scholarly journals The effect of different levels of nonphytate phosphorus with and without phytase on the performance of four strains of laying hens

2003 ◽  
Vol 82 (1) ◽  
pp. 71-91 ◽  
Author(s):  
K Keshavarz
Keyword(s):  
Laying Hens ◽  
Nonphytate Phosphorus ◽  
Different Levels

scholarly journals Effects of Different Methionine Levels in Low Protein Diets on Production Performance, Reproductive System, Metabolism, and Gut Microbiota in Laying Hens

2021 ◽  
Vol 8 ◽  
Author(s):  
Miaolin Ma ◽  
Shunju Geng ◽  
Meiling Liu ◽  
Lihong Zhao ◽  
Jianyun Zhang ◽  
...  
Keyword(s):  
Reproductive System ◽  
Laying Hens ◽  
Production Performance ◽  
Protein Diet ◽  
Low Protein Diet ◽  
Microbial Composition ◽  
Low Protein ◽  
System Metabolism ◽  
Protein Diets ◽  
Different Levels

This study investigated the effects of different levels of methionine (Met) in a low protein diet on the production performance, reproductive system, metabolism, and gut microbial composition of laying hens to reveal the underlying molecular mechanism of Met in a low protein diet on the host metabolism and gut microbial composition and function of hens. A total of 360 healthy 38-week-old Peking Pink laying hens with similar body conditions and egg production (EP) were randomly divided into four groups with nine replicates per treatment and 10 hens per replicate. The hens in each treatment group were fed low protein diets containing different levels of Met (0.25, 0.31, 0.38, and 0.47%, respectively) for 12 weeks. Feed and water were provided ad libitum throughout the trial period. The results showed that, compared with the 0.25% Met group, the final body weight (FBW), average daily gain (ADG), EP, egg weight (EW), and average daily feed intake (ADFI) in the other groups were significantly increased and feed egg ratio (FER) was decreased. Meanwhile, the EW and yield of abdominal fat (AFY) in the 0.47% Met group were higher than those in other groups. The triglyceride (TG), estradiol (E2), total protein (TP), albumin (ALB), and immunoglobulin A (IgA) in the 0.38 and 0.47% Met groups were higher than those in other groups. In addition, 16S rRNA gene sequencing revealed that there was no difference in the Sobs index, ACE index, and Shannon index among all groups. However, it is worth noting that feeding low protein diets with Met changed the gut microbial composition (e.g., the supplementation of Met increased the level of Lactobacillus and decreased the proportion of Faecalibacterium). Also, our results showed that the changes in gut microbial composition induced by the diets with different levels of Met were closely related to the changes of key parameters: ADFI, EW, FBW, TG, EM, EP, ADG, FER, and uric acid (UA). Our results highlight the role of adding an appropriate amount of Met to the low protein diet in laying hens, which could improve the gut microbial composition, production performance, reproductive system, and nutrient metabolism of laying hens. In conclusion, this study suggested that when the Met level was 0.38%, the production performance of the laying hens was pretty good.

scholarly journals Nitrogen-15 Determination in Tissues of Laying Hens Fed on Different Levels of 15N-Chlorocholine Chloride (15N-CCC) Diets

2007 ◽  
Vol 20 (3) ◽  
pp. 412-417
Author(s):  
Nurhayati ◽  
Grete Thinggaard ◽  
S. Chakeredza ◽  
A. Reineking ◽  
R. Langel ◽  
...  
Keyword(s):  
Laying Hens ◽  
Chlorocholine Chloride ◽  
Different Levels

scholarly journals Bone quality of laying hens fed different levels of fiber in the growth phase (7 to 17 weeks of age)

2012 ◽  
Vol 41 (9) ◽  
pp. 2032-2038 ◽  
Author(s):  
Carlos Eduardo Braga Cruz ◽  
Ednardo Rodrigues Freitas ◽  
Nadja Naiara Pereira Farias ◽  
Regina Patrícia de Souza Xavier ◽  
Jayron dos Santos Correia Lima ◽  
...  
Keyword(s):  
Bone Quality ◽  
Growth Phase ◽  
Laying Hens ◽  
Different Levels

scholarly journals Enzyme complex at different levels in diets with enriched ingredients for commercial laying hens

2019 ◽  
Vol 48 ◽  
Author(s):  
Jaqueline de Cássia Ramos da Silva ◽  
Carlos Bôa-Viagem Rabello ◽  
Maria do Carmo Mohaupt Marques Ludke ◽  
Cláudia da Costa Lopes ◽  
Emmanuele Maria Florêncio de Arruda ◽  
...  
Keyword(s):  
Laying Hens ◽  
Enzyme Complex ◽  
Different Levels
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