the aim of this study was to develop a quantitative radiographic method for assessment of experimentalosteoporosis in leghorn breed laying hens. three groups of 24 leghorn pullets were reared in cage and fed aration containing different calcium levels, including 3.55, 2.075 and 0.6 percent (for groups 1-3, respectively). the hens were fed this diet from 17 weeks of age to the end of the experim...

Susceptibility of caged layers to osteoporosis and cage layer fatigue has prompted the switch from conventional caging to more extensive systems allowing birds to perform load bearing activities. However, high incidences of fractures have been reported in these alternative housing systems. The aim of this study was to determine the housing system and strain effects on bone quality parameters: b...

The effects of age vs. diet, potassium level, tetramethylthiuram disulfide (thiuram), and ionophores in the diet on the development of tibial dyschondroplasia in broilers was investigated. Changing broiler chicks from a diet that induced tibial dyschondroplasia to one that reduced the disease or vice versa caused a change in the incidence in the direction of the last-fed diet; however, in most ...

Emerald ash borer (Agrilus planipennis Fairmaire) is an invasive primary pest of North American ash (Fraxinus spp.) trees. Blue ash (F. quadrangulata) is less susceptible to emerald ash borer infestations in the forest than other species of North American ash. Whereas other studies have examined adult host preferences, we compared the capacity of emerald ash borer larvae reared from emerald ash...

GUROFF, GORDON, HECTOR F. DELUCA, AND HARRY STEENBOCK. Citrate and action of vitamin D on calcium and phosphow metabolism. Am. J. Physiol. 20&J: 833-836. 1c~63.-Pantothenic acid and pyridoxine deficiencies in rats greatly minimized the rise in serum citrate following vitamin D administration without affecting the rise in serum calcium, serum phosphorus, and femur ash. In addition, pyridoxine de...

No data are available about the effects of AT1 receptor antagonist losartan on the skeleton and there is also little information on the activity of an ACE inhibitor enalapril on bone metabolism. It is widely believed that the vasculature plays an important role in bone remodeling under normal and pathological conditions. We treated 14-week-old female Wistar rats with losartan, enalapril or sali...

Meat and bone meal is a valuable protein and mineral source in diets of production animals and contributes to the protein, energy and mineral component of diets. The aim of the present study was to more accurately characterise the apparent ileal amino acid digestibility of meat and bone meals produced in New Zealand and evaluate routine in vitro assays used in practise to measure meat and bone ...

INTRODUCTION: The issue of whether, and to what extent, bone materials and fracture characteristics changes in humans with the seasons is complicated by matters of differential seasonal risk factors, nutritional opportunities, and social interaction. Studies examining seasonal bone turnover, density, and fracture risk have been hindered by wide intersubject variation and contradictory results. ...

A/J mice, as compared to C57BL/6J (B6) mice, have a significantly greater total femoral mineral (ash) content which correlates with an increased femoral stiffness (resistance to deformation), but also with an increased brittleness (catastrophic failure). To determine if this whole bone variation in mineral content is indicative of significant mineral and/or matrix variation at the tissue level,...

The mechanical properties of bones are greatly influenced by the ratio of organic constituents to mineral. Determination of bone mineral content on a macroscopic scale is straightforward, but microscopic variations, which can yield new insights into remodelling activities, mechanical strength, and integrity, are profoundly more difficult to measure. Measurement of microscopic mineral content va...