scholarly journals Effect of Low Calcium Diet on Messenger Ribonucleic Acid Levels of Calbindin-D28K of Intestine and Shell Gland in Laying Hens in Relation to Egg Shell Quality.

1999 ◽  
Vol 36 (5) ◽  
pp. 295-303 ◽  
Author(s):  
Teruko IEDA ◽  
Noboru SAITO ◽  
Kiyoshi SHIMADA
Keyword(s):  
Ribonucleic Acid ◽  
Laying Hens ◽  
Shell Gland ◽  
Shell Quality ◽  
Messenger Ribonucleic Acid ◽  
Calcium Diet ◽  
Low Calcium Diet ◽  
Low Calcium ◽  
Calbindin D28k ◽  
Egg Shell

scholarly journals Pathophysiological characteristics and gene transcriptional profiling of bone microstructure in a low calcium diet fed laying hens

2019 ◽  
Vol 98 (10) ◽  
pp. 4359-4368 ◽  
Author(s):  
S Jiang ◽  
X.L. Wu ◽  
M.L. Jin ◽  
X.Z. Wang ◽  
Q Tang ◽  
...  
Keyword(s):  
Laying Hens ◽  
Transcriptional Profiling ◽  
Bone Microstructure ◽  
Calcium Diet ◽  
Low Calcium Diet ◽  
Low Calcium

The influence of different levels of dietary calcium upon egg-shell thickness, with a study of the relationship between egg-shell thickness and porosity

1946 ◽  
Vol 36 (2) ◽  
pp. 111-116 ◽  
Author(s):  
Cyril Tyler
Keyword(s):  
Shell Thickness ◽  
Dietary Calcium ◽  
Calcium Diet ◽  
Low Calcium Diet ◽  
Low Calcium ◽  
Egg Shell ◽  
The Relationship ◽  
Different Levels

1. The influence of different levels of dietary calcium upon egg-shell thickness and uniformity of egg-shell thickness is discussed.2. The low calcium diet caused a gradual thinning of the shell, but no soft-shelled eggs were laid.

scholarly journals 318 Total flavonoids from Rhizoma drynariae ameliorate low calcium-induced osteoporosis by regulating the bone metabolism in caged laying hens

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 6-7
Author(s):  
Jie Huang ◽  
Lei Zhang ◽  
Zhongxin Zhou
Keyword(s):  
Bone Density ◽  
Laying Hens ◽  
Test Group ◽  
Economic Losses ◽  
Control Group ◽  
Total Flavonoids ◽  
Calcium Diet ◽  
Low Calcium Diet ◽  
Low Calcium ◽  
Rhizoma Drynariae

Abstract Cage layer osteoporosis (CLO) is one of the most serious bone metabolic diseases in laying hens industry. This disease not only causes huge economic losses, but also greatly affects the welfare of animals. Traditional Chinese medicines are widely used for prevention and treatment of all kinds of diseases. It is famous for excellent treatment, low side effects, and wide range of use safety. Total flavonoids from Rhizoma drynariae (TFRD) is an herbal product extracted from the dried root of Rhizoma drynariae. Recently, many researcher reports about the beneficial effects of TFRD in relation to various types of bone conditions but no report is available about promoting effect of TFRD against CLO. Therefore, current study was conducted to explore the ameliorating effect of TFRD in low calcium-induced osteoporosis. A total of 144 Lohmann pink-shell laying hens of 31-week-old were equally distributed in four groups: The control group (containing calcium 3.5% in based diet), the low calcium group (containing calcium 1.5% in low-calcium diet), the test group 1 (adding 500 mg/kg TFRD to low-calcium diet), the test group 2 (adding 2000 mg/kg TFRD to low-calcium diet). The birds were fed the diets for 60 d. The bone mineral density of tibia was measured by dual-energy X-ray absorptiometry indicating that the low calcium group had lower bone density than the control group. Compared with the low calcium group, the supplementation of TFRD protects bone tissue and prevents bone density from decreasing. Serum biochemical analysis showed that TFRD supplementation decreased the level of alkaline phosphatase, tartrate-resistant acid phosphatase, osteocalcin and calcitonin. Therefore, adding TFRD to low-calcium diet can improve the activity of important biochemical markers, clearly inhibit bone resorption and alleviate osteoporosis induce by low-calcium diet in caged laying hens.

scholarly journals Changes in Egg Shell Quality and Pesticide Content of Laying Hens or Pullets Fed DDT in High or Low Calcium Diets

1973 ◽  
Vol 52 (2) ◽  
pp. 648-653 ◽  
Author(s):  
Helene C. Cecil ◽  
Joel Bitman ◽  
George F. Fries ◽  
Susan J. Harris ◽  
R.J. Lillie
Keyword(s):  
Laying Hens ◽  
Shell Quality ◽  
Low Calcium ◽  
Egg Shell

The influence of saline drinking water on the activity of carbonic anhydrase in the shell gland of laying hens

1989 ◽  
Vol 40 (5) ◽  
pp. 1111 ◽  
Author(s):  
I Yoselewitz ◽  
D Balnave
Keyword(s):  
Drinking Water ◽  
Carbonic Anhydrase ◽  
Laying Hens ◽  
Specific Activity ◽  
Carbonic Anhydrase Activity ◽  
Shell Gland ◽  
Shell Quality ◽  
The Poor ◽  
Egg Shell ◽  
Reduced Activity

Carbonic anhydrase activity was measured in three experiments using mucosal extracts from the shell gland of laying hens given drinking water consisting of town water with or without the addition of sodium chloride (2 g/l). Hens laying eggs with normal or defective shells on both treatments were used. The specific activity of carbonic anhydrase was significantly lower in hens receiving the saline drinking water, but egg shell type had no significant effect on enzyme activity. The results indicate that a reduced activity of carbonic anhydrase in the shell gland contributes to the poor egg shell quality observed in hens receiving saline drinking water.

scholarly journals Icariin protects against cage layer osteoporosis by intervening in steroid biosynthesis and glycerophospholipid metabolism

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Zhengwang Yu ◽  
Jie Huang ◽  
Zhongxin Zhou
Keyword(s):  
Metabolic Diseases ◽  
Chinese Herb ◽  
Therapeutic Effects ◽  
Mineral Density ◽  
Steroid Biosynthesis ◽  
Metabolic Pathway Analysis ◽  
Effective Prevention ◽  
Calcium Diet ◽  
Low Calcium Diet ◽  
Low Calcium

AbstractCage layer osteoporosis (CLO) is a common bone metabolism disease in the breeding industry of China. However, effective prevention for CLO has not been developed. Icariin (ICA), the main bioactive component of the Chinese herb Epimedium, has been shown to have good therapeutic effects on bone-related diseases. In this study, the effects of ICA were further evaluated in a low-calcium diet-induced CLO, and a serum metabolomics assay was performed to understand the underlying mechanisms. A total of 144 31-wk-old Lohmann pink-shell laying hens were randomly allocated to 4 groups with 6 replicates of 6 hens per replicate. The 4 dietary treatment groups consisted of a basal diet (3.5% calcium), a low-calcium diet (2.0% calcium), and a low-calcium diet supplemented with 0.5 or 2.0 g/kg ICA. The results showed that ICA exerted good osteoprotective effects on low-calcium diet-induced CLO. ICA significantly increased femur bone mineral density, improved bone microstructure, decreased bone metabolic level, and upregulated mRNA expression of bone formation genes in femoral bone tissue. Serum untargeted metabolomics analysis showed that 8 metabolite levels were significantly changed after ICA treatment, including increased contents of 7-dehydrocholesterol, 7-oxocholesterol, desmosterol, PC (18:1(9Z)/18:1(9Z)), PS (18:0/18:1(9Z)), N,N-dimethylaniline and 2-hydroxy-butanoic acid and decreased N2,N2-dimethylguanosine. Metabolic pathway analysis based on the above 8 metabolites indicated that ICA mainly perturbed steroid biosynthesis and glycerophospholipid metabolism. These findings suggest that ICA can effectively prevent bone loss in low-calcium diet-induced CLO by mediating steroid biosynthesis and glycerophospholipid metabolism and provide new information for the regulation of bone metabolic diseases.

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