Effects of Different Relative Humidity on Physiological Indices of Broilers under Continuous Increasing Temperature

LI Meng, LI Xiumei, ZHOU Ying, FENG Jinghai, ZHAO Qian, ZHANG Minhong

doi:10.3969/j.issn.1006-267x.2017.10.012

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 10: 3514 - 3522

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.10.012

Molecular Nutrition

Effects of Different Relative Humidity on Physiological Indices of Broilers under Continuous Increasing Temperature

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1. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China;
2. State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received date: 2017-03-10

Online published: 2017-09-28

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Abstract

In this study, the effects of different relative humidity (RH) on the physiological indices of broilers under increasing temperature environment were studied. One hundred and eighty 22-day-old Arbor Acres (AA) male broilers were allotted into environment controlled chambers and randomly divided into 3 groups with 6 replicates per group and 10 chickens per replicate. Adaptation period lasted for 7 days, and the temperature was 20℃ while the RH was 60%. When the broilers were 29-day-old, RH was adjusted to 35%, 60% and 85% of three groups, respectively, until the end of this trial. The temperature in the environment controlled chambers was rises by 2℃ per day, and the trial period was 9 days. When the broilers were 37-day-old, the temperature in the environment controlled chambers was 38℃. During the experiment period, the broilers fed and drank water ad libitum, and non-contact physiological indicators were measured, while there was no stress to chickens. The results showed that there was inflection point temperature (IPt) in core temperature (CT), earlobe temperature (ET), leg temperature (LT), respiratory rate (RR), feed intake (FI) and drinking water (DW). The first indicator of reaction was LT, and the temperature was in the range from 24.6 to 25.1℃, followed by ET and CT, while the temperature was in the range from 25.0℃ to 25.1℃ and 25.5 to 26.4℃ each. RR had two IPts (IPt₁ and IPt₂) which were in the range from 25.5 to 27.2℃ and 32.5 to 33.3℃. RR was increased with the increasing temperature above IPt₁, while decreased with increasing temperature above IPt₂. FI and DW were changed in the range from 27.1 to 29.3℃ and from 29.2 to 29.5℃ respectively, FI and DW were decreased with increasing temperature above IPt. The IPt of FI in high humidity group was significantly higher than those in middle and low humidity group (P<0.05). The IPt₂ of mortality rate (MR) in high humidity group was significantly lower than those in middle and low humidity group (P<0.05). The IPts of CT, ET, LT, RR, FI and DW under high humidity were lower than those in middle and low humidity group. RH had no significant effect on ET, LT, RR and DW model parameters (P>0.05). In conclusion, ambient temperature strongly affects the physiological indices of broilers, whereas RH has a relatively minor effects on it. The upper critical temperature can be considered to be the IPt above which FI decreased and RT then increased. The upper critical temperatures of 4 to 5 weeks old broilers are from 25.5 to 26.4℃for CT, from 25.5 to 27.2℃ for RR decreased, from 27.1 to 29.2℃ for FI increased, and from 32.7 to 33.5℃ for death. When the broiler died, the differences between the highest value of CT and the constant values are in the range from 4.6 to 5.1℃. The 4 to 5 weeks old male broilers have different upper critical temperatures for different physiological indices.

Key words： broiler; humidity; increasing temperatures; inflection point temperature

Cite this article

LI Meng, LI Xiumei, ZHOU Ying, FENG Jinghai, ZHAO Qian, ZHANG Minhong . Effects of Different Relative Humidity on Physiological Indices of Broilers under Continuous Increasing Temperature[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3514 -3522 . DOI: 10.3969/j.issn.1006-267x.2017.10.012

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