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H Lüdke

Publications and source records attributed to H Lüdke.

31 records · Page 2Linked to original sources
PubMed1977

[Nickel--an essential trace element. 1. Influence of the supply of nickel on live weight gains, food consumption and body composition of growing pigs and goats].

Pigs and goats were used in long-term trials to investigate in which way supplements of 100 mug Ni per kg of a semisynthetic diet (control rations: 10 mg Ni per kg of the diet) would influence the rate of weight gains and food consumption and the body composition of the animals. A significant decline in the rate of weight increase was noted in the Ni-deficient animals. Ni-supplements added to the diet (10 mg/kg) increased the weight gains by 21% (goats) and 13% (pigs). In the present trial goats showed a more sensitive response to Ni-deficiency than pigs. Ni-deficiency did not affect the food consumption of neither the growing goats nor the growing pits. It was only during their lactation period that the Ni-deficient goats showed a statistically well-established decrease in food consumption. The level of Ni supply did not affect the crude protein, crude fat and crude ash content of the pigs.

Animal Feed↗
PubMed1975

[Trace element supply to ruminants in the German Democratic Republic. 2. Supply of copper].

The supply of copper to ruminants as influenced by and depending on the geological origin of soils was investigated in different parts of the GDR by using the hair test. Red clovers (meadow clover and field clover) were used as indicator plants. The following results were obtained: Data on the Cu content of clovers grown on soils of the same geological origin were found to correlate with r = 0,81. After eliminating the effects of Cu antagonists resulting from industrial pollution it was possible to establish numerical relations (B = 0.39 and B = 0.89) between the relative values (specific for the particular location) for the Cu content of the indicator plants and the percentage of cows suffering from Cu deficiencies (6.0 and 5.0 ppm Cu in hair). The lowest percentages of Cu supply to the ruminants (established on the basis of the Cu content of red clovers) were found on diluvial sandy soils, glacial loams and peat and bog soils whereas the highest percentages of Cu were found on weathered soils (of phyllite, gneiss, shell limestone, red marl soils and porphyry). Secondary Cu deficiencies in ruminants may arise, independent of the geological origin of the soil material, in places exposed to the main direction of the winds from major industrial areas (emission of SO2, Cd and Mo). Due to primary and/or secondary deficiencies the supply of Cu to ruminants in various locations (syenite, granite, red sandstone, gneiss, loess; peat soils, diluvial sandy soils) may be insufficient. A detailed description is given of areas where Cu deficiency is likely to occur and recommendations are given on how to use mineral mixtures containing a high proportion of Cu (1.00 g Cu per kg).

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. 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↗
PubMedDate not supplied

[The phosphorus supply of pigs in the body weight category of 11-38 kg. 1. The effect of the phosphorus supply on the performance, nutrient digestibility, protein and fat content in soft tissue and skeleton and protein and fat deposits].

The influence of phosphorus supply on performance and nutrient composition of the empty body was studied in two individual feeding experiments with two and three groups resp. (7 or 8 animals per group). The phosphorus content of the unsupplemented diet was in the experiments I and II 2.97 and 2.41 g/kg, the supplemented phosphorus (as monocalcium phosphate) amounted of 2.5 and 2.33 g/kg diet respectively. The phosphorus supplementation increased live weight gain in both experiments by 84 and 45% and improved feed conversion by 35 and 23% respectively. Phosphorus deficiency did not influence the digestibility of nutrients. The fat content of soft tissue and skeleton of the phosphorus deficient animals was increased. They deposited 0.7 kg more fat (in both experiments) and 1.5 or 0.7 kg less protein in experiment I and II respectively. The utilisation of energy for deposition was not influenced by the different phosphorus supply.

Adipose Tissue↗
PubMedDate not supplied

[The phosphorus supply of swine between 11 and 38 kg. live weight. 2. The phosphorus, calcium and ash deposit in skeletal and soft tissue homogenates during P deprivation and during the use of two different phosphate feedings and different ration conditions].

The influence of phosphorus (P) supply on the content of ash, P and Ca of the skeleton and soft tissue as well on the P deposition in the empty body of pigs (approximately 35 kg live weight) was studied in 3 individual feeding experiments with different diets (P-content 2.97, 2.41 or 3.7 g/kg diet). In each experiment 2 of the 3 groups (7 or 8 animals per group, initial weight approximately 11 kg) were supplemented with the feed grade phosphates "Rükana" or "Cefkaphos". In the experiments the supplemented amount of P as "Rükana" or "Cefkaphos" was 2.50, 2.33 or 0.5 g/kg of the diet. After intake of approximately 65 kg of the diet the animals were slaughtered. Homogenates of bones and soft tissues of the left half of the empty body were analysed for ash, P and Ca. Both of the feed grade phosphates increased these parameters in the skeleton and soft tissues as well the P deposition in the body to the same level. In the middle of the experiments the P deposition per kg live weight gain amounted to 4.6 g ("Rükana") and 4.4 g ("Cefkaphos").

Animal Feed↗