scholarly journals Effects of reducing dietary protein, methionine, choline, folic acid, and vitamin B12 during the late stages of the egg production cycle on performance and eggshell quality

2003 ◽  
Vol 82 (9) ◽  
pp. 1407-1414 ◽  
Author(s):  
K Keshavarz
Keyword(s):  
Folic Acid ◽  
Vitamin B12 ◽  
Dietary Protein ◽  
Egg Production ◽  
Production Cycle ◽  
Eggshell Quality ◽  
Late Stages

scholarly journals Relationship between Bone Quality, Egg Production and Eggshell Quality in Laying Hens at the End of an Extended Production Cycle (105 Weeks)

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 623
Author(s):  
Clara Alfonso-Carrillo ◽  
Cristina Benavides-Reyes ◽  
Jon de los Mozos ◽  
Nazaret Dominguez-Gasca ◽  
Estefanía Sanchez-Rodríguez ◽  
...  
Keyword(s):  
Bone Quality ◽  
Egg Production ◽  
Breaking Strength ◽  
Bone Fractures ◽  
Quality Parameters ◽  
Production Cycle ◽  
Medullary Bone ◽  
Eggshell Quality ◽  
Ash Weight ◽  
Skeletal Integrity

(1) Background: Nowadays the industry aims to improve lay persistency for extended cycles (100 weeks or longer) to make egg production more sustainable. However, intensive egg production challenges hen health, inducing severe osteoporosis and the incidence of bone fractures. In this study, the relationship between bone quality and egg production, and/or eggshell quality, was evaluated at the end of an extended laying cycle of 100 weeks, comparing groups of hens with different production and eggshell quality parameters; (2) Methods: Quality parameters of egg (as weight, egg white height), eggshell (as thickness, weight, breaking strength, elasticity and microstructure) and tibiae bone (weight, diameter, cortical thickness, ash weight, breaking strength, medullary bone) were determined; (3) Results: Hens from groups with a high egg production and good eggshell quality have poorer bone quality (lower ash weight and lesser amount of medullary bone). However, Pearson’s correlation analysis shows no clear relationship between bone and egg/eggshell parameters. (4) Conclusions: Bone and egg production/eggshell quality are independent and can be improved separately. Medullary bone has an important contribution to bone mechanical properties, being important to accumulate enough bone medullary bone early in life to maintain skeletal integrity and eggshell quality in old hens.

Serum levels of folic acid, vitamin B12, and iron in anemia of pregnancy

1966 ◽  
Vol 96 (3) ◽  
pp. 310-315 ◽  
Author(s):  
Fred Benjamin ◽  
Frank A. Bassen ◽  
Leo M. Meyer
Keyword(s):  
Folic Acid ◽  
Vitamin B12 ◽  
Serum Levels

scholarly journals Effect of genotype, age of hens and K/k allele on eggshell quality

2011 ◽  
Vol 56 (No. 5) ◽  
pp. 242-249 ◽  
Author(s):  
Z. Ledvinka ◽  
L. Zita ◽  
M. Hubený ◽  
E. Tůmová ◽  
M. Tyller ◽  
...  
Keyword(s):  
Growth Rate ◽  
Egg Production ◽  
Statistical Significance ◽  
Live Weight ◽  
Shape Index ◽  
Feed Mixture ◽  
Eggshell Quality ◽  
Feather Growth ◽  
Two Factors ◽  
The Relationship

We assessed the influence of the particular genotype, age of layers, feather growth-rate gene, and their mutual interactions on selected indicators of eggshell quality in six groups of hens of the laying type Dominant. The following genotypes were examined in the experiment: Barred Plymouth Rock, Dominant BPR 951 (K) strain, slow-feathering; Barred Plymouth Rock, Dominant BPR 901 (k) strain, fast-feathering; Blue Plymouth Rock, Dominant BLPR 954 (K) strain, slow-feathering; Blue Plymouth Rock, Dominant BLPR 894 (k) strain, fast-feathering; crossbreds of the above strains in the F<sub>1</sub> generation Dominant D 107 blue (K), slow-feathering and Dominant D 107 blue (k), fast-feathering. The layers were fed a feed mixture NP1 (16.64 % CP) from the 20<sup>th</sup> week of age and a feed mixture NP2 (15.02% CP) from the 42<sup>nd</sup> week. Husbandry conditions met the regular requirements of laying hens. Egg production and live weight of hens were monitored for the duration of the experiment (12 months). Eggshell quality was examined at the layers' age of 27, 35 and 56 weeks. The average hen-day egg production for the duration of the experiment (12 months) was not significantly influenced by the particular genotype or the feather growth-rate gene. The varying representation of the feather growth-rate gene significantly (P &le; 0.001) influenced the live weight; similarly, the relationship between the genotype and the representation of K/k alleles was significant. The average egg weight was influenced statistically significantly (P &le; 0.001) by the age of hens, their genotype (P &le; 0.05), feather growth-rate gene (P &le; 0.001), and the relationship between the age and genotype (P &le; 0.001). The age of hens, genotype, and the interaction of these two factors affected the egg shape index, as did the incidence of the feather growth-rate gene within the population (with a statistical significance of P &le; 0.001). The age, genotype and the feather growth-rate gene incidence within the population also significantly affected the eggshell quality indicators. In the eggshell to egg ratio, eggshell thickness and strength, an interaction was determined between the age of hens and their particular genotype. The eggshell colour was also significantly (P &le; 0.001) affected by hens' age, genotype (P &le; 0.001), as well as by the feather growth-rate gene (P &le; 0.001). No significant interaction between the age and the genotype was found for this indicator.

scholarly journals Long-term Effect of Folic Acid and Vitamin B12 Supplementation on Fracture Risk and Cardiovascular Disease: Follow-up Study of B-PROOF Trial (P24-031-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Sadaf Oliai Araghi ◽  
Jessica C Kiefte-de Jong ◽  
Suzanne van Dijk ◽  
Natasja van Schoor ◽  
Lisette CPGM de Groot ◽  
...  
Keyword(s):  
Cardiovascular Disease ◽  
Folic Acid ◽  
Fracture Risk ◽  
Vitamin B12 ◽  
Homocysteine Level ◽  
Fracture Incidence ◽  
Total Homocysteine ◽  
The Hague ◽  
Vitamin B12 Supplementation

Abstract Objectives To investigate the possible effects of the intervention with folic acid and vitamin B12 supplementation on fracture and cardiovascular disease risk: 5–7 years after the end of the intervention period of 2–3 years. Methods Extended follow-up of B-PROOF trial, a multi-center, double-blind randomized placebo-controlled trial designed to assess the effect of 2–3 years daily supplementation with folic acid (400 µg) and vitamin-B12 (500 µg) versus placebo on fracture incidence. Fracture and cardiovascular outcomes were assessed by follow-up questionnaire. Fracture incidence (and a part of cardiovascular disease incidence) was verified by general practitioners (GPs). Results A total of 1298 individuals participated in the second follow-up round. Median age at baseline was 71.0 years [68.0–76.0] for both groups (n = 662 in the treatment group and n = 636 in the placebo group). No effect of the intervention on first osteoporotic fracture and other fracture risk after a follow up of 5–7 years was observed (HR: 0.99, 95% CI: 0.62; 1.59 and HR: 0.77; 95% CI: 0.50; 1.19, respectively) and also not for cardiovascular- or cerebrovascular disease (OR: 1.14; 95%CI: 0.74–1.74 and OR: 1.01; 95%CI: 0.76–1.33, respectively). Significant interaction for total homocysteine level was observed for osteoporotic- and any fracture (P = 0.10 and 0.06 resp.), which indicated a significantly lower risk of fracture in the intervention group with higher total homocysteine level. Conclusions This study does not support a prolonged effect of supplementation of folic acid and vitamin B12 on fracture risk, or on cardiovascular disease in older individuals with elevated homocysteine concentration. However, B-vitamin supplementation may be beneficial in reducing fractures in individuals with higher total homocysteine levels. Funding Sources The initial B-PROOF study has received funding so far by The Netherlands Organization for Health Research and Development (ZonMw), the Hague; unrestricted grant from NZO (Dutch Dairy Association), Zoetermeer; Orthica, Almere; NCHA (Netherlands Consortium Healthy Ageing) Leiden/Rotterdam; Ministry of Economic Affairs, Agriculture and Innovationn, the Hague; Wageningen University, Wageningen; VUmc, Amsterdam; Erasmus Medical Center, Rotterdam. Supporting Tables, Images and/or Graphs

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