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Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age

Journal of Animal Science and Biotechnology 2022年第4期13卷 1163-1174页

作者： Shiping Bai Yunfeng Yang Xuelian Ma Xiudong Liao Runlian Wang Liyang Zhang Sufen Li Xugang Luo Lin Lu Mineral Nutrition Research Division State Key Laboratory of Animal NutritionInstitute of Animal ScienceChinese Academy of Agricultural SciencesBeijing 100193China Poultry Mineral Nutrition Laboratory College of Animal Science and TechnologyYangzhou UniversityYangzhou 225000China Institute of Animal Nutrition Sichuan Agricultural UniversityChengdu 611130SichuanChina Department of Animal Science Guangdong Ocean UniversityZhanjiang 524088China Department of Animal Science Hebei Normal University of Science and TechnologyQinhuangdao 066004China.

Background:The current calcium(Ca)recommendation for broilers is primarily based on studies conducted more than 30 years ago with birds of markedly different productive potentials from those which exist today.And the response indicators in these studies are mainly growth performance and bone ash percentage.Therefore,the present study was carried out to investigate the effect of dietary Ca level on growth performance,serum parameters,bone characteristics and Ca metabolism-related gene expressions,so as to estimate dietary Ca requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age.Methods:A total of 4201-day-old Arbor Acres male broilers were randomly assigned to 1 of 7 treatments with 6 replicates(10 birds per cage)and fed the corn-soybean meal diets containing 0.60%,0.70%,0.80%,0.90%,1.00%,1.10%or 1.20%Ca for 21 days.Each diet contained the constant non-phytate phosphorus content of about 0.39%.Results:The average daily gain decreased linearly(Pbone mineral density(BMD),middle toe BMD,tibia ash percentage,tibia breaking strength,and tibia ALP protein expression level were affected(Pbone parameters,respectively.Conclusions:The results from the present study indicate that the Ca requirements would be about 0.60%to obtain the best growth rate,and 1.00%to meet all of the Ca metabolisms and bone development of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age.

关键词： bone characteristic Broiler Calcium Gene expression Requirement

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