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Milk production from diets of silage and dried forage. 3. Effect of formalin-treated ryegrass silage of high digestibility given ad libitum with and without urea

Published online by Cambridge University Press:  02 September 2010

J. C. Tayler ,
K. Aston  and
S. R. Daley
J. C. Tayler
Affiliation:
Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
K. Aston
Affiliation:
Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
S. R. Daley
Affiliation:
Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
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Abstract

1. Young adult and adult lactating British Friesian female cattle (heifers and cows) were individually fed ad libitum on perennial ryegrass silage (F) made with an additive of formic acid (3·41 of 85% acid/t fresh grass) or on a silage (FF) made from the same crop with an additive of 9·01/t of a mixture of equal volumes of formic acid and formalin (35% w/w solution of formaldehyde). Silage F was supplemented with a concentrate containing 50% dried grass and 50% barley at a low (L) or high (H) level of feeding; silage FF was supplemented with the same concentrate at the lower level only, either with urea at 2·0% of the silage DM (FFLU) or without urea (FFL).

2. Silage F had a lower pH (P< 0·001) and contained more lactic, acetic and total fermentation acids (P><0·001). The DOMD in vivo of the diet was lower (by up to 3 units) for treatment FFL than for the other treatments (P<0·05 in weeks 17 and 18).

3. Over weeks 4 to 18 of lactation the mean dry-matter intakes (DMI) of silage on treatments FL and FFL were similar, but silage DMI was 12 to 13% greater on treatment FFLU than on FL or FFL (P<0·05). Digestible OM intake was greater with FFLU than with FFL (P<0·01) and with FL (P<0·05).

4. Milk yields did not differ significantly between treatments and metabolic blood profiles were normal.

Type
Research Article
Information
Animal Production , Volume 28 , Issue 2 , April 1979 , pp. 171 - 181
Copyright
Copyright © British Society of Animal Science 1979

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References

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