The aim of this study was to establish the impact of slaughter weight, sex and the intramuscular fat (IMF) content of the musculus longissimus lumborum et thoracis (MLLT) on the carcass value of (Czech Large White x Czech Landrace) x Duroc hybrid pigs. The average lean meat content was higher in gilts (56.51 %) than in barrows (55.89 %). Average IMF content was recorded as 3.76 % in barrows and 3.42 % in gilts. The slaughter weight of the pigs did have an impact on the IMF content of the MLLT. The higher average slaughter weight (121.61 kg or 120.68 kg) of pigs intended for slaughter was established in pigs with a higher average IMF content (3.52 % or 5.20 %). Neither sex nor slaughter weight affected the monitored indicators of meat colour. The IMF content of the MLLT had no significant impact on carcass value indicators.
The goal of this experiment was to establish the effect of genotype, sex and intramuscular fat (IMF) content in the musculus longissimus lumborum et thoracis (MLLT) on the colour of pork. The values of meat colour parameters were balanced in both gilts and barrows without significant differences (p < 0.05). The average value of the lightness parameter L* was 61.35 ± 5.31 in barrows in our research and 60.14 ± 4.94 in gilts. The percentage of yellow spectrum b* ranged within a narrow zone of from 13.67 ± 2.14 (gilts) to 13.88 ± 2.02 (barrows). The colour saturation value (C*) for meat from barrows (14.42 ± 2,33) differed by just 0.21 from the meat from gilts (14.21 ± 2.51). The lightest meat with the highest L* value, was from pigs to be slaughtered with the highest IMF content (5.00 to 9.50%) 62.53 ± 4.26, or the group with a IMF content of 3.00 to 3.99% (62.12 ± 4.96). The lightness value was lowest (58.73 ± 5.43) in the group with the lowest IMF content (1.85 to 2.99%). To establish the effect of genotype on the colour of pork two hybrid combinations were monitored: (CLW × CL) × D and (CLW × CL) × (D × BL). Different paternal lines in the groups did not affect any of the meat colour indicators significantly.
The aim of the experiment was to analyse reproductive characters in hybrid pig combination (CLW x CL) x (D x Pn). These reproductive traits of sows were studied: number of all, live born and weaned piglets, loses from live born piglets till weaning. These influences with an impact on reproductive characters were monitored: order of litter, number of piglets in a litter, birth weight of piglets, influences of sex and litter order on birth weight of piglets. An average number of all born piglets per sow and litter it was 13.25 piglets. From this an average number of live born piglets it was 12.48 piglets per sow and litter and from each litter there was 11.40 of weaned piglets. The highest number of live born piglets was reached in sows on the fourth litter -14.50 piglets. On eighth and nineth litter fertility decreased to 11.60 and 11.00 piglets. Statistical conclusive difference (P ≤ 0.05) was found between fourth (14.50) and nineth (11.00) litter. Among birth weight in both sexes a statistical conclusive difference (P ≤ 0.05) was found. Higher birth weight (1.46 kg) was found in boars in comparison with gilts (1.40 kg). The highest birth weights in gilts were reached in litters of sows on the second and nineth litters -1.49 kg and 1.48 kg. Birth weight decreased on tenth litter with average weight of 1.28 kg. The highest birth weight in boars was detected on the seventh litter but on the seventh litter piglets of only one sow were weightened so the result 1.67 kg is not objective. The second highest average birth weight was reached on the third litters -1.53 kg. On the contrary the lowest average birth weight was on the fourth and tenth litters where boars reached weight of 1.28 and 1.25 kg. Statistical conclusive difference (P ≤ 0.05) was found between the second (1.53 kg) and tenth (1.25 kg) litter.
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