• Title, Summary, Keyword: Laying Hen

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Research on Quantity and Characteristics of Excreta Produced by Laying Hen (산란계에 있어서 계분의 배설량과 이화학적 특성에 관한 연구)

  • 최희철;이덕수;강희설;곽정훈;최동윤;한정대;김형호
    • Journal of Animal Environmental Science
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    • v.7 no.1
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    • pp.39-44
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    • 2001
  • This research was carried out to determine the quantity and characteristics of layer excreta produced in different age and different types of layer house. Daily feed intakes in the growing stage were 60.8 and 92.9g/d the 6th and 12th week of age, respectively. Daily feed intakes in the early laying stage (19th wk of age) and the ending period of laying(55th wk of age) were 105.1 and 122.0 g/d, respectively. A laying hen consumed 193.1~222.5$m\ell$ of water per day. The amount of excreta produced by laying hen were 143.3~144.8g per day. The moisture contents of excreta produced by laying hen ranged over 74.7~80.5% in laying period. The average contents of N, $P_2O_5$ and $K_2O$ in layer excreta were 4.88, 1.92 and 1.71% in DM basis, respectively. In the laying period, CaO contents of excreta were 7.42~9.02%. The moisture contents of excreta produced by windowless poultry house, open-sided poultry house applied mechanical ventilation and open-sided poultry house applied natural ventilation were 65.4, 75.7 and 81.3% in summer, respectively.

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THE EFFECT OF DIETARY MAGNESIUM LEVEL ON THE MAGNESIUM METABOLIZABILITY IN LAYING TSAIYA DUCK AND LEG HORN HEN

  • Ding, S.T.;Shen, T.F.
    • Asian-Australasian Journal of Animal Sciences
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    • v.5 no.2
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    • pp.225-228
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    • 1992
  • The study was undertaken to determine the effect of various levels of dietary magnesium on the metabolizability of magnesium in laying Tsaiya ducks and Leghorn hens. Twenty-five Tsaiya ducks and 25 Leghorn hens were raised in individual cages. The basal diet was mainly consisted of corn starch and isolated soybean protein. At the beginning of the experiments, birds were fed the basal diet added with 500 mg/kg Mg (1070 mg/kg in total by analysis) for 10 days in order to make the birds adapt to the new diet. Then, they were randomly divided into five treatments with five birds for each treatment and fed the experimental diets containing 690, 1070, 1690, 2150 or 2380 mg/kg Mg for 21 days and during the last five days excreta were collected. The experiment was repeated three times each at the age of 25, 31 and 36 weeks. The metabolizability of magnesium in the diet was determined by the indicator method. The metabolizabilities of magnesium for Tsaiya duck and Leghorn hen were 59.9% and 62.5%, respectively as the diet contained 690 mg/kg magnesium, and were significantly decreased (p<0.05) to 39.7 and 30.7%, respectively when the dietary magnesium content was increased to 2380 mg/kg.

The effect of sound stress on laying hen performance (소음스트레스에 의한 산난계의 피해상황 연구)

  • 신창호;한귀섭;박현기;이용범
    • Korean Journal of Veterinary Service
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    • v.23 no.3
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    • pp.263-269
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    • 2000
  • This study was carried out to set a standard of damage compensation by researching state of damage due to noises in laying and prelaying hens. Recently, there are many damage cases in chicken farms near construction site that were caused by noises of construction. Therefore disputes and complaints about economical loss have increased ceaselessly. But we have few research and report such a thing. The result have shown that the weight loss rate was ranged from 9.48% to 23.2% and mortality of laying period of hens was higher than prelaying period. Pathological findings were fatty liver, congestion and hemorrhage of intestine, erosion of proventriculus and gizzard in order of case frequency. And these signs in hens of laying period was more serious than prelaying period. Half-life rate of antibody titers against Newcastle disease and infectious bronchitis in sound stressed hens was no different compared with non-stressed hens. Egg production rate dropped from 38% to 45% according to strength of noises. Before being stressed, hens produced special, large, middle, small-size eggs in the order. But after being stressed, their egg Production rate of middle, small-size Increased while egg production rate of special, large-size decreased. Production rate of soft and broken shell eggs was 0.015% in the stressed flocks higher than 0.005% in the non-stressed flocks.

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Ovarian adenocarcinoma in white leghorn and Ogol chicken (오골계와 백색산란계에서의 난소선암종)

  • Ha, Jeong-Im;Jee, Hyang;Lim, Jung-Mook;Han, Jae-Yong;Kim, Dae-Yong
    • Korean Journal of Veterinary Research
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    • v.48 no.4
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    • pp.469-472
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    • 2008
  • Necropsy was performed on a total of twenty three either white leghorn or ogol chickens which were more than 150 weeks of age. Among twenty three chickens examined, fifteen chickens were laying and the rest eight chickens were non-laying. On necropsy, neoplastic mass in the five chickens among non-laying chickens was found. These neoplastic masses were present mostly in the ovaries and one case in the liver and characterized by multifocal to coalescing 1 to 5 mm tan firm nodular formation. On histopathology, ovarian adenocarcinoma with widespread abdominal seeding and hepatic metastasis was diagnosed in the three chickens. Oviductal leiomyoma was also found in two chickens that had a focal well-demarcated nodules in the oviduct. Taken together, the number with ovarian adenocarcinoma among non-laying chickens over 150 week old was 37.5%. As most animal species do rarely develop ovarian tumors, the high rate of spontaneous ovarian adenocarcinoma in non-laying hen suggest that the hen is a proper model for human ovarian cancer study.

Effects of Vitamine and Mineral Supplements on the Performances of Broiler Breeder Hens (비타민과 미네랄 첨가가 육용종 암탉의 생산능력에 미치는 영향)

  • 윤병선;강보석;김상호;최철환;나재천;서옥석
    • Korean Journal of Poultry Science
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    • v.27 no.3
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    • pp.181-187
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    • 2000
  • This work was designed to investigate the performances of broiler breeder hens upon the addition were vitamin and mineral supplements in feeds. Animals were divided into for feed groups such as control, T$_1$,T$_2$and T$_3$, and each treatment has four replications. All broiler breeder hens were housed individually, and were fed with identical iso-metaboilic energy and iso-protein, except for vitamins and minerals. Different sources and levels of vitamins and minerals were added to the basic feeds according to the treatments. At the end of the experiments, general laying rate(hen days), average egg weight, hatching egg laying rate(Hen day) every day. Hatching egg weight, sterility, embryo mortality, hatching rate and chick weight were examined. Although, early laying rate in all treatment groups were reduced during cold term management, general egg laying rate was increased only T$_3$group which was contanining vitamin C. However, similar results were obtained in the rates of general and hatching egg laying. General egg laying rate were somewhat higher of Control, T$_2$and T$_3$ groups than that of T$_1$group. In addition, the laying rates of general and hatching eggs slightly improved in the T$_3$group rather than those of Control group. Egg weight was reduced with the increasing of laying rate, showing the highest in the T$_3$group. The laying rate showed significantly lower value than those of any other groups. Egg weight was about 65g in T$_3$group. The results of hatching performance for production ability of Broiler breeder hens were fed experimental diet, although the rates of non-hatched and hatched eggs increased in order of Control, T$_1$T$_2$and T$_3$groups. However, the rate of embryo mortality was declined in order Control, T$_1$T$_2$and T$_3$groups.

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Effects of Phytase Supplementation on Nutrient Balance and Production of Laying Hens (Phytase 첨가가 산란계의 체내 영양소 균형 및 생산성에 미치는 효과)

  • 홍종옥;김인호;김은주;권오석;이상환
    • Korean Journal of Poultry Science
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    • v.28 no.1
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    • pp.1-6
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    • 2001
  • Two experiments were carried out to evaluate the effects of adding phytase on nutrient availability and serum Ca and P level and to determine the effects of phytase on laying performance and egg quality in laying hens. In Exp. 1, twenty four laying hens(1.9kg average body weight and 78.4% egg production) were allotted to four treatments. Treatments included 1) corn-soybean meal based-control diet and 2), 3) and 4) control diet with phytase 200, 400 and 600 unit/kg, respectively. There were no significant effects of treatments on dry matter and nitrogen digestibility(P〉0.05). Ash, Ca and P digestibility in layer fed diet with phytase were greater than those in layer fed control diet(P〈0.05). Laying hens fed diets with phytase 200 and 400 unit retained more Ca than those fed other treatments (P〈0.05). No statistical difference was found for Ca exsretion(P〉0.05). P retention was greater for laying hens fed diet phytase 600 unit than other treaments(P〈0.05). P level in serum was higher for laying hens fed diets with phytase 400 and 600 unit than for laying hens fed other treatments. In Exp. 2, three hundred, IAS Brown layer, 40-week-old, divided into two treatment groups(control vs phytase supplementation without inorganic phosphate in the diets) with five replications per treatment and 30 layers per replication were fed the diets for 6 weeks. Egg production, egg weight and eggshell breaking strength and thickness were not different significantly(P〉0.05). In conclusion, phytase supplementation can be used to increase P utilization and retention in laying hens. Also, phytase supplementation was effective to spare inorganic phosphate in laying hen diets without any adverse effects on production performances.

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Characteristics of Vocalizations of Laying Hen Related with Space in Battery Cage (케이지 내 사육 공간의 차이에 따른 산란계의 음성 특성)

  • Son, Seung-Hun;Shin, Ji-Hye;Kim, Min-Jin;Kang, Jeong-Hoon;Rhim, Shin-Jae;Paik, In-Kee
    • Journal of Animal Science and Technology
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    • v.51 no.5
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    • pp.421-426
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    • 2009
  • This study was conducted to clarify the characteristics of vocalization of laying hen related with space in battery cage. The size of cages were classified into control (0.30 m ${\times}$ 0.14 m ${\times}$ 0.55 m, length ${\times}$ width ${\times}$ height), small (0.21 m ${\times}$ 0.14 m ${\times}$ 0.55 m) and large (0.30 m ${\times}$ 0.30 m ${\times}$ 0.55 m) size. Vocalization of 16 individuals of laying hen in each group of Hy-Line Brown (80 week old) were recorded 3 hours per day (10:00am~11:00am, 3:00pm~4:00pm and 7:00pm~8:00pm) using digital recorder and microphone during October 2008 and February 2009. Characteristics of frequency, intensity and duration of vocalization were analyzed by GLM (general linear model) and Duncan's multi-test. There were differences in basic and maximum frequency, and intensity based on analysis of spectrogram and spectrum among different cage sizes. Vocalization of laying hen would be one of the indicators to understand the stress caused by rearing space in batter cage.

Effects of Taurine Supplementation on the Egg Production and Quality in Laying Hen (타우린 첨가가 산란계의 난 생산성 및 난질에 미치는 영향)

  • 김정학;심관섭;박강희
    • Korean Journal of Poultry Science
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    • v.29 no.3
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    • pp.171-176
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    • 2002
  • Two experiments were conducted to investigate the effects of taurine supplementation on the egg production and egg quality in laying hen. In experiment 1, 19-wk-old laying hens were allowed one of four taurine supplemented diets (0 (control), 0.4, 0.8, and 1.2% taurine) for 10 weeks. The mean egg weight was lower about 1.2g in the 0.8% diet compared to the control. Egg production rate, egg mass, and feed intake in layers fed with 0.4, 0.8, and 1.2% taurine supplemented diets decreased by 8%∼24%, 3%∼l4% and 11%∼l5%, respectively, relative to the control. However, the feed conversion, parameters of egg quality, and the concentration of triacylglycerol and the level of cholesterol in yolk were not different among the treatments. In experiment 2, 81-wk-old laying hens were allocated one of three taurine supplemented diets(0 (control), 1 and 2% taurine) for 6 weeks. The egg weight, egg production rate, egg mass, feed intake, feed conversion, parameters of egg quality, and level of yolk cholesterol were not different among the treatments, but the concentration of triacylglycerol in yolk was higher by 14%∼19% compared to the control. In conclusion, these results indicated that taurine supplementation in early laying stage of layers decreased hen performance.

COMPARATIVE STUDIES ON THE UTILIZATION OF CALCIUM BETWEEN LAYING TSAIYA DUCK AND LEGHORN HEN

  • Chen, Woan-Lin;Shen, Tlan-Fuh
    • Asian-Australasian Journal of Animal Sciences
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    • v.2 no.2
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    • pp.67-75
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    • 1989
  • Studies were conducted to compare the utilization of dietary calcium between brown laying Tsaiya duck and Leghorn hen. Birds were fed corn-soybean diets containing 1.0, 2.0, 3.0, 4.0 and 5.0% calcium, respectively, with five birds per treatment. The metabolizability of calcium was determined by the indicator method. Experiments were conducted three times each at the age of 27, 31 and 36 weeks. Results appeared that duck eggs were heavier with better shell quality in comparison with hen eggs. Ducks fed 1% calcium diet resulted in severely depressed egg production (19%), but not for hens which still had 56% egg production. The metabolizability of calcium for hens was significantly higher than that for ducks (P<0.05) when both were fed diets containing 1 or 2% calcium. As the dietary calcium level was increased to 3 to 5%, there was no significant difference in calcium metabolizability between ducks and hens. When the dietary calcium was between 2 to 5%, the ducks retained more calcium than did the hens. Plasma calcium content for both hens and ducks fed 1% calcium diet was about the same. When the amount of the dietary calcium was increased to 2-5%, the plasma calcium level of ducks was approximately 7-10 mg/dl higher than that of hens. The calcium content in the egg shell of duck was significantly higher than that of hens, too. As the dietary calcium level was increased, there was a decreased magnesium content in the eggshell of hens, but not for ducks. The magnesium level in the eggshell was higher in hens than that in ducks. It is concluded that ducks could retain significantly more calcium and maintain higher plasma calcium level which might be the reason for larger eggs with better shell quality by ducks.

Determination of Energy and Nutrient Utilization of Enzyme-treated Rump Round Meat and Lotus Root Designed for Senior People with Young and Age d Hens as an Animal Model

  • Park, Okrim;Kim, Jong Woong;Lee, Hong-Jin;Kil, Dong Yong;Auh, Joong-Hyuck
    • Food Science of Animal Resources
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    • v.36 no.1
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    • pp.109-113
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    • 2016
  • This study aimed to examine the nutrient utilization of rump round meat and lotus root using young (32 wk) and aged hens (108 wk) as an animal model. Rump round meat and lotus root were prepared with or without enzymatic treatment. For each age group of laying hens, a total of 24 Hy-Line Brown laying hens were randomly allotted to one of two dietary treatments with six replicates. For rump round meat, the true total tract retention rate (TTTR) of dry matter (DM) and nitrogen (N) were unaffected by either enzymatic treatment or hen age. However, aged hens had greater (p<0.01) TTTR of energy and crude fat than young hens. Enzymatic treatment did not influence the TTTR of energy or crude fat. In addition, we did not observe any significant interaction between the TTTR of DM, energy, N, or crude fat in rump round meat and hen age or enzymatic treatment. The TTTR of DM remained unchanged between controls and enzyme-treated lotus root for young hens. However, enzyme-treated lotus root exhibited greater (p<0.05) TTTR of DM than control lotus root for aged hens, resulting in a significant interaction (p<0.05). The TTTR of energy and N in lotus roots were greater (p<0.01) for aged hens than for young hens. In conclusion, enzymatic treatment exerted beneficial effects on energy and nutrient utilization in aged hens, suggesting the aged hen model is practical for simulation of metabolism of elderly individuals.