Potentiation of Terramycin II. Evaluation of Low Dietary Calcium in Laying Hen Diets

1961 ◽  
Vol 5 (4) ◽  
pp. 409 ◽  
Author(s):  
P. W. Waldroup ◽  
R. H. Harms
Keyword(s):  
Dietary Calcium ◽  
Laying Hen

scholarly journals Effects of Dietary Calcium Sources and Particle Size on Laying Hen Performance

1981 ◽  
Vol 60 (12) ◽  
pp. 2648-2654 ◽  
Author(s):  
R.D. BRISTER ◽  
S.S. LINTON ◽  
C.R. CREGER
Keyword(s):  
Particle Size ◽  
Dietary Calcium ◽  
Laying Hen ◽  
Calcium Sources

scholarly journals FEED UTILIZATION AND THE COMPOSITION OF ORGANS OF THREE STRAINS OF LAYING HENS FED CONSTANT ZINC AND VARYING LEVELS OF CALCIUM

2021 ◽  
Vol 4 (2) ◽  
pp. 18-23
Author(s):  
B. K. Ogunmodede ◽  
E. G. Ijagbuji
Keyword(s):  
Egg Production ◽  
Laying Hens ◽  
Dietary Calcium ◽  
Feed Utilization ◽  
Laying Hen ◽  
Tissue Accumulation ◽  
Bone Calcium ◽  
Egg Shell ◽  
The Tropics

At about 16 mg, zinc per 100 gm of diet feed consumed by laying hens increased until a level of 2.0% dietary calcium. Increasing the dietary calcium to 2.0% also stimulated more egg production. When less than 2.0% dietary calcium was fed more feed was required to produce a dozen egg and the eggs were of small sizes. The egg shell strength and the bone calcium were improved when at least 2.0% dietary calcium was given to the laying hen. These results were correlated with tissue accumulation of zinc thus establishing that for profitable egg production in the tropics 2.0% dietary calcium is required when 16 mg zinc per 100 grains of feed is given 

scholarly journals Interactions of genotype, housing and dietary calcium in layer performance, eggshell quality and tibia characteristics

1970 ◽  
Vol 46 (3) ◽  
pp. 285-293
Author(s):  
E. Tůmová ◽  
J. Vlčková ◽  
V. Charvátová ◽  
O. Drábek ◽  
V. Tejnecký ◽  
...  
Keyword(s):  
Significant Interaction ◽  
Dietary Calcium ◽  
Laying Hen ◽  
Ash Content ◽  
Shell Weight ◽  
Egg Weight ◽  
Eggshell Quality

The study was designed to evaluate the interactions in performance, eggshell quality and tibia traits of two laying hen genotypes, namely a commercial hybrid, Lohmann (LSL), and a traditional breed, the Czech Hen (CH), housed in conventional cages and on litter, and fed two levels of dietary calcium (Ca) (3.5% vs. 3.0%). A significant interaction between genotype, housing and Ca was determined in egg weight. The heaviest eggs were laid by LSL hens housed in cages and fed 3.0% Ca (61.8 g), and the lightest laid by CH, also in cages on 3.0% Ca (47.3 g). Eggshell strength and shell weight were significantly affected by three-way interaction. Czech hens kept in cages and fed 3.0% Ca produced the strongest shells (4480 g/cm2), whereas the CH in cages on 3.5% Ca had the weakest (3665 g/cm2) shells. Hens housed on litter had significantly stronger tibias than hens housed in cages (485 vs. 397 N). With respect to genotype, tibias were stronger in CH. Housing and level Ca in feed had a significant effect on tibia weight. However, none of these factors affected tibia thickness or ash content. Tibia Ca content was higher in caged birds than in those on litter. The results of the study show that interaction between housing, genotype and Ca resulted in large differences in measurements of egg weight and eggshell quality. Tibia characteristics were less affected by the treatments, and no interactions were evident in the variables.

Higher Dietary Acidity is Associated with Lower Bone Mineral Density in Postmenopausal Iranian Women, Independent of Dietary Calcium Intake

2014 ◽  
Vol 84 (3-4) ◽  
pp. 0206-0217 ◽  
Author(s):  
Seyedeh-Elaheh Shariati-Bafghi ◽  
Elaheh Nosrat-Mirshekarlou ◽  
Mohsen Karamati ◽  
Bahram Rashidkhani
Keyword(s):  
Calcium Intake ◽  
Dietary Calcium ◽  
Dietary Calcium Intake ◽  
Dietary Intakes ◽  
Iranian Women ◽  
Acid Base Balance ◽  
Mineral Density ◽  
Acid Base ◽  
Base Balance ◽  
Dietary Acid

Findings of studies on the link between dietary acid-base balance and bone mass are relatively mixed. We examined the association between dietary acid-base balance and bone mineral density (BMD) in a sample of Iranian women, hypothesizing that a higher dietary acidity would be inversely associated with BMD, even when dietary calcium intake is adequate. In this cross-sectional study, lumbar spine and femoral neck BMDs of 151 postmenopausal women aged 50 - 85 years were measured using dual-energy x-ray absorptiometry. Dietary intakes were assessed using a validated food frequency questionnaire. Renal net acid excretion (RNAE), an estimate of acid-base balance, was then calculated indirectly from the diet using the formulae of Remer (based on dietary intakes of protein, phosphorus, potassium, and magnesium; RNAERemer) and Frassetto (based on dietary intakes of protein and potassium; RNAEFrassetto), and was energy adjusted by the residual method. After adjusting for potential confounders, multivariable adjusted means of the lumbar spine BMD of women in the highest tertiles of RNAERemer and RNAEFrassetto were significantly lower than those in the lowest tertiles (for RNAERemer: mean difference -0.084 g/cm2; P=0.007 and for RNAEFrassetto: mean difference - 0.088 g/cm2; P=0.004). Similar results were observed in a subgroup analysis of subjects with dietary calcium intake of >800 mg/day. In conclusion, a higher RNAE (i. e. more dietary acidity), which is associated with greater intake of acid-generating foods and lower intake of alkali-generating foods, may be involved in deteriorating the bone health of postmenopausal Iranian women, even in the context of adequate dietary calcium intake.

Dietary Calcium Supplementation Suppresses Bone Formation in Magnesium-Deficient Rats

2006 ◽  
Vol 76 (3) ◽  
pp. 111-116 ◽  
Author(s):  
Hiroshi Matsuzaki ◽  
Misao Miwa
Keyword(s):  
Bone Formation ◽  
Calcium Supplementation ◽  
Control Diet ◽  
Formation Rate ◽  
Dietary Calcium ◽  
Mineral Apposition Rate ◽  
Control Group ◽  
Deficient Diet ◽  
Bone Formation Rate ◽  
Male Wistar Rats

The purpose of this study was to clarify the effects of dietary calcium (Ca) supplementation on bone metabolism of magnesium (Mg)-deficient rats. Male Wistar rats were randomized by weight into three groups, and fed a control diet (control group), a Mg-deficient diet (Mg- group) or a Mg-deficient diet having twice the control Ca concentrations (Mg-2Ca group) for 14 days. Trabecular bone volume was significantly lower in the Mg - and Mg-2Ca groups than in the control group. Trabecular number was also significantly lower in the Mg - and Mg-2Ca groups than in the control group. Mineralizing bone surface, mineral apposition rate (MAR), and surface referent bone formation rate (BFR/BS) were significantly lower in the Mg - and Mg-2Ca groups than in the control group. Furthermore, MAR and BFR/BS were significantly lower in the Mg-2Ca group than in the Mg - group. These results suggest that dietary Ca supplementation suppresses bone formation in Mg-deficient rats.

THE UPTAKE OF (6,7-3H) 17β-OESTRADIOL BY TISSUES OF THE DOMESTIC FOWL

1969 ◽  
Vol 60 (2) ◽  
pp. 199-209 ◽  
Author(s):  
R. A. Hawkins ◽  
P. J. Heald ◽  
Patricia Taylor
Keyword(s):  
Pituitary Gland ◽  
Intravenous Injection ◽  
Domestic Fowl ◽  
Physiological State ◽  
Laying Hen ◽  
Adult Bird

ABSTRACT A limited investigation of the distribution of radioactivity in the tissues of the adult laying hen has been made at differing times after intravenous injection of (6,7-3H) 17β-oestradiol. Uptake by all tissues examined was maximal between 2.0 and 4.0 minutes after injection. There was a marked retention of radioactivity by the oviduct and the liver. Of cerebral tissues examined the uptake of radioactivity was greatest in the pituitary gland. This uptake varied according to the physiological state of the bird. Calculations based on the rates of clearance of intravenous (6,7-3H) 17β-oestradiol indicate that in the adult bird the rate of secretion by the ovary is of the order of 1–2.0 mg oestradiol/24 h.

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