Dietary Lysine Requirement of Jinghong Pullets during the Growing Period

WANG Xiaocui, WU Shugeng, SONG Dan, QI Guanghai, WANG Jing, ZHANG Haijun, YUE Hongyuan

doi:10.3969/j.issn.1006-267x.2017.04.007

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 4: 1132 - 1140

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.04.007

Molecular Nutrition

Dietary Lysine Requirement of Jinghong Pullets during the Growing Period

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National Engineering Research Center of Biological Feed, Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2016-10-09

Online published: 2017-04-14

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Abstract

This study was conducted to investigate the dietary lysine (Lys) requirement of Jinghong commercial pullets during the growing period. Four hundred and fifty 8-week-old Jinghong commercial pullets were randomly divided into 5 groups with 6 replicates per group and 15 pullets per replicate. The levels of Lys in diets were 0.56%, 0.62%, 0.68%, 0.74% and 0.80%, respectively. The test lasted for 9 weeks. The results showed that the average daily gain (ADG) and community evenness of Jinghong pullets aged from 9 to 17 weeks were quadratically significantly increased and then decreased with increasing dietary Lys levels (P<0.05), while the ratio of feed to gain (F/G) was quadratically significantly decreased and then increased (P<0.05). ADG in 0.62% Lys group was significantly higher than that in 0.56% and 0.80% Lys groups (P<0.05), while the F/G in 0.62% Lys group was significantly lower than that in 0.56% and 0.80% Lys groups (P<0.05). The community evenness in 0.68% Lys group was significantly higher than that in 0.56% and 0.80% Lys groups (P<0.05). The body weight, chest width and tibia length of Jinghong pullets at 17 weeks were quadratically significantly increased and then decreased with increasing dietary Lys levels (P<0.05), and the body weight, chest width and tibia length in 0.68% Lys group were significantly higher than those in 0.74% and 0.80% Lys groups (P<0.05). The ovary weight, ovary index, fallopian tube weight, fallopian tube index and fallopian tube length of Jinghong pullets at 17 weeks were quadratically significantly increased and then decreased with increasing dietary Lys levels (P<0.05), and the reproductive organs development indexes in 0.68% Lys group were significantly higher than those in the other groups (P<0.05). The follicle numbers in ovary of Jinghong pullets at 17 weeks were quadratically significantly increased and then decreased with increasing dietary Lys levels (P<0.05), and the total follicle numbers, primary follicle numbers, secondary follicle numbers and small yellow follicle numbers in 0.68% Lys group were significantly higher than those in the other groups (P<0.05). According to the quadratic regression analysis based on ovary weight, ovary index, the total follicle numbers, primary follicle numbers, secondary follicle numbers, the optimal dietary Lys levels for Jinghong pullets at 17 weeks were 0.65%, 0.65%, 0.64%, 0.64% and 0.64%, respectively. These studies indicate that the dietary Lys requirement of Jinghong pullets aged from 9 to 17 weeks is 0.64% to 0.65%.

Key words： lysine; growing period; Jinghong pullets; reproduction organs development

Cite this article

WANG Xiaocui, WU Shugeng, SONG Dan, QI Guanghai, WANG Jing, ZHANG Haijun, YUE Hongyuan . Dietary Lysine Requirement of Jinghong Pullets during the Growing Period[J]. Chinese Journal of Animal Nutrition, 2017 , 29(4) : 1132 -1140 . DOI: 10.3969/j.issn.1006-267x.2017.04.007

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