Ryan, G.; Crosse, Seamus; Fitzgerald, S. (Teagasc, 1998-01-01)
In Experiment 1, three systems of milk production with
contrasting calving patterns, namely 100% autumn (A); 100%
spring (S) and 50% autumn: 50% spring (AS), were compared
over a two year period. The average milk yield was 6,532, 6,358
and 6,142 kg/cow for systems A, AS and S respectively. The
difference in yield was not statistically significant. Fat yield, fat
content and protein yield for system S was significantly lower than
those with the other two systems. The autumn-calving cows (A) had
reduced reproductive performance.
Experiment 2 compared grazed grass with grass silage as a
forage source for autumn-calving cows in early lactation; it
showed that the cows on grazed grass had significantly higher milk
protein yield and milk protein content. The cows on the grass silage
had significantly lower dry matter intake and a significantly higher
bodyweight loss post-calving.
The aim of this project was to develop low-cost systems of milk
production which lead to an improved milk supply pattern of quality
milk for the food industry. In particular, the objective was to
research the role which grazed grass can contribute to the feed
requirements of cows calving at different times during the year.
O'Riordan, Edward G.; O'Kiely, Padraig; Keane, Michael G. (Teagasc, 1998-11-01)
Documented data comparing both cutting and grazing grass growth
rates in Ireland are minimal. Most protocols for measuring grass
growth involve a cutting regime of either 3 or 4-week cycles. The
effect of the grazing animal is absent in most situations. However,
herbage production can readily be affected by the rate of fertiliser
nitrogen used and the frequency of grazing/cutting management
practices employed. The first two experiments reported here were
undertaken to assess grass growth under grazing and cutting
regimes and to determine the extent of differences which may arise
from different harvesting procotols. The third experiment investigated
the effect of nitrogen application rate and regrowth interval
on annual herbage production.
Early grazing: The experiments reported
here were conducted to examine the effects of early turnout to
grass on beef cattle production and on sward productivity. Autumn pasture production: The present series of experiments investigated the effects of
autumn closing dates on herbage yield and quality as well as their
effects on sward productivity. The effects of short and long grazing
rest intervals were evaluated in the context of autumn grass
growth and their effects on subsequent spring growth.
Nolan, T.; Grennan, Eamonn J. (Teagasc, 1998-11-01)
The objectives of the project were to compare different cultivar types and
methods to establish and maintain them in reseeded and permanent pastures
as a basis for efficient low cost sheep production. In Ireland only 3% of
pastures are reseeded annually and permanent pastures rarely contain more
than 5% white clover. Improved clover content offers benefits of higher
lamb growth rate and reduced fertiliser N use.
Comparisons under cutting conditions provided no basis for replacement of
Grasslands Huia by the new cultivar Aberherald. Grasslands Huia
established successfully following direct reseeding and rotational grazing by
sheep. It established more quickly than Kentish and gave higher yield only
in the first year. A mixture of small and medium size white clovers should
be sown for sheep grazing. Increasing seeding rate from 2 to 4 kg per ha
increased pasture clover content only in the first year. Grasslands Huia
persisted quite well for up to 5 years under rotational sheep grazing. It also
survived under continuous grazing but leaf size was reduced.
Rotational grazing management with sheep increased the clover content of
permanent pasture from under 2% to 4% over 2 years. Highest clover yields
were achieved with rest intervals of 20 to 28 days. Simulated mixed sheep
and cattle rotational grazing on permanent pasture resulted in intermediate
(10 to 12%) clover dry matter contributions to total dry matter compared
with cattle (15 to 18%) and sheep (5 to 8%). Lamb growth rate was about
35% higher when the clover content of the sward was increased from very
low to about 35%.
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