Requirement of 25-Hydroxycholecalciferol for Broilers

CHEN Guanhua, ZHANG Jinlong, WANG Jianguo, ZHANG Ning, QU Hongxia, WANG Zhixiang, YAN Yongfeng, HAN Jincheng

doi:10.3969/j.issn.1006-267x.2017.07.016

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 7: 2335 - 2347

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.07.016

Molecular Nutrition

Requirement of 25-Hydroxycholecalciferol for Broilers

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1. College of Life Science, Shangqiu Normal University, Shangqiu 476000, China;
2. College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, China

Received date: 2016-12-14

Online published: 2017-07-05

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Abstract

This experiment was conducted to investigate the dietary optimum requirement of 25-hydroxycholecalciferol (25-OH-D₃) for Ross 308 broilers aged from 1 to 21 days and 1 to 42 days. Five hundred one-day-old male Rose 308 broilers were randomly assigned to ten groups with five replicates per group and ten birds per replicate. Dietary 25-OH-D₃ levels were 50, 100, 200, 400, 600, 800, 1 600, 2 400, 3 200, and 4 000 IU/kg, respectively. The experiment lasted for 42 days. The results showed as follows: 1) the body weight (BW), average daily gain (ADG) and average daily feed intake (ADFI) of broilers aged from 1 to 21 days and 1 to 42 days were significantly increased but the ratio of feed to gain (F/G) and mortality significantly decreased when dietary 25-OH-D₃ level increased from 50 to 600 IU/kg (P<0.05). No significant differences in growth performance indexes were observed when dietary 25-OH-D₃ level increased from 600 to 4 000 IU/kg (P>0.05). 2) The bone (femur, tibia and metatarsus) strength, weight, length, ash weight and ash, calcium, and phosphorus contents of broilers aged at 21 and 42 days were significantly increased when dietary 25-OH-D₃ level increased from 50 to 600 IU/kg (P<0.05). No significant differences in bone parameters were found when dietary 25-OH-D₃ level increased from 600 to 4 000 IU/kg (P>0.05). 3) Plasma calcium content of broilers aged at 21 and 42 days was significantly increased when dietary 25-OH-D₃ level increased from 50 to 600 IU/kg (P<0.05). No significant difference in plasma calcium content was found when dietary 25-OH-D₃ level increased from 600 to 4 000 IU/kg (P>0.05). Dietary 25-OH-D₃ level had no significant effect on the plasma inorganic phosphorus content of broilers (P>0.05). 4) The depositions of calcium and total phosphorus of broiler aged from 11 to 14 days and 31 to 34 days were significantly increased when dietary 25-OH-D₃ level increased from 50 to 800 IU/kg (P<0.05). No significant differences in depositions of calcium and total phosphorus were found when dietary 25-OH-D₃ level increased from 800 to 4 000 IU/kg (P>0.05). In conclusion, dietary requirement of 25-OH-D₃ of broilers aged from 1 to 21 days is 476 IU/kg and dietary requirement of 25-OH-D₃ of broilers aged from 1 to 42 days is 448 IU/kg based on broken-line regression model analysis using the growth performance indexes and bone parameters as criteria.

Key words： 25-hydroxycholecalciferol; requirement; growth performance; bone parameters; broilers

Cite this article

CHEN Guanhua, ZHANG Jinlong, WANG Jianguo, ZHANG Ning, QU Hongxia, WANG Zhixiang, YAN Yongfeng, HAN Jincheng . Requirement of 25-Hydroxycholecalciferol for Broilers[J]. Chinese Journal of Animal Nutrition, 2017 , 29(7) : 2335 -2347 . DOI: 10.3969/j.issn.1006-267x.2017.07.016

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