Effects of High Temperature and Dietary Crude Protein Level on Performance, Nitrogen Metabolism and Emission in Broilers

CHEN Yan; FENG Jinghai; ZHANG Minhong; LIU Quanwei; JIANG Liwen

doi:10.3969/j.issn.1006-267x.2013.10.009

2013 , Vol. 25 >Issue 10: 2254 - 2265

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.10.009

Poultry Nutrition

Effects of High Temperature and Dietary Crude Protein Level on Performance, Nitrogen Metabolism and Emission in Broilers

CHEN Yan ,
FENG Jinghai ,
ZHANG Minhong ,
LIU Quanwei ,
JIANG Liwen

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1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
2. Institute of Animal Science and Veterinary Medicine, Hainan Academy of Agricultural Sciences, Haikou 571100, China

Received date: 2013-04-26

Online published: 2013-09-16

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Abstract

This experiment was conducted to study the effects of high temperature and dietary crude protein level on performance, nitrogen metabolism and emission in broilers aged 28 to 42 days. A total of 576 Arbor Acres broilers were chosen in this experiment and an experimental design with 2 factors and 3 levels per factor was used: factor 1 was feeding mode, namely, 23 ℃ ad libtum (AL), 23 ℃ pair-fed (PF, the diet was supplied according to the feed intake of broilers at a cyclic high temperature of 28 ℃-32 ℃-28 ℃) and 28/32 ℃ ad libtum (AL, at a cyclic high temperature of 28 ℃-32 ℃-28 ℃); factor 2 was dietary crude protein level, namely, 21.19%, 18.18% and 14.90%, and Met, Lys, Thr and Trp levels in the diets of all groups were the same and could meet the need of broilers by supplementing synthetic essential amino acids. The broilers were randomly divided to 9 groups with 8 replicates per group and 8 broilers per replicate. The results showed as follows: 1) at the same dietary crude protein level, the body weight (BW), average daily gain (ADG) and average daily feed intake (ADFI) of 28/32 ℃ AL group were significantly lower than those of 23 ℃ AL group (P<0.01), but were not significantly different from those of 23 ℃ PF group (P>0.05). Compared with 23 ℃ AL group, the nitrogen utilization of 28/32 ℃ AL group was significantly decreased (P<0.01), while nitrogen excretion per feed intake was significantly increased (P<0.05). 2) When dietary crude protein level was reduced from 21.19% to 14.90% and synthetic essential amino acids were supplemented, nitrogen excretion per weight gain and nitrogen excretion per feed intake were significantly decreased (P<0.01), but nitrogen utilization, BW, ADG and ADFI were not significantly changed (P>0.05). In conclusion, under the daily cycle high temperature condition, performance and nitrogen utilization are significantly decreased, and nitrogen emission is significantly increased. By adding supplemental synthetic essential amino acids, as dietary crude protein level is reduced to 14.90%, nitrogen emission decreases without affecting BW, ADG and ADFI of broilers.

Key words： high temperature; crude protein; broiler; performance; nitrogen emission

Cite this article

CHEN Yan , FENG Jinghai , ZHANG Minhong , LIU Quanwei , JIANG Liwen . Effects of High Temperature and Dietary Crude Protein Level on Performance, Nitrogen Metabolism and Emission in Broilers[J]. Chinese Journal of Animal Nutrition, 2013 , 25(10) : 2254 -2265 . DOI: 10.3969/j.issn.1006-267x.2013.10.009

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