Molecular Nutrition

Effects of Relative Humidity at Intermittent Moderate Temperature on Growth Performance, Behavior and Jejunum Morphological Structure of Broilers

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  • State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received date: 2017-03-13

  Online published: 2017-09-28

Abstract

This experiment was conducted to investigate the effects of relative humidity (RH) on growth performance, behavior and jejunum morphological structure of broilers at intermittent moderate temperature of 31℃. A total of 180 Arbor Acres broilers of 22-day-old were randomly divided into three environment chambers, each 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% RH. The trial period lasted for 14 days. When broilers were 29-day-old, the temperature of groupsⅠ, Ⅱ and Ⅲ were kept constant at 31℃ each day at 10:00 to 16:00 (6 h), while regulating the RH to 30%, 60% and 85%, respectively; and the rest of time, broilers were kept at 21℃ and 60% RH. The results showed as follows:1) average daily food intake (ADFI), average daily gain (ADG) and average daily drinking water in group Ⅲ showed significantly lower than those in group Ⅱ (P<0.05) during 1 to 14 days of the trial. 2) At the first day, the seventh day and the fourteenth day of the trial period, the frequency of total resting behavior in group Ⅱ was significantly lower than that in groups Ⅰ and Ⅲ (P<0.05), and the frequency of eating and drinking in group Ⅱ was significantly higher than that in groups Ⅰ and Ⅲ (P<0.05). 3) At the first day and the seventh day of the trial period, the frequency of sitting rest in groups Ⅰ and Ⅲ was significantly lower than that in group Ⅱ (P<0.05). At the seventh day of the trial period, the frequency of stretching rest in group Ⅲ was significantly lower than that in group Ⅱ (P<0.05), and at the fourteenth day, the frequency of stretching rest in groups Ⅰ and Ⅲ was significantly lower than that in group Ⅱ (P<0.05). Moreover, at the first day, the seventh day and the fourteenth day, the frequency of prostration rest in groups Ⅰ and Ⅲ was significantly higher than that in group Ⅱ (P<0.05). 4) The ratio of villus height to crypt depth of jejunum in group Ⅲ was significantly lower than that in groups Ⅰ and Ⅱ (P<0.05). In conclusion, at the intermittent thermal of 31℃, different RH levels can produce different effects on growth performance, behavior and jejunum morphological structure of broilers. And the high humidity has a greater impact on ADG, ADFI and jejunum morphological structure than the low humidity as well as the appropriate humidity is 60%.

Cite this article

LI Xiumei, GAO Jie, FENG Jinghai, ZHOU Ying, ZHANG Minhong . Effects of Relative Humidity at Intermittent Moderate Temperature on Growth Performance, Behavior and Jejunum Morphological Structure of Broilers[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3506 -3513 . DOI: 10.3969/j.issn.1006-267x.2017.10.011

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