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 (P<0.001) as dietary Ca level increased. The serum and tibia alkaline phosphatase (ALP) activities, tibia bone mineral density (BMD), middle toe BMD, tibia ash percentage, tibia breaking strength, and tibia ALP protein expression level were affected (P<0.05) by dietary Ca level, and showed significant quadratic responses (P<0.02) to dietary Ca levels. The estimates of dietary Ca requirements were 0.80 to 1.00％based on the best fitted broken-line or quadratic models (P<0.03) of the above serum and bone 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.

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 Nutrition,Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China;Poultry Mineral Nutrition Laboratory, College of Animal Science and Technology,Yangzhou University,Yangzhou 225000,China;Institute of Animal Nutrition,Sichuan Agricultural University,Chengdu 611130,Sichuan,China;Department of Animal Science, Guangdong Ocean University,Zhanjiang 524088,China;Department of Animal Science,Hebei Normal University of Science and Technology, Qinhuangdao 066004,China

畜牧与生物技术杂志（英文版）

[1]Shiping Bai;Yunfeng Yang;Xuelian Ma;Xiudong Liao;Runlian Wang;Liyang Zhang;Sufen Li;Xugang Luo;Lin Lu-.Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age)[J].畜牧与生物技术杂志（英文版）,2022(04):1163-1174

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