scholarly journals Influence of Dietary Zinc Methionine Supplementation on Eggshell Quality in Laying Hens under Hot Climate Environment.

1997 ◽  
Vol 34 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Kazumi KITA ◽  
Isao HOHMURA ◽  
Jun-ichi OKUMURA
Keyword(s):  
Laying Hens ◽  
Dietary Zinc ◽  
Eggshell Quality ◽  
Hot Climate ◽  
Zinc Methionine ◽  
Methionine Supplementation

scholarly journals Dietary Zinc Methionine Effect on Eggshell Quality of Hens Drinking Saline Water

1992 ◽  
Vol 71 (7) ◽  
pp. 1163-1167 ◽  
Author(s):  
R.E. MORENG ◽  
D. BALNAVE ◽  
D. ZHANG
Keyword(s):  
Saline Water ◽  
Dietary Zinc ◽  
Eggshell Quality ◽  
Zinc Methionine

Dietary addition of zinc-methionine influenced eggshell quality by affecting calcium deposition in eggshell formation of laying hens

2019 ◽  
Vol 122 (9) ◽  
pp. 961-973
Author(s):  
Lanlan Li ◽  
Liping Miao ◽  
Mingkun Zhu ◽  
Liansong Wang ◽  
Xiaoting Zou
Keyword(s):  
Laying Hens ◽  
Atomic Weight ◽  
Calcium Deposition ◽  
Mrna Levels ◽  
Linear Distribution ◽  
Weight Percentage ◽  
Eggshell Formation ◽  
Eggshell Quality ◽  
Shell Matrix ◽  
Zinc Methionine

AbstractThe present study explored the mechanism of Zn-methionine (Zn-Met) influencing eggshell quality of laying hens and investigated whether the mechanism was related to Ca deposition. Hyline grey layers (n 384, 38 weeks old) were divided into four groups: 0 mg Zn/kg, 40, 80 mg Zn/kg as Zn-Met, and 80 mg Zn/kg as zinc sulphate (ZnSO4). Eggshell quality, Zn contents, Zn-containing enzyme activities and expressions of shell matrix proteins in eggshell gland (ESG) were analysed. Zn-Met treatment at 80 mg/kg increased (P < 0·05) egg weight and eggshell strength throughout the experiments. The 80 mg/kg Zn-Met group (P < 0·05) had decreased mammillary knob width and larger relative atomic weight percentage of Ca, stronger signal intensity of Ca in linear distribution and the Ca was more evenly distributed in the transversal surface of eggshell. Zn contents (P < 0·001) in yolk and serum, Ca, albumin (Alb) levels in ESG as well as carbonic anhydrase (CA) activity in serum (P < 0·05) and mRNA levels of CA and Ca-binding protein-d28k (CaBP-D28k) (P < 0·001) in the 80 mg/kg Zn-Met group were the highest among all treatments. In conclusion, shell strength as one of eggshell qualities was mostly related to mammillary cone width in ultrastructure caused by the pattern of Ca deposition in eggshell formation. Also, the increase in Zn-Met-induced Ca deposition may be due to the increased Zn contents in serum and tissues, which were attributable to the increased CA concentrations in serum, Ca, Alb levels and up-regulated CA and CaBP-D28k mRNA levels in ESG.

scholarly journals Prolonged scotophase within a 24-h light regime improves eggshell quality by enhancing calcium deposition in laying hens

2021 ◽  
pp. 101098
Author(s):  
Qian Xin ◽  
Minghui Wang ◽  
Hongchao Jiao ◽  
Jingpeng Zhao ◽  
Haifang Li ◽  
...  
Keyword(s):  
Laying Hens ◽  
Light Regime ◽  
Calcium Deposition ◽  
Eggshell Quality

scholarly journals Prolonged Dark Time Within A 24-h Light Regime Improves Eggshell Quality by Enhancing Calcium Deposition in Laying Hens

2020 ◽  
Author(s):  
Qian Xin ◽  
Jingpeng Zhao ◽  
Hongchao Jiao ◽  
Haifang Li ◽  
Xiaojuan Wang ◽  
...  
Keyword(s):  
Feed Efficiency ◽  
Egg Production ◽  
Laying Hens ◽  
Light Regime ◽  
Calcium Deposition ◽  
Eggshell Quality ◽  
Dark Time ◽  
Calbindin D28k ◽  
Calcium And Phosphorus ◽  
Calcium Transporter

Abstract Background: The absorption and transportation of calcium and phosphorus is mainly relied on their corresponding transporters. Eggshell is mainly formed during dark time in one egg cycle. The aim of this study was to determine the effect of different light regime on eggshell quality and the expression of the relevant calcium and phosphorus transporters in laying hens. Seventy two 56-week-old laying hens were randomly divided into two groups and subjected to the following treatments: 16 h light: 8 h dark (control) and 9 h light: 15 h dark (LDP). The expression of phosphorus transporters type IIb Na/Pi co-transporter NaPi-IIa (NPt2a) and NaPi-IIb (NPt2b), calcium transporter calbindin-D28k (CaBP-D28k), and plasma membrane Ca ATPase 1b (PMCA1b) were measured in small intestine, kidney, and eggshell gland. Results: The results showed that the feed intake (P < 0.001) and egg weight (P = 0.05) was decreased by LDP treatment, while laying rate, egg production, and feed efficiency were not significantly influenced (P > 0.05). Compared to control, eggshell hardness was increased (P < 0.05) by LDP treatment whereas eggshell thickness and eggshell percentage were not significant changed. Eggshell calcium (Ca) and phosphorus (P) contents were elevated in LDP-hens, compared to control birds. Compared to control birds, serum Ca (P < 0.01) and P levels (P = 0.079) at dark time were increased in LDP-hens while and alkaline phosphatase (ALP) activity was lowered (P < 0.05). The protein expression levels of CaBP-D28k and PMCA1b were not influenced in duodenum but were decreased at light time in jejunum of LDP hens. In kidney, the expression of CaBP-D28k, PMCA1b and NPt2a were not changed by LDP treatment. In eggshell gland, however, the expression of CaBP-D28k and osteopontin (OPN) were relative higher in LDP hens compared to control birds, whereas the PMCA1b expression was not altered. Conclusions: The result indicates that the increased circulating Ca and P concentrations in dark time are favorable for the deposition of calcium and phosphorus in eggshell. The result offers an alternative strategy for the laying hen with a worse eggshell problem.

scholarly journals Integument, mortality, and skeletal strength in extended production cycles for laying hens – effects of genotype and dietary zinc source

2021 ◽  
Author(s):  
Helena Wall ◽  
Malin Boyner ◽  
Dirk Jan de Koning ◽  
Andreas Kindmark ◽  
Heather A McCormack ◽  
...  
Keyword(s):  
Laying Hens ◽  
Dietary Zinc ◽  
Zinc Source ◽  
Production Cycles
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