Wyniki wyszukiwania - AGRO

1

Factors affecting somatic cell count and total microorganisms count in cow's milk

100%

Skrzypek R.

Polish Journal of Food and Nutrition Sciences

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2006

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tom 15/56

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nr Spec.Issue 1

The aim of this study was to analyse the effects of environmental factors on somatic cell count (SCC) and total microorganisms count (TMC) in cow bulk tank milk. The investigations were carried out in 2003 in 200 farms, situated in the Wielkopolska region. In the period from May to September, higher levels of SCC and TMC in milk were observed than in the other months. The average number of cows in the herd was positively correlated (i.e. disadvantageously) with the level of SCC. The following management and technological factors decreased both the level of SCC and TMC: keeping cows without pigs in the same farm, pre-milking udder and teat cleaning with a dry towel, use of antibiotics at cow dry-off, individual registration of the cases of clinical mastitis, antibiotic treatment of all cows with the clinical manifestation of mastitis, and pre-treatment performing of antibiogrammes in mastitic cows. Furthermore, a decreased level of SCC was associated with the following factors: use of cow-runs in the summer season, use of California Mastitis Test, and use of concentrates in the amount greater than 4 kg per cow/day. A decreased level of TMC was observed in the herds in which cow-runs were not used in the winter season, pipe-line system of milking was used, milking cluster was stored between milkings dry or it was dipped in the water containing a disinfectant, disinfection of all stalls for cows was performed at least once per year, and sugar beet leaves were not used in cow feeding.

2

Udder conformation and housing system as related to somatic cell count in cow's milk

88%

Wojcik P.

Journal of Animal and Feed Sciences

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2007

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tom 16

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nr 2

180-192

3

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Computational repurposing of FDA-approved drugs against specific mastitis-causing pathogens

88%

Ghafoor N. A., Sitkowska B.

Acta Scientiarum Polonorum. Zootechnica

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2021

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tom 20

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nr 4

4

Effect of technological modification on the immunoreactive and allergenic properties of cow milk proteins

88%

Wroblewska B.

Polish Journal of Food and Nutrition Sciences

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2011

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tom 61

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nr Suppl.1

5

Fluorine in milk

88%

Pasternak K., Majdanik S., Papierkowski A.

Polish Journal of Environmental Studies

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1998

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tom 07

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nr 4

The experiment was conducted in order to determine the concentration of fluorine in cow's milk and human breast milk. Milk samples were tested for fluoride concentration. After fractioning, free fluorine and protein-bound fluorine was tested by using ion-selective electrode. It was determined that the concentration of fluorine in tested human breast milk was higher than in cow's milk. The fluorine appeared mainly in free form and only a small fraction was bound to proteins. Complete concentration of fluorine was higher in human breast milk than in cow's milk.

6

Polychlorinated biphenyls in human milk, UHT cow's milk and infant formulas

88%

Pietrzak-Fiecko R., Smoczynska K., Smoczynski S. S.

Polish Journal of Environmental Studies

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2005

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tom 14

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nr 2

The content of polychlorinated biphenyls was determined in human milk collected from four regions of Poland, as well as in cow’s milk and infant formulas. Significant statistical differences in PCB levels were determined in human milk depending on the region. The highest PCB mean concentration (0.351 mg. kg⁻¹ milk fat) was determined in human milk from Gdańsk. An average of 0.218 mg PCB kg⁻¹ milk fat was determined in human milk, 6 and 17 times higher than cow’s milk and infant formulas, respectively. Higher (37%) content of PCB was found in the milk of women living in rural regions.

7

Levels of residual nitrates and nitrites in milk in 1996

88%

Baranova M., Burdova O., Mal'a P., Zezula I.

Bulletin of the Veterinary Institute in Puławy

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1998

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tom 42

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nr 2

Levels of nitrates and nitrites were observed in pooled samples of milk from selected suppliers of the Košice dairy, and in dairy treated milk during certain months of the year. The average value of nitrates in examined (432) pooled samples of milk ranged from 1.84 to 4.58 mg of NaNO₃.1⁻¹, and in dairy-treated milk (72 samples), from 2.33 to 6.23 mg of NaNO₃.1⁻¹. In the both cases maximal values of nitrates were observed in April, and minimal values in January. With the exception of one pooled sample, all the examined milk samples complied with the Slovak Codex Alimentarius, where the highest values of nitrates and nitrites in some of the final products are fixed. The average value of nitrites in the examined samples of milk taken during the investigated period, amounted to 0.07 mg of NaNO₂.1⁻¹.

8

Milk proteins of Jersey cows

75%

Antkowiak I., Pytlewski J.

Animal Science. Scientific Papers of Agricultural University of Poznan

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2003

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tom 05

The examined population of Jersey cows was characterised by the occurrence of three genotypes of the casein protein fraction and four genotypes of whey protein.

9

Relationships between milk beta-carotene concentrations and the cytological quality of cow's milk

75%

Kuczynska B., Kapusta A., Puppel K., Nalecz-Tarwacka T., Budzinski A., Golebiewski M., Czub M., Grodzki H.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2015

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tom 54[1]

Relationships between milk β-carotene concentrations and the cytological quality of cow’s milk. The objective of the study was to describe the relationship between milk β-carotene concentration and the cytological quality of milk of high yielding cows. The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences (WULS). From a herd of 320 Polish Holstein Friesian cows maintained in a free–stall dairy shed 58 cows were selected taking into consideration the stage of lactation (15±14 days). Cows were fed a total mixed ration (TMR) diet provided ad libitum. Four groups of cows taking into consideration concentration of β–carotene in milk has been created: 1) <150 mg L-1; 2) 151-250 mg L-1; 3) 251-450 mg L-1; 4) > 450 mg L-1. The content of β–carotene and SCC amounted at the herd level: 192 tys ml-1 and 0.312 mgL -1 respectively. The β–carotene content ranged from 0.150 to 0.451 mgL-1. The highest content of β–carotene, 0.451 mgL-1, was found in milk of cows with the lowest level of somatic cells count (SCC). The lowest level, 0.150 mgL-1, was found in milk of cows with the highest level of SCC. Milk SCC varies significantly with the concentration of β-carotene in cow’s milk. Researchers should consider monitoring for this variable as potential cofounder when exploring the relationship between mastitis, intramammary infection and nutritional management.

10

Wpływ częstości doju na wydajność i skład mleka krów za pierwsze 100 dni laktacji

75%

Weglarzy K., Bereza M., Szarek J.

Prace i Materiały Zootechniczne

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2009

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tom 67

11

Determination of magnesium and ather bioelements in cow's milk

75%

Birghila S., Dobrinas S., Popescu V., Bratu M. M.

Journal of Elementology

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2005

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tom 10

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nr 4 Suppl.1

19

12

Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow's milk during grazing season

75%

Kuczynska B., Puppel K., Nalecz-Tarwacka T., Czub M.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2015

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tom 54[1]

Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow's milk during grazing season. The aim of this study was to determine variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow's milk during the grazing season. The study was carried out in 10 certified organic farms The major criterions of choosing organic farms to the experiment were as follows: obtaining certificate for at least 5 years and abidance of the organic farming standards, possessing a herd of Black and White Polish Holstein-Friesian cows (numbering more than 30 cow. The highest concentrations of CLA cis9, trans11 isomer, TVA and LA in milk fat has been reported in June, slightly lower in July and August. While the lowest level has been recorded in May, at the beginning of grazing period. Significant correlations between MUFA and SCD (r2= 0.828 p<0.01) has been recorded. We concluded, that monitoring of SCD activity can be used as a tool to achieve high unsaturation of milk fat, during grazing period.

13

Influence of an iodine depletion period and teat dipping on the iodine concentration in serum and milk of cows

75%

Flachowsky G., Schone F., Leiterer M., Bemmann D., Spolders M., Lebzien P.

Journal of Animal and Feed Sciences

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2007

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tom 16

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nr 1

18-25

14

Changes in cow’s milk composition and physical properties during the uninterrupted milking process

75%

Dymnicki E., Golebiewski M., Wojcik A., Puppel K., Kuczynska B., Sosin-Bzducha E., Szulc T.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2015

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tom 54[1]

Changes in cow’s milk composition and physical properties during the uninterrupted milking process. The chemical composition of milk determines the nutritional value and technological properties of milk and dairy products. Many studies have been performed on the chemical composition of milk, including fatty acid and protein profile, however a limited number of investigations have determined the changes in chemical composition of the milk during the milking process. Experiment were designed to study changes in milk chemical composition (i.e. fat, protein, casein, lactose, urea, citric acid, Total Solids (TS), Solids-Non-Fat (SNF), free fatty acids (FFA) as well as acidity, density, freezing point and somatic cell score) during the uninterrupted milking. Fifty two (455 samples) cows of 3 different breeds; with daily production 5-12 kg; were sampled during interrupted milking process. Representative sample were collected from each kg of milked liquid. There were significant (P≤0.01) changes in fat, FFA, lactose, TS and density of milk during milking. The concentration of fat, FFA, and TS shown increasing tendency with the course of milking, however, lactose and density presented opposite trends. Therefore, obtaining the whole quantity of milk from udder during the milking process, beside shaping the health status, is an indispensable step to produce milk of the highest quality in terms of its nutritional and technological value.

15

Long-term profitability of cow milk production

75%

Okularczyk S.

Annals of Animal Science

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2004

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tom 04

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nr 1

16

Technological usefulness of milk of cows of six breeds maintained in Poland relative to a lactation phase

75%

Barlowska J., Litwinczuk Z., Krol J., Topyla B.

Polish Journal of Food and Nutrition Sciences

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2006

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tom 15/56

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nr Spec.Issue 1

The investigations included 333 milk samples obtained from cows of 6 breeds maintained in Poland, i.e. Polish Holstein-Friesian black-white (150) and red-white (40) variety, Simental (29), Whitebacks (28), Jersey (37) and Polish Red (49). Milk was collected in the spring-summer season, when the dietary units included green forage. At the milk sampling a lactation phase was regarded, that is up to 120 days, from 120 to 200 and over 200. In each milk sample there were determined chemical composition, fat molecule diameter, thermostability and rennet induced milk coagulability. The parameters were analysed taking into consideration a cow breed and a lactation phase. It was found that milk of Whitebacks, Simental and Jersey exhibited a better protein-fat ratio and a high level of fat molecules of big-sized diameters. Milk of these cows and Polish Red withstood a sustained thermal treatment at 140°C and showed significantly shorter coagulation time due to a higher protein content. Therefore, milk from cows of these breeds proves more useful for processing, mainly cheese production. The effect of a lactation phase on milk chemical composition, its thermostability and coagulation time was indicated.

17

Effect of polymorphism in gene BTN1A1 on somatic cell count in milk of Jersey cows

75%

Komisarek J., Antkowiak I., Pytlewski J., Dorynek Z., Waskowicz K.

Polish Journal of Food and Nutrition Sciences

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2006

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tom 15/56

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nr Spec.Issue 1

The aim of the study was to analyse the dependence between P35Q and K468R polymorphism in the butyrophilin gene (BTN1A1) and somatic in milk in cattle. The experiment was conducted on a population of 214 jersey cows. Genotypes of the animals were determined using PCR-RFLP. The following allele sequences were found: P35Q – 085 (A) and 0.15 (C); K468R – 0.66 (A) and 0.34 (G). The association analysis was performed for the whole investigated population and with the division into age groups (primiparous and multiparous cows), and taking into consideration the stage lactation (the first, the second and the third 100 days). In case of mutation K468R, milk homozygous AA animals was characterised by the higher somatic cell count. Differences with the highest significance (p≤0.01) were found between genotypes AA and AG in the group of multiparous cows, especially in the initial perid of lactation. In the population of primiparious cows the effect of polymorphism K468R was much lower. A significant difference (p≤0.05 was observed only between homozygotes AA and GG in the first stage of lactation. An analysis performed for polymorphism P35Q did not show significant association with somatic cell counts in milk of cows.

18

Changes in the concentration of selected minerals in milk and blood of high-milking cows during lactation

63%

Nalecz-Tarwacka T., Golebiewski M., Kuczynska B., Puppel K., Wojcik A., Brzezinska M., Czub M., Benet M.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2015

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tom 54[1]

Changes in the concentration of selected minerals in milk and blood of high- milking cows during lactation. The aim of this research was the analysis of the content of calcium, phosphorus and magnesium in milk and blood of Polish Holstein-Frisian (PHF) milking cows during full lactation. The research was conducted on 100 PHF cows during two years (50 cows in each year). Samples of milk and blood were taken in each month of lactation (10 samples) in order to determine minerals concentration. Additionally, samples of forage were pooled out. Study revealed that the level of calcium in the feed is too low, the level of phosphorus – optimal, whereas the content of magnesium exceeds animal demand. There were significant differences in the content of calcium, phosphorus and magnesium in the consecutive months of lactation. The content of minerals in blood was normal; similar situation was observed in the case of the calcium and phosphorus in milk, with the exception of milk magnesium concentration, which was too low and most diversified during the lactation.

19

A comparison of somatic cell counts and urea levels in milk of Jersey and Polish Holstein-Friesian Black-and-White cows kept under identical environmental conditions

63%

Antkowiak I., Pytlewski J.

Animal Science. Scientific Papers of Agricultural University of Poznan

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2006

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tom 08

20

Profiles of selected nutrients affecting skin condition in children with atopic dermatitis

63%

Strucinska M., Rowicka G., Riahi A.

Roczniki Państwowego Zakładu Higieny

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2015

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tom 66

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nr 1

Background. Atopic dermatitis (AD) is a chronic inflammation of the skin recognised to be one of the first clinical signs of allergy. In the first years of life, epidemiological evidence has demonstrated that common causative foods of a child’s diet are: cow’s milk, hen’s eggs, wheat and soya. Children with AD being treated with elimination diets are at risk of nutritional deficiencies that include those nutrients required for ensuring proper skin structure and function. Objective. The aim of the study was to assess dietary intake of nutrients which affect skin condition in children with AD being treated with a milk-free diet. Materials and Methods. Subjects were 25 children aged 4-6 years with AD undergoing the milk exclusion diet and 25 age-matched healthy controls. The energy and nutritional value of diets were evaluated that included those components affecting skin condition; ie. vitamins A, D, E, B2 and C; minerals iron (Fe) and zinc (Zn); polyunsaturated fatty acids (PUFAs). The Dieta 5.0 programme was used for dietary assessment and outcomes were then related to dietary recommendations. Results. There were no significant differences between groups in mean energy values and mean intakes of protein, fats and carbohydrates (p>0.05). The percentage of subjects with low energy value were 44% and 36% in respectively Groups I and II. Deficiencies of fat intake were observed in 60% in Group I and 44% in Group II. There were however no risks in the dietary intakes of protein, carbohydrate, vitamins A, B2 and C nor of Fe and Zn. Deficiencies of dietary intakes were observed in respectively Groups I and II in the following; vitamin E (24% vs 64%), vitamin D (36% vs 92%), linoleic acid (36% vs 72%), α-linolenic acid (36% vs 40%) and long chain PUFAs (96% in both groups). Conclusions. Ensuring recommended dietary supply of those nutrients affecting skin condition is required for both groups of children. Children with AD had better balanced diets in respect of the studied nutrients that may reflect the influence of continuous healthcare received from physicians and dieticians.

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