| dc.creator | Keim,Juan Pablo | |
| dc.creator | Anrique,René | |
| dc.date | 2011-12-01 | |
| dc.date.accessioned | 2019-04-24T21:19:16Z | |
| dc.date.available | 2019-04-24T21:19:16Z | |
| dc.identifier | https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400019 | |
| dc.identifier.uri | http://revistaschilenas.uchile.cl/handle/2250/55657 | |
| dc.description | Grazing dairy cows are characterized by converting a low proportion of dietary N into milk N. This low N use efficiency (NUE) is mainly due to an excessive supply of crude protein (CP) of pasture with regard to animal requirements. Excess N in the diet has negative effects for the animal; it alters the organoleptic characteristics of milk and pollutes the environment through N excretions. The aim of this review was to analyze the available information on nutritional strategies to improve NUE by grazing dairy cows, such as diluting the dietary N through supplementation, synchronizing ruminal carbohydrate (CHO), and N fermentation rates, and using pastures with a high water soluble carbohydrates (WSC) content. There is a beneficial effect of carbohydrate supplementation on NUE, with an increase in milk yield (MY) of 0.83 ± 0.34 kg milk kg-1 supplement and a reduction of ammonia N (NH3-N) in the rumen. A better synchrony between CHO and rumen N does not improve MY and NUE. However, a positive effect on NUE was identified as a result of increasing the WSC/CP ratio. The use of cultivars with high WSC content increases the dry matter intake (DMI), MY, and milk N production, with no consistent effect on NUE. | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Instituto de Investigaciones Agropecuarias, INIA | |
| dc.relation | 10.4067/S0718-58392011000400019 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source | Chilean journal of agricultural research v.71 n.4 2011 | |
| dc.subject | Concentrate supplementation | |
| dc.subject | ruminal synchrony | |
| dc.subject | high sugar ryegrass | |
| dc.subject | crude protein | |
| dc.subject | milk production | |
| dc.title | Nutritional Strategies to Improve Nitrogen use Efficiency by Grazing Dairy Cows | |
