Developing ecological scale breeding of local chickens with natural conditions, such as forest lands, grass lands, orchards and mulberry fields, not only can improve the quality of poultry products and the production ...Developing ecological scale breeding of local chickens with natural conditions, such as forest lands, grass lands, orchards and mulberry fields, not only can improve the quality of poultry products and the production benefits of chicken breeding, but also can develop and use local chicken germplasm effectively and promote their breed protection and industrialization. From integration and application of breed selection, breeding management, nutrient regulation, grass planting and grazing, a new ecological scale breeding technique of local chickens is proposed.展开更多
[Objective]The paper was to compare the slaughter performance and meat flavor of quality chicken under cage rearing and free-range farming conditions.[Method]A total of 4001-day-old cocks,S07 line cultivated by Sichua...[Objective]The paper was to compare the slaughter performance and meat flavor of quality chicken under cage rearing and free-range farming conditions.[Method]A total of 4001-day-old cocks,S07 line cultivated by Sichuan Dahen Poultry Breeding Co.,Ltd.(bred for 4 succes-sive generations),were kept in cages until the end of 5 weeks of age,which were then divided into cage rearing and free-range farming groups.All cocks were fed with the same diet,and slaughter tests and meat quality analysis were carried out at the end of 10 and 22 weeks of age,respectively.[Result]The live weight,carcass weight and abdominal fat percentage in cage rearing group were significantly higher than those in free-range farming group(P<0.01),and the percentage of half-eviscerated yield and percentage of eviscerated yield in cage rearing group were significantly higher than those in free-range farming group(P<0.05),but there were no significant differences in dressing percentage,percentage of leg muscle and per-centage of breast muscle.The intramuscular fat(IMF)content and muscle fiber density of chicken in cage rearing group were significantly higher than those in free-range farming group(P<0.01),but there was no significant difference in inosinic acid(IMP)content.The content of IMF and IMF increased with the increase of feeding age,but the deposition rate of intramuscular fat was higher than that of IMF in late feeding period.[Conclusion]The study will provide reliable guidance for production and market consumption of high quality chicken.展开更多
PCDD/Fs contamination of free-range chicken eggs and soils from private Vietnam households was studied.The possibility of using free-range eggs as bio-indicators of dioxin contamination was considered as the soil-chic...PCDD/Fs contamination of free-range chicken eggs and soils from private Vietnam households was studied.The possibility of using free-range eggs as bio-indicators of dioxin contamination was considered as the soil-chicken-egg exposure pathway is considered to be the most sensitive exposure pathway of dioxins in soils to humans.A large territory from Dong Nai province in the south to Lao Cai province in the north was covered by the research.All analyses were performed by HRGC-HRMS method.PCDD/Fs levels in eggs from the majority of southern households exceeded the EC limit for eggs and egg products(2.5 pg WHO-TEQ2005 g^-1 lipid).Total TEQs ranged from 0.4 to 361 pg WHO-TEQ2005 g^-1 lipid in eggs and from 0.1 to 1272 pg WHO-TEQ2005/g in soil.2,3,7,8-TCDD contribution was statistically significantly higher in both eggs and soils in sprayed with Agent Orange areas,indicating its long-term impact.In order to assess within site variation,a total of 62 individual eggs from 14 private households were analyzed.Mean relative standard deviation of total TEQ values in individual eggs within the separate households was 27%.Rather good correlation of PCDD/Fs concentration in eggs and respective soils was observed for all dioxin congeners and for hexa-and hepta-furans(except for 1,2,3,7,8,9-HxCDF).Higher bioaccumulation for lower chlorinated congeners was confirmed.The current study of using eggs as bioindicators for large POPs contaminated sites may be suggested as a policy approach to evaluate human exposure to dioxin/POPs contaminated sites for known or suspected contaminated areas.展开更多
基金Supported by Three New Agricultural Project in Jiangsu Province(SXGC[2013]234)
文摘Developing ecological scale breeding of local chickens with natural conditions, such as forest lands, grass lands, orchards and mulberry fields, not only can improve the quality of poultry products and the production benefits of chicken breeding, but also can develop and use local chicken germplasm effectively and promote their breed protection and industrialization. From integration and application of breed selection, breeding management, nutrient regulation, grass planting and grazing, a new ecological scale breeding technique of local chickens is proposed.
基金Supported by National Chicken Industry Research System of China(CARS-41-G04)Key R&D Program of Sichuan Province(2021YFN0029,2021YFYZ0031)Special Project of Financial Operation of Sichuan Province(SASA2020CZYX007)。
文摘[Objective]The paper was to compare the slaughter performance and meat flavor of quality chicken under cage rearing and free-range farming conditions.[Method]A total of 4001-day-old cocks,S07 line cultivated by Sichuan Dahen Poultry Breeding Co.,Ltd.(bred for 4 succes-sive generations),were kept in cages until the end of 5 weeks of age,which were then divided into cage rearing and free-range farming groups.All cocks were fed with the same diet,and slaughter tests and meat quality analysis were carried out at the end of 10 and 22 weeks of age,respectively.[Result]The live weight,carcass weight and abdominal fat percentage in cage rearing group were significantly higher than those in free-range farming group(P<0.01),and the percentage of half-eviscerated yield and percentage of eviscerated yield in cage rearing group were significantly higher than those in free-range farming group(P<0.05),but there were no significant differences in dressing percentage,percentage of leg muscle and per-centage of breast muscle.The intramuscular fat(IMF)content and muscle fiber density of chicken in cage rearing group were significantly higher than those in free-range farming group(P<0.01),but there was no significant difference in inosinic acid(IMP)content.The content of IMF and IMF increased with the increase of feeding age,but the deposition rate of intramuscular fat was higher than that of IMF in late feeding period.[Conclusion]The study will provide reliable guidance for production and market consumption of high quality chicken.
文摘PCDD/Fs contamination of free-range chicken eggs and soils from private Vietnam households was studied.The possibility of using free-range eggs as bio-indicators of dioxin contamination was considered as the soil-chicken-egg exposure pathway is considered to be the most sensitive exposure pathway of dioxins in soils to humans.A large territory from Dong Nai province in the south to Lao Cai province in the north was covered by the research.All analyses were performed by HRGC-HRMS method.PCDD/Fs levels in eggs from the majority of southern households exceeded the EC limit for eggs and egg products(2.5 pg WHO-TEQ2005 g^-1 lipid).Total TEQs ranged from 0.4 to 361 pg WHO-TEQ2005 g^-1 lipid in eggs and from 0.1 to 1272 pg WHO-TEQ2005/g in soil.2,3,7,8-TCDD contribution was statistically significantly higher in both eggs and soils in sprayed with Agent Orange areas,indicating its long-term impact.In order to assess within site variation,a total of 62 individual eggs from 14 private households were analyzed.Mean relative standard deviation of total TEQ values in individual eggs within the separate households was 27%.Rather good correlation of PCDD/Fs concentration in eggs and respective soils was observed for all dioxin congeners and for hexa-and hepta-furans(except for 1,2,3,7,8,9-HxCDF).Higher bioaccumulation for lower chlorinated congeners was confirmed.The current study of using eggs as bioindicators for large POPs contaminated sites may be suggested as a policy approach to evaluate human exposure to dioxin/POPs contaminated sites for known or suspected contaminated areas.
