Rüdiger Kratz - Academia.edu (original) (raw)
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Papers by Rüdiger Kratz
Archives Animal Breeding, 2004
Title of the paper: Effect of sire breeds in commercial pig crosses on growth, carcass compositio... more Title of the paper: Effect of sire breeds in commercial pig crosses on growth, carcass composition, meat and fat quality 200 weaners from a large field trial in Niedersachsen to test different German and foreign sire breeds for their ability to improve the quality of market products were put at an individual feeding trial at the FAL-Nutrition Institute in Braunschweig. It was the aim of this feeding trial to compare the effects of different fat additions to the diet, sire breeds, sexes and slaughter weights upon growth and usual carcass traits but also upon several additional meat and fat quality traits. The trial was carried out in two blocks with 96 pigs each with the sire breeds Pietrain of the two MHS-genotypes PP (stress susceptible) and NN (stress resistant), Duroc and Hamsphire*Duroc (both NN) as preferrably used in Denmark. As control in both blocks the BHZP-standard boar 65 (PI*HA(NN)) was used. Here only the sire breed effects will be reported. In daily gain and energy con...
Journal of Animal and Feed Sciences, 2008
The aim of the feeding trial was to compare the effects of four different dietary fat supplementa... more The aim of the feeding trial was to compare the effects of four different dietary fat supplementations (2.5% of tallow, olive oil, soyabean oil or linseed oil), three sire breeds and both sexes upon pig growth and usual carcass traits, but especially upon several meat and fat quality traits. Ninety-six weaners from different German and foreign sire breeds were tested for their ability to improve the quality of market products. The experiment was carried out with 48 barrows and 48 female growing/fattening pigs. They were progeny of German hybrid sows mated to Duroc, Hampshire × Duroc crosses or Pietrain × Hampshire crosses. The animals were individually kept from 30 to 120 kg liveweight. Growth and slaughter performances of pigs were not signifi cantly infl uenced by the supplemented fat source. The overall mean of intramuscular fat of loin reached only 1.3%, varying between the sire breeds. The fatty-acid composition of backfat and intramuscular fat showed much smaller differences between sire breeds and sexes than between fat supplements to the diets. There were strong correlations between intake (x) and concentration of polyunsaturated fatty acids in backfat (y = 3.73 x-0.91; r 2 = 0.85). Similar correlations were calculated for oleic acid. The results demonstrate that the fatty-acid profi le in backfat and muscle can be substantially infl uenced by fat sources in the diet.
Archives Animal Breeding, 2004
Title of the paper: Effect of sire breeds in commercial pig crosses on growth, carcass compositio... more Title of the paper: Effect of sire breeds in commercial pig crosses on growth, carcass composition, meat and fat quality 200 weaners from a large field trial in Niedersachsen to test different German and foreign sire breeds for their ability to improve the quality of market products were put at an individual feeding trial at the FAL-Nutrition Institute in Braunschweig. It was the aim of this feeding trial to compare the effects of different fat additions to the diet, sire breeds, sexes and slaughter weights upon growth and usual carcass traits but also upon several additional meat and fat quality traits. The trial was carried out in two blocks with 96 pigs each with the sire breeds Pietrain of the two MHS-genotypes PP (stress susceptible) and NN (stress resistant), Duroc and Hamsphire*Duroc (both NN) as preferrably used in Denmark. As control in both blocks the BHZP-standard boar 65 (PI*HA(NN)) was used. Here only the sire breed effects will be reported. In daily gain and energy con...
Journal of Animal and Feed Sciences, 2008
The aim of the feeding trial was to compare the effects of four different dietary fat supplementa... more The aim of the feeding trial was to compare the effects of four different dietary fat supplementations (2.5% of tallow, olive oil, soyabean oil or linseed oil), three sire breeds and both sexes upon pig growth and usual carcass traits, but especially upon several meat and fat quality traits. Ninety-six weaners from different German and foreign sire breeds were tested for their ability to improve the quality of market products. The experiment was carried out with 48 barrows and 48 female growing/fattening pigs. They were progeny of German hybrid sows mated to Duroc, Hampshire × Duroc crosses or Pietrain × Hampshire crosses. The animals were individually kept from 30 to 120 kg liveweight. Growth and slaughter performances of pigs were not signifi cantly infl uenced by the supplemented fat source. The overall mean of intramuscular fat of loin reached only 1.3%, varying between the sire breeds. The fatty-acid composition of backfat and intramuscular fat showed much smaller differences between sire breeds and sexes than between fat supplements to the diets. There were strong correlations between intake (x) and concentration of polyunsaturated fatty acids in backfat (y = 3.73 x-0.91; r 2 = 0.85). Similar correlations were calculated for oleic acid. The results demonstrate that the fatty-acid profi le in backfat and muscle can be substantially infl uenced by fat sources in the diet.