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Effects of Dietary Crude Protein Levels on Performance of Jining Bairi Laying Hens

  • YIN Ruoxin ,
  • CAO Bingjian ,
  • HU Xiyi ,
  • DING Xiangwen ,
  • SU Pengcheng ,
  • SONG Zhigang
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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, Jinan 250023, China

Received date: 2015-11-29

  Online published: 2016-05-24

Abstract

This experiment was conducted to study the effects of dietary crude protein levels on performance of Jining Bairi laying hens, and to establish factorial model of crude protein requirements, and to define the crude protein requirements of Jining Bairi laying hens. A single-factor completely randomized experiment design was applied. The crude protein levels of the experimental diets were 13%, 14%, 15%, 16% and 17%, while the other nutrients remained unchanged. A total of 525 healthy 40-week-old Jining Bairi laying hens with similar weight were randomly allocated into 5 groups with 5 replicates per group and 21 chickens per replicate. The pretest period lasted for 7 days and the experimental period lasted for 56 days. The results showed as follows:1) dietary crude protein levels had extremely significant effects on average daily crude protein intake (ADCPI) of Jining Bairi laying hens (P<0.01), and ADCPI significantly increased with the increase of dietary crude protein level (P<0.05). 2) Dietary crude protein levels had significant effects on hen-day egg number, hen-day laying rate, average egg weight and average daily egg mass (ADEM) (P<0.05), and which had extremely significant effects on feed/egg of Jining Bairi laying hens from 41 to 48 weeks (P<0.01). The hen-day egg number, hen-day laying rate and ADEM in high crude protein level groups (16% and 17%) were higher than those in low crude protein level groups (13%, 14% and 15%). The average egg weight showed a rising tendency with increasing dietary crude protein level from 13% to 16%. 3) ADCPI as the dependent variable, average daily gain (ADG), ADEM and metabolic weight (BW0.75) as the independent variable, the factorial models of crude protein requirements of Jining Bairi laying hens as follow:ADCPI=0.2680ADG+0.2711ADEM+3.2993BW0.75 (R2=0.9934). In conclusion, the suitable dietary crude protein level for the optimal performance of Jining Bairi laying hens from 41 to 48 weeks is 15.49%.

Cite this article

YIN Ruoxin , CAO Bingjian , HU Xiyi , DING Xiangwen , SU Pengcheng , SONG Zhigang . Effects of Dietary Crude Protein Levels on Performance of Jining Bairi Laying Hens[J]. Chinese Journal of Animal Nutrition, 2016 , 28(5) : 1549 -1557 . DOI: 10.3969/j.issn.1006-267x.2016.05.032

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