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Biomedical subjects

A Hennig

Publications and source records attributed to A Hennig.

At least 91 records · Page 5Linked to original sources
PubMed1981

[Effect of contraceptives on the digestibility of dietary protein and nitrogen balance].

The present paper deals with the effects of the hormonal contraceptives Deposiston and Gravistat on the digestibility of dietary crude protein and on the urine excretion of nitrogen. The substances under test were given to nine women aged between 18 and 25 years. The faecal and the urinary nitrogen were determined in the first two cycles during which no contraceptives were used, and also in the subsequent three cycles during which Deposiston and Gravistat were taken by mouth. The preperiod extended over 3 days; and the sampling period, over 4 days. The apparent digestibility of the dietary protein was but slightly increased by the contraceptives. In case of Deposiston for example, it amounted to 85.0% (1st cycle), 86.0% (2nd cycle), 87.3% (3rd cycle), 87.1% (4th cycle), and 88.2% (5th cycle). Deposiston and Gravistat did not affect the urine excretion of nitrogen and the nitrogen balance.

Adolescent↗
PubMed1981

[Vitamin A requirement of fattening turkeys. 1. Vitamin A requirement of fattening turkeys under conditions of intensive rearing on the ground].

In two experiments with a total of 2,250 fattening turkeys at VEB KIM Turkey and Goose Production Gühlen-Glienicke graded doses of vitamin A (0...20,000 I.U./kg feed) in a ration type poor in vitamin A and carotene were tested in dependence on sex. After a 20-day depletion period the vitamin A supplement of 0, 125 and 250 I.U.vitamin A/kg feed resulted in vitamin A deficiency symptoms after feeding this ration for 1 week. A supplement of between 500 and 1,000 I.U. vitamin A/kg feed diminished consumption in some cases significantly. On the basis of parameters of the fattening performance and of the vitamin A content of the liver it could be proved that the optimal growth of the male and female animals requires approximately 2,000 I.U. and the adequate storage of vitamin A in the liver approximately 5,000 I.U./kg feed. The requirements are fulfilled by the current supplements of the mixed feed for fattening turkeys kept intensively on the ground.

Adipose Tissue↗
PubMed1981

[Iodine metabolism. 2. Effect of iodine deficiency on reproduction and the development of progeny of goats and miniature pigs].

The influence of J-deficiency on reproduction was tested in model experiments with goats and mini pigs, partly through several reproduction cycles including the descendants after intra-uterine depletion as well. The effect of 0.05 mg J/kg dry matter in the concentrated feed (total ration 0.03)--0.04 mg J/kg dry matter) for goats was a diminished success of first inseminations, a higher frequency of abortions, high mortality and poorer development of the kids. All J-deficiency goats and kids suffered from hypertrophy of the thyroid gland, half of all J-deficiency kids were born hairless. Concerning the mini pigs, 0.06 mg J/kg dry matter even after intra-uterine depletion had no detectable influence either on conception or the mortality and development of the piglets. The thyroid gland of all deficiency pigs was enlarged, however. The hypertrophy of the thyroid gland makes it easy to diagnose J-deficiency visually.

Abortion, Spontaneous↗
PubMed1980

[Investigation of iodine metabolism. 1. The influence of iodine deficiency of the feed consumption and the development of the live weight of goats and dwarf pigs].

With goats and dwarf pigs two experiments were made with semi-synthetic rations. The influence of insufficient (0.05 resp. 0.06 ppm) and sufficient (0.42 resp. 0.56 ppm) supply with iodine on feed consumption and the development of the live weight during the growth period and gestation was investigated. While iodine deficiency resulted in diminished feed consumption and a growth depression of the goats, a negative influence on feed consumption and the live weight increase of the dwarf pigs could not be detected, feed expenditure per kg weight increase, however, was distinctly higher.

Animals↗
PubMed1980

[Requirements of turkeys kept on the ground with respect to energy and crude protein content of mixed feeds].

In four experiments with 9,500 turkeys assorted according to sex, three energy levels (500, 550 and 600 EFh (energetic feed units for hens = 14,6 kJ net energy body fat of hens)/kg feed) were combined with three levels of crude protein (250, 300 and 350 g/kg feed) in the mixed feed (9 rations) and tested under conditions of keeping the turkeys on the ground from hatching to their 42nd day of life. The feed consumption of the turkeys did not correlate with the energy content of the mixed feed. The energy consumption of the groups whose mixed feed had a high energy content (550 and 600 EFh) was significantly higher than that of groups whose feed had a low energy content. With the increasing content of crude protein in the mixed feed the consumption of crude protein per turkey and test period rose significantly. Due to the increase of the content of energy and crude protein, the live weight gain increased after a 28- and 42-day test period; the growth-stimulating effect was more distinct with male animals. Mortality had no connections with nutrition. For the starting-off feed for turkeys an energy content of < 580 EFh with 300 g crude protein per kg mixed feed up to the 4th/5th week of life is recommended.

Animal Feed↗
PubMed1979

[Utilization of 15N-labelled urea by laying hens. 1. Survey of the literature, 15N-excretion in feces and urine].

Three colostomated leghorn hybrids with an average laying performance of 75% received a ration with 17.7% crude protein and an energy content of 519 energetic feed units for hens per kg mixed feed over a period of 8 days. In the first six days of the experiment the 1%-supplement of urea to the ration was labelled. Its atom-% 15N excess (15N') amounted to 96.06%. During the last two days the urea supplement was not labelled. The total N, trichloracetic acid (TCA)-soluble N and the ammonia N were determined in the feces samples collected daily. In the urine samples collected daily the total N, urea N and ammonia N per hen were determined as well. In all samples the atom-% 15N excess (15N') was measured. The percentage of 14N in feces of the 14N dose was, on an average of the three hens, 21.3% and the analogous quota of 15N' 4.6%. The quota of ammonia 14N of the total 14N in feces had an average of 2.5%, the corresponding 15N' quota was 10.1%. The atom-% 15N' of the urea N in urine was considerably above that of the total urine N and had a maximum of more than 50%. The quota of urine 14N of the 14N taken in had an average of 44.4%, and the corresponding 15N' quota was 56.9%. On an average of the three hens, 61.6% of the 15N' were excreted in feces and urine during the 8-day test period.

Ammonia↗
PubMed1979

[Effect of native crude fiber on the digestibility of amino acids of laying hens of the fattening species].

One-year-old colostomised laying hens of the fattening species received 120 g of a basic ration approximately meeting their requirements (control group) and the animals of the test group 10, 20, 30 resp. 40 g wheat straw meal in addition. Straw meal admixtures of up to 30 g had no drastic influence on the apparent digestibility of amino acids. 40 g straw meal in the ration increased the excretion of the essential amino acids by 19% and of the non-essential ones (particularly glycine, zystine and serine) by 39% in comparison with the basic ration. The amount of free amino acids and of peptide in feces was significantly lower when the ration contained 20 g straw meal. On an average of the five variants checked, the amount of amino acid nitrogen soluble in TCA in the total-N in feces was 12%. Due to the partial digestion of the amino acids of the straw meal and the favourable influence of 10...20% straw meal in the ration on absorption, 2...3% additional nitrogen in the form of essential and non-essential amino acids was available to the hens in this range of admixture according to the analysis of feces.

Amino Acids↗
PubMed1979

[Investigations concerning the use of the rumen fermentation regulator monensin in feeding fattening bulls].

In two digestion experiments with wethers and seven feeding experiments with 198 fattening bulls with rations rich in (greater than 55% of the dry matter intake from roughage), the influence of the antibiotic monensin on the digestibility of the ration, on rumen-physiologic characteristic values and on fattening and slaughtering results was investigated. The digestibility of the organic matter and the crude nutrients was not significantly influenced by the use of monensin (20 mg/kg dry matter). The administration of 200 mg monensin per fattening bull and day resulted in an increase of the molar concentration of propionate in the rumen fluid by 9.7 mol%, the concentration of acetate and butyrate decreased by 7.3 resp. 2.8 mol %. On an average of the seven experiments the intake of dry matter was diminished by 5.1% through the use of monensin, the live weight increase remained almost unaffected (3.0% additional increase), feed and energy requirement per kg live weight were improved by 7.9%. The fattening results do not always correspond in the various experiments. The results of the dressing of the carcass, the composition of the carcass and the quality of the meat remained unaffected by the administration of monensin.

Animal Nutritional Physiological Phenomena↗
PubMed1979

[Metabolism of colostomized laying hens with 15N-labeled wheat. 2. Incorporation of the labeled nitrogen into fractions of the egg].

The colostomised hens received 15N-labelled wheat. For a period of 8 days the incorporation of the 15N excess (15N') into the albumen, the yolk and the egg-shell was measured. In addition to that, the values for atom-percent of 15N' in the amino acids lysine, histidien and arginine of the albumen and the yolk were ascertained. The egg-shell and the albumen were labelled shortly after the beginning of the experiment. In both fractions the atom-per cent of 15N' rises more quickly than in the yolk. After the withdrawal of the labelled feed the decrease in the yolk was slower than in the egg-shell and the albumen. Concerning the atom-per cent of 15N' there is hardly a difference between the total N and the amino acids. Despite the different supply with amino acids, the relation of histidine 15N' : lysine 15N' : arginine-15N' in the yolk and the albumen remains largely constant. It is 1 : 2 : 3 and corresponds to the quantitative relation of the N content of the three amino acids in the egg protein. The utilisation of 14N and 15N' of the wheat lysin for the egg synthesis amounts to approximately 50%. There are considerable differences between the utilisation of 15N' of the histidine and 15N' of the arginine and the 14N of the two dietary amino acids.

Amino Acids↗
PubMed1979

[The supply of wild ruminants with major and trace elements. 1. The cadmium content of winter grazing and the cadmium status of red deer, fallow deer, roes and moulons].

The Cd-determination of 10 different winter grazings for wild ruminants in seven different biotopes showed significant differences of the habitats resulting from the previous Cd-emission of metallurgy smelting non-ferrous metals. The winter grazing of the Tharandt Forest and the Harz mountains contained significantly more Cd than that of the Lower Flaming hills, the western Erzgebirge and the northern agrarian areas. The bark and the tips of conifer twigs, twigs of oak and mountain ash, bilberry and heather plants, i. e. perennial plants resp. parts of plants proved to be particularly rich in Cd. On an average, wild ruminants consume more Cd than domesticated ruminants, which do not consume parts of perennial plants. The rumen contents of all wild ruminants contained, with 0.20 to 0.25 mg/kg dry matter more Cd than could be expected from the content of the grazing. In the Cd-contaminated areas the amount of Cd in the rumen contents too showed the Cd-load. The kidneys, livers and the covering hair of a total of 172 head red deer, roes and mouflons reflected the Cd-load and the dependence of the Cd-level on the age. The Cd-concentration ascertained in the organs of the wild ruminants was compared with that of sheep and cattle. The, on an average, higher Cd-load of the wild ruminants was confirmed. The kidneys of wild ruminants older than five years should, as a general principle, not be eaten and neither should the livers of animals from Cd-contaminated biotopes. The limb defects of mouflons from Cd-contaminated areas are discussed in connection with Cd-induced secondary Cu-deficiency resp. Mn- and Zn-deficiency. A reference is made to further works.

Animal Nutritional Physiological Phenomena↗
PubMed1978

[Effect of endogenous factors on ash, calcium, magnesium, potassium, sodium, phosphorus, zink, iron, copper and manganese concentration in the pig bristle. 6. Effect of gender on mineral composition of pig bristle].

Sex-specific hormones were found to influence the bristle's mineral content. The bristles of female (N=151) and male (N=152), 42-day old piglets did not differ in the proportion of the elements under study (P greater than 0.05). The bristles of 36 female and 36 male castrated fattening pigs in the 40-110 kg weight range did not reveal significant differences either (P greater than 0.05). The bristles of sows and boars showed differences in the contents of ash, Mg, K, Na, P, Zn and Mn (P greater than 0.05) as well as in the contents of Fe (P greater than 0.01) and Cu (P greater than 0.05). The difference for the Ca-content could not be statistically secured (P greater than 0.05). The content of the bristle or hair of sexually mature animals in certain elements is influenced by sex hormones and should be regarded as a secondary sexual characteristic.

Animals↗
PubMed1978

[Excessive iron administration to sheep. 2. The effect on the iron, copper, zinc and manganese level in different organs].

Lambs received 250, 1000 and 1750 mg Fe per kg concentrate dry matter. The Fe-supplementations caused the Fe-levels of spleen, liver, kidneys and ribs to rise significantly. Liver and spleen reflected most markedly the high Fe-supply. The Fe-supplementation reduced the Cu-content in the liver and the share of Zn in the kidneys. The Mn-content of all body parts analysed was not significantly influenced by Fe-supplementation.

Animals↗
PubMed1978

[Studies on the vitamin requirement and vitamin supply in fattening turkeys. 2. Checking the vitamin supplements to state-approved mixed animal feed for fattening turkeys].

In turkey fattening experiments, the vitamin A, vitamin D3, vitamin B6, vitamin B12, niacine, pantothenic acid, folic acid, biotine and choline chloride additions to mixed feeds for fattening turkeys were checked. The vitamin A requirement of the fattening turkey is met, in all stages of growth, by adding 3,000 I.U./kg feed. For vitamin D3 the necessary supplements are 1,000 and 500 I.U./kg for starter feed and fattening mixes, respectively. The requirements for vitamins B2, B6, B12, niacine, pantothenic acid, folic acid and biotine of the fattening turkey are covered by the respective amounts contained in the ration components. To ensure adequate choline supply (optimum gain, small losses) during the starter period, the addition of 500 mg/kg feed proved necessary. On the basis of the results presented, recommendations are given for requirement norms and mixed feed supplementation that have been fully implemented in the meantime.

Animal Feed↗
PubMed1977

[The vitamin B 6 requirements of the laying hen for reproduction].

A total of 1125 hens were used in 3 feeding and 20 hatching trials. The trials were performed to investigate the influence of different vitamin B6 levels on the reproduction characteristics of the hens (fertilization of eggs, hatchability of the chicks, development of progeny). The vitamin B6 requirements of the hens were fairly low for maintaining normal fertilization and hatching rates (approximately 1.5-2 mg per kg of feed). Chicks reared on low vitamin B6 diets (0-12 days) showed definitely improved rearing characteristics (Food consumption, liveweight gains, losses) if the diet of the hens had been supplemented with graded amounts of vitamin B6. These findings were, in the first instance, due to an increased rate of vitamin B6 deposition in the liver and in the yolk sac of the newly hatched chicks (vitamin B6 reserves), apart from the fact that the overall vitamin B6 content of the egg remained largely unchanged. Variations in the vitamin B6 reserves, on the other hand, did not exert any influence on the development of progeny if the chicks received adequate amounts of vitamin B6.

Animal Feed↗