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Biomedical subjects

A Hennig

Publications and source records attributed to A Hennig.

151 records · Page 9Linked to original sources
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[Studies of 15N-labeled lysine in colostomized laying hens. 3. 15N incorporation into the amino acids of the follicle, residual ovary and oviduct].

In a metabolism experiments with 15N-labelled lysine 3 colostomized laying hybrids received over 4 days 0.2% L-Lysine with 48 atom-% 15N-excess (15N') in addition to a ration conventionally produced and, subsequent to this, unlabelled lysine for four days. At the end of the experiment the hens were butchered: individual organs and tissues were prepared for 15N-analysis. The incorporation of the lysine-15N' into the further amino acids in the follicles, the ovary and the oviduct is described. The atom-% 15N' of the complete range of amino acids was analysed in the individual follicles. Various levels of heavy nitrogen could be detected in all essential and non-essential amino acids. Of the total amount of 15N' detected in the follicles 64.0% 65.0% and 61.2% resp. could be detected in lysine and 25.2%, 25.4%, 28.7% resp. in the other amino acids (hens 1 to 3). In the ovary on average 61.6% and on the oviduct 54.2% of the respective 15N'-amount was detected in lysine. In the ovary 10.9% and in the oviduct 8.4% 15N' of the total 15N' of these samples were incorporated into the arginine molecules.

Amino Acids↗
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[Use of mestranol as an anabolic substance in fattening bulls].

In 5 experiments 137 fattening bulls received between 0 and 20 mg Mestranol per animal and day. In one experiment a dose of 10 mg/day reduced consumption. The cause of this effect could not be found. In three experiments Mestranol increased weight gain by 4-13%. Feed expenditure was significantly decreased in only one experiment, in which 5-10 mg were given (average of all experiments: 4%). In dependence on the amount of Mestranol the weight of skin, horn and testicles decreased, when only 5-10 mg were given, however, protein retention increased whereas fat retention decreased. When 20 mg Mestranol are given per animal and day, the anabolic effect is missing although the NEFcattle-expenditure per kJ retention including maintenance decreases. This is due to a higher fat retention, which is causally inexplicable. The ergotropic effect of Mestranol depends on its dosage and possibly the nutrients in the ration.

Animals↗
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[Effect of iodine, copper and zinc supplements to rations with a high quota of rapeseed extract meal on the growth and thyroid function of fattening swine. 2. The effect of the iodine supplement on nutrient digestibility and on protein and energy retention].

Three groups of six pigs each (live weight at the beginning of the experiment 20 kg) were given a cereal ration with 8% rape seed meal. Group I did not receive a J supplement and was fed ad libitum. The rations of groups II and III were supplemented with 1 mg J/kg feed. The feed intake of group II was limited to the amount consumed by group I (pair fed); group III received the feed ad libitum. The daily weight gains of the 3 groups were 327, 377 and 613 g, feed expenditure 3.79, 3.68 and 3.47 kg/kg gain. In an N balance experiment carried out with 3 animals each from groups I and II, 41.4% of the N taken in group I and 43.8% in group II were retained (p greater than 0.05). Liver, intestinal fat and leaf were heavier in group I (p less than 0.01), the protein content of the empty body, the bones and bristles significantly lower than in group II. Protein retention in group II was 14% higher than in group I. In case of iodine deficiency protein retention is lower, energy retention, however, is largely unchanged.

Animal Feed↗
PubMedDate not supplied

[Effect of iodine, copper and zinc supplements to rations with a high quota of rapeseed extract meal on the growth and thyroid function of fattening swine. 3. The effect on weight and the histomorphometric findings in the thyroid and on the serum T3 and T4 concentrations].

Studies were made with a total of 272 fattening pigs. Iodine deficiency both in rations of soya bean meal and rape seed meal increased the weight of the thyroid gland and the height of the epithelium cells and significantly reduced the T4 and T3 level in the serum. Iodine supplements to the rape seed meal rations distinctly diminished the goitrogenic effect, did not, however, cancel it out. Stage of goiter and depression of consumption were--different shown by the T3 and T4 level in the serum. Highly significant relations were calculated between live weight gain, weight and the height of the epithelium cells on the one hand and the T4 level in the serum on the other. Iodine supplementations of rations without thyrostatic components should amount to greater than or equal to 0.1 mg/kg. Iodine supplementations of 0.5 mg/kg feed are at present recommended to rations with rape seed meal quotas of less than 8%.

Animal Feed↗
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[The vitamin A requirement and the vitamin A status of growing cattle. 1. Studies of calves].

Five experiments with 18 to 36 male calves each of the black and white dairy cattle breed (age: 14-21 days, initial live weight: approximately 45 kg per animal) were carried out in order to investigate the influence of various vitamin A supply (0-80,000 IU per 100 kg LW and day) on dry matter intake and weight gain as well as the vitamin A status of liver and blood plasma over 84 days. The calves consumed a diet free of carotene and vitamin A consisting of milk replacer, concentrate and chopped wheat straw. The calves were fed in three experiments for a longer time in order to observe the further vitamin A depletion. Nine animals consumed an unsupplemented ration, nine other one got 10,000 IU vitamin A per 100 kg LW and day. Biopsies of liver and plasma samples were taken from 4 animals per group every four weeks. The various vitamin A supplementation did not significantly influence the dry matter intake (Mean: 1.67; 1.48 to 1.80 kg DM per animal and day) and the weight gain of calves (Mean: 702, 599 to 770 g per animal and day). First vitamin A deficiency symptoms (reduced feed intake, decreased weight gain, diarrhoea etc.) were observed in animals of unsupplemented group after 100 days of experiments. After 84 days the vitamin A concentration of liver of animals of unsupplemented groups decreased to 1.3-32.2% compared with the begin of experiments (60.6-155.7 mumol/kg fresh matter). Up to 51% of initial concentration were found when 10,000 IU vitamin A per 100 kg LW and day were fed. About 25,000 IU vitamin A per 100 kg LW and day were required in order to keep the initial level of vitamin A concentration of liver. The plasma vitamin A concentration is unsuitable for estimation of vitamin A status of calves. The concentration of vitamin A of liver and plasma amounted to 114 mumol per kg and 0.25 mumol per litre at the begin of experiments. The vitamin A concentration of liver of unsupplemented group decreased to 20 mumol per kg, that of plasma increased to 0.28 mumol per 1 at the end. A strong vitamin A deficiency (liver concentration: less than 10 mumol/kg) may cause a decrease of vitamin A concentration of blood.

Animal Feed↗
PubMedDate not supplied

Chondroitin sulfate proteoglycan expression during neuronal development.

Proteoglycans of developing chick brain were distinguished on the basis of reactivity with four well characterized antibody reagents (S103L, to the CS-rich domain; HNK-1, to 6-sulfated glucuronic acid; 1-C-3, to the HABr region and 5-D-4, to KS chains). One chondroitin sulfate proteoglycan reacted exclusively with S103L and 1-C-3 and not with the other two antibodies, hence is designated the S103L reactive brain CSPG. The other proteoglycan reacted exclusively with HNK-1 and 5-D-4 and not with S103L and 1-C-3, hence it is designated the HNK-1 reactive brain CSPG. In addition to these immunological distinctions, the S103L and HNK-1 CSPGs exhibited significant biochemical differences at both the protein and carbohydrate levels. Most interestingly, both CSPGs were found in all regions of the brain, and were expressed in a developmentally regulated pattern. The S103L CSPG was not detectable prior to embryonic day 7, increased to a maximum at day 13-15 and declined by day 20 in most brain regions examined. In contrast, the HNK-1 CSPG was present as early as embryonic day 4 and remained constant through hatching. Neuronal cultures established from embryonic day 6 (E6) cerebral hemispheres represent an in vitro paradigm that mimics in vivo neuronal development and differentiation. In this culture system we found that the expression of the S103L and HNK-1 CSPG followed a pattern similar to that observed in developing brain and further, that neurons are probably the sole source of S103L CSPG in cerebral cortex during neuroembryogenesis.

Animals↗