Effects of Different Grinding Particle Sizes of Corn on Performance, Egg Quality and Digestive Function of Laying Hens

ZHANG Jiaqi, QIN Yuchang, LI Junguo, LI Jun, NIU Libin, YU Zhiqin

doi:10.3969/j.issn.1006-267x.2018.02.018

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 2: 542 - 552

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.02.018

Molecular Nutrition

Effects of Different Grinding Particle Sizes of Corn on Performance, Egg Quality and Digestive Function of Laying Hens

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1. Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100193, China;
3. Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Beijing 100081, China

Received date: 2017-08-25

Online published: 2018-02-02

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Abstract

This study was conducted to study the effect of different grinding particle sizes of corn on performance, egg quality and digestive function of laying hens with the same formula. The feed ingredients was ground with a hammer mill, corn was ground with 4.0, 5.0, 6.0, 7.0, 8.0 and 10.0 mm sieve diameters, respectively, and the other feed ingredients were ground with 5.0 mm sieve diameter. A total of 2 592 Roman brown laying hens at 210 days of age were randomly allocated into 6 groups with 6 replicates per group and 72 laying hens per replicate. Different groups were fed different grinding particle sizes diets. The experiment lasted for 16 weeks. The results showed as follows:1) the geometric mean diameter of corn and complete diet was increased with the sieve diameter increased, but the difference of complete diet was smaller. With the sieve diameter increased, the grinding energy consumption was decreased from 3.93 to 1.19 kW·h/t. 2) With the grinding particle size of corn increasing, the average egg weight firstly increased and then decreased, the average egg weight of 5.0 mm sieve diameter group was significantly higher than that of 10.0 mm sieve diameter group (P<0.05). With the grinding particle size of corn increasing, the broken egg rate and soft egg rate were firstly decreased and then increased, the broken egg rate of 6.0 mm sieve diameter group was significantly lower than that of 10.0 mm sieve diameter group (P<0.05), the soft egg rate of 7.0 mm sieve diameter group was significantly lower than that of 4.0 mm sieve diameter group (P<0.05). 3) The yolk ratio of 7.0 mm sieve diameter group was significantly higher than that of 5.0 mm sieve diameter group (P<0.05). 4) The crude protein apparent digestibility of 5.0 mm sieve diameter group was significantly higher than that of 6.0, 7.0, 8.0 and 10.0 mm sieve diameter groups (P<0.05), the gross energy apparent digestibility of 5.0 mm sieve diameter group was significantly higher than that of 4.0, 7.0 and 10.0 mm sieve diameter groups (P<0.05), the dry matter apparent digestibility of 7.0 mm sieve diameter group was significantly higher than that of 4.0 and 10.0 mm sieve diameter groups (P<0.05). 5) The caecal Escherichia coli number of 7.0 mm sieve diameter group was significantly lower than that of 4.0 and 10.0 mm sieve diameter groups (P<0.05), the jejunum index of 5.0 mm sieve diameter group was significantly higher than that of 6.0, 7.0 and 8.0 mm sieve diameter groups (P<0.05), the chyme pH in proventriculus of 8.0 mm sieve diameter group was significantly lower than that of 4.0 and 5.0 mm sieve diameter groups (P<0.05), the chyme pH in ileum of 6.0 mm sieve diameter group was significantly higher than that of 4.0, 5.0, 7.0 and 10.0 mm sieve diameter groups (P<0.05). It can be concluded that aims at the diet of laying hens, 6.0 mm sieve diameter for grinding corn can get the better performance and egg quality, and it is good for intestinal health of laying hens.

Key words： corn grinding particle size; laying hens; grinding energy consumption; performance; egg quality; digestive function

Cite this article

ZHANG Jiaqi, QIN Yuchang, LI Junguo, LI Jun, NIU Libin, YU Zhiqin . Effects of Different Grinding Particle Sizes of Corn on Performance, Egg Quality and Digestive Function of Laying Hens[J]. Chinese Journal of Animal Nutrition, 2018 , 30(2) : 542 -552 . DOI: 10.3969/j.issn.1006-267x.2018.02.018

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