دورية أكاديمية
Methods for assessing phosphorus overfeeding on organic and conventional dairy farms
| العنوان: | Methods for assessing phosphorus overfeeding on organic and conventional dairy farms |
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| المؤلفون: | M. Nordqvist, K. Holtenius, R. Spörndly |
| المصدر: | Animal, Vol 8, Iss 2, Pp 286-292 (2014) |
| بيانات النشر: | Elsevier, 2014. |
| سنة النشر: | 2014 |
| المجموعة: | LCC:Animal culture |
| مصطلحات موضوعية: | dairy cow, phosphorus, faeces, organic management, Animal culture, SF1-1100 |
| الوصف: | Phosphorus (P) losses from dairy farms can severely damage aquatic ecosystems, so it is important to have tools to assess overfeeding of P. This study screened P intake and faecal excretion of different P fractions in dairy cows on conventional and organic farms, compared the P feeding level of the herds against the recommendations and analysed different sampling and analysis methods for assessing the general status of P feeding on the farms. The organic (n=14) and conventional farms (n=15) were of comparable size and were located in southern Sweden. On each farm, feed intake was registered for 10 cows representing four different lactation stages and their P intake was calculated and related to current recommendations. Faecal samples taken from the same cows were analysed for total P (TP) and soluble P. Milk production data for the cows were obtained from the Swedish official milk recording scheme. TP was determined in one slurry sample per farm. More than 70% of the cows studied, representing both conventional and organic herds, consumed P in excess of the recommendations. Conventional herds had higher P content in the ration than organic herds, and lactating cows in conventional herds had higher faecal concentrations of total and soluble P than those in organic herds. However in dry cows, the P content of the ration and soluble P and TP in faeces did not differ between the two management systems. Soluble P was well correlated to TP in faeces, and both were good indicators of P overfeeding. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1751-7311 17517311 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S1751731113002103; https://doaj.org/toc/1751-7311 |
| DOI: | 10.1017/S1751731113002103 |
| URL الوصول: | https://doaj.org/article/ba5c6b1b15184100b1b7f504c1475c59 |
| رقم الأكسشن: | edsdoj.ba5c6b1b15184100b1b7f504c1475c59 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 17517311 |
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| DOI: | 10.1017/S1751731113002103 |