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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Analysis of use characteristics of slow growing chicken hybrid
 DUPAL, Jan
The main aim of the diploma thesis was to analyze the use characteristics of chicken hybrids with slow growth rate. Following hybrids were analyzed: combination of JA 757, who were fed until 49 days of their age and combination of Pac JA with feed length of 56 days. The average live weight of hybrid combination JA 757 was 2 169 g, the feed consumption per kg of weight gain averaged at 2 119 g and the selection rate reached 0.5%. The combination Pac JA reached live weight at slaughter date of 2 109 g, the feed consumption was 2 366 g and 0.88% chickens was selected. The value of Production Efficiency Factor was higher for the hybrid JA 757 (208) compared with the hybrid Pac JA (158). It was found out that the carcass yield of the hybrid JA 757 was about 3.8% higher (74.7% vs. 70.9%) compared to the hybrid Pac JA. Similarly the weight of the breast muscles reached the weight of 405 g in case of the JA 757 which was 53 g more than in case of the Pac JA (352 g). The leg muscle difference was 132 g in favor of the JA 757 (499 g vs. 367 g) while the weight of abdominal fat was lower by 5.5 g (44 vs. 49.5 g). Therefore it can be stated that the difference was statistically highly significant. Furthermore it was found out that cocks reached higher breast and leg muscle weight than hens of both hybrids. The difference was 33 g and 106 g for JA 757 hybrids and 57 g and 79 g for Pac JA hybrids respectively. Also here the difference was statistically highly significant and statistically significant respectively. Overall the hybrid JA 757 proved to have higher genetic potential in intensity growth and also in carcass utility.
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Selected factors that affect broiler chicken meat production
 DUPAL, Jan
Poultry meat has an important role in human nutrition. It is very popular because of its relatively low price from the nutritional point of view (high protein, low fat ratio), but also for its easy culinary preparation. The aim of this thesis is to develop a literature review focused on the intensity of growth, carcass yield and meat quality of broiler chicken and on the external and internal factors which influence them such as genotype, sex, nutrition and feeding, housing system and microclimatic conditions. The conclusion of this thesis consists of a summary of all important factors that significantly affect the production of chicken meat and of an overview of commercial hybrids kept in the Czech Republic.
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See also: similar author names
1 DUPAL, Jakub
2 Dupal, Jiří
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