[ Objective] This paper aimed to study the effects of different facilities on laying performance, egg quality and air quality for commercial layers under free range system. [Metbod] The single factorial arrangement wa...[ Objective] This paper aimed to study the effects of different facilities on laying performance, egg quality and air quality for commercial layers under free range system. [Metbod] The single factorial arrangement was used in the tdal. 2 800 commercial Beijing You Chicken （BYC） at 23 weeks of age were chosen and randomly divided into four groups, three replicates each group, and 210 birds each replicate. The layers lived in loose housing condition with deep litter inside. Group 1 was the control, equipped with standard laying boxes, and flat-type perches; group 2 was e- quipped with common laying boxes, and flat-type perches; group 3 was equipped with common laying boxes, and erect-type perches, and group 4 was equipped with standard laying boxes, and erect-type perches. The laying performance, laying position and egg quality of birds during 24 to 32 weeks of age were recorded and measured, and average NH3, CO~ concentration of each group at 32 weeks of age were measured and detected. [Result] The results showed that laying performance of commercial BYC under loose housing condition were significantly different during 24 -32 weeks of age. The laying rate of the control group equipped with flat-type porches and standard laying boxes （33.25%） was significantly higher than in group equipped with flat-type perches and common laying boxes （21.83%） （P〈0.05）, and other two groups （26.04% and 27.48%） （P 〈0.05）. The ratio of floor eggs was significantly lower in groups with standard laying boxes than in the groups with common laying boxes （P 〈0. 05）, and the laying proportion in the first floor of layer boxes were much higher than those in the second floor （ P 〈 0.05）. There were no significant differences on egg quality among the groups （P〉0.05）. Average NH3, CO2 concentration of group 3 and 4 at 82 weeks of age were both signifi- cantly higher than of group 1 and 2 （P 〈0.05）. [ Conclusion] All of the above indicated that the utilization of facilities could improve layer＇s laying rate, especially with flat-type perches and standard laying boxes, and the indoor air quality was also affected to some extent.展开更多
With the aging of society,special groups have had increasing needs of integrating into social life,and higher requirements on life quality,and the society has attached increasing importance to barrier-free design.Taki...With the aging of society,special groups have had increasing needs of integrating into social life,and higher requirements on life quality,and the society has attached increasing importance to barrier-free design.Taking public rental housing for example,both circulation space and furniture design have to fully consider needs of special groups such as the seniors and the disabled.Barrier-free design in living spaces can help improve their ability of self-care,reduce their dependence on family members,fully demonstrate the"human-centered"design concept of public rental housing,and show the designers’sense of social responsibility.展开更多
The Aquatic Quarantine Facility （AQF） for Litopenaeus vannamei established under the Department of Animal Husbandry, Dairying and Fisheries, Ministry of Agriculture is located on the eastern coastal region of Chenna...The Aquatic Quarantine Facility （AQF） for Litopenaeus vannamei established under the Department of Animal Husbandry, Dairying and Fisheries, Ministry of Agriculture is located on the eastern coastal region of Chennai in Tamil Nadu, India. The facility is an approved quarantine premise for the SPF vannamei broodstock imported across India and is probably the only one of its kind to be established in Southeast Asia. The centre is managed and operated by Rajiv Gandhi Centre for Aquaculture （RGCA）, a technical extension of the Marine Products Export Development Authority （MPEDA）, Ministry of Commerce ＆ Industry, Government of India. The quarantine facility functions on the basis of strict biosecurity protocol and as per the guidelines stipulated in Standard Operating Procedures （SOP） framed by a team of experts. The facility ensures specific pathogen free status of the SPF L. vannamei broodstock imported to India, thus playing key role in restricting the entry of diseases to the Country. This article presents the SPF certification process of the imported L. vannamei carried out at the facility.展开更多
基金supported by the National Natural Science Funds(No.30972128)Beijing Natural Scince Funds(No.6102010)
文摘[ Objective] This paper aimed to study the effects of different facilities on laying performance, egg quality and air quality for commercial layers under free range system. [Metbod] The single factorial arrangement was used in the tdal. 2 800 commercial Beijing You Chicken （BYC） at 23 weeks of age were chosen and randomly divided into four groups, three replicates each group, and 210 birds each replicate. The layers lived in loose housing condition with deep litter inside. Group 1 was the control, equipped with standard laying boxes, and flat-type perches; group 2 was e- quipped with common laying boxes, and flat-type perches; group 3 was equipped with common laying boxes, and erect-type perches, and group 4 was equipped with standard laying boxes, and erect-type perches. The laying performance, laying position and egg quality of birds during 24 to 32 weeks of age were recorded and measured, and average NH3, CO~ concentration of each group at 32 weeks of age were measured and detected. [Result] The results showed that laying performance of commercial BYC under loose housing condition were significantly different during 24 -32 weeks of age. The laying rate of the control group equipped with flat-type porches and standard laying boxes （33.25%） was significantly higher than in group equipped with flat-type perches and common laying boxes （21.83%） （P〈0.05）, and other two groups （26.04% and 27.48%） （P 〈0.05）. The ratio of floor eggs was significantly lower in groups with standard laying boxes than in the groups with common laying boxes （P 〈0. 05）, and the laying proportion in the first floor of layer boxes were much higher than those in the second floor （ P 〈 0.05）. There were no significant differences on egg quality among the groups （P〉0.05）. Average NH3, CO2 concentration of group 3 and 4 at 82 weeks of age were both signifi- cantly higher than of group 1 and 2 （P 〈0.05）. [ Conclusion] All of the above indicated that the utilization of facilities could improve layer＇s laying rate, especially with flat-type perches and standard laying boxes, and the indoor air quality was also affected to some extent.
文摘With the aging of society,special groups have had increasing needs of integrating into social life,and higher requirements on life quality,and the society has attached increasing importance to barrier-free design.Taking public rental housing for example,both circulation space and furniture design have to fully consider needs of special groups such as the seniors and the disabled.Barrier-free design in living spaces can help improve their ability of self-care,reduce their dependence on family members,fully demonstrate the"human-centered"design concept of public rental housing,and show the designers’sense of social responsibility.
文摘The Aquatic Quarantine Facility （AQF） for Litopenaeus vannamei established under the Department of Animal Husbandry, Dairying and Fisheries, Ministry of Agriculture is located on the eastern coastal region of Chennai in Tamil Nadu, India. The facility is an approved quarantine premise for the SPF vannamei broodstock imported across India and is probably the only one of its kind to be established in Southeast Asia. The centre is managed and operated by Rajiv Gandhi Centre for Aquaculture （RGCA）, a technical extension of the Marine Products Export Development Authority （MPEDA）, Ministry of Commerce ＆ Industry, Government of India. The quarantine facility functions on the basis of strict biosecurity protocol and as per the guidelines stipulated in Standard Operating Procedures （SOP） framed by a team of experts. The facility ensures specific pathogen free status of the SPF L. vannamei broodstock imported to India, thus playing key role in restricting the entry of diseases to the Country. This article presents the SPF certification process of the imported L. vannamei carried out at the facility.
