The aim of the study was to investigate the protein restriction effect on Cinta Senese pigs reared outdoor. Twenty-Two Cinta Senese pigs (13 barrows and 9 females), weighting averagely 38 kg, were equally divided in 2 groups. One group (NP) was fed with a 12% of crude protein (CP) diet, while the second (PR) with a protein restricted diet (9% of CP). After 5 months, the 2 groups were fed with the same diet (10% of CP). Pigs were weighted every 3 weeks; the average daily gain (ADG) and the feed conversion index (FCI) were calculated. Six hours after slaughtering, carcass weight and percentage of the main cuts were detected on the right side. On a loin sample joint (LS) (2th - 5th lumbar vertebra) the percentages of intermuscular fat, bone, inner and outer subcutaneous fat, lean, longissimus lumborum and psoas major muscles were determined. Data were analyzed by the analysis of variance (SAS). PR pigs, once fed with the 10% CP diet, showed an ADG from 5 months to slaughter of 0.496, which was significantly higher respect of that showed by NP pigs (0.443). Moreover, PR pigs resulted in a higher slaughtering weight (161.9 kg) than NP pigs (151.9 kg). Regarding the main cuts, the principal differences were found in loin and ribs percentage (14,12% in PR group and 15.93% in NP group) and in lard percentage, which showed an opposite trend, being higher (14.52%) in PR pigs than in NP pigs (11.69%). Examining LS tissue composition, protein restriction affected inner subcutaneous backfat (39.16% in PR pigs vs 33.31% in NP pigs) and psoas mayor (5.30% in PR group vs 6.62% in NP pigs) percentages. In conclusion, PR pigs grew more in the second period of trial; this is can be related to the greater lipid deposition pointed out by the higher lard and inner subcutaneous backfat percentages of PR pigs. However, further analysis should be carried out to determine the intramuscular fat deposition, which is expected to be the main parameter affected by protein restriction.
Effects of protein restricted diet on in vivo performances and slaughtering traits of Cinta Senese pigs / Aquilani, Chiara; Sirtori, Francesco; Franci, Oreste; Crovetti, Alessandro; Pugliese, Carolina. - In: ITALIAN JOURNAL OF ANIMAL SCIENCE. - ISSN 1828-051X. - ELETTRONICO. - 16:(2017), pp. 62-62.
Effects of protein restricted diet on in vivo performances and slaughtering traits of Cinta Senese pigs.
AQUILANI, CHIARA;SIRTORI, FRANCESCO;FRANCI, ORESTE;CROVETTI, ALESSANDRO;PUGLIESE, CAROLINA
2017
Abstract
The aim of the study was to investigate the protein restriction effect on Cinta Senese pigs reared outdoor. Twenty-Two Cinta Senese pigs (13 barrows and 9 females), weighting averagely 38 kg, were equally divided in 2 groups. One group (NP) was fed with a 12% of crude protein (CP) diet, while the second (PR) with a protein restricted diet (9% of CP). After 5 months, the 2 groups were fed with the same diet (10% of CP). Pigs were weighted every 3 weeks; the average daily gain (ADG) and the feed conversion index (FCI) were calculated. Six hours after slaughtering, carcass weight and percentage of the main cuts were detected on the right side. On a loin sample joint (LS) (2th - 5th lumbar vertebra) the percentages of intermuscular fat, bone, inner and outer subcutaneous fat, lean, longissimus lumborum and psoas major muscles were determined. Data were analyzed by the analysis of variance (SAS). PR pigs, once fed with the 10% CP diet, showed an ADG from 5 months to slaughter of 0.496, which was significantly higher respect of that showed by NP pigs (0.443). Moreover, PR pigs resulted in a higher slaughtering weight (161.9 kg) than NP pigs (151.9 kg). Regarding the main cuts, the principal differences were found in loin and ribs percentage (14,12% in PR group and 15.93% in NP group) and in lard percentage, which showed an opposite trend, being higher (14.52%) in PR pigs than in NP pigs (11.69%). Examining LS tissue composition, protein restriction affected inner subcutaneous backfat (39.16% in PR pigs vs 33.31% in NP pigs) and psoas mayor (5.30% in PR group vs 6.62% in NP pigs) percentages. In conclusion, PR pigs grew more in the second period of trial; this is can be related to the greater lipid deposition pointed out by the higher lard and inner subcutaneous backfat percentages of PR pigs. However, further analysis should be carried out to determine the intramuscular fat deposition, which is expected to be the main parameter affected by protein restriction.
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