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http://dx.doi.org/10.5536/KJPS.2007.34.2.091

Analysis of the Age-Dependent Change in the Blood Chemical Values from Hyline Brown Layer Chickens under Field Condition  

Son, Y.H. (Banseok Institute of Avian Clinic)
Cha, S.Y. (Department of Infectious Diseases and Avian Diseases, College of Veterinary Medicine, Chonbuk National University)
Park, J.B. (Department of Infectious Diseases and Avian Diseases, College of Veterinary Medicine, Chonbuk National University)
Park, Y.M. (Department of Infectious Diseases and Avian Diseases, College of Veterinary Medicine, Chonbuk National University)
Ryu, K.S. (Department of Animal Resources & Biotechnology, Chonbuk National University)
Jang, H.K. (Department of Infectious Diseases and Avian Diseases, College of Veterinary Medicine, Chonbuk National University)
Publication Information
Korean Journal of Poultry Science / v.34, no.2, 2007 , pp. 91-97 More about this Journal
Abstract
To evaluate the physiological status of laying flocks, the blood chemistry values were measured and analyzed in various ages under different feeding conditions. Total 671 birds from 48 Hyline brown hens flocks from 13 different poultry farms were bled at the ages of day(s) 1, 11, 21, 50, 80, 120, 180, 240, 300, 400, and 500. The 17 blood chemistries including glucose, lipids, proteins, enzymes, electrolytes and metabolic by-products were measured with an autoanalyzer. Blood glucose showed the highest at the hatching day not relate with the dietary carbohydrates and energy, but tended to decrease during the rest of growth stage in hens. Total blood protein, albumin and globulin increased depending on the ages even though dietary protein was decreased. Blood lipid was greatly changed at different growth stages. Cholesterol was the highest at hatching period and maintained consistently until the 120 days of age. It was increased in birds after 180 days of age. HDL was also highest in hatchery, but decreased greatly after 180 days of age. However, TG was the lowest at one day old, but was increased up to 10 times after 180 days of age compared to that of one day old. The enzyme activities were different. AST, ALT, and GGT showed comparatively contained consistently, whereas amylase was slowly decreased. Blood P, Na, K and Cl showed consistency, but Ca content was increased upto two times of the one day of age. The results from this study showed that the blood chemistry values were affected by the general metabolic status of the host with ages not by feeding conditions. Further, the standard data of age-dependent blood chemistry values in the laying flocks were obtained, which can be utilized for early detection of the changes in the physiological status occurred by the infectious or metabolic diseases. The results of these analyses seemed to be useful to increase the productivity of laying flocks through rapid and proper veterinary medical treatments.
Keywords
laying flocks; blood chemistry; age-dependent; productivity; medical treatment;
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