Recent investigatione on protein value of rapeseed products and their use in diets for dairy cows | Aktuelle Untersuchungen zum Proteinwert von Rapsnebenprodukten und deren Einsatz in Rationen für Milchkühe
2010
Steingass, H., Stuttgart. (Germany). Univ. Hohenheim. Inst. für Tierernährung. | Kneer, G. | Essig-Kozó, C. | Koch, C.
10 samples of rapeseed meal (RES) and 13 samples of rapeseed cake (RK) were used to determine rumen protein degradability using an in situ method. Content of crude protein in g/kg dry matter (DM) was 381 (min. 360-max. 401) in RES and 315 (289-344) in RK. Effective rumen protein degradation in % for a passage rate of 5 %/h was 59 (53-63) in RES and 88 (85-92) in RK. Hence content of undegraded feed protein in g/kg DM was 136 (103-168) and 37 (25-49) in RES and RK, respectively. In a feeding trial with 30 dairy cows, two lots of RES, one rumen protected meal and one normal RES, were compared with soybean meal as the only protein supplement. Neither in feed intake nor in milk production and contents of milk fat and protein significant differences were found between treatments, but a trend in favour of RES was observed. In a feeding trial with 60 dairy cows, RK was fed in high amounts of about 3.6 kg DM replacing soybean meal. The trial was arranged in 3 periods with RK or RK plus RES integrated in 4 control periods. In the periods with RK partially significant higher DM intake and milk production and lower milk fat and milk protein were observed. Even though RES and RK differ widely in their protein values, both feedstuffs can be regarded as suitable protein supplements in diets for dairy cows.
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