[The fat content in the muscles of three selected lines of German Landrace swine. Effects of graded feeding intensity on muscle fattening. Muscle fat content in relation to parameters of body fat deposits].

Investigations on muscle fat content and intramuscular adipose tissue pattern of 51 male castrated pigs were performed. For each body 4 muscles were collected after slaughter. Breeding lines of swine (German Landrace) had been selected through 8 generations for high ("E(+)-Line") and low ("E(-)-Line") levels of NADPH-generating dehydrogenases including a control group without selection. 42 animals were kept under feeding experiments of various energy levels from 60 kg up to 100 kg body mass. Additionally, out of control line 5 piglets (25 kg) and 4 hogs (135 kg) were examined. Data of ether-extracted total fat content versus data of fat marbling planimetry correlated well with r = 0.9. The average degrees of muscle fattening were: m. semispinalis capitis (11%) much much greater than m. psoas major (1.8%) greater than m. semimembranosus (1.7%) greater than m. long thoracis (1.3%). The specific internal relation of muscle fattening with respect to the collected samples was calculated as r = 0.8. Intramuscular fat showed the tendency to increase with higher levels of dietary energy. The E(+)-Line showed higher (16%) muscle fattening than the E(-)-Line. The control group, however, showed 44% higher levels than the E(+)-Line. So, the results of that K degree-Line could not serve as baseline for interpretations. The criteria of thickness and harmony of marbling scores were used to make statements of meat quality: The samples of m. psoas major and E(+)-Line reached the best, the samples of m. semispinalis capitis and the K degree-Line reached the least values.(ABSTRACT TRUNCATED AT 250 WORDS)