[Recent developments in milk production and the occurrence of pathogens in milk and dairy products (author's transl)].
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Animals↗
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Influence of milk products on fluoride bioavailability in man.
The effect of milk products on the gastrointestinal absorption of fluoride from sodium fluoride tablets was studied in five healthy subjects. Two different diets were tested: (1) 250 ml standardized milk (3% fat) and (2) 500 ml of milk, 3 pieces of white bread with cheese and 150 ml of yoghurt. The 100% bioavailability of sodium fluoride tablets during fasting was greatly decreased by coadministration of milk products: with Diet 1 the absolute bioavailability calculated from combined plasma and urine data was in the range 50--79% and with Diet 2 it ranged from 50--71%. It is suggested that the decreased bioavailability produced by dairy products should be taken into account when establishing flouride dosage regimens for prophylaxis of caries.
Adult↗
Seasonal effects of tropical climate on shaded and nonshaded cows as measured by rectal temperature, adrenal cortex hormones, thyroid hormone, and milk production.
Rectal temperatures and hormone concentrations were monitored at intervals of 2 to 3 weeks, and milk, milk fat, and California mastitis test scores at intervals of 1 week in five shaded and in four nonshaded early lactation cows. Measurements were taken from September to December in the mildly heat stressing climate of Oahu, Hawaii. The daily ambient temperature flux ranged from 22 C to 29 C in September to 20 C to 25 C in December. Average daily temperature-humidity index (THI) values were 75 to 70 for September and December, respectively. Average daily THI values were correlated with rectal temperatures in nonshaded cows and were negatively correlated with plasma adrenal cortex hormones (corticoids) in shaded cows, plasma thyroid hormone in shaded and nonshaded cows, and with milk production in nonshaded cows. Estimated milk production decline per unit increase in THI was 0.32 kg. Nonshaded cows had higher rectal temperatures, a trend for lower plasma corticoids, produced less milk and milk fat, and had higher California mastitis test scores. Shaded cows maintained a higher fat percentage at THI above 74. Average plasma thyroid hormone values were not different between treatment groups. Both groups failed to attain normal rectal temperatures at night. Afternoon rectal temperatures were more highly correlated with the rectal temperature with which the cow started the day than they were with the THI of the day itself.
Adrenal Cortex Hormones↗
New approaches to the pathogenesis of peptic ulcer based on the protective action of saliva with special reference to roughage, vegetable fibre and fermented milk products.
Epidemiologic studies have shown differences in the prevalence of peptic ulcer disease among various communities to be related to variation in diet and eating patterns. Results of studies of the effect of diet and pattern of eating on saliva, on gastric juice, and on the amount of bile are reviewed. It is suggested that bile, and not hydrochloric acid, plays the causative role in pathogenesis of peptic ulceration. The role of saliva in the prevention of peptic ulcer is emphasized. The salivary mucus swallowed with food is protective because it decreases the flow rate of bile which, when held in the gall bladder longer, loses its alkalinity and therefore its ability to damage the mucous cells. Roughage, cellulose and vegetable fibres and fermented milk products act in a similar manner. When food is well masticated, containing plenty of vegetable fibres and fermented milk products such as ghee and yoghurt, resulting in an increase in the amount of salivary mucus, peptic ulceration may be prevented and cured and relapses may be prevented. This does not require a big change in the pattern of diet but only a change in the manner of eating so that hasty eating is avoided and good is chewed well. The pattern of diet, especially the relative dietary preponderance of short-chain fatty acids, such as those present in milk, yoghurt and other fermented milk products, have a protective action; the short-chain fatty acids retard gall bladder contraction and thus diminish the amount of bile entering the duodenal lumen.
Bile↗
[Residue situation of milk products after the effective carrying out of the "step-by-step program for DDT-replacement" in the GDR].
A step-by-step program had been established to replace the persistent insecticide DDT with other active principles in the GDR by 1975. Monthly thin-layer chromatographic residue determinations in butter samples from all the districts demonstrate that the DDT-residues have decreased gradually since 1973 from an average value of 0.45 mg/kg to an average value of 0.18 mg/kg (in 1976). The DDT intake of adults via the milk products (butter, milk and cheese) was, in 1976, only 2% of the ADI value, which evidences a very positive development. Furthermore, findings concerning the contamination with lindane and HCB are presented.
Animals↗
Influence of dietary protein concentration on milk production by dairy cattle during early lactation.
In a 3 X 2 factorial experiment 75 Holstein cows in first, second, or third lactation were fed rations containing either 12.2% or 16.2% crude protein in total ration dry matter. On the average, 26% of dry matter intake was from corn silage, 22% from alfalfa-grass hay, and 52% from a grain mix. Protein was controlled by feeding a 13.7% crude protein grain mix with 1.4% urea for the 12% ration and a 19.8% crude protein grain mix with natural protein for the 16% ration. Average daily milk production (kg/day) for wk 2 through 12 of lactation for 12% and 16% rations by lactations were: first, 21.6 and 21.9; second, 25.7 and 31.5; and third, 27.5 and 34.0. Dry matter intakes by lactations were .42, 1.18, and 2.05 kg/day higher for cows fed the high protein compared to low protein rations. Milk composition was not influenced by protein treatment. The markedly different response to protein supplementation in milk production between heifers in first lactation and more mature cows is unexplained.
Aging↗
Endocrine factors in genetic improvement of milk production.
The endocrine role in lactation is undisputed, but attempts to correlate milk production with various endocrine products have had limited success. Recent work has suggested that placental hormones, in particular placental lactogen, may be an important regulator of lactation capacity. In addition to concentrations of hormones in blood, it is important to consider receptors in target tissue for the hormones. The concentration of receptors in a tissue may vary with genotype of the individual or under the influence of hormonal state. Other aspects of the target tissue's system for response also must be considered.
Animals↗
Organochlorine insecticide residues in bovine milk and manufactured milk products in Illinois, 1971-76.
Monitoring activities were initiated in 1971 to survey the occurence and levels of organochlorine insecticide residues in bovine milk and manufactured milk products in Illinois. Dieldrin residues were the most prevalent, and were found in 96 percent of the samples. Dieldrin also accounted for the highest average residue concentration (0.09 ppm). Only 0.3% of the samples contained illegal insecticide residues. Levels of DDT and lindane were generally declining, but those for dieldrin and heptachlor epoxide tended to remain constant.
Acetonitriles↗
[Hydrolyzed lactose contained in the ultrafiltrate of milk or milk products in an enzymatic membrane reactor].
Milk and milk by-products with a low lactose content, very interesting from a nutritional and technological point of view, were obtained by the application of the enzymatic membrane reactor technique. A previous separation of the aqueous phase of milk or ultrafiltrate was necessary and realized by ultrafiltration. The enzyme, a commercial beta-galactosidase, was maintained in solution in the retentate part of the membrane reactor. The optimal conditions of the lactose hydrolysis in milk and whey ultrafiltrates were determined. The behaviour of the aqueous phase of milk in membrane reactor, specially of mineral salts, was studied. Three possibilities were proposed to avoid a calcium-phosphate deposit on the surface of (and in) the reactor membranes: a precipitation of calcium salts by heating, a partial demineralization by electrodialysis or ion exchange, a calcium complexation by addition of sodium citrate. A continuous process for the lactose hydrolysis of milk and demineralized whey or milk ultrafiltrate was proposed. The organoleptic quality of low lactose milk, before and after heat treatment, was evaluated by a tasting panel. High sweeting syrup, were obtained by concentration of lactose hydrolyzed and demineralized ultrafiltrates. Nutritional aspects of these products are discussed specially from the toxicological point of view of galactose.
Animals↗
Utilization of dietary energy for maintenance, milk production and lipogenesis by lactating crossbred cows during their midstage of lactation.
1. Twenty-four energy and nitrogen balances were determined using twenty-four crossbred cows (Brown Swiss X Sahiwal) during their midstage of lactation. Energy balances were estimated by subtracting milk energy and heat production from the metabolizable energy (ME) intake. Heat production was estimated by indirect calorimetry, by collection and analysis of respiratory gases. The cows were given amounts corresponding to 90, 110 and 130% of the ME and 90 and 110% of the digestible crude protein (DCP) standards of the (US) National Research Council (1966). 2. Energy requirements were estimated by partitioning the ME intake for maintenance, milk production and energy gain or loss by multiple regression of energy balance values. Heat production (and thus energy balance) was corrected for excess N intake. 3. Energy requirements for maintenance were 585-18, 580-17 and 574-41 kJ ME/kg body-weight0.75 per d for cows in negative balance, cows in positive balance and for all cows, respectively. 4. The efficiency of utilization of ME for milk production was 68-52, 65-48 and 66-12% respectively, for cows in negative balance, for cows in positive balance and all cows. Energy required per kg fat-corrected milk production was 4-580, 4-791 and 4-746 MJ ME for the respective groups of cows. 5. The efficiency of utilization of ME for tissue gain was 67-67 and 64-86% for cows in positive balance and for all cows respectively.
Animals↗
Effects of gastrointestinal nematodiasis on the productivity of monozygous twin cattle. II. Growth performance and milk production.
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Animals↗
[Effect of hypodermyiasis in cattle on milk-production indicators in 1st-calvers].
We investigated the effect of hypodermosis on the quantitative and some qualitative indicators of milk from 20 experimental and 18 control first-calvers of the Pinzgau cattle breed. The experiment took place at two experimental localities in mountainous pastures of the Central-Slovakian region. In the experimental animals, treated with Hypocid, the production of milk per dairy cow increased on an average by 115.98 kg, i.e. 24.83%, over the experimental period of 61 days (May, June) with an average invasion intensity of 5.94 larvas in control animals. Milk fat production increased on an average by 7.20 kg, i.e. 34.97%. Production recalculated to FCM milk amounted on an average to 31.61%. The profitability of treating hypodermosis with the Hypocid preparation is expressed by the average savings of 0.40 Kcs per litre of milk per day.
Animals↗
Effects of polybrominated biphenyl on milk production, reproduction, and health problems in Holstein cows.
PBB found in relatively low levels among animals present on a cross-section of Michigan farms during the time PBB was inadvertantly added to dairy feeds had no effect upon these animals' milk production, body weight, weight gain, breeding and reproduction performance, incidence of commonly experienced health problems, calving rate, and the health of their calves. No significant differences in these vital areas could be seen between Michigan animals exposed to PBB and equivalent Wisconsin animals which had not been exposed to PBB when both groups were subjected to equivalent management practices. No pattern of gross of histopathological lesions was seen upon necropsy between test animals and control animals.
Age Factors↗
A material with opioid activity in bovine milk and milk products.
Chloroform-methanol extracts of lyophilized milk, of commercially available dried milk or baby food and of casein digests were tested for opioid activity on the guinea-pig ileum longitudinal muscle-myenteric plexus preparation. Compounds with opioid activity--which proved to be resistant to peptidases--were detected in certain batches of baby food, casein digest, and cow milk in considerably varying amounts.
Animals↗
Milk production increase following treatment of Dutch dairy cattle with thiabendazole.
In a trial involving 542 dairy cattle on 28 farms, 276 were treated once with thiabendazole within two days of calving. The treated group showed an average increase in milk yielded over the non-return group of 229.8 kg during the subsequent lactation. In the treated group, total milk fat production was increased over that of the controls by 7.4 kg per cow; milk protein was increased by 6.9 kg per cow. All treatment parameter differences were highly significant at the 1% level of probability.
Animals↗
The effect of oestrus on milk production in cows.
The rectal temperatures, pulse rates and milk yields of 44 Ayrshire and 38 Friesian cows were recorded during oestrus and compared with values obtained after oestrus had ceased. The fat, solids-non-fat (SNF) and protein percentages and the cell counts of milk samples were also compared. Forty of the cows were housed in cubicles and 42 were kept loose in yards. During oestrus rectal temperatures and pulse rates were significantly raised and milk yields were lowered. Milk had, on average, significantly higher fat contents and cell counts and lower SNF and protein contents than post-oestrous milk. The differences due to oestrus between the cows kept in cubicles and yards were minimal, but the Ayrshire cows tended to show more significant effects than the Friesians, except in the milk cell counts, where the difference was higher in the Friesians.
Animals↗
The effects of visiting parties on milk production in cows.
Observations were made at the evening milkings on the day before and immediately after 131 cows housed and milked in cowsheds had been disturbed by parties of visitors. The cows were divided into three groups according to the extent of the reduction in milk yield following the visits. In the two groups showing the greatest differences the disturbances significantly reduced the fat and solids-not-fat (SNF) percentages and raised the milk cell counts.
Animals↗
Titrimetric studies on milk and milk products.
Potentiometric acid-base titration is a simple method that can be used successfully in the investigation of the protein system of milk and other protein-containing products. Its applications include the examination of conventional heating procedures, cheese ripening, the investigation of processed cheese and the effect of melting salts. The principle depends on the performance of pH-dependent phase transitions which are recorded by a single titration cycle and evaluated quantitatively by means of hysteresis loops.
Animals↗