Nitrogen utilization efficiency and prediction of nitrogen excretion in sheep offered fresh perennial ryegrass (Lolium perenne)1

2016 ◽  
Vol 94 (12) ◽  
pp. 5321-5331 ◽  
Author(s):  
Y. G. Zhao ◽  
A. W. Gordon ◽  
N. E. O'Connell ◽  
T. Yan
Keyword(s):  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Nitrogen Utilization ◽  
Utilization Efficiency ◽  
Nitrogen Excretion ◽  
Nitrogen Utilization Efficiency

scholarly journals Effect of Different Tannin Sources on Nutrient Intake, Digestibility, Performance, Nitrogen Utilization, and Blood Parameters in Dairy Cows

Animals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 507 ◽  
Author(s):  
Zhang ◽  
Xu ◽  
Cao ◽  
Wang ◽  
Yang ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Nutrient Intake ◽  
Control Diet ◽  
Nitrogen Retention ◽  
Blood Parameters ◽  
Nitrogen Utilization ◽  
Utilization Efficiency ◽  
Nitrogen Excretion ◽  
Nitrogen Utilization Efficiency ◽  
Dietary Treatments

This study investigated the effect of tannin sources on nutrient intake, digestibility, performance, nitrogen utilization, and blood parameters in lactating dairy cows. Four multiparous lactating Holstein cows were used in a balanced 4 × 4 Latin square design, with each period lasting 28 days. Cows were randomly assigned to one of four dietary treatments: Control diet (CON, a totally mixed ration without tannin supplements), control diet supplemented with 3% bayberry condensed tannins (BCT), control diet supplemented with 3% Acacia mangium condensed tannins (ACT), and control diet supplemented with 3% valonia hydrolyzed tannins (VHT). Dietary treatments did not significantly affect nutrient intake, milk yield or composition, microbial protein synthesis, nitrogen utilization efficiency, or plasma concentrations of glucose, non-esterified fatty acids, β-hydroxybutyrate, total protein, and globulin, or the albumin-to-globulin ratio. Tannin supplements decreased the apparent total tract nutrient digestibility to varying degrees and significantly decreased the milk and blood urea nitrogen contents (p < 0.05). Tannin supplements altered nitrogen excretion routes in lactating dairy cows, and BCT significantly decreased the urinary nitrogen excretion (p = 0.04). Compared with the CON, ACT, and VHT diets, BCT yielded the highest nitrogen retention and nitrogen retention-to-digestible nitrogen ratio despite having a similar nitrogen utilization efficiency (p < 0.05). Bayberry condensed tannin supplementation may be a potential way to improve nitrogen utilization and reduce concerns regarding nitrogen excretion in dairy cows.

Late harvest improves yield and nitrogen utilization efficiency of summer maize

2019 ◽  
Vol 232 ◽  
pp. 88-94 ◽  
Author(s):  
Zheng Liu ◽  
Jia Gao ◽  
Fei Gao ◽  
Peng Liu ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Nitrogen Utilization ◽  
Utilization Efficiency ◽  
Summer Maize ◽  
Nitrogen Utilization Efficiency
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