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Vliv podmínek inkubace na parametry užitkovosti brojlerových kuřat
Opavská, Tereza
This thesis deals with the effect of increased temperature during first 36 hours of incubation on embryonic development, hatchability, day-old chicks quality and subsequently on their growth. The chickens of the control group were hatched at a standard temperature of 100,8 °F and the experimental group had increased temperature of 102,5 °F for the first 36 hours of incubation. The growth experiment was performer on 423 roosters of the Ross 308 hybrid combination from hatch to day 31 of age. The day-old chicks from the control group weighed statistically significantly (P<0,05) more than the experimental group. However, at 10 and 17 day of age, no statistically significant (P>0,05) difference was found between the groups. At the 24 and 31 day of age, the average weight of control group was again statistically significantly (P<0,05) higher than the weight of the experimental group. There was no significant difference in the hatchability of fertilized eggs, which was 92,2 % in the control group and 90,4 % in the experimental group. However, the mean embryonic mortality was 1,76 % and the late mortality 2,47 % in the control group, while the mean mortality was 0,71 % and the late 4,17 % in the experimental group, these differences were statistically significant (P<0,05). The difference in the average weight of the yolk sacs, in the proportion of yolk sacs from live weight and in the activity of T3 (thyroid hormone triiodothyronine), which reached 1,38 nmol/l in day-old chicks of the control group and 1,35 nmol/l in the experimental group was not statistically significant (P>0,05). No statistically significant (P>0,05) difference was found in feed conversion. Based on the results, the increased incubation temperature (102,5 ° F) has had a negative impact on the growth of broiler chickens.
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Březost klisny a nejčastější příčiny abortů
Hueberová, Svatava
This work is targeted on mare gravidity. Its goal is to sumarize aviable knowledge about factors affecting reproduction functions of mares and their influence on prenatal mortality. In this work are described reproduction organs of mare, the reproduction cycle and its neurohumoral control. Work is also targeted on influence of infanticity on large abortion rate of mares.
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Analýza reprodukčního potenciálu dospělých samic prasete divokého
Podlipná, Jiřina
Diploma Thesis focuses on adult wild boar females and analysis of their reproductive potential based on data obtained on drives during main reproduction period (August to January) at 30 areas of interest throughout the Czech Republic in years 2014–2017. Average value detection of Gonadosomatic Index (GSI) out of gravid female wild boars 0,0097 and out of all samples 0,0071. Rut period based on the age of fetuses is from October to January and expected dates of birth are determined by shifting the length of pregnancy towards the rut period with a peak in March. The litter size has just low correlation with the weight and very low with the age, average litter size in adult wild boar females is 6,1 youngsters for hoggets and 6,3 youngsters for wild sows. Average embryonic mortality reaches 13 %. The total sex ratio of piglets is 1:1,08 (M:F), the sex ratio of piglets for hoggets is 1:1,13 and for wild sows 1:1. The resulting finding of this analysis is, that there is no significant difference between the average litter size of hoggets and wild sows, so it is recommended to regulate the number of adult wild boar females year-round irrespective of age of the individuals.
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Březost klisny a nejčastější příčiny abortů
Hueberová, Svatava
This work is targeted on mare gravidity. Its goal is to sumarize aviable knowledge about factors affecting reproduction functions of mares and their influence on prenatal mortality. In this work are described reproduction organs of mare, the reproduction cycle and its neurohumoral control. Work is also targeted on influence of infanticity on large abortion rate of mares.
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