|
|
Effect of selected factors affecting the percentage of lean muscle in pig carcass
KOLÁŘOVÁ, Eva
The aim of the thesis was to obtain information on the effect of hybrid combination, gender and weight of cold JUT on carcass ratios in final pig hybrids. 1742 pig carcasses of four hybrid pig combinations were included in the carcass monitoring: PIC, Topigs, Danbred and France Hybrides. The average carcass weight was 89 kg with an average muscle mass of 59.5%, represented mostly by quality classes S and E. The higher fat content of pigs versus gilts was shown. With increasing slaughter weight, the proportion of muscle decreased and the proportion of fat increased.
|
|
|
Vliv hybridní kombinace a porážkové hmotnosti na jatečnou hodnotu prasat
SCHEUFLER, Vladimír
The aim of this bachelor thesis is to evaluate the dependence of the carcass value of pigs on the slaughter weight and the hybrid combination.The carcass value represents a summary concept characterized by a complex of quantitative and qualitative indicators. The slaughter weight and the influence of a breed are two main factors, wich are affecting the carcass value. It is impossible to concentrate all required commercial attributes at a corresponding level in single breed, therefore it is necessary to obtain final hybrids by a targeted selection and deliberate combination of breeds, thus reaching satisfying results for both producers and customers.
|
|
|
Faktory ovlivňující parametry užitkovosti u brojlerových kuřat
Dragúňová, Pavlína
This thesis focuses on observation and evaluation of factors influencing parameters of broiler's chickens performance. In the first part of the study the effect of parent stock age and weight of one day old chickens in 28 batches was observed. The effect on follows parameters was evaluated: weight of one-day chickens, weight of chickens in age of 14, 21 and 28 days, weight at the end of the fattening and feed conversion ratio. In the second part of this thesis 774 batches was evaluated. The effect of farm, years of fattening, feed mixtures supplier, month of fattening, final hybrid on feed conversion ratio, weight of chickens at the end of the fattening and index of fattening productivity were evaluated.
|
|
|
Meat quality of final pig hybrids
VONDRUŠKOVÁ, Jana
The aim of this thesis was to inform about pig genotypes and sex influencing selected traits of meat quality. Several combinations of the final pig hybrids (CLxCLW)xCLW-sire line, (CLxCLW)x(CLW-sire line x Pn), (CLxCLW)x(DxPn) and (CLxCLW)x(CLW-sire line x D)with balanced sex ratio (barrows : gilts). The highest intramuscular fat content (2,15 %) has been detected in the (CLxCLW)x(CLW-sire line x D) hybrid combination; the barrows (1,78 %) reached a higher ratio compared to gilts (1,42 %). There were detected only small differences in traits pH45 and pH24, there was not even found any difference between the two sexes. The lightest meat (% remission) has been proven by the (CLxCLW)xCLW-sire line combination with no significant difference between sexes. There have been quite similar values between the sexes and even hybrid combinations, concerning the meat lightness (L*). The drip loss was highest in the (CLxCLW)x(DxPn) combination with only fractional difference between sexes. In the shear force has been detected the lowest value in the (CLxCLW)x(CLW-sire line x Pn) combination with a small difference between barrows and gilts. From the genotype aspect were confirmed statistically important differences in the following traits: intramuscular fat content, meat lightness (% remission), drip loss and shear force. From sex aspect, only differences in intramuscular fat content were found.
|
|
|
The influence of slaughter weight and sex on carcass of pigs.
VONDRUŠKA, Miroslav
The aim of this thesis was to obtain information on the genotype and sex influence on carcass characteristics of pigs of the following final hybrids combinations: (CL x CLW) x CLW ? sire line, (CL x CLW) x (CLW ? sire line x Pn), (CL x CLW) x (D x Pn) and (CL x CLW) x (CLW ? sire line x D) with a balanced sex ratio (barrows: gilts). An influence of the genotype on the lean meat content has been proven, while the (CL x CLW) x (D x Pn) combination reached the highest values, with an average of 57.95 %. A statistical significance of differences was also found between the sexes, when gilts reached 58.06 % average lean meat content, compared to the barrows 54.70 % average lean meat content (3.36 % difference). The back fat thickness showed a high statistical significance in terms of genotype, the lowest back fat thickness was measured in the (CL x CLW) x (D x Pn) combination with value of 21.69 mm. Barrows reached higher values, the average height of gilts was 22.03 mm, 25.25 mm in barrows. In the loin eye area indicator, the genotype influence has not been proven. For gilts, the mean value of 5228 mm2, in barrows value of 4707 mm2. Content of main meat parts, or more precisely hams, presented statistically significant differences in terms of genotype. The (CL x CLW) x (D x Pn) combination reached the highest values, with content of 53.23 %, 21.9 % respectively. A significant statistical difference was determined also between sexes, with an average main meat parts of gilts and barrows 51.32 % and 48.45 %, respectively; in the case of ham 21.07 % and 19.98 %. The slaughter weight in relation to the lean meat content showed a very good value in the mass range less than 100 kg (57.84 %), but the muscle proportion 57.16 % has been positive even in the mass range 100 ? 109.9 kg.
|
|
| |
guest ::
