scholarly journals Interaction between feed use efficiency and level of dietary crude protein on enteric methane emission and apparent nitrogen use efficiency with Norwegian Red dairy cows1

2018 ◽  
Vol 96 (9) ◽  
pp. 3967-3982 ◽  
Author(s):  
Alemayehu Kidane ◽  
Margareth Øverland ◽  
Liv Torunn Mydland ◽  
Egil Prestløkken
Keyword(s):  
Methane Emission ◽  
Nitrogen Use Efficiency ◽  
Crude Protein ◽  
Nitrogen Use ◽  
Dietary Crude Protein ◽  
Enteric Methane ◽  
Use Efficiency

Whole-tract digestibility and nitrogen-use efficiency of partial mixed rations with and without canola meal

2017 ◽  
Vol 57 (7) ◽  
pp. 1398
Author(s):  
V. M. Russo ◽  
L. C. Marett ◽  
M. M. Wright ◽  
M. J. Auldist ◽  
W. J. Wales
Keyword(s):  
Milk Production ◽  
Nitrogen Use Efficiency ◽  
Crude Protein ◽  
Experimental Period ◽  
Canola Meal ◽  
Nitrogen Use ◽  
Dietary Nitrogen ◽  
Increase Milk Production ◽  
Use Efficiency ◽  
Grazing Dairy Cows

Increasing the crude protein (CP) concentration of a ration fed to grazing dairy cows by adding canola meal can increase milk production. The present study investigated the effect of extra CP intake on nitrogen-use efficiency and the fate of the additional dietary nitrogen (N). Sixteen spring-calved rumen fistulated cows were housed in metabolism stalls for a 9-day period and offered one of the following four treatment diets: (1) 8 kg DM/cow.day of fresh perennial ryegrass (PRG) supplemented with 12 kg DM/cow.day of a partial mixed ration (PMR) comprising oaten hay, crushed maize and wheat grain (PMR 8); (2) 12 kg DM/cow.day of fresh-cut PRG and 12 kg DM/cow.day of PMR (PMR 12); (3) the same as for PMR 8 cows, except some wheat in the PMR was replaced with canola meal (PMR+C 8); and (4) the same as the PMR 12 cows, except some wheat in the PMR was replaced with canola meal (PMR+C 12). The PMR and the PMR+C diets were iso-energetic, but the canola meal provided extra CP. Crude protein intake was 14.4%, 14.8%, 16.8% and 17.4% DM for PMR 8, PMR 12, PMR+C 8 and PMR+C 12 respectively. The addition of canola meal increased DM intake (P < 0.05) from 20.4 to 21.6 kg/day and increased N intake (P < 0.001) from 478 to 590 g/day. Nitrogen digestibility increased (P < 0.05) from 67% to 71%, nitrogen-use efficiency decreased (P < 0.05) from 37% to 32% and urinary-N output increased (P < 0.01) from 118 to 160 g/day, indicating that the additional CP fed resulted in additional N surplus. Energy-corrected milk yield for the experimental period was 34 ± 3.1 kg/cow.day (mean ± s.d.); however, due to the low number of cows, the ability to rigorously assess the effects on milk production was limited.

scholarly journals Reduction of crude protein in diets fed to lactating Holstein-Gyr cows

2018 ◽  
Vol 53 (7) ◽  
pp. 858-865
Author(s):  
Clóvis Ribeiro Guimarães ◽  
Rafael Alves de Azevedo ◽  
Mariana Magalhães Campos ◽  
Fernanda Samarini Machado ◽  
Alexandre Mendonça Pedroso ◽  
...  
Keyword(s):  
Nitrogen Use Efficiency ◽  
Crude Protein ◽  
Dry Matter ◽  
Nutrient Digestibility ◽  
Nitrogen Excretion ◽  
Productive Performance ◽  
Nitrogen Use ◽  
Use Efficiency ◽  
Urinary Nitrogen Excretion ◽  
Urinary Nitrogen

Abstract: The objective of this work was to evaluate the effect of reducing crude protein (CP) contents in diets with a constant metabolizable protein content on the intake, performance, nitrogen balance, and nutrient digestibility of lactating Holstein-Gyr cows. Animals (n = 24, 103±23 days in milk) were allocated to four treatments (n = 6 per group) with different CP contents: 127, 132, 139, and 156 g kg-1 dry matter (DM). DM intake was not affected by treatments. CP intake and digestibility increased linearly with higher CP contents. Milk yield (23.7±3 kg per day) and the percentages of milk protein (3.3±0.2%) and fat (3.8±0.5%) were not affected by CP reduction. Milk and blood urea nitrogen increased linearly with the increase of CP in the diet, similarly to urinary nitrogen excretion. Nitrogen use efficiency was 29.8 and 22.4% when CP was 127 and 156 g kg-1 DM, respectively. Reducing CP in diets fed to mid-lactating Holstein-Gyr cows increases nitrogen use efficiency and maintains the productive performance of the cows.

scholarly journals Opportunities for Increased Nitrogen Use Efficiency in Wheat for Forage Use

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1738
Author(s):  
Nirmal Sharma ◽  
Raquel Schneider-Canny ◽  
Konstantin Chekhovskiy ◽  
Soonil Kwon ◽  
Malay C. Saha
Keyword(s):  
Nitrogen Use Efficiency ◽  
Crude Protein ◽  
Nitrogen Nutrition ◽  
N Uptake ◽  
N Fertilization ◽  
Shoot Biomass ◽  
Total Biomass ◽  
Strong Positive Correlation ◽  
Nitrogen Use ◽  
Use Efficiency

Wheat is a major cool-season forage crop in the southern United States. The objective of this study is to understand the effect of nitrogen (N) fertilization on wheat biomass yield, quality, nitrogen use efficiency (NUE), and nitrogen nutrition index (NNI). The experiments were conducted in a greenhouse and a hoop house in a split-plot design, with three replications. Twenty wheat cultivars/lines were evaluated at four N rates (0, 75, 150, and 300 mg N.kg−1 soil) in the greenhouse and (0, 50, 100, and 200 mg N.kg−1 soil) in the hoop house. In general, high-NUE lines had lower crude protein content than the low-NUE lines. None of the cultivars/lines reached a plateau for biomass production or crude protein at the highest N rate. The line × N rate interaction for NUE was not significant in the greenhouse (p = 0.854) but was highly significant in the hoop house (p < 0.001). NNI had a negative correlation with NUE and biomass. NUE had strong positive correlations with shoot biomass and total biomass but low to moderate correlations with root biomass. NUE also had a strong positive correlation with N uptake efficiency. Lines with high NUE can be used in breeding programs to enhance NUE in wheat for forage use.

ROLE OF CONSERVATION AGRICULTURE IN IMPROVING PRODUCTION WATER AND NITROGEN EFFICIENCY OF WHEAT UNDER RAINFED CONDITIONS

2020 ◽  
Vol 51 (4) ◽  
pp. 1139-1148
Author(s):  
Othman & et al.
Keyword(s):  
Crop Rotation ◽  
Nitrogen Use Efficiency ◽  
Agricultural Research ◽  
Research Work ◽  
Conservation Agriculture ◽  
Nitrogen Efficiency ◽  
Research Station ◽  
Wheat Varieties ◽  
Nitrogen Use ◽  
Use Efficiency

The research work was conducted in Izra’a Research station, which affiliated to the General Commission for Scientific Agricultural Research (GCSAR), during the growing seasons (2016 – 2017; 2017 – 2018), in order to evaluate the response of two durum wheat verities (Douma3 and Cham5) and two bread wheat varieties (Douma4 and Cham6) to Conservation Agriculture (CA) as a full package compared with Conventional Tillage system (CT) under rainfed condition using lentils (Variety Edleb3) in the applied crop rotation. The experiment was laid according to split-split RCBD with three replications. The average of biological yield, grain yield,  rainwater use efficiency and nitrogen use efficiency was significantly higher during the first growing season, under conservation agriculture in the presence of crop rotation, in the variety Douma3 (7466 kg. ha-1, and 4162kg. ha-1, 19.006 kg ha-1 mm-1,  39.62 kg N m-2respectively). The two varieties Douma3 and Cham6 are considered more responsive to conservation agriculture system in the southern region of Syria, because they recorded the highest grain yields (2561, 2385 kg ha-1 respectively) compared with the other studied varieties (Cham5 and Douma4) (1951 and 1724 kg ha-1 respectively). They also exhibited the highest values of both rainwater and nitrogen use efficiency.

Grain Yield and Nitrogen Use Efficiency of Mid-seasonIndicaRice Cultivars Applied at Different Decades

2015 ◽  
Vol 41 (3) ◽  
pp. 422 ◽  
Author(s):  
Cheng-Xin JU ◽  
Jin TAO ◽  
Xi-Yang QIAN ◽  
Jun-Fei GU ◽  
Bu-Hong ZHAO ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrogen Use Efficiency ◽  
Nitrogen Use ◽  
Use Efficiency
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