Czech Journal of Animal Science, 2007 (vol. 52), issue 9
Performance and carcass quality of Czech Fleckvieh, Charolais and Charolais × Czech Fleckvieh bulls fed diets based on different types of silages
L. Bartoň, V. Kudrna, D. Bureš, R. Zahrádková, V. Teslík
Czech J. Anim. Sci., 2007, 52(9):269-276 | DOI: 10.17221/2267-CJAS 
A total of thirty-four Czech Fleckvieh (CF), Charolais (CH) and Charolais × Czech Fleckvieh (CH × CF) bulls with an average weight of 284 kg were included in the experiment and fed ad libitum two mixed diets: MS (based on maize silage) and LCS (based on legume-cereal and lucerne silages) with different concentrations of dietary energy until slaughter at the target live weight of 600 kg. The CF bulls consumed more dry matter (DM) of feed daily than the CH bulls (P < 0.05) and gained weight less efficiently than the CH × CF and CH animals (P < 0.01) during the entire experiment. The killing-out percentage was lower in the CF than...
The effect of growth and development intensity in replacement heifers on economically important traits of Holstein cattle in the Czech Republic
J. Bouška, M. Štípková, M. Krejčová, L. Bartoň
Czech J. Anim. Sci., 2007, 52(9):277-283 | DOI: 10.17221/2263-CJAS
The objective of the study was to determine the effect of growth and development intensity in Holstein replacement heifers on economically important animal traits. The intensity of growth was assessed by the average live weight gain until 14 months of age. In addition, live weight and height at the sacrum at 14 months of age were analysed as indicators of growth and development when evaluating the length of productive life. The milk yield of first-calvers increased as the average daily live weight gain in the rearing period increased. An opposite tendency was recorded for cows in their second and third lactation and the total production also decreased...
Application of FT near spectroscopy for determination of true protein and casein in milk
K. Šustová, J. Růžičková, J. Kuchtík
Czech J. Anim. Sci., 2007, 52(9):284-291 | DOI: 10.17221/2264-CJAS
Our study deals with a possibility of determining true protein and casein in cow's, ewe's and goat's milk and in ewe's colostrums by FT NIR spectroscopy. Samples of milk were analysed by FT NIR in the reflectance mode with the transflectance cuvette. The values of correlation coefficients of calibration were as follows: cow's protein 0.943; cow's casein 0.964; ewe's protein 0.997; ewe's casein 0.977; goat's protein 0.989; goat's casein 0.890; ewe's colostrum protein 0.983. Calibration was tested using the same set of samples by the cross validation method. The values of correlation coefficients of validation were as follows: cow's protein 0.923; cow's...
Influence of composite κ-casein and β-lactoglobulin genotypes on composition, rennetability and heat stability of milk of cows of Slovak Pied breed
A. Michalcová, Z. Krupová
Czech J. Anim. Sci., 2007, 52(9):292-298 | DOI: 10.17221/2268-CJAS
The effect of the phenotypic combination of genetic variants κ-CN/β-Lg on the contents of technologically and nutritionally important components of milk as well as technological properties of milk was investigated in this paper. The samples of milk were collected from 72 cows of Slovak Pied breed in the second lactation coming from three farms, once from the different lactation stage. The genotyping of milk samples was determined by the horizontal electrophoretic separation of milk proteins on starch gel with addition of urea and mercaptoethanol. Statistical analysis was carried out in the programmes Statistica 6.0 and Statgraphic Plus 5.1...
Analysis of linear description of type traits in the varieties and studs of the Old Kladrub horse
V. Jakubec, M. Rejfková, J. Volenec, I. Majzlík, L. Vostrý
Czech J. Anim. Sci., 2007, 52(9):299-307 | DOI: 10.17221/2265-CJAS
An evaluation of the linear description of type in 494 horses of the Old Kladrub breed for 32 traits was used to analyse the effect of variety, stud, sex, year of birth and age at description. A linear model with fixed effects was used. The highest coefficient of variation was calculated for the forelimb side-view (40.14%), chest girth (36.25%) and height at withers (30.97%). 28 out of 32 traits were in the range from 7 to 9 utilized scores. The descriptor used a very high number of scores of the scale. Significant differences between both varieties were found in 13 out of 32 traits. Significant differences were found in 12 out of 32 traits between...
Important factors affecting trout production in the Black Sea Region, Turkey
M. Bozoğlu, V. Ceyhan, H. Avni Cinemre, K. Demiryürek, O. Kiliç
Czech J. Anim. Sci., 2007, 52(9):308-313 | DOI: 10.17221/2266-CJAS
We determined the factors affecting trout production in the Black Sea Region, Turkey, on 55 trout farms. The factors affecting trout production were studied using the Cobb-Douglas production function. The explanatory variables in the model explained 99.4% of the variation in trout production. The partial percentage of the feed-use variable was 99%, whereas that of all other variables was 1%. The education level of operators, feed use and capital use positively affected trout production, whereas the stocking density and pond size negatively affected trout production. Technical assistance and extension programs concerning stocking, feeding and disease...