Results 21 to 30 of about 1,355,564 (244)

Identification of Genomic Regions Influencing N-Metabolism and N-Excretion in Lactating Holstein- Friesians

Frontiers in Genetics, 2021
Excreted nitrogen (N) of dairy cows contribute to environmental eutrophication. The main N-excretory metabolite of dairy cows is urea, which is synthesized as a result of N-metabolization in the liver and is excreted via milk and urine. Genetic variation
Hanne Honerlagen, Henry Reyer, Michael Oster, Siriluck Ponsuksili, Nares Trakooljul, Björn Kuhla, Norbert Reinsch, Klaus Wimmers, Klaus Wimmers   +8 more
doaj   +1 more source

Validation of models for predicting milk urea nitrogen concentrations, estimating dry matter intake by the NRC (2001)

Revista Brasileira de Zootecnia, 2012
The objective of this study was to validate three different models for predicting milk urea nitrogen using field conditions, attempting to evaluate the nutritional adequacy diets for dairy cows and prediction of nitrogen excreted to the environment ...
Paula Marques Meyer, Paulo Fernando Machado, Arlei Coldebella, Laerte Dagher Cassoli, Karyne Oliveira Coelho, Paulo Henrique Mazza Rodrigues   +5 more
doaj   +1 more source

Nitrogen Metabolism in Lactating Goats Fed with Diets Containing Different Protein Sources [PDF]

Asian-Australasian Journal of Animal Sciences, 2014
This study aimed to evaluate urea excretion, nitrogen balance and microbial protein synthesis in lactating goats fed with diets containing different protein sources in the concentrate (soybean meal, cottonseed meal, aerial part of cassava hay and ...
A. B. Santos, M. L. A. Pereira, H. G. O. Silva, M. S. Pedreira, G. G. P. Carvalho, L. S. O. Ribeiro, P. J. P. Almeida, T. C. J. Pereira, J. V. Moreira   +8 more
doaj   +1 more source

Effects of polymer-coated slow-release urea on performance, ruminal fermentation, and blood metabolites in dairy cows

Revista Brasileira de Zootecnia, 2015
The objective of this experiment was to quantify the effects of feeding polymer-coated slow-release urea on nutrient intake and total tract digestion, milk yield and composition, nutrient balances, ruminal fermentation, microbial protein synthesis, and ...
Gustavo Delfino Calomeni, Rodrigo Gardinal, Beatriz Conte Venturelli, José Esler de Freitas Júnior, Thiago Henrique Annibale Vendramini, Caio Seiti Takiya, Heraldo Namorato de Souza, Francisco Palma Rennó   +7 more
doaj   +1 more source

Short-term physiological responses to moderate heat stress in grazing dairy cows in temperate climate

Animal, 2023
Even in temperate climate regions, an increase in ambient temperature and exposure to solar radiation can cause heat stress in lactating dairy cows. We hypothesised that grazing dairy cows exhibit short-term physiological changes due to increasing heat ...
A. Pontiggia, A. Münger, S. Ammer, C. Philipona, R.M. Bruckmaier, N.M. Keil, F. Dohme-Meier   +6 more
doaj   +1 more source

Fourier Transform Infrared Spectroscopy (FTIR) for MUN analysis in normal and adulterated Milk

Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2012
The objective of this study was to evaluate the CombiScope FTIR equipment based on Fourier Transform Infrared methodology (FTIR), to assess the content of milk urea nitrogen (MUN) in Brazil.
M.C.P.P. Oliveira, N.M.A. Silva, L.P.F. Bastos, L.M. Fonseca, M.M.O.P. Cerqueira, M.O. Leite, R.S. Conrrado   +6 more
doaj   +1 more source

Modelling Animal Systems Paper: Update of the Dutch protein evaluation system for ruminants: the DVE/OEB2010 system [PDF]

, 2011
In the current Dutch protein evaluation system (the DVE/OEB1991 system), two characteristics are calculated for each feed: true protein digested in the intestine (DVE) and the rumen degradable protein balance (OEB).
Dijkstra, J., Blok, M.C., Vuuren, A.M., van, Bannink, A., Cone, J.W., Tamminga, S., Duinkerken, G., van   +6 more
core   +1 more source

MILK PRODUCTION AND NITROGEN EXCRETION BY DAIRY COWS IN LATE LACTATION FED CUT PASTURES OF DIFFERENT RYEGRASS – CLOVER SPECIES IN SMALL-SCALE DAIRY SYSTEMS

Tropical and Subtropical Agroecosystems, 2021
Background: Nitrogen (N) plays an important role in dairy systems, both in production costs and as an indicator of environmental impact. Objective: The objective was to investigate the effects on milk production and nitrogen excretion by dairy cows fed ...
Maria Danaee Celis Alvarez, Carlos Manuel Arriaga Jordán, Manuel González Ronquillo, Aurora Sainz Ramírez, Gonzalo Flores Calvete, Felipe López González   +5 more
doaj   +1 more source

Effect of farm system and milk urea phenotype on milk yield and milk composition of dairy cows in Canterbury [PDF]

, 2021
To investigate the effect of farm system, and cow selection for milk urea nitrogen (MUN), on milk yield and milk composition, a farmlet study was carried out between October 2018 and May 2019 in Lincoln, Canterbury. A farm system with a low stocking rate
Robic, Y, Curtis, Jeff, Al-Marashdeh, Omar, Handcock, Rhiannon, Bryant, Racheal, O’Conner, P, Hague, Helen   +6 more
core  

Milk urea nitrogen concentration is higher in Brown Swiss than in Holstein dairy cows despite identical feeding. [PDF]

, 2020
Milk urea nitrogen (MUN) content is closely related to blood urea nitrogen (BUN) concentration and reflects the balance of dietary crude protein and energy supply for ruminal microbial metabolism.
Kessler, Evelyne C, Gross, Josef J., Evelyne C. Kessler, Bruckmaier, Rupert M, Josef J. Gross, Rupert M. Bruckmaier   +5 more
core   +1 more source