Effects of Environmental Relative Humidity at Intermittent Partial Heat Environment on Body Temperature, Acid-Base Balance and Performance of Broilers

ZHOU Ying; PENG Qianqian; ZHANG Minhong; FENG Jinghai; ZHEN Long; ZHANG Shaoshuai; HU Chunhong

doi:10.3969/j.issn.1006-267x.2015.12.011

2015 , Vol. 27 >Issue 12: 3726 - 3735

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.12.011

POULTRY NUTRITION

Effects of Environmental Relative Humidity at Intermittent Partial Heat Environment on Body Temperature, Acid-Base Balance and Performance of Broilers

ZHOU Ying ,
PENG Qianqian ,
ZHANG Minhong ,
FENG Jinghai ,
ZHEN Long ,
ZHANG Shaoshuai ,
HU Chunhong

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1. State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
2. College of Agriculture Hebei University of Engineering, Handan 056021, China

Received date: 2015-06-12

Online published: 2015-12-14

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Abstract

The study was conducted to investigate the effects of relative humidity(30%, 60% and 85%) on body temperature, acid-base balance and performance of Arbor Acres(AA) broilers at intermittent partial heat(26, 31℃) environments. A total of three hundred and sixty 22-day-old AA broilers were allotted into environment chambers, and randomly divided into 6 groups(groups Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ), each group(chamber) contained six cages with ten birds per cage(with five males and five females), and each cage as a replicate. The pre-test period lasted for 7 days and broilers were kept at 21℃ and 60% relative humidity. The trial lasted for 14 days. When broilers were 29-day-old, the temperature of groups Ⅰ, Ⅱ and Ⅲ were at 26℃, regulating the relative humidity to 30%, 60%, 85%, respectively; the temperature of Ⅳ, Ⅴ, Ⅵ group were at 31℃, while regulating the relative humidity to 30%, 60%, 85%, respectively. And the temperature and relative humidity of groups were kept six hours each day, at 10:00-16:00, after the period, broilers were kept at 21℃ and 60% relative humidity. The results showed as follows:1) average daily food intake(ADFI), average daily gain(ADG) in group Ⅱ were the highest among 6 groups. ADFI and ADG in group Ⅵ were the lowest. No significant difference of feed to gain ratio(F/G) was found among the groups(P>0.05). 2) On days 1, 3 and 10, core temperature and skin temperature in group Ⅵ were the highest among 6 groups, and skin temperature in group Ⅲ was higher than that in groups Ⅰ and Ⅱ(P<0.05). On day 1, core temperature in group Ⅱshowed significantly lower than that in groups Ⅰ and Ⅲ(P<0.05). On days 3 and 10, there was no significant difference among groups Ⅰ, Ⅱ and Ⅲ(P>0.05). 3) The pH and oxygen pressure(pO₂) in group Ⅱ were significantly lower than those in other groups(P<0.05), and no significant difference of carbon dioxide(pCO₂) was found among the groups(P>0.05). In conclusion, at the intermittent partial heat environment of 26, 31℃, compared with 60% relative humidity, 85% and 30% relative humidity can change the body temperature, acid-balance and performance of broilers. And relative humidity may affect broilers to varying degrees at different partial heat environments.

Key words： relative humidity; intermittent partial heat environment; body temperature; acid-base balance; performance; broilers

Cite this article

ZHOU Ying , PENG Qianqian , ZHANG Minhong , FENG Jinghai , ZHEN Long , ZHANG Shaoshuai , HU Chunhong . Effects of Environmental Relative Humidity at Intermittent Partial Heat Environment on Body Temperature, Acid-Base Balance and Performance of Broilers[J]. Chinese Journal of Animal Nutrition, 2015 , 27(12) : 3726 -3735 . DOI: 10.3969/j.issn.1006-267x.2015.12.011

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