Increased concentration of water-soluble carbohydrate in perennial ryegrass (Lolium perenne L.): milk production from late-lactation dairy cows

2001 ◽  
Vol 56 (4) ◽  
pp. 383-394 ◽  
Author(s):  
L. A. Miller ◽  
J. M. Moorby ◽  
D. R. Davies ◽  
M. O. Humphreys ◽  
N. D. Scollan ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Water Soluble ◽  
Soluble Carbohydrate ◽  
Lolium Perenne L ◽  
Water Soluble Carbohydrate

Milk production from dairy cows offered perennial ryegrass selected for high water soluble carbohydrate concentrations compared to a control grass

1999 ◽  
Vol 1999 ◽  
pp. 208-208 ◽  
Author(s):  
L. A. Miller ◽  
M. A. Neville ◽  
D. H. Baker ◽  
R. T. Evans ◽  
M. K. Theodorou ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Perennial Ryegrass ◽  
Microbial Population ◽  
High Water ◽  
Water Soluble ◽  
Soluble Carbohydrate ◽  
Holstein Friesian ◽  
Elevated Water ◽  
Water Soluble Carbohydrate

The efficiency of grass nitrogen utilisation for milk production tends to be low, due partly to the slow rate of release of energy in the rumen which reduces the efficiency of capture of rapidly degradable plant proteins by the rumen microbial population. When additional sugars are infused into the rumen, microbial protein production is increased (Rooke et al., 1987). The objective of this study was to assess milk production using a grass variety that has been bred to express elevated water soluble carbohydrate (WSC) concentrations.Eight multiparous Holstein-Friesian dairy cows in mid lactation (176 days ± s.e. 3.6) were used in a continuous design, zero-grazing experiment. Following covariate measurements taken from all animals on a standard grazing diet, four animals were each offered one of two varieties of perennial ryegrass at ad libitum rate: AberDove, bred to express high WSC concentrations; and AberElan, a commercially available variety, used as a control.

Effects of upland pastures sown with two contrasting Lolium perenne varieties on the performance of beef steers when compared to steers grazing permanent pastures

2005 ◽  
Vol 2005 ◽  
pp. 194-194
Author(s):  
C. L. Marley ◽  
D. A. Davies ◽  
J. E. Vale ◽  
J. G. Evans ◽  
N. D. Scollan ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Lolium Perenne ◽  
White Clover ◽  
High Water ◽  
Water Soluble ◽  
Production Performance ◽  
Soluble Carbohydrate ◽  
Beef Steers ◽  
Water Soluble Carbohydrate

Grazing experiments have shown that using a ryegrass (Lolium perenne L.) variety bred by conventional techniques for high water-soluble carbohydrate (WSC) concentrations can improve liveweight gain in pre-weaned lambs (Lee et al., 2001) and increase milk yields and reduce N excretion in dairy cows (Miller et al., 2001) compared to conventional ryegrass. The aim of this study was to determine the effects of using reseeded upland pastures, sown with either a ryegrass variety bred for elevated levels of WSC or a control ryegrass on the production performance of grazing steers when compared to steers grazing permanent ryegrass/white clover pastures.

Growth and carbon partitioning in perennial ryegrass (Lolium perenne) cultivars selected for high water-soluble carbohydrate concentrations

2002 ◽  
Vol 138 (4) ◽  
pp. 375-385 ◽  
Author(s):  
K. F. SMITH ◽  
R. A. CULVENOR ◽  
M. O. HUMPHREYS ◽  
R. J. SIMPSON
Keyword(s):  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
High Water ◽  
Carbon Partitioning ◽  
Water Soluble ◽  
Yield Potential ◽  
Soluble Carbohydrate ◽  
Root Mass ◽  
Shoot Ratio ◽  
Water Soluble Carbohydrate

Perennial ryegrass (Lolium perenne L.) cultivars with increased water-soluble carbohydrate (WSC) concentrations were evaluated under controlled environment conditions. The growth and carbon partitioning of these cultivars was compared with standard cultivars during vegetative growth. The high WSC cultivars had shoot growth rates that were not significantly different from the standard cultivars, confirming that the extra WSC in these cultivars was not made available through reductions in yield potential. The extra WSC stored in these cultivars coincided with lower concentrations of neutral detergent fibre in the dry matter. When the cultivars were grown in hydroponic solution the high WSC cultivars Aurora and Ba10727 were found to also have less root mass and a lower root[ratio ]shoot ratio than the standard cultivars. However, this trait was not consistent across all high WSC cultivars with Cariad having the same root[ratio ]shoot ratio as the standard cultivars at the end of the experiment. The reduction in the root mass of the cultivars Aurora and Ba10727 was far greater than necessary to provide the extra carbon stored as WSC in these cultivars. The implications of these results for the breeding of cultivars of perennial ryegrass with increased WSC concentrations are discussed.

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