Gert Richter

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Four experiments with 270, 44, 432 and 66800 Leghorn hens were carried out to investigate the influence of various Mn additions to diets differed in mineral or Ca contents on egg shell quality. The addition of 300 mg Mn/kg diet improved significantly egg shell breaking strength by 4 N over one year. The supply of 50-500 mg Mn/kg diet for 10-24 weeks of the(More)
In 4 experiments with a total of 1296 laying hens it was ascertained that a laying hen requires 1 mg vitamin E/kg feed for egg production if the ration contains sufficient selenium and is not rich in multiply unsaturated fatty acids. For the fertilization of the eggs little more of this vitamin is required. There were close relations, however, between the(More)
In 5 experiments with 1,296 laying hybrids at the age of 22-73 weeks producing eggs for consumption a varied supplementation of between 0 and 20 mg vitamin E per kg of a semisynthetic ration was tested. The vitamin E content of the basal ration was less than 1 mg per kg feed. The quotas of selenium and unsaturated fatty acids in the feed were taken into(More)
In an experiment with 405 Hisex white hens rations with 5-20% low glucosinolate rapeseed (RS) or rapeseed meal (RSM) of 00 quality were used. Feed intake, egg production, individual egg weight and live weight gain were reduced in hens fed 5-20% RS and 10-20% RSM. There was a positive correlation between the RS proportion in the ration and the thyroid weight(More)
Four groups of five fattening bulls each consumed a concentrate--wheat straw-diet (2.5:1) supplemented with either 0, 7, 14 or 21% ground rape seed for 350 days. Rape seed contained 427 g crude fat (ether extract) and 127 mg vitamin E per kg dry matter. The supplementation with rapeseed increased the fat concentrations in the rations from 25 to 50, 75 and(More)
The influence of different Ca- and/or P-supply on metabolic parameters and Ca-resp. P-balance was tested in 12 balance trials with mature wethers at different feeding regimes. Furthermore the influence of dietary Ca-excess on metabolic parameters and fattening performance of bulls was also tested. Increasing the P-intake at normal Ca-supply (Ca/P-ratio(More)
The aim of this study was to evaluate the clinical effectiveness of an Ormocer-based restorative system for treatment of mixed carious and non-carious class V cavities. 70 restorations in 25 patients were placed with the condensable material Admira (group 1). In a second group of eight patients, the treatment of 25 cavities took place with the flowable(More)
In two experiments with 1,250 laying hybrids the influence of the elimination of vitamin E and antioxidant supplements to the laying hen feed was tested. With mixed feed according to official quality requirements but without vitamin E and antioxidant supplements laying hens achieved the same laying performance and individual weight as the control group.(More)
In a individual feeding experiment (348 days) 24 fattening bulls were given either a ration high in roughage (2.8 kg concentrate mixture, wheat straw ad libitum: group I) or high in concentrate (5.6 kg concentrate mixture, wheat straw ad libitum group II) supplemented with various levels of vitamin D3 (0, 250, 500, 1,000, 2,000, 4,000 and 8,000 IU per 100(More)
In a multi-generation trial with 120 or 96 hens of the breed White Leghorn per group the effect of diets containing 7.5% or 15.0% of methanol-grown dried bacterial cells was examined. The hens were kept in conventional three-stage battery. In two of the three experiments the feed intake was decreased if it was used methanol-grown bacterial cells as a(More)