EFFECT OF FEEDING DIFFERENT LEVELS OF CORN SILAGE ON MILK COMPOSITION OF FRIESIAN COWS. | ||
| Journal of Animal and Poultry Production | ||
| Article 8, Volume 29, Issue 5, May 2004, Pages 2371-2381 PDF (615.91 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2004.239166 | ||
| Authors | ||
| A. M. A. Mohi EI·Din,; Manal A. Naeim | ||
| Animal Production Research Institute, Agricultural Research Center, Egypt | ||
| Abstract | ||
| Eighteen lactating Friesian cows at different lactation seasons were taken one month pre-partum and divided into 3 similar groups. (G1) control was fed 25% corn silage (CS) on OM basis, (G2) was fed 50% corn silage and (G3) was fed 75% corn silage. Results showed that silage fermentation characteristics (pH, TFVA, ammonia nitrogen (NH3-N) and fractions of VFAs) were almost within the normal ranges reported for good quality silage. Also, it was indicated that increasing level of CS in rations significantly (P<0.05) increased pH and decreased VFAs and NH3-N in rumen liquor. Cows in G3 showed the highest average daily milk yield (ADMY) followed by G2 and G1 at all lactation periods. Maximum ADMY was observed between 30 and 60 days of lactation period in all groups. Milk fat content showed inconsistent trend in all groups and showed the maximum fat content at 60 days of lactation period. Protein content showed the highest values at the beginning of lactation, thereafter decreased in all groups. Lactose content was almost higher in G3 and G2, than G1 at all lactation times. As a results of increasing fat, protein and lactose contents in milk in G2 and G3 total, solids content was higher in G3 and G2, respectively at all lactation times. Total concentrations of TVFA, NCN, NPN were significantly not affected by feeding treatments. | ||
| Keywords | ||
| Friesian cows; com silage; rumen function; milk composition | ||
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