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Nutritive value of barley and wheat whole crop silages at different stages of maturity for dairy cows 2. communication. feed intake and milk yield



Nutritive value of barley and wheat whole crop silages at different stages of maturity for dairy cows 2. communication. feed intake and milk yield



Wirtschaftseigene Futter 35(2): 187-199



In two experiments (Exp. 1 and Exp. II) whole crop silages of winter barley (WB), fed in Exp. I, and of winter wheat (WW), fed in Exp. II and each harvested at three different stages of maturity, were offered ad libitum together with 5 kg concentrate daily to a total of 36 dairy cows in each experiment (12 cows per treatment, Simmental or cross bred of Simmental .times. Red Holstein Friesian, mean live weight of 652 kg). The mean harvesting time of WB and WW varied from the middle to the end of the milky stage (WB 1, 28.8% DM; WW1, 33.5% DM), at the beginning of the doughy stage (WB 2, 36.6 DM; WW 2, 37.0% DM) and at the middle of the doughy stage 3, 43.5% DM). Detailed data of the chemical composition, digestibilities and energy contents of the silages and the silage quality have been given in the first paper. The mean daily feed intake per cow of WB 1 in Exp.1 was significantly lower than for WB2 and WB3 (10.9, 12.2 and 12.4 kg DM, respectively, P < 0.05). The average daily milk yield (17.1 kg FCM per cow) and average milk fat (4.32%) and protein content (3.67%) did not differ significantly between the treatments. In Exp. II similar amounts of roughage were eaten daily for treatments WW 1 and WW2 (11.0 and 11.4 kg DM per cow), while the daily feed intake of WW3 was significantly higher (13.0 kg DM, P < 0.05). Milk yield and milk fat content were not influenced by treatments and mean values across treatments were 17.1 kg FCM at 4.43% fat. The energy values (without concentrate) calculated gave maintenance plus 7.7, 9.3 and 8.7 kg of milk for treatments WB 1, WB2 and WB 3, respectively, and maintenanace plus 5.5, 6.1 and 7.5 kg of milk for treatments WW 1, WW 2 and WW 3, respectively.

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