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Abstract

The objective of this work was to evaluate whether changes in time of herbage allocation and herbage mass (HM) (low (L) or medium (M)) modify the diurnal pattern of urinary nitrogen (N) concentration and ruminal ammonia (NH3) of lactating dairy cows. Four Holstein-Friesian cows fitted with rumen...

Author(s)
Beltran, I. E.; Gregorini, P.; Daza, J.; Balocchi, O. A.; Morales, A.; Pulido, R. G.
Publisher
MDPI AG, Basel, Switzerland
Citation
Animals, 2019, 9, 11, pp 961
AbstractFull Text

Knowledge about the size and cycle of inorganic N pool on grasslands is necessary to develop adequate fertilization strategies and to determine the potential pathways of N losses. The objectives of this study were to: (1) quantify the N mineralization rates in permanent grassland on an Andosol of...

Author(s)
Martínez-Lagos, J.; Salazar, F.; Alfaro, M.; Rosas, M.; Macías, F.
Publisher
Chilean Society of Soil Science, Temuco, Chile
Citation
Journal of Soil Science and Plant Nutrition, 2015, 15, 1, pp 60-75
AbstractFull Text

This publication contains eight papers that discuss the following topics: (i) effect of potassium/sodium ratio in the pasture on ingestive behaviour of dairy cows; (ii) water-soluble carbohydrate and nitrogen concentrations after defoliation in perennial ryegrasses (Lolium perenne) in spring; (iii) ...

Publisher
Facultad de Ciencias Agrarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Agro Sur, 2016, 44, 3, pp 1-87
Abstract

In order to develop a general model of aboveground net primary production (ANPP) of herbaceous communities in grazing systems that combine forested and open grasslands in temperate areas, biomass production and a set of biotic and abiotic variables were measured at four adjacent forest and...

Author(s)
Sánchez-Jardón, L.; Acosta-Gallo, B.; Pozo, A. del; Casado, M. A.; Ovalle, C.; Miguel, J. M. de
Publisher
Springer, Amsterdam, Netherlands
Citation
Agroforestry Systems, 2014, 88, 3, pp 397-411
AbstractFull Text

Most of the studies on nitrogen (N) leaching have been carried out on cut grass, and there is a lack of information on beef grazed grasslands. The objective of this study was to quantify N runoff and leaching losses in beef production systems with two different immediate stocking rates (63 and 191...

Author(s)
Salazar, F.; Alfaro, M.; Ledgard, S.; Iraira, S.; Teuber, N.; Ramírez, L.
Publisher
Chilean Society of Soil Science, Temuco, Chile
Citation
Journal of Soil Science and Plant Nutrition, 2011, 11, 2, pp 97-108
Abstract

Studies were conducted to describe and evaluate the dynamics of bulk tank (LE) somatic cell counts (RCS), milk urea nitrogen (NUL), fat and protein and to analyse their association with reproductive indices, considering monthly LE samples from 187 farms (∼12 000 dairy cows at any time) in...

Author(s)
Pinedo, P. J.; Meléndez, P.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2010, 42, 1, pp 41-48
Abstract

Dairy slurry is an important plant nutrient source. However, mismanagement (e.g. high application rate) can lead to nutrient losses to the wider environment. There are few data on slurry management and its effect on nitrogen (N) losses specific to Southern Chile, although existing studies suggest...

Author(s)
Salazar, F.; Martínez-Lagos, J.; Alfaro, M.; Misselbrook, T.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Agriculture, Ecosystems & Environment, 2012, 160, pp 23-28
Abstract

The high content of crude protein (CP) of pastures in southern Chile creates a nutritional imbalance that results in large amount of nitrogen (N) being excreted into the environment. Two regression equations and a dynamic model, available from the literature, were utilized to simulate the N use...

Author(s)
Arias, R. A.; Velásquez, A.; Toneatti, M.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2013, 45, 2, pp 125-134
AbstractFull Text

The objective of this study was to determine if the supplementation with two carbohydrate sources that have different degradation rates, reduces the ammonia production by ruminal bacteria by increasing the nitrogen capture in dairy cows grazing high protein contents pastures. Four dairy cows fitted ...

Author(s)
Manterola, H. B.; Carreño, N. G.; Orellana, M. C.; González, H. V.; Cerda, D. A.
Publisher
Instituto de Zootecnia, Facultad de Veterinaria, Córdoba, Spain
Citation
Archivos de Zootecnia, 2013, 62, 240, pp 491-499
Abstract

The main inputs and outputs of nitrogen (N) and phosphorus (P) in soils and swards under typical Southern Chilean conditions were determined between 2004-2005 and 2006-2007 to establish soil and field gate N and P balances under different immediate stocking rates (63 and 191 anim ha-1 d-1) and...

Author(s)
Alfaro, M.; Salazar, F. S.; Oenema, O.; Iraira, S.; Teuber, N.; Ramirez, L.; Villarroel, D.
Publisher
Sociedad Chilena de la Ciencia del Suelo, Valdivia, Chile
Citation
Revista de la Ciencia del Suelo y Nutrición Vegetal, 2009, 9, 1, pp 40-54

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