What question did this study set out to answer?

To evaluate how different levels of daily concentrate supplementation and herbage allowance affect pasture intake and herbage substitution rates in grazing dairy cattle.

March 1, 1984Grass and Forage Science

Concentrate supplementation of grazing dairy cows

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To evaluate how different levels of daily concentrate supplementation and herbage allowance affect pasture intake and herbage substitution rates in grazing dairy cattle.
Assigned 24 spring-calving Dutch Friesian cows to six grazing treatments in a 2 × 3 factorial design over two grazing seasons (16 weeks in 1981, 18 weeks in 1982).
Tested two daily herbage organic matter (OM) allowances (16 and 24 kg/cow above 4 cm) across perennial ryegrass swards and three daily concentrate OM intakes (0.8, 3.2, and 5.6 kg/cow).
Measured herbage intake using a two-machine sward-cutting technique with adjustments for herbage growth during 3-to-4-day grazing intervals.
The impact of concentrate supplementation on herbage intake differed significantly between herbage allowance levels.
At the 16 kg OM allowance, daily herbage OM intake was 10.9, 10.6, and 10.4 kg/cow at concentrate intakes of 0.8, 3.2, and 5.6 kg/cow, yielding a mean substitution rate of 0.1.
At the 24 kg OM allowance, daily herbage OM intake was 14.8, 13.6, and 12.4 kg/cow at concentrate intakes of 0.8, 3.2, and 5.6 kg/cow, producing a mean substitution rate of 0.5 kg herbage OM per kg concentrate OM.

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Implication

Factorial experiment reveals herbage allowance regulates concentrate substitution rates in grazing dairy cows, indicating higher pasture displacement occurs under generous grazing allowances.

Cite This Study

Meijs et al. (1984) studied this question.

synapsesocial.com/papers/6a8545d2f76e40547ac2b2ca https://doi.org/10.1111/j.1365-2494.1984.tb01665.x

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Implication

Factorial experiment reveals herbage allowance regulates concentrate substitution rates in grazing dairy cows, indicating higher pasture displacement occurs under generous grazing allowances.

Concentrate supplementation of grazing dairy cows

Key Points

Discussion

Implication

Cite This Study

Concentrate supplementation of grazing dairy cows

Key Points

Discussion

Implication

Cite This Study

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