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Addition of fat to concentrate mixtures for dairy cows

, : Addition of fat to concentrate mixtures for dairy cows. Saertrykk, Institutt for Husdyrnaering of Foringslaere (401): 208-212

The following 4 series of experiments are described: (i) comparing concentrates plus 4% hardened marine fat (HMF) plus or minus 0.4% methionine hydroxy analogue, using grass silage plus or minus cobs as roughage (4 groups of 5 cows); (ii) comparing concentrates with 0, 4 or 8% HMF of 48 deg C mp, the roughage being silage + swedes (18 cows); (iii) a similar experiment to (ii), but with silage + straw as roughage (18 cows); (iv) comparing concentrate with 4% HMF (43-45 deg C mp) and concentrate with 10.7% rapeseed (4% rapeseed oil), using silage and straw as roughage (16 cows). In most experiments the addition of HMF to concentrates was associated with a tendency to higher daily milk yields but lower 4%-FCM yields (on account of lower fat content). It is suggested therefore that not more than 4% HMF should be added to concentrates, preferably HMF of high mp (>42-43 deg C). In all experiments, milk from cows receiving HMF in concentrates tended to have fewer flavour defects than that from cows receiving no HMF.


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