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Zhodnocení vybraných ukazatelů složení mléka v průběhu laktace u ovcí plemene cigája
Bartoň, Petr
This master’s thesis evaluates selected indicators of the quality of sheep milk and its components. The sheep of the selected Tsigai breed are bred in the northern part of Zapadni Tatry in Slovakia. As a part of the thesis pool samples of sheep milk were collected at periodic intervals. The pool samples were collected on the average 45th, 75th, 105th, 135th, 165th, 195th, and 225th day of the lactation period. A group of Improved Wallachian breed sheep was added to the experiment for comparison. The milk of the Tsigai breed contained on average 20.03 % of dry matter, 8.14 % of milk fat, 6.38 % of proteins, 4.70 % of lactose, and 63.86 mg/100 ml of urea. The following physicochemical traits were assessed: active acidity, titratable acidity, and a freezing point of the milk. The average value of active acidity was 6.55, of titratable acidity 9.2 °SH, and of the freezing point -0,576 °C. The last sample surprisingly contained a low amount of lactose, however, the most surprising finding was an extremely low amount of somatic cell count at the end of the lactation period. Ascertained correlations correspond with the available papers and do not differ significantly. The acquired results for the Tsigai breed are comparable with the comparison breed of Improved Wallachian.
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Vlivy působící na hmotnost jehňat při narození
PITROVÁ, Ludmila
The aim of the Diploma thesis was to monitor and evaluate selected influences on the weight of lambs at their birth. There were used basic breeding records of 604 lambs of both sexes in the breed of Wallachian sheep from the farm Ing. Jan Vejčík for the analysis. Birth weights were evaluated according to sex, litter frequency, litter order, paternal line and the year of birth. The results of the comparison brought the following findings. The influence of the father on the live weight of the lambs at birth was confirmed by the F test based on the significance level (p < 0.05 to 0.01) as statistically significant to almost highly significant. Comparing the average weight of lambs at birth by father´s line, the birth weight of lambs of the VALVEJ line clearly prevails. Moderate differences were shown between the effects of the frequency and order of litter, the other in terms of importance was the influence of the year of birth of lambs. The effect of sex of live-born lambs was statistically insignificant.
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The Rate the level of sheep breeding and its economic potential on family farm.
JINDRÁK, Miloslav
The task of my dissertation was to rate the level of sheep breeding and its economic potential. The monitoring and the evaluation of indicators were performed at the farm of Miloslav Jindrak. The collection of enter data proceeded from 2005 to 2008. The needed data was taken from the personal evidence of the sheep farmer. This data was compared with the data of the inspection of efficiency, which is run by the Federation of sheep and goat breeding in the Czech Republic. The dissertation monitors and evaluates reproductive, productive and economic indicators of the monitored sheep herd.
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Variabilita složení a kvality ovčího mléka v průběhu laktace
Nováková, Vendula
The primary purpose of this study is to determine variability of sheep milk composition and quality. The theoretical part of this study describes composition of sheep milk. It analyses properties and elements which effect quantity and quality of sheep milk. This study research focuses on monitoring and evaluation of changes in sheep milk composition and properties which is seasonaly effected. The research also evaluates the differences in composition and properties of organic and conventional milk. Data for this research were collected between 2014 and 2015. The sample was selected from the East Friesien, Laucane and Cigaja diary breeds. Criteria which were evaluated: the number of microorganisms, active acidity, titratable acidity, coagulation time, curd quality, content of total fat, total protein, total lactose, total solids -non-fat, milk urea, somatic cell count and milk freezing point. Statistical and graphical evaluation of the analyzed data was compared with similar studies.
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Zhodnocení mléčné užitkovosti ovcí v průběhu laktace
Kryštofová, Kateřina
The aim of the thesis was analyse of sheep milk composition during lactation. Milk was analysed for milk yield, total solids, fat, protein, lactose, somatic cell coun (SCC), active acidity (pH), titratable acidity, rennet clotting time and rennet curd quality and then recorded data were satistically analyzed by program STATISTICA. The samplings were carried in months April – September 2018 on sheep farm in Br-níčko. The samplings were carried from eight selected ewes on the second lacatation and the immediately after collection the milk cooled, and transported to the analyses of in-dividual components into specialized laboratories. The average milk yield in the stage lacatation in 2018 was 1.39 l. Milk from these ewes contained an average of 18.41 % total solids, 7.01 % fat, 6.02 % protein, 4.71 % lactose, 103 thousand SC/ml. Milk showed values on average pH 6.63, titration acidity 9.51 °SH, rennetability 115 second and rennet curd quality was 1.34 (1.quality class). The results of this study indicate that high statistical significant effect of lactation stage was found on all chosen parametres except titration acidity, somatic cells count and rennet curd quality.
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Zhodnotenie pripúšťania a inseminácie u synchronizovaných oviec
Cedzová, Katarína
The aim of bachelor´s thesis “exaluation of breeding and insemination of synchronized sheep“ is to describe options of reproduction of sheep used in our country, to familiarize with anatomy of sheep reproductive organs, and to describe individual methods of breeding and insemination. We focused on natural and artificial methods of reproduction and preparation of an individual and flock of sheep for reproduction. We followed the process of natural methods of reproduction with the help of ethological observation of two little flocks of sheep of Zwartbles breed at a small family farm in Mohelno.
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Mléčná užitkovost plemene lacaune ve vybraném chovu
CHODCOVÁ, Anna
This thesis deals with the influence of age of lacaune breed ewes on milk performance, influence of parity and influence of stage of lactation on milk performance in terms of the milk yield and the content of individual components of milk. Further was evaluated the influence of rams on milking. Data from farm Statek Horní Dvorce s.r.o. were used and data from Svaz chovatelů ovcí a koz z.s. were used too and entries from years 2014, 2015, 2016 and 2017, when the milk performance was monitored by method AT. The influence of rams on milking has not been fully demonstrated. For the four comparing lines, the statistically significant difference was only between LINUX and LUPIN, and only in one year of performance control over the three years compared. From the point of view of the influence of age on total milk yield in the studied farm, fat and protein content of lacaune breed increased with increasing age, whereas the lactose content showed a decreasing trend. The influence of parity had a significant effect on the monitored parameters of milk. With an increasing parity, the protein content was slightly increased, the fat and lactose content decreased. Ewes on the second lactation showed the best results in milk yield, since the third lactation was recorded in milking a decrease. The influence of stage of lactation on milking and on the content of individual components of milk was also significanted. With prolonged lactation the milk yield and lactose content were decreased. The fat and protein content has been shown to increase with the increasing of the stage of lactation.
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Zhodnocení vybraných ukazatelů mléka u ovcí plemene lacaune při aplikaci pastevního odchovu
Sedláková, Markéta
The aim of the thesis was to evaluation of the selected indicators for ewes breed la-caune in grazing rearing. On the basis of donations of milk at regular intervals and the subsequent analysis of the milk was carried out the evaluation of the individual indica-tors. Sheep's milk came from pure-bred ewes breed lacaune (LC). The ewes from which it was collected, milk, have been on the 2. lactation and an only child. The sheep, a breed of lacaune (LC) are kept at the farm top of the Areola. This farm currently has the largest number of pieces of pure-bred sheep breed lacaune in Czech Republic. Carried out with a total of 5 subscriptions from late April to early September in the intervals of 62. day, 90. day, 125. day, 153. day and 195. day of lactation. First was the evaluation of milk yield and the measurement of daily milk yield was carried out by means of mechanical milk rates. Immediately after collection the milk cooled, and transported to the analyses of individual components into specialized labo-ratories. In the stage of lactation in 2015, the average milk yield 1,68 l. Milk from these ewes contained an average of 18,00 % dry matter, fat 7,43 %, 5,16 % protein and lactose 4,67 %. It was furthen evaluated physical and chemical composition of milk, into which encompass the titratable acidy, pH. The average value was at pH 6,59 and the titratable acidy 9,96 SH. And the technological properties of the average length of rennet clotting time 113,2 seconds and rennet curd quality 1,60, holding shape.
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Estimation of Genetic Parametrs in Selected Reproduction Traits of Sheep and Revision of Existing Evaluation of Animals
Schmidová, Jitka ; Vostrý, Luboš (advisor) ; Jan, Jan (referee)
The objective of this investigation was to select the proper model for genetic parameter estimation, to estimate genetic parameters, and to predict breeding values for litter size in most common sheep breeds in Czech Republic. A total of 143 896 lambing records from 1990 to 2012 were analysed. Variance components and genetic parameters for litter size were estimated separately for each breed using the BLUP animal model with repeatability. The basic model equation contained ewe age as a fixed effect and random effects of contemporary group, permanent environment and direct additive genetic effect of the animal. Modifications of the basic model were examined when various combinations of mating effects were included (contemporary group of ewes during mating (harem), additive genetic and permanent environmental effect of service ram).
Estimates of phenotype variance increased across breeds (0.236 for Šumava to 0.779 for Romanov) with increasing breed average for number of lambs per litter. Variance component estimates for permanent environmental effect of the ewe were low (0.0001 to 0.0262). The variance of common environment of contemporary group (from 0.0223 to 0.1309) had bigger influence on the total variability of litter size in almost all studied breeds then additive genetic variance (from 0.0146 to 0.0587). The lowest heritability and repeatability estimates were for the Šumava (h2=0.0619; w2=0.0823) and Romney breeds (h2=0.0626; w2=0.0811); while the highest were for Merinolandschaf (h2=0.1091; w2 = 0.1129).
The effect of service ram ranged from 0.01 to 0.02 of phenotypic variance in Šumava sheep, in Romanov sheep it was from 0.05 to 0.10, and in Suffolk sheep it was from 0.04 to 0.05. Including effects of mating (service sire, harem, and/or ram´s permanent environmental effect) in the model decreased deviance information criterion, what means that these models are more proper than the basic one.
Results from present study demonstrate that genetic parameters did differ among the investigated breeds, which should be taken into account in breeding value estimation. The service rams have low but a clearly detectable influence on litter size of their mates. Genetic parameter estimates indicate that direct selection on the service ram effect could increase litter size and achieve genetic gain through ram selection.
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