Wyniki wyszukiwania - Biblioteka Nauki

1

Zaleznosci miedzy liczba komorek somatycznych a wydajnoscia i skladem mleka w kolejnych miesiacach laktacji

100%

Neja W.

Zeszyty Naukowe. Przegląd Hodowlany

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2003

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tom 69

111-115

2

Wpływ wybranych czynników na zawartość komórek somatycznych w mleku kóz karpackich

100%

Kawecka A. , Radkowska I. , Sikora J.

Medycyna Weterynaryjna

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2018

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tom 74

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nr 08

EN

The aim of the study was to analyze changes in the content of somatic cells (SCC) in the milk of Carpathian goats with regards to the month of lactation, milk yield and goat age. The research was carried out on a farm in the Podkarpacie region in which Carpathian goats are kept. They are a native goat breed, covered by the genetic resources conservation program. Somatic cells were determined in goat milk samples once a month during routine milk control. The lowest value was recorded at the beginning of lactation in April (719 × 10³ · cm⁻³); it grew in subsequent months, gradually reaching the highest level in October (7311 × 10³ · cm⁻³). There was no effect of goat age and milk yield on the size of the tested parameter. In conclusion, it should be stated that the milk of the Carpathian goats was characterized by a high content of somatic cells and high variability during lactation.

3

Analiza wybranych czynnikow warunkujacych zawartosc mocznika w mleku krow

100%

Nalecz-Tarwacka T. , Grodzki H.

Zeszyty Naukowe. Przegląd Hodowlany

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2004

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tom 72

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nr 1

227-234

4

Wpływ wybranych czynników na pustodój w ćwiartkach wymion krów

80%

Olechnowicz J. , Turki H. , Winnicki S.

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tom 51

5

Próba określenia uwarunkowań zmienności zawartości cholesterolu w mleku kóz w okresie laktacji

80%

Bernacka H. , Siminska E.

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tom 21

6

Wpływ wybranych czynników na liczbę komórek somatycznych w mleku krów wysokomlecznych

80%

Nalecz-Tarwacka T. , Dembinska B.

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tom 81

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nr 4

EN

The aim of the study was to analyze somatic cell count (SCC) In milk of high yielding cows in dependence on various factors: month of lactation and cow age (subsequent lactation), calendar month, day milk yield as well as milk yield for 305 days of lactation. The research was conducted on the randomly selected group of 70 Polish Holstein Friesian cows coming from high yielding dairy herd. The data on dairy performance of the cows were obtained from the breeding documentation. The influence of milk yield (daily and in lactation), lactation number as well as time of the year and lactation stage on SCC In milk was considered. Milk of cows in the first lactation had the best cytological quality. The average SCC Increased together with the subsequent lactation and consequently, with cow age, which indicates to worsening of the udder health in the subsequent lactations. The highest SCC value was recorded in the milk from cows giving up to 20 kg of milk per day, and the lowest one In milk from cows giving over 40 kg of milk per day (453.1 thousand/ml and 282.1 thousand/ml respectively). It was proven, that milk from cows producing over 10 thousand kg of milk per lactation contained more somatic cells than that from lower yielding cows (397.6 thousand/ml and 244.6 thousand/ml respectively). The effect of time of the year and lactation stage appeared to be statistically not significant.

7

Zmiany zawartosci mocznika w mleku w zaleznosci od wybranych czynnikow srodowiskowych

80%

Gulinski P. , Mlynek K. , Salamonczyk E.

Medycyna Weterynaryjna

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2008

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tom 64

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nr 04A

465-468

EN

The objectives of this study were to describe the influence of lactation month, production season, age of cows, production level, milk protein content and udder health status on black-and-white cow milk urea concentrations. Dairy herd improvement of 61928 test-day data were collected over the period of 2000-2003 from 304 south Podlasie dairy herds. The average milk urea concentrations (mg/l), protein content (%) and milk day yield (kg) were as follows: 199 mg/l, 3.42% protein content and 18.4 kg milk day yield while 50% of the total analyzed tested milk had optimal milk urea concentrations from the nutritional point of view (150-300 mg/l). The lactation month, production season, age of cows, production level, protein content groups and udder health status effects were high and statistically significant in every factor at P ≤ 0.05. The highest level of milk urea concentrations were distinguished in the summer season of the experiment (VI-VIII), for cows with the lowest milk protein content (< 3.2%), and lowest somatic cell counts (< 25 thous./ml), and for milk produced at fourth month of lactations. The average urea milk concentrations for those factors were respectively: 225, 213, 217 and 214 mg/1 l.

8

Genetyczne i srodowiskowe uwarunkowania stanu zdrowotnego wymienia krow rasy cb i mieszancow cb x hf

80%

Czaplicka M.

Rozprawy i Monografie. Uniwersytet Warmińsko-Mazurski w Olsztynie

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1999

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tom 24

1-90

9

Wplyw wybranych czynnikow na udzial prob mleka o okreslonej zawartosci bialka i mocznika

61%

Sawa A. , Bogucki M. , Jankowska M. , Krezel-Czopek S.

Acta Scientiarum Polonorum. Zootechnica

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2010

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tom 09

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nr 3

57-64

PL

Na podstawie wyników z 369 060 próbnych dojów 22 997 krów rasy polskiej holsztyńsko- fryzyjskiej odmiany czarno-białej, będących pod oceną użytkowości mlecznej na Pomorzu i Kujawach, wycielonych po raz pierwszy w 2000 i 2001 roku i użytkowanych do 2008 roku analizowano wpływ miesiąca laktacji, wydajności dobowej, wielkości stada oraz pory roku na udział prób mleka o określonej zawartości białka i mocznika. W obliczeniach statystycznych wykorzystano procedury FREQ z pakietu SAS. Wykazano potwierdzony statystycznie wpływ wszystkich uwzględnionych czynników na udział prób mleka o określonej zawartości białka i mocznika. Zbyt mały udział prób mleka świadczących o zbilansowaniu energii i białka w dawkach pokarmowych (szczególnie w odniesieniu do krów będących w drugim miesiącu laktacji (6,6%), w okresie zimy (12,7%) i w stadach o obsadzie do 50 krów (około 14%) a także fakt, że spośród prób mleka z drugiego miesiąca laktacji prawie 85% wskazuje na większy lub mniejszy niedobór energii w dawce skłania do zwrócenia uwagi na konieczność częstszego wykorzystywania wyników oceny użytkowości mlecznej do korygowania dawek pokarmowych.

EN

Data on 369 060 test-day yields of 22 997 Polish Black-and-White Holstein-Friesian cows were used to analyse the effect of lactation month, daily milk yield, herd size and season of the year on the proportion of milk samples with specific protein and urea content. The cows were milk recorded in the Pomerania and Kujavia regions, first calved in 2000 and 2001 and were used until 2008. Statistical calculations were made using the FREQ procedure of SAS.All of the factors analysed had a significant effect on the proportion of milk samples with specific protein and urea content. Too small a proportion of milk samples indicating the balancing of energy and protein in the rations, especially with regard to cows at 2 months of lactation (6.6%), during winter (12.7%) and in herds with up to 50 cows (about 14%), as well as the fact that almost 85% of the samples from the second month of lactation show different degrees of energy deficit in the ration leads us to recognize the need for more frequent use of milk recording results to adjust the rations.