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The material consisted of 60 hybrid boars, from line 990 (female) and Pietrain breeds (male), divided into two groups depending on the litter size in which they were born and reared - group: 7-10 piglets (average 8.8) per litter; group: 11-17 piglets (average 12.5) per litter. The mean body weight of 21 day of live piglets born and reared in larger litters was significantly (P < 0.05) lower than among boars reared in smaller litters. This difference gradually diminished and at day 63 of life both groups had the same average body weight. In the period from 63 to 180 day of life, the boars from smaller litters had a slightly lower rate of growth (statistically insignificant). Boars reared in larger litters at 180 day of life were on average 3 kg heavier. There were no significant differences in fat thickness, lean meat and testicular volume between the assessed groups of young boars. From boars reared in smaller litters ejaculates had a significantly higher (P < 0.05) sperm concentration and total sperm volume.
A total of 12 Limousin bull calves were assigned to two feeding groups (6 animals per group) analogous in terms of body weight. Bulls were reared during calfhood with suckler cows and then fed indoors with farm-produced feeds (silages, hay, concentrates) to obtain a body weight gain of approximately 1000 g/day. The basic bulky feed was maize silage (fed ad libitum), supplemented with meadow hay (1 kg/day), and different amounts (according to group) of concentrate (kg/100 kg body weight): 1.0 (group KK-I) or 0.6 (KK-P). The study showed that compared to semi-intensive feeding, intensive feeding of Limousin bulls in the finishing period with diets containing maize silage, meadow hay and concentrate had a more favourable effect on fattening traits, slaughter traits, economic efficiency of feeding and fatty acid profile in the intramuscular fat, n-6/n-3 PUFA ratio and total cholesterol content of the longissimus muscle.
The objective of the study was to determine relationships between the fattening traits and the slaughter traits and chemical composition of meat in fatteners, hybrids after boars of high-meat breeds. The study was carried out on 80 fatteners (40 gilts and 40 barrows) fed with rationed mixture.
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