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1

Zaleznosci miedzy poziomem mocznika w surowicy krwi a wydajnoscia i skladem mleka krow

100%
Chladek G.
Medycyna Weterynaryjna
|
2002
|
tom 58
|
nr 11
871-873
2

Vzah vybranych ukazatelu mlecne uzitkovosti u soboru bojnic cernostrakateho plemene na jednotlivych laktacich

63%
Chladek G., Kucera J.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Konferencje
|
1998
|
tom 17
3

The effect of year, season, breed and reproduction cycle on some blood plasma parameters in cows and heifers

63%
Kucera J., Chladek G.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika
|
2004
|
tom 51
The observation was carried out in a group of 70 female cattle in the course of two years. The animals were kept in suckler herds. They were provided with pasture grass and maize silage indoors during the grazing season and with forage ration (silage and hay) in winter. The aim of the study was to assess the effect of year (2001 and 2002), season (spring and autumn), breed (Aberdeen Angus AA, Beef Simmental BS, Blonde d'Aquitaine BA, Charolais CH, Hereford HE and Limousin LI) and reproduction cycle (pregnant heifers PH, non-pregnant heifers NPH, pregnant cows PC, non-pregnant cows NC and lactating cows with calves LCC) on some blood plasma parameters. Mean values of these parameters were following: Total protein 72.37 gl⁻¹ , glucose (Glu) 3.23 mmol∙l⁻¹, urea (Urea) 4.39 mmol∙l⁻¹, bilirubin (Bilir) 4.63 mmol∙l⁻¹, alkaline phosphatase (ALP) 1.02 µkat∙l⁻¹, asparate aminotransferase (AST) 1.29 µkat∙l⁻¹, gamma glutamyltransferase (GMT) 0.30 µkat∙l⁻¹, sodium (Na) 114.33 mmol∙l⁻¹, calcium (Ca) 2.30 mmol∙l⁻¹ and phosphorus (P) 1.99 mmolT1. Year affected TP, Glu, Bilir, ALP, AST (all p<0.01) and urea (p<0.05). Season affected TP, Glu, urea, Bilir, Ca, P (all p<0.01) . There were significant differences in urea, GMT, Ca and P between breeds. Reproduction cycle affected TP and Glu (p<0.05). It can be concluded that year and season affected the observed blood plasma parameters considerably more than breed or reproduction cycle.
4

Analysis of the development in the rearing of beef breeds in the Czech Republic

63%
Chladek G., Kucera J.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Konferencje
|
2000
|
tom 24
5

The construction of the selection index for Czech Spotted cattle with regard to their dual-purpose character

63%
Kucera J., Chladek G.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Konferencje
|
2000
|
tom 24
6

The effect of share of Holstein blood on fattening performance and carcass grade of slaughter bulls

63%
Chladek G., Kucera J.
Animal Science Papers and Reports. Supplement
|
2002
|
tom 20
|
nr 1
7
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Dlugosc uzytkowania mlecznego krow - konsekwencje produkcyjne i ekonomiczne

51%
Juszczak J., Hibner A., Chladek G.
Postępy Nauk Rolniczych
|
2003
|
tom 50
|
nr 2
81-90
The aim of research was to establish the relations between length of cows' performance and such production and economic indices as: milk yield (lactation and life-time yield) and costs of milk production, including depreciation costs of the heifer and its share in costs of production and in the market milk price. Production and economic results of dairy unit with the average herd size of 720 cows and milk yield of ca 7000 kg per cow and year were the basis for calculation. Significant effect of the length of performance on production efficiency was shown. Cost of milk production from cows performance of which lasted 1 lactation surpassed market value of milk by 44%. Subsequently, steady drop of production costs in relation to market value of milk was observed down to only 33% milk market value in cows performance of which lasted 8 lactations. The share of heifes depreciation cost was amounted 62 and 11% costs of milk production and 89 and 8% milk market value, when the performance lasted 1 and 8 lactations respectively. At the average length of cow performance in herd lasting 3.19 years and when costs of production equalled to 91% milk market value, the losses generated by cows culled after 1st lactation were compensated with cows kept producing for the 2nd and 3rd lactation. Not till the performance of cows lasted over 3 lactations the economic relations begun to be positive - cost of milk production was lower than ist value.
8

Relations between blood plasma lipids, glucose and urea concentrations in cows in post partum period and their reproductive performance

51%
Machal L., Chladek G., Hibner A., Zizlavsky J.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika
|
1999
|
tom 45
Blood samples were taken from 134 Holstein cows between day 20 to 100 postpartum to determine the concentration of urea, cholesterol, glucose and total lipids and to define their relation to the reproductive performance traits: interval (I), service period (SP) and insemination index (II). Investigations were carried out in monthly intervals from October 1996 to October 1997. Average values of plasma urea, total lipids, cholesterol and glucose for the entire period studied were 5.78 mmol.1⁻¹, 3.61 g.l⁻¹, 3.34 mmol. l⁻¹ and 3.61 mmol. l⁻¹, respectively. High concentration of blood urea was related negatively with the value of the insemination index (rp = -0.51). When the average concentrations of total lipids were low in plasma in the specified time (month) negative correlations were found between total lipids and the length of service period (rp = from -0.23 to -0.54) and value of the insemination index (rp = -0.42). The concentration of plasma total lipids increased in time from post partum. Traits of reproductive performance were affected by the internal environment. Especially negative influences were observed when the concentration of plasma urea as well as total lipids and cholesterol increased or decreased abnormally.
9

Correlation between the relative permittivity, conductivity, and qualitative indicators of bull and boar ejaculates

51%
Machal L., Krivanek I., Chladek G., Dolezal P.
Journal of Animal and Feed Sciences
|
1997
|
tom 06
|
nr 1
13-22
10

Mleko optymalnym zrodlem wapnia

51%
Adamski M., Chladek G., Kucera J.
Przegląd Hodowlany
|
2002
|
tom 70
|
nr 01
14-16
11

Vyuziti spolecne pastvy skotu a ovci pro zlepseni ekonomiky chovu masneho skotu

51%
Zizlavsky J., Chladek G., Kucera J.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Konferencje
|
2000
|
tom 24
12

The relationship between blood plasma cholesterol and milk yield in Holstein cows

51%
Chladek G., Machal L., Hibner A., Nowakowski P.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika
|
2001
|
tom 48
Groups of 19 to 24 dairy Holstein cows were observed monthly for the period of 12 months (12 test days). The aim of the study was to observe the relationship between blood plasma cholesterol concentration and milk production and milk components. The mean milk yield was 33.8 kg with milk protein content 2.96%, milk fat content 4.02% and cholesterol concentration in blood plasma 3.44 mmol/1. Cows in the experimental groups were in their early lactation (on average 58.6 days after calving). The coefficients of the correlation between blood plasma cholesterol and some milk production parameters calculated for each test day ranged as follows: - 0.361 to 0.437 for milk yield, -0.275 to 0.203 for milk fat content and -0.181 to 0.480 for milk protein content. Polynomials of the third degree or higher were calculated for the observed parameters so as R~ was higher than 0.5. The calculated coefficients of correlation between blood plasma cholesterol content and milk production parameters did not reveal a clear tendency in the relationships. However, the graphical polynomial expression of relationships showed a positive relationship between blood plasma cholesterol content and milk yield and a negative relationship between blood plasma cholesterol and milk protein content. No relationship was found between blood plasma cholesterol concentration and milk fat content due to high variability of fat content in milk.
13

The influence of the source of sulphur on its intake by sheep

51%
Chladek G., Kuchtik J., Zapletal D.
Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika
|
2004
|
tom 52
The intake of sulphur offered in different forms was observed in ten ewes of Merino breed during one year. Four sources of sulphur were used: ammonium sulphate, sodium sulphate, calcium sulphate and sulphur. The effect of season (sprihg, summer, autumn and winter) and a phase of reproduction cycle (gestation, lactation, barren period) on the consumption of various sulphur sources were analysed. Significant differences in the intake of sulphur were found in summer, winter (both p<0.01) and autumn (p<0.05) and non-significant differences in spring. A phase of reproduction also affected the intake of sulphur; significant differences were found during gestation, barren period (both p<0.01) and lactation (p<0.05).
14

Relation among blood plasma total lipids, cholesterol, glucose and urea concentrations, and reproductive performance in Bohemian Spottet cows

51%
Machal L., Chladek G., Zizlavsky J.
Journal of Animal and Feed Sciences
|
1999
|
tom 08
|
nr 2
209-221
15

Comparison of beef production and meat quality of Holstein bulls fattened to a lower live weight in loose and tethered housing systems

51%
Chladek G., Dobicki A., Ingr I.
Electronic Journal of Polish Agricultural Universities. Series Animal Husbandry
|
2001
|
tom 04
|
nr 2
The experimental group consisted of 57 young Holstein bulls kept in the Czech Republic; 35 bulls were tethered and 22 bulls were loose housed. The aim of the study was to analyse and compare the effect of different housing systems on feedlot performance, carcass value and meat quality and their mutual relationship. The overall average values were as follows: feedlot performance parameters live weight at slaughter 434.3 kg, age at slaughter 455.8 days, total weight gain 319.3 kg, duration of fattening 342.1 days, daily weight gain 941 g; carcass value parameters dressing percentage 51.0%, net daily weight gain 482 g, weight and proportion of kidney fat 3.9 kg, 1.8% resp., weight and proportion of fat trim 2.2 kg and 2.0% resp.; meat quality parameters dry matter, fat and collagen content in muscle 23.8, 1.46 and 1.13% resp., pH24 6.08, drip loss 0.849% and remission (525 nm) 6.4%.
16

Yearlong dynamics of relationship between milk production and milk composition and blood plasma total lipids in Holstein-Friesian cows

51%
Chladek G., Machal L., Klupczynski J.
Polish Journal of Natural Sciences
|
2003
|
tom 13
17

Growth rate of calves and condition of their Red-and-White, Charolais, F1 or R1 dams in relation to the genetic polymorphism of milk proteins

51%
Dobicki A., Chladek G., Zachwieja A.
Animal Science Papers and Reports. Supplement
|
2002
|
tom 20
|
nr 1
18

Selenium content of beef and its effect on drip and fluid losses

51%
Simek J., Chladek G., Koutnik V., Steinhauser L.
Animal Science Papers and Reports. Supplement
|
2002
|
tom 20
|
nr 1
19

Copper, phosphorus and calcium in bovine blood and seminal plasma in relation to semen quality

51%
Machal L., Chladek G., Strakova E.
Journal of Animal and Feed Sciences
|
2002
|
tom 11
|
nr 3
20

Heritability and correlations of selected milk efficiency indicators of the Black and White [Holstein] dairy cows in the Czech Republic

51%
Chladek G., Kucera J., Dorynek Z.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2000
|
tom 02
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