98%, 0.86% and 0.86% per year in pool data, white hen and colored hen, respectively. 2, Age of sexual maturity was decreased from 171.1 day to 160.8 day in pool data during 1960s- 1910s but increased to 162.4 day in 1980s; and decreased from 160.5 day to 1595 nay in white hen but increased from 163.7 day to 166.1 day in colored hen during 1970s-1980s. 3. Mean values for hen-day egg production were increased by 0.96%, 1.09% and 0.63% per year in pool data, colored hen and white hen, respectively. 4. Mean values for hen housed egg production were increased by 45, 5.37 and 4.23 per year in pool data, colored hen and white hen, respectively. 5. Egg weight were improved by 0.22g and 0.25g per year in pool data and colored hen but decreased by 0.03g in white hen. 6. feed requirement were improved by 0.04, 0.05 and 0.1 per year in pool data, white hen and colored hen, respectively. 7. 500 days body weights were increased by 0.38g per year in pool data but decreased by 14.95g and 10.37g in colored hen and white hen, respectively. 8. Estimate of correlation coefficient between age of sexual maturity and other factors such as hen day egg production. hen housed egg production, egg weight and 500 days body weight were -0.4512, -0.2876, -0.4376 and 0.2045 in pool data; -0.358, -0.1530 0.3475 and 0.1208 in white hen; 0.0989, 0.1181, 0.2885 and 0.2248 in colored hen, respectively. Estimates of correlation coefficient between hen day egg production and egg weight were 0.6233, -0.2259 and 0.2973 in Pool data, white hen and colored hen; between hen day egg production and 500 days body weight, 0.2417, 0.0774, -0.4787 : between hen-housed egg production and egg weight, 0.6171, -0.2706, 0.4579: between hen housed egg production and 500 days body weight, 0.3082, -0.0792, -0.3368: between egg weight and 500 days body weight, 0.2742, 0.2205, 0.1354, respectively.

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Effects of Feeding Aspergillus oryzae Inoculant Food-waste Diets on Performance and Egg Quality in Laying Hens (Aspergillus oryzae 접종 잔반사료가 산란계의 생산성과 계란의 품질에 미치는 영향)

  • Hwangbo J.;Hong E. C.;Lee B. S.;Bae H. D.;Kim W.;Nho W. G.;Kim J. H.;Kim I. H.
    • Korean Journal of Poultry Science
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    • v.32 no.4
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    • pp.275-279
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    • 2005
  • This study investigated the effect of dried food-waste diets (FW) fermented by Aspergillus oryzae (AEW), on egg Production and egg qualify in laying hens. One hundred sixty eight laying hens, 50 week old, ISA-Brown wtrain were randomly distributed into 7 treatments with 3 relpicates of 8 birds per replicate and fed with standards laying hen diet replaced with FW and AFW at die=rent level Basal Diet, 25, 10, $75\%$, respectively. There was a significant decrease in feed intake for FW $50\%$ diet and egg Production was statistically lower in all W diet treatments(p<0.05). Water consumption was increased as the replacement increased. Egg weight, egg shell thickness and strength were similar among treatments. However, egg yolk color and Haugh unit showed distinct differences when W were added to their diets(p<0.05). No difference was observed in egg yolk cholesterol. It seems that FW diet could decrease the egg Production, but would be able to improve egg Quality. From this results, AO seemed applicable to laying hen diet as supplements.

Effect of Environmental Temperatures on Energy Metabolism of Laying Hen (환경온도가 산란계의 에너지대사에 미치는 영향)

  • 이영철
    • Korean Journal of Poultry Science
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    • v.14 no.2
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    • pp.97-102
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    • 1987
  • The respiratory experiment was made on laying hen fed acclimented to three temperatures of 10, 20, and 30$^{\circ}C$. 1. The FHP of laying hen decreased with increasing room temperature. 2. The feed intake and heat production(HP) all decreased with increasing temperature. However, the highest energy retention was found with optimum temperature (20$^{\circ}C$). 3, The MEm's were 128,110, and 110kcalkg 0.75 for the 10, 20, and 30$^{\circ}C$ of room temperature. The NAME's were 64,78, and 69 percent for the respective room temperature. The results indicated that the highest NAME was obtained with optimum temperature(20$^{\circ}C$). 4. Although there was no significant difference in the nitrogen retention(NR) at different temperatures, the NR was maximum at the optimum temperature(20$^{\circ}C$). 5. The experimental results suggest that in the Bone of thermal neutrality under cooler and hotter conditions heat loss is more dependent on the environmental temperature.

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Effect of Different Housing System on the Performance, Bone Mineral Density and Yolk Fatty Acid Composition in Laying Hen

  • Hassan, Md. Rakibul;Sultana, Shabiha;Choe, Ho Sung;Ryu, Kyeong Seon
    • Korean Journal of Poultry Science
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    • v.39 no.4
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    • pp.261-267
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    • 2012
  • Different housing systems have considerable influence on performance in poultry production. Therefore, the present study was undertaken to investigate the impact of different housing systems on the performance, bone mineral density and egg yolk fatty acid composition in laying hen. Hy-line brown pullets (n=450) of 12 weeks age were randomly divided into 3 housing systems with 6 replicates of 25 birds in each room. A diet with 2,750 kcal/kg ME and 16.5% CP was assigned to all birds. The pullets provided free access to feed and water. Significantly (P<0.05) higher values for egg production, egg mass and feed conversion efficiency were found in battery cages, however egg weight, egg shell color and breaking strength was remarkably (P<0.05) higher in floor system. The albumin height and Haugh unit were significantly higher (P<0.05) in battery cages which was statistically similar to aviary housing system. The egg yolk fatty acids concentration of linoleic acid and linolenic acids were significantly higher in aviary and in floor system, respectively, however both values were lower in battery cages. Saturated and unsaturated fatty acid content (%) in egg yolk did not influence by any housing systems. Bone mineral density was significantly higher (P<0.05) in floor and aviary housing system than that of battery cage system. It was concluded that in battery cages the egg production and composition maximized, however higher bone mineral density and yolk fatty acids content can be improved in the laying hen reared on floor and aviary housing systems.

Study on the Utilization of Drinking Water Supply System of Air-water Heat Pumps Applicable to Laying Hen (산란계에 적용 가능한 공기-물 히트펌프의 음용수 공급시스템 이용기술에 관한 연구)

  • Paek, Yee;Kang, Suk-Won;Jang, Jae-Kyung;Kwon, Jin-Kyung
    • Journal of the Korean Society of Mechanical Technology
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    • v.20 no.6
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    • pp.917-923
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    • 2018
  • The drinking water supply system applicable to the laying hen consists of air-water heat pumps, drinking water tanks, heat stroage tank, circulation pumps, PE pipes, nipples, and control panels. When the heat pump system has power of 7.7 to 8.7 kW per hour, the performance coefficient is between 3.1 and 3.5. The supply temperature from the heat pump to the heat stroage tank was stabilized at about $12{\pm}1^{\circ}C$, but the return temperature showed a variation of from 8 to $14^{\circ}C$. Stratified temperature in the storage tank appeared at $12.^{\circ}C$, $13.5^{\circ}C$ and $14.4^{\circ}C$, respectively. The drinking water supply temperature remained set at $15^{\circ}C$ and $25^{\circ}C$, and the conventional tap water showed a variation for $23^{\circ}C$ to $30^{\circ}C$. As chickens grow older, the amount of food intake and drinking water increased. $y=-0.0563x^2+4.7383x+8.743$, $R^2=0.98$ and the feed intake showed $y=-0.1013x^2+8.5611x$. In the future, further studies will need to figure out the cooling effect on heat stress of livestock.