A trial was conducted to study the effect of sire line (Duroc (DU) and Pietrain (PI)) on carcass, meat and fat quality of pigs reared outdoor and destined to dry-cured meat production. No differences between sire genotypes were detected in carcass fat thickness ( P . 0.10) but carcasses from DU-sired pigs were longer ( P , 0.05) and tended to have a higher yield of trimmed shoulders ( P 5 0.07) and hams ( P 5 0.06) than carcasses from PI-sired pigs. Loins from DU-sired genotype showed higher ( P , 0.05) L* value and lower ( P , 0.01) a* value than loins from PI-sired genotype. Pork from DU-sired offspring tended to have higher ( P 5 0.09) intramuscular fat (IMF) percentage and lower ( P , 0.05) moisture proportion than meat from PI-sired offspring. Also, loins from DU-sired pigs had lower ( P , 0.001) thawing losses than loins from PI-sired pigs. The subcutaneous fat from the DU-sired line tended to show lower ( P 5 0.08) percentage of total polyunsaturated fatty acids (PUFAs) than that from the PI-sire line, mostly due to the higher proportion of C18:2 ( P 5 0.09) and C20:3 ( P , 0.01). However, no effect of crossbreed was detected on the total proportion of saturated, monounsaturated fatty acid (MUFAs) or PUFAs of IMF ( P . 0.10). We conclude that both sire lines can be used successfully under outdoor conditions but DU boars are more adequate than PI boars for the production of heavy pigs intended for the dry-cured meat industry.
Background Nutritional strategies for sows designed to reduce peripartum stress are suggested to support postpartum recovery and productivity. Spray-dried plasma (SDP) in sow feed has been reported to benefit sow and litter performance. Stressed animals fed diets with SDP have a more efficient immune response supporting animal recovery and health. The objectives of the present study using 452 sows (147 parity 1 sows, 148 parity 2 sows) were to determine if 0, 0.5 or 2.5% spray-dried porcine plasma (SDPP) in peripartum feed provided from entry in maternity through day 5 of lactation affects sow productivity and serological immune and oxidation status markers around parturition. Post-weaning sow productivity parameters including litter size at the next parturition was evaluated, but peripartum diets were only provided during the first parturition. Results In the first parturition, total born litter size was lower (P < 0.05) especially for sows allotted to the peripartum diet with 2.5% SDPP. Percentage of stillborn pigs decreased quadratically (P < 0.05) for sows fed 0.5% or 2.5% SDPP compared to 0% SDPP in peripartum feed and this result was not affected by total born litter size. Serum glutathione peroxidase activity linearly increased (P < 0.01) with increased dietary SDPP for both prepartum and postpartum sampling periods. In the next parturition, total born pigs from combined data of parity 1 and 2 sows linearly increased (P < 0.05) and live born pigs tended (P = 0.09) to linearly increase as level of SDPP increased and this result was not affected by total born litter size in the first parturition. The change in total and live born pigs from the first to the next parturition linearly (P < 0.01) increased as dietary SDPP increased for parity 1 and 2 sows. Conclusions The reduced percentage of stillborn pigs and increased litter size of parity 1 and 2 sows in the next parturition was independent of total born litter size in the first parturition suggesting SDPP in peripartum sow feed may have merit for reducing stillborn pigs and benefit litter size in the next parturition for parity 1 and parity 2 sows.
Background Nutritional strategies for sows designed to reduce stress around parturition are suggested to support postpartum recovery and longer-term productivity. Past studies using spray-dried plasma in sow feed reported productivity benefits in sow and litter performance. Other studies indicate stressed animals fed diets with spray-dried plasma have a more efficient immune response to the stress which supports animal recovery and health. The purpose of the present study was to determine if 0, 0.5 or 2.5% spray-dried porcine plasma (SDPP) in peripartum feed provided from entry in maternity through d 5 of lactation affects sow productivity and serological immune and oxidation status markers around parturition and if peripartum feed provided only during the initial parturition affected post-weaning sow productivity parameters including litter size of the next parturition. Results In the initial parturition, litter size for total born pigs was linearly reduced ( P < 0.05) as dietary SDPP increased and percentage of stillborn pigs per litter decreased quadratically ( P < 0.05) for sows fed 0.5% or 2.5% SDPP compared to 0% SDPP in peripartum feed. In the subsequent parturition, total born pigs from parity 1 and 2 sows linearly increased ( P < 0.05) and live born pigs tended ( P = 0.09) to linearly increase as level of SDPP increased. The change in total and live born litter size from the initial to the next parturition linearly ( P < 0.01) increased as dietary SDPP increased for parity 1 and 2 sows. Diet did not differ ( P > 0.10) for serum cytokine markers. Serum glutathione peroxidase activity linearly increased ( P < 0.01) with increased dietary SDPP for both prepartum and postpartum sampling periods. Conclusions Inclusion of SDPP in peripartum sow feed reduced percentage of stillborn pigs during the initial parturition and increased litter size of parity 1 and 2 sows in the next parturition. The reduced oxidation stress around parturition as indicated by increased serum glutathione peroxidase activity for sows fed SDPP in peripartum feed suggests mitigation of oxidation stress can reduce stillborn rate and have a long-term benefit on subsequent litter size for parity 1 and 2 sows.
Background: Nutritional strategies for sows designed to reduce peripartum stress are suggested to support postpartum recovery and productivity. Spray-dried plasma (SDP) in sow feed has been reported to benefit sow and litter performance. Stressed animals fed diets with SDP have a more efficient immune response supporting animal recovery and health. The objectives of the present study using 452 sows (147 parity 1 sows, 148 parity 2 sows) were to determine if 0, 0.5 or 2.5% spray-dried porcine plasma (SDPP) in peripartum feed provided from entry in maternity through day 5 of lactation affects sow productivity and serological immune and oxidation status markers around parturition. Post-weaning sow productivity parameters including litter size at the next parturition was evaluated, but peripartum diets were only provided during the first parturition. Results: In the first parturition, total born litter size was lower (P < 0.05) especially for sows allotted to the peripartum diet with 2.5% SDPP. Percentage of stillborn pigs decreased quadratically (P < 0.05) for sows fed 0.5% or 2.5% SDPP compared to 0% SDPP in peripartum feed and this result was not affected by total born litter size. Serum glutathione peroxidase activity linearly increased (P < 0.01) with increased dietary SDPP for both prepartum and postpartum sampling periods. In the next parturition, total born pigs from combined data of parity 1 and 2 sows linearly increased (P < 0.05) and live born pigs tended (P = 0.09) to linearly increase as level of SDPP increased and this result was not affected by total born litter size in the first parturition. The change in total and live born pigs from the first to the next parturition linearly (P < 0.01) increased as dietary SDPP increased for parity 1 and 2 sows. Conclusions: The reduced percentage of stillborn pigs and increased litter size of parity 1 and 2 sows in the next parturition was independent of total born litter size in the first parturition suggesting SDPP in peripartum sow feed may have merit for reducing stillborn pigs and benefit litter size in the next parturition for parity 1 and parity 2 sows.
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