Phase nutrition of calves with acidified milk replacer. 2. The level of rumen metabolism
1998
Vajda, V. | Demeterova, M. (Univerzita Veterinarskeho Lekarstva, Kosice (Slovak Republic)) | Zitnan, R. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic). Detasovane Pracovisko Kosice)
The effect of phase nutrition of calves on the development of their ruminal fermentation within the week leading to weaning was observed. A good level of ruminal fermentation was characterized by the values of total volatile fatty acids (VFA) in the ruminal content, ranging from 80.02 mmol/l in week 6 to 106.20 mmol/l in week 9 of life, with a statistically significant increase (P0.001) in weeks 7 and 8. The molar concentration portions of acetic and propionic acids insignificantly increased and those of butyric acid significantly (P0.01) decreased in week 9 of age. The enzymatic activity of alpha-amylase and C subx cellulase of the ruminal content of calves in the transitional period from milk to solid feed increased with aging of calves. The level of the alpha-amylase activity ranged within 3.87-5.6 nkat/ml. A significant increase was recorded in weeks 7 and 8 of life (P0.001 and P0.05 respectively). The cellulase activity of the ruminal content was found in the range of 1.6 - 3.6 with a significant increase of C subx cellulase in weeks 8 (P0.01) and 9 (P0.001). The results indicate a positive effect of phase nutrition on the development of ruminal metabolism in feeding the acidified milk replacer
显示更多 [+] 显示较少 [-]