scholarly journals Genetic parameters of blood urea nitrogen and milk urea nitrogen concentration in dairy cattle managed in pasture-based production systems of New Zealand and Australia

2021 ◽  
Author(s):  
Irene van den Berg ◽  
Phuong N. Ho ◽  
Mekonnen Haile-Mariam ◽  
Phil R. Beatson ◽  
Erin O'Connor ◽  
...  
Keyword(s):  
New Zealand ◽  
Dairy Cattle ◽  
Blood Urea Nitrogen ◽  
Genetic Parameters ◽  
Production Systems ◽  
Nitrogen Concentration ◽  
Urea Nitrogen ◽  
Milk Urea ◽  
Milk Urea Nitrogen

scholarly journals Animal as the Solution: Searching for Environmentally Friendly Dairy Cows

2021 ◽  
Vol 13 (18) ◽  
pp. 10451
Author(s):  
Cameron J. Marshall ◽  
Pablo Gregorini
Keyword(s):  
Dairy Cows ◽  
Selective Breeding ◽  
Production Systems ◽  
Environmentally Friendly ◽  
Methane Emissions ◽  
Potential Solution ◽  
Urea Nitrogen ◽  
Breeding Values ◽  
Milk Urea ◽  
Milk Urea Nitrogen

There is increasing societal concern surrounding the environmental externalities generated from ruminant production systems. Traditional responses to address these externalities have often been system-based. While these approaches have had promising results, they have served to view the animal as a problem that needs solving, rather than as a potential solution. This review attempts to answer the question: can we breed animals that are more environmentally friendly to address environmental outcomes and satisfy consumer demand? This was done by exploring the literature of examples where animals have been specifically bred to reduce their environmental impact. The use of milk urea nitrogen breeding values has been demonstrated as a tool allowing for selective breeding of dairy cows to reduce nitrogen losses. Low milk urea nitrogen breeding values have been documented to result in reduced urinary nitrogen concentrations per urination event, which ultimately reduces the level of nitrogen that will be lost from the system. The ability to breed for low methane emissions has also shown positive results, with several studies demonstrating the heritability and subsequent reductions in methane emissions via selective breeding programs. Several avenues also exist where animals can be selectively bred to increase the nutrient density of their final product, and thus help to address the growing demand for nutrient-dense food for a growing human population. Animal-based solutions are permanent, cumulative, and often more cost-effective than system-based approaches. With continuing research and interest in breeding for more positive environmental outcomes, the animal can now start to be viewed as a potential solution to many of the issues faced by ruminant production systems, rather than simply being seen as a problem.

scholarly journals Milk Urea Nitrogen Concentration: Heritability and Genetic Correlations with Reproductive Performance and Disease

2005 ◽  
Vol 88 (12) ◽  
pp. 4434-4440 ◽  
Author(s):  
R.G. Mitchell ◽  
G.W. Rogers ◽  
C.D. Dechow ◽  
J.E. Vallimont ◽  
J.B. Cooper ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Nitrogen Concentration ◽  
Genetic Correlations ◽  
Urea Nitrogen ◽  
Milk Urea ◽  
Milk Urea Nitrogen

scholarly journals Estimation of Genetic Parameters for Concentrations of Milk Urea Nitrogen

2003 ◽  
Vol 86 (7) ◽  
pp. 2462-2469 ◽  
Author(s):  
G.M. Wood ◽  
P.J. Boettcher ◽  
J. Jamrozik ◽  
G.B. Jansen ◽  
D.F. Kelton
Keyword(s):  
Genetic Parameters ◽  
Urea Nitrogen ◽  
Milk Urea ◽  
Estimation Of Genetic Parameters ◽  
Milk Urea Nitrogen

scholarly journals Prediction of ammonia emission from dairy cattle manure based on milk urea nitrogen: Relation of milk urea nitrogen to ammonia emissions

2010 ◽  
Vol 93 (6) ◽  
pp. 2377-2386 ◽  
Author(s):  
S.A. Burgos ◽  
N.M. Embertson ◽  
Y. Zhao ◽  
F.M. Mitloehner ◽  
E.J. DePeters ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Cattle Manure ◽  
Ammonia Emission ◽  
Ammonia Emissions ◽  
Urea Nitrogen ◽  
Milk Urea ◽  
Milk Urea Nitrogen
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