Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age
文献类型: 外文期刊
作者: Bai, Shiping;Yang, Yunfeng;Ma, Xuelian;Liao, Xiudong;Wang, Runlian;Zhang, Liyang;Li, Sufen;Luo, Xugang;Lu, Lin
作者机构:
关键词: Bone characteristic;Broiler;Calcium;Gene expression;Requirement
期刊名称: JOURNAL OF ANIMAL SCIENCE AND BIOTECHNOLOGY
ISSN: 1674-9782
年卷期: 2022 年 13 卷 1 期
页码:
收录情况: SCIE(2022版) ; CSCD(2021-2022年度) ; 科技核心(2021版) ; 农林核心(2020版)
摘要: 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 420 1-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.
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