دورية أكاديمية
Strategic grazing management decreases nitrogen excretion intensity of dairy cows
| العنوان: | Strategic grazing management decreases nitrogen excretion intensity of dairy cows |
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| المؤلفون: | Camila Delveaux Araujo Batalha, Guilhermo Francklin de Souza Congio, Flávio Augusto Portela Santos, Sila Carneiro da Silva |
| المصدر: | Scientia Agricola, Vol 79, Iss 2 (2021) |
| بيانات النشر: | Universidade de São Paulo, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Agriculture (General) |
| مصطلحات موضوعية: | canopy light interception, elephant grass, energy partitioning, nitrogen partitioning, pasture–based systems, Agriculture (General), S1-972 |
| الوصف: | ABSTRACT: There is limited information regarding both nitrogen (N) and energy partitioning of dairy cows grazing well–managed tropical pastures. The objective of this study was to investigate the N and energy partitioning of mid–lactation dairy cows on rotationally grazed elephant grass using two pre–grazing targets: 95 % or maximum canopy light interception (LI95% or LIMax) during regrowth. The study used 26 Holstein × Jersey dairy cows arranged in a randomized complete block design with three 40–day periods of sampling. Grazing at LI95% increased organic matter and crude protein intake by 20 % (p ≤ 0.05) which resulted in a 9 % increase in fat corrected milk yield (p ≤ 0.05) relative to LIMax. Cows grazing at LI95% had greater concentration of total volatile fatty acids, butyrate and valerate (p ≤ 0.05), and smaller acetate (p ≤ 0.05) than those grazing at LIMax. Intake of net energy for lactation (NEL) and NEL secreted in milk were greater (p ≤ 0.05), while partitioning of NEL towards maintenance tended to be greater (p = 0.07) for cows grazing at LI95% than those grazing at LIMax. Milk urea nitrogen and both urine and fecal N excretion were greater for cows grazing at LI95% (p ≤ 0.05), but N excretion intensity was lower than in cows grazing at LIMax (p ≤ 0.05). Strategic grazing management using the LI95% pre–grazing target increases N losses through both urine and feces; however, it reduces N excretion intensity of dairy cows by 9 %. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Spanish; Castilian Portuguese |
| تدمد: | 1678-992X 1678-992x |
| العلاقة: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000201601&tlng=enTest; https://doaj.org/toc/1678-992XTest |
| DOI: | 10.1590/1678-992x-2020-0251 |
| الوصول الحر: | https://doaj.org/article/812f7f82ec934f188c3ec0ce948c35d6Test |
| رقم الانضمام: | edsdoj.812f7f82ec934f188c3ec0ce948c35d6 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 1678992X 1678992x |
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| DOI: | 10.1590/1678-992x-2020-0251 |