Fat-rich rapeseed cake and oil in dairy cattle rations

Ilus, A.; Karis, V.; Vadi, M.; Hellenurme, E.

Proceedings of the Animal Nutrition Conference, 26-27 May, 1994 in Tartu, Estonia: 50-59


Accession: 002381067

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From 1 to 3 months of lactation, cows were given basal diets of hay, wilted silage, root crops and potatoes. Concentrates or cottonseed oilmeal were replaced with rapeseed meal (16% fat, glucosinolates 43.4 micro mol/g fat-free DM) 0, 1.0 and 2.0 kg in trials 1 and 2, respectively. Diets contained 3.4, 4.7 and 6.1, and 3.5, 4.8 and 6.3% fat. In both trials milk yield increased in cows supplemented with rapeseed meal. In further trials, cows were given the same basal diets as before, plus cottonseed oilmeal or rapeseed meal 2 kg for 30 days. Milk fat content was 3.99 and 3.90, and milk protein content 3.14 and 3.15%, respectively. Milk flavour was not affected. Optimum supplementary rapeseed oil was studied for 14-day periods in cows given concentrates, hay, silage, potato and rapeseed meal, without and with rapeseed oil 0.2 and 0.5 kg. Fat in DM was 2.78, 3.92 and 5.54%. Milk flavour and butter quality were not affected by inclusion of rapeseed oil 0.2, but butter quality was adversely affected when rapeseed oil 0.5 kg was given. In digestibility trials, mixed diets contained rapeseed oil 0.2 and 0.4 kg and rapeseed oilmeal 1.0 kg. Digestibilities of DM, organic matter and crude fibre decreased while those of crude fat increased. Feed intake decreased significantly and it was concluded that fat in DM should be <=6%.