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Biomedical subjects

J Zentek

Publications and source records attributed to J Zentek.

44 records · Page 3Linked to original sources
PubMed1993

[Granulated carrots (Daucus carota) in dog nutrition].

In feeding and balance trials with dogs (4) dried, ground carrots were tested in addition (30%) to a basic dry food (rice, corn gluten, fish meal and supplements). The palatability of both mixtures was good: fecal water losses were increased after feeding the carrots. Apparent digestibilities of organic and inorganic matter, especially sodium and potassium (not phosphorus), decreased. Digestibility of carrots was calculated to reach 70% with 1.2 MJ of digestible energy per 100 g dry matter. Reduced fecal pH (6.9-->6.1), higher lactate concentrations and increasing excretion of volatile fatty acids were seen as results of the stimulated bacterial metabolism in the colon. Diurnal pattern of breath hydrogen exhalation was similar in both periods: renal excretions of phenol, indican, and nitrogen were significantly reduced after supplementation with carrots as compared to control period.

Animal Feed↗
PubMed1992

[Energy intake of adult Great Danes].

Energy intake and weight development were recorded in 5 adult Great Danes kept in outdoor kennels during maintenance, pregnancy and lactation. In periods with constant weights the energy requirement was 0.96 MJ DE/kg BW0.75/d with a minimum in summer (0.82) and a maximum in winter (1.1). In pregnancy (weight gain depending on litter size 7-15 kg) energy intake (ad-lib.-feeding) was similar to maintenance. During lactation energy intake reached 1.6-1.7 MJ DE/kg BW0.75/d with a dry matter intake of 83 g/kg BW0.75/d. Pups of great litters had to be fed with milk substitute for normal weight development.

Animal Feed↗
PubMed1992

[The effect of a different energy supply on the growth intensity and skeletal development of growing Great Danes. 2. Effect on insulin-like growth factor I and on thyroid hormones].

In an experiment with 13 growing Great Danes (littermates) fed ad libitum (4 dogs) or restrictively (70% of ad libitum energy intake; 9 dogs), concentrations of insulin-like growth factor I (IGF-I), 3,5,3'-triiodothyronine (T3) and thyroxine (T4) were measured in blood samples until the age of 6 months. In the ad libitum fed group, levels of T3 and T4 were partially and of IGF-I were significantly (p < 0.01) elevated as compared with the control dogs. Postprandial changes of IGF-I were absent in growing Great Danes as well as in a reference group of 3 adult beagles. Increased concentrations of IGF-I, T3 and T4 could be causally related to osteochondrosis, which frequently occurs in intensively fed dogs.

Animal Feed↗
PubMed1992

[The effect of a different energy supply of growing Great Danes on body weight and skeletal development. 1. Body weight development and energy requirement].

27 Great Danes (from 3 litters) were fed ad lib. (n = 9) or with an energy intake (n = 18) restricted to 80 and 70% of the paired ad lib. group, respectively, and a nearly equalized protein and nutrient supply meeting the current recommendations (8 dogs of the restricted groups were bearing weight loaded [15% of own BW] belts in the scapular region). Dogs were weighed weekly, shoulder height, approximate length of the forearm and foot were recorded in certain intervals. In plasma protein, urea, Ca, P, Cu, Zn, and alkaline phosphatase were determined. Intake of digestible energy (according to the results of digestive trials) was recorded daily.

Animal Feed↗
PubMed1991

[Cu deficiency in growing dogs].

It was the aim of the investigation to evaluate the influence of marginal (60-30 micrograms/kg BW/d) or adequate (680-360 micrograms/kg BW/d) Cu-intake on the development of growing beagles (n = 10) and the incidence of skeletal diseases. Low Cu-intake (6 dogs) reduced Cu-concentrations in plasma (1.4 vs. 9.7 mumol/l), hair (3.3-4.5 vs. 12.6-14.5 mg/kg DM), liver (19 vs. 246 mg/kg fat free DM), bile (0.28 vs. 7.04 mg/l), and other samples significantly. Hemoglobin and packed cell volume decreased after 4 months of depletion (normochromic anemia). First clinical signs of Cu-deficiency were depigmentation and greying of hair, followed by hyperextensions in the distal forelegs. After necropsy deformations of the long bones were seen more frequently in the depleted animals, without distinct alterations of the microstructure or chemical composition of bones or tendons.

Animals↗
PubMed1991

[Myopathies in a riding horse stable].

In this case report on myopathies in 6 saddle-horses, a combined dietary vitamin E and selenium deficiency is presumed. Other disorders, such as exertional myopathy ("Monday morning disease") due to excessive energy intake or ionophore intoxication could be excluded by calculating the energy supply or by a simple colour test. The selenium requirement of horses is estimated to 0.1-0.2 mg/kg dry matter (Meyer 1986). If natural feed compounds are low in selenium, adequate amounts of this trace element can be supplied by means of supplemental feeds, sodium selenite (20 mg/500 kg BW/week) or bruised linseed (cooked, 200-500 g/d). In horses tolerance of increased selenium intake is low. After oral administration of sodium selenite lethal dose was 3.3 mg/kg bodyweight. In feedstuffs selenium concentration must be below 5 mg/kg dry matter (Traub-Dargatz et al, 1986). The intake of vitamin E should be 0.25-1 mg/kg bodyweight. The requirements are influenced by feed compounds, especially the concentration of dietary unsaturated fatty acids, and the performance of the horses (Meyer 1986). Foals, pregnant or lactating mares, and racing horses have higher requirements. In acute disease vitamin E and selenium are given parenterally (5 mg Se/horse) or by oral application of sodium selenite (46% selenium, 20 mg/horse), in addition to symptomatical treatment.

Animal Feed↗