Influence of Breeding Density and Space Allowance on Immune and Stress Indexes of Broilers

LU Yingjie; MIAO Zhiqiang; LI Jianhui; YANG Ying; YANG Yu

doi:10.3969/j.issn.1006-267x.2016.09.032

Chinese Journal of Animal Nutrition >

2016 , Vol. 28 >Issue 9: 2927 - 2935

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.09.032

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Influence of Breeding Density and Space Allowance on Immune and Stress Indexes of Broilers

LU Yingjie ,
MIAO Zhiqiang ,
LI Jianhui ,
YANG Ying ,
YANG Yu

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1. College of Animal Science and Technology, Shanxi Agricultural University, Taigu 030801, China;
2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2016-03-03

Online published: 2016-09-08

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Abstract

The influence of breeding density and space allowance on immune and stress indexes of broilers were investigated in this experiment. Using a 3×2 factors completely randomized design, a total of 756 one-day-old Arbor Acres (AA) broilers were randomly allotted into 6 groups with 6 replicates per group. Two kinds of space allowance were designed as 2.88 (2.4 m×1.2 m) and 1.44 m² (2.4 m×0.6 m), three breeding densities were designed as high density (14 birds/m²), medium density (10 birds/m²) and low density (6 birds/m²). The experiment lasted for 42 day. The results showed as follows: 1) at 21 days of age, breeding density and space allowance had a significant interaction on average daily gain (ADG) and average body weight (ABW) (P<0.05). The ADG and ABW of broilers in the medium density with large space allowance group were significantly higher than those in the medium density with small space allowance group and the high density with small space allowance group (P<0.05). Breeding density and space allowance had significant effects on serum free fatty acids (FFA) content (P<0.01), also had a significant interaction (P<0.01), the serum FFA content in medium density group was significantly lower than that of high and low density groups (P<0.05). Breeding density had significant effects on the contents of interleukin-1β (IL-1β) and interleukin-6 (IL-6) in serum (P<0.01 and P<0.05). Breeding density had significant effect on serum total antioxidant capacity (T-AOC) (P<0.05). Breeding density and space allowance had a significant interaction on serum glutathione peroxidase (GSH-Px) activity (P<0.05). 2) At 42 days of age, breeding density and space allowance had a significant interaction on ADG, feed to gain (F/G) and ABW (P<0.05). The ADG and ABW of broilers in medium and low density with large space allowance group and low density with small space allowance group were significantly higher than those in other groups (P<0.05), the average daily feed intake (ADFI), ADG and ABW of broilers in high density were significantly lower than those in medium and low density group (P<0.05), the ABW of broilers in large space allowance group was significantly higher than that in small space allowance group (P<0.05), the ADFI of broilers in large space allowance group was significantly lower than that in small space allowance group (P<0.05), the F/G of broilers in medium and high density with large space allowance group was significantly lower than that in medium and high density with small space allowance group (P<0.05). The serum glucose content in high density group was significantly higher than that in medium and low density group (P<0.05). The serum IL-1β content in medium density group was significantly lower than that in high and low density group (P<0.05). In summary, breeding density and space allowance have a certain influences on ADFI, ADG, F/G, ABW and contents of FFA, Il-1β and IL-6 in serum, and cause chicken's stress and immune response. This experiment can preliminary draw the conclusion that the medium density (10 birds/m²) with large space allowance (2.88 m²) has lowest immunological stress, which is more suitable for the growth of broilers.

Key words： broilers; breeding density; space allowance; immunological stress; antioxidant function

Cite this article

LU Yingjie , MIAO Zhiqiang , LI Jianhui , YANG Ying , YANG Yu . Influence of Breeding Density and Space Allowance on Immune and Stress Indexes of Broilers[J]. Chinese Journal of Animal Nutrition, 2016 , 28(9) : 2927 -2935 . DOI: 10.3969/j.issn.1006-267x.2016.09.032

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