Effect of undesirable reddish-brown seaweed (Porphyra tenera, nori) in diet on performance, utilization of nutrients, development of backfat and susceptibility of pork meat to oxidation in pigs during fattening
2008
Murakami, H.(National Agricultural Research Center for Kyushu Okinawa Region, Koshi, Kumamoto (Japan)) | Matsumoto, M. | Inoue, H. | Morishita, K. | Kaji, Y.
Eight LW x D crossbred, castrated male pigs (mean of initial body weights was about 55 kg), were used in a 8-week growth trial to investigate the effect of reddish-brown seaweed (Porphyra tenera, Nori) in diet on performance, utilization of nutrients, development of backfat and susceptibility of pork meat to oxidation during fattening. Pigs were assigned to two dietary treatments and fed a corn-soybean meal-based diet (control) or the diet supplemented with 2% of dried reddish-brown nori powder. During the 8-week trial, the DM, OM and N digestibilities were measured twice in periods of BW 50-80 kg and BW 80-110 kg. On day 0, 14, 28, 42 and 56 of the 8-week trial, backfat thickness and plasma thiobarbituric acid reacting substrate (TBARS) were measured. Loin sample were gotten 2 days after the slaughter and carcass grading in a commercial slaughterhouse and TBARS concentrations in the Loin stored under 4degC and fluorescent light were measured on day 0, 2 and 4 after the thawing. During the period of BW 50-80 kg, feed intake of pigs fed the diet supplemented with nori compared with the control diet was significantly lowered, but there was no difference in BW gain of pigs between two dietary treatments. Therefore, there was a trend toward an improvement in feed efficiency in pigs by feeding of nori. There were no differences in performance of pigs during the period of BW 80-110 kg between two dietary treatments. DM digestibility of pigs fed the diet added nori compared with the control diet was significantly improved during the period of BW 50-80 kg, but there were no differences in nutrient digestibilities of pigs during the period of BW 80-110 kg among two dietary treatments. Although there was no difference in backfat thickness at P2 of pigs between two dietary treatments, irrespective of measuring day, dressed carcass judged to be below standard because of over-thickness of backfat were fewer in pigs fed the diet supplemented with nori compared with the control diet. There was no difference in plasma TBARS of pigs between two dietary treatments, irrespective of measuring day. TBARS concentration in the loin of pigs fed the control diet increased by the storage under 4degC and fluorescent light, but not in the loin of pig fed the diet supplemented with nori.
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