Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations

L. A. Miller; D. H. Baker; Michael K. Theodorou; John C. MacRae; Mervyn O. Humphreys; Nigel D. Scollan; Jon M. Moorby

Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations

L. A. Miller, D. H. Baker, Michael K. Theodorou, John C. MacRae, Mervyn O. Humphreys, Nigel D. Scollan, Jon M. Moorby

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This experiment is one of a series designed to investigate the efficiency of nitrogen (N) use in Holstein-Friesian dairy cows grazing perennial ryegrass (Lolium perenne) which has been bred to express high water soluble carbohydrate (WSC) concentrations. Animals grazed either a High Sugar (HS) grass or a Control (C) variety chosen on the basis of heading date compatibility. Dry matter (DM) intakes were estimated using herbage mass. Milk yields, milk constituent concentrations and plasma concentrations of b-hydroxybutyrate, glucose, total protein, albumin and urea were also measured. Forage DM intakes were similar for the two grasses. However, because of differences in the nitrogen content of the varieties (128 vs 176 g crude protein (CP) kg-1 DM; s.e.d. 10.5; P

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@conference{60e4ad9b5c064e12b88fbfcbb5384238,

title = "Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations",

abstract = "This experiment is one of a series designed to investigate the efficiency of nitrogen (N) use in Holstein-Friesian dairy cows grazing perennial ryegrass (Lolium perenne) which has been bred to express high water soluble carbohydrate (WSC) concentrations. Animals grazed either a High Sugar (HS) grass or a Control (C) variety chosen on the basis of heading date compatibility. Dry matter (DM) intakes were estimated using herbage mass. Milk yields, milk constituent concentrations and plasma concentrations of b-hydroxybutyrate, glucose, total protein, albumin and urea were also measured. Forage DM intakes were similar for the two grasses. However, because of differences in the nitrogen content of the varieties (128 vs 176 g crude protein (CP) kg-1 DM; s.e.d. 10.5; P",

author = "Miller, {L. A.} and Baker, {D. H.} and Theodorou, {Michael K.} and MacRae, {John C.} and Humphreys, {Mervyn O.} and Scollan, {Nigel D.} and Moorby, {Jon M.}",

note = "Miller, L. A., Baker, D. H., Theodorou, M. K., MacRae, J. C., Humphreys, M. O., Scollan, N. D., Moorby, J. M. (2001). Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations. Grassland Ecosystems: An Outlook into the 21st Century. Proceedings 19th International Grassland Congress, Sao Paulo, Brazil, 10-21 February 2001, Gomide, J. A.Mattos, W. R. S.Carneiro da Silva, S. Fundacao Estudos Agrarios Luiz Queiroz (Fealq), Piracicaba, ISBN:8571330107, 377-378",

year = "2001",

language = "English",

pages = "10--21",

}

TY - CONF

T1 - Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations

AU - Miller, L. A.

AU - Baker, D. H.

AU - Theodorou, Michael K.

AU - MacRae, John C.

AU - Humphreys, Mervyn O.

AU - Scollan, Nigel D.

AU - Moorby, Jon M.

N1 - Miller, L. A., Baker, D. H., Theodorou, M. K., MacRae, J. C., Humphreys, M. O., Scollan, N. D., Moorby, J. M. (2001). Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations. Grassland Ecosystems: An Outlook into the 21st Century. Proceedings 19th International Grassland Congress, Sao Paulo, Brazil, 10-21 February 2001, Gomide, J. A.Mattos, W. R. S.Carneiro da Silva, S. Fundacao Estudos Agrarios Luiz Queiroz (Fealq), Piracicaba, ISBN:8571330107, 377-378

PY - 2001

Y1 - 2001

N2 - This experiment is one of a series designed to investigate the efficiency of nitrogen (N) use in Holstein-Friesian dairy cows grazing perennial ryegrass (Lolium perenne) which has been bred to express high water soluble carbohydrate (WSC) concentrations. Animals grazed either a High Sugar (HS) grass or a Control (C) variety chosen on the basis of heading date compatibility. Dry matter (DM) intakes were estimated using herbage mass. Milk yields, milk constituent concentrations and plasma concentrations of b-hydroxybutyrate, glucose, total protein, albumin and urea were also measured. Forage DM intakes were similar for the two grasses. However, because of differences in the nitrogen content of the varieties (128 vs 176 g crude protein (CP) kg-1 DM; s.e.d. 10.5; P

AB - This experiment is one of a series designed to investigate the efficiency of nitrogen (N) use in Holstein-Friesian dairy cows grazing perennial ryegrass (Lolium perenne) which has been bred to express high water soluble carbohydrate (WSC) concentrations. Animals grazed either a High Sugar (HS) grass or a Control (C) variety chosen on the basis of heading date compatibility. Dry matter (DM) intakes were estimated using herbage mass. Milk yields, milk constituent concentrations and plasma concentrations of b-hydroxybutyrate, glucose, total protein, albumin and urea were also measured. Forage DM intakes were similar for the two grasses. However, because of differences in the nitrogen content of the varieties (128 vs 176 g crude protein (CP) kg-1 DM; s.e.d. 10.5; P

M3 - Paper

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EP - 21

ER -

Efficiency of nitrogen use in dairy cows grazing ryegrass with different water soluble carbohydrate concentrations

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