Effects of Vitamin A on Growth Performance, Calcium and Phosphorus Metabolism and Immune Function of Ross 308&times;Hyline Brown Hybrid Broilers

DONG Yilei, JING Qingchuan, LIU Xuelan, FU Chunyan, ZHANG Yan, WEI Xiangfa, YAN Peipei, SHI Tianhong

doi:10.3969/j.issn.1006-267x.2019.02.019

2019 , Vol. 31 >Issue 2: 629 - 637

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.02.019

Molecular Nutrition

Effects of Vitamin A on Growth Performance, Calcium and Phosphorus Metabolism and Immune Function of Ross 308×Hyline Brown Hybrid Broilers

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Institute of Poultry Science, Shandong Academy of Agricultural Sciences, Ji'nan 250023, China

Received date: 2018-07-26

Online published: 2019-02-18

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Abstract

This experiment was conducted to study the effects of vitamin A on growth performance, calcium and phosphorus metabolism and immune function of hybrid broilers and to determine appropriate vitamin A level in diet. Seven hundred and twenty 1-day-old Ross 308×Hyline brown hybrid broilers were randomly allocated to six groups with 6 replicates per group and 20 chickens per replicate. One of six basal diets with different supplemental vitamin A levels as 1 000, 2 000, 6 000, 10 000, 14 000 and 18 000 IU/kg were randomly fed to the broilers for 42 days. The results indicated as follows:1) at 21 days of age, the body weight (BW) of broilers in 18 000 IU/kg vitamin A supplemental group was significantly higher than that of broilers in 1 000, 2 000 and 6 000 IU/kg vitamin A supplemental groups (P<0.05), but had no significant differences with that of broilers in 10 000 or 14 000 IU/kg vitamin A supplemental group (P>0.05). The BW of broilers at 14 and 21 days of age and feed consumption (FC) of broilers from 1 to 21 days of age had significant positive correlation with vitamin A supplemental level (P<0.05). The FC and feed to gain ratio of broilers from 22 to 42 days of age, BW at 42 days of age and survival rate of broilers from 1 to 42 days of age had no significant differences among all groups (P>0.05). 2) The indices of liver, spleen and bursa of Fabricius of broilers at 21 and 42 days of age had no significant differences among all groups (P>0.05). The serum Newcastle disease antibody (ND-Ab) titer of broilers in 6 000 IU/kg vitamin A supplemental group was significantly higher than that of broilers in 1 000 and 2 000 IU/kg vitamin A supplemental groups (P<0.05). A significant quadratic regression relationship between serum ND-Ab titer and the vitamin A supplemental level was detected when broilers were at 21 and 42 days of age (P<0.05), and the serum ND-Ab titer reached summit when vitamin A supplemental level was 12 000 IU/kg. The serum avian influenza virus H9 antibody (H9-Ab) titer of broilers had an increasing trend with the vitamin A supplemental level increasing (0.05 ≤ P<0.10), while the serum bursa virus antibody titer had no significant changes (P>0.05). 3) The serum contents of calcium and phosphorus, serum alkaline phosphatase activity and tibia ash content had no significant differences among all groups when broilers were at 21 and 42 days of age (P>0.05). In conclusion, enhancement of dietary vitamin A level can improve the serum titers of ND-Ab and H9-Ab and the growth performance of hybrid broilers at 21 days of age, but has no significant effects on the bone metabolism and the growth performance of hybrid broilers at 42 days of age. Considering all the indicators, it is considered that 6 000 and 1 000 IU/kg vitamin A respectively added to the corn-soybean meal basal diet for hybrid broilers of 1 to 21 days of age and 22 to 42 days of age can meet the needs of the broilers for good growth performance, good immune status and good bone development.

Key words： vitamin A; hybrid broiler; grwoth performance; serum antibody; immune organ index; tibia ash

Cite this article

DONG Yilei, JING Qingchuan, LIU Xuelan, FU Chunyan, ZHANG Yan, WEI Xiangfa, YAN Peipei, SHI Tianhong . Effects of Vitamin A on Growth Performance, Calcium and Phosphorus Metabolism and Immune Function of Ross 308×Hyline Brown Hybrid Broilers[J]. Chinese Journal of Animal Nutrition, 2019 , 31(2) : 629 -637 . DOI: 10.3969/j.issn.1006-267x.2019.02.019

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