دورية أكاديمية
Nitrogen balance and milk composition of dairy cows fed urea and soybean meal and two protein levels using sugar cane based diets
| العنوان: | Nitrogen balance and milk composition of dairy cows fed urea and soybean meal and two protein levels using sugar cane based diets |
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| المؤلفون: | Luís Henrique Andreucci Conti, Elmeson Ferreira de Jesus, Angélica Simone Cravo Pereira, Marcos André Arcari, Kleber da Cunha Peixoto Junior, Francisco Palma Rennó, Marcos Veiga dos Santos |
| المصدر: | Brazilian Journal of Veterinary Research and Animal Science, Vol 51, Iss 3 (2014) |
| بيانات النشر: | Universidade de São Paulo, 2014. |
| سنة النشر: | 2014 |
| المجموعة: | LCC:Animal culture |
| مصطلحات موضوعية: | Blood parameter, Dairy cows, Microbial protein synthesis, Soybean meal, Urea, Animal culture, SF1-1100 |
| الوصف: | The aim of the study was to evaluate the effect of feeding two levels of crude protein (CP) (low: 142 g CP/kg DM; and high: 156 g CP/kg DM) and two nitrogen sources (soybean meal and urea) to dairy cows using sugar cane as forage on microbial protein synthesis, the composition of the milk nitrogen fraction, nitrogen (N) balance and blood parameters. Twelve Holstein cows with an average milk yield of 22.0 ± 2.3 kg/day, and with 235 ± 40 days in milk were included in this study. The animals were grouped into three balanced and contemporary 4x4 Latin squares for an experimental period of 21 days. On the 15th day of each period, milk and urine samples were collected for microbial protein synthesis determination. Total excretion of urine (L/day), milk urea nitrogen (MUN) and blood urea were higher for the diets with high CP, regardless of the nitrogen source. Nitrogen efficiency was higher for cows fed diets with low CP. Cows in the final third of lactation can be fed diets with reduced CP levels, regardless of the nitrogen source, soybean meal or urea, without influencing the synthesis of microbial protein or the composition of the nitrogen fraction of milk. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Portuguese |
| تدمد: | 1678-4456 1413-9596 |
| Relation: | http://www.revistas.usp.br/bjvras/article/view/74381; https://doaj.org/toc/1413-9596; https://doaj.org/toc/1678-4456 |
| DOI: | 10.11606/issn.1678-4456.v51i3p242-251 |
| URL الوصول: | https://doaj.org/article/58dec04fa2d542219068cd3d28a1c942 |
| رقم الأكسشن: | edsdoj.58dec04fa2d542219068cd3d28a1c942 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16784456 14139596 |
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| DOI: | 10.11606/issn.1678-4456.v51i3p242-251 |