Effects of Dietary Crude Protein Level on Performance and Egg Quality of Wenshang Luhua Chickens

WANG Shaokun, YIN Ruoxin, WANG Jinsheng, ZHONG Guang, WANG Yanhui, QU Kunpeng, ZHANG Shuai, SONG Zhigang

doi:10.3969/j.issn.1006-267x.2017.10.013

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 10: 3523 - 3529

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.10.013

Molecular Nutrition

Effects of Dietary Crude Protein Level on Performance and Egg Quality of Wenshang Luhua Chickens

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1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
2. Poultry Institute, Shandong Academy of Agricultural Science, Ji'nan 250023, China;
3. Shandong Fengxiang Group Limited Liability Company, Yanggu 252300, China

Received date: 2017-04-10

Online published: 2017-09-28

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Abstract

This experiment conducted to investigate the effects of dietary crude protein level on performance and egg quality of Wenshang Luhua chickens, aiming to establish factorial model of crude protein requirement, and to define the crude protein requirement of Wenshang Luhua chickens in laying period. A single-factor experiments design was applied, and a total of 360 healthy 30-week-old Wenshang Luhua chickens with similar body weight were randomly allocated to 5 groups with 6 replicates per group and 12 chickens per replicate. Chickens in the 5 groups were fed the experimental diets which the crude protein levels were 13%, 14%,15%, 16% and 17%, respectively. The pretest period lasted for 7 days and the experiment period lasted for 35 days. The results showed as follows:1) the average daily crude protein intake (ADCPI) was significantly increased with dietary crude protein level increasing (P<0.05); the egg number, laying rate and average daily egg mass (ADEM) were firstly increased then decreased with dietary crude protein level increasing, which in 16% crude protein level group got the maximum values, and significantly higher than those in 13% and 14% crude protein level groups (P<0.05). 2) The egg weight in 13% crude protein level group was significantly lower than that in other groups (P<0.05). The Haugh unit in 16% and 17% crude protein level groups was significantly lower than that in 13% crude protein level group (P<0.05 or P<0.01). The yolk color in 13% crude protein level group was significantly lower than that in 14%, 15% and 16% crude protein level groups (P<0.05). In the aspect of eggshell color, the lightness in 16% group was significantly higher than that in 14% crude protein level group (P<0.05), and the redness in 13% group was significantly higher than that in 16% crude protein level group (P<0.05). 3) Given ADCPI as the dependent variable, average daily gain (ADG), ADEM and metabolic weight (BW^0.75) as the independent variable, the factorial model of dietary crude protein requirement of Wenshang Luhua chickens was as follows:ADCPI=0.02ADG+0.22ADEM+4.20BW^0.75 (R²=974 5,P<0.05). In conclusion, the suitable dietary crude protein level of Wenshang Luhua laying hens aged from 31 to 36 weeks is 15.55%.

Key words： Wenshang Luhua laying hens; crude protein; performance; egg quality

Cite this article

WANG Shaokun, YIN Ruoxin, WANG Jinsheng, ZHONG Guang, WANG Yanhui, QU Kunpeng, ZHANG Shuai, SONG Zhigang . Effects of Dietary Crude Protein Level on Performance and Egg Quality of Wenshang Luhua Chickens[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3523 -3529 . DOI: 10.3969/j.issn.1006-267x.2017.10.013

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