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- W2353120265 abstract "Feed phosphorus(P)input of dairy production in China and the sequent releases play an important role in the China's dairy production and environmental risk management.In this study,in situinformation including feeds,feeding schedule,herd structure,milk production and manure management of many intensive and collective dairy operations were tracked to investigate the difference among two production modes.Results indicated that,among the intensive and collective operations,the former operation had relatively stable feed P contents(average 0.38% with variation coefficient of 13.71%).Although the average was in agreement with the recommendation(0.38%-0.42%),20% of the intensive dairy operations hadgreater and 30% of the intensive dairy operations had smaller feed P content than the recommendation.While for the collective dairy operation in China,the average feed P content was0.45%,which was greater than the recommendation and was associated with greater variation of 25.21%.Most importantly,about 61% of the collective operations had greater and 23% of them had smaller feed P contents than the recommendation hinted that only 16% of the collective operations were characterized with reasonable feed P contents.Further analysis indicated that the average ratio of concentrate-roughage for intensive dairy operations was 60∶40,and69%and 31% of the feed P were contributed by concentrate and roughage,respectively.Whereas the concentrate-roughage ratio of collective operations was 50∶50,and 57% and 43% of the total feed P were derived from the concentrate and roughage,respectively.Meanwhile,the average P use efficiency during lactation period(LUE,305d)and one year(AUE,365d)of intensive operations were estimated to be 30.6%and 27.9%,which were about 7.8and 7.1percentage points greater than the LUE and AUE for collective operations." @default.
- W2353120265 created "2016-06-24" @default.
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- W2353120265 date "2015-01-01" @default.
- W2353120265 modified "2023-10-01" @default.
- W2353120265 title "Phosphorus use efficiencies and balances of lactating cows in collective and intensive dairy operations in Hebei" @default.
- W2353120265 hasPublicationYear "2015" @default.
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