Effects of Grazing Dairy Cows on Bt and Non-Bt Cotton Crop Residues on the Ratios of each Ruminal Acetate and Propionate to Milk Palmitic Acid and the Correlation of both Ratios to Acetate to Propionate in Gezira State, Sudan
Keywords:milk yield, molar proportion, cows grazed, Cotton, crop residues
The objective of this experiment was to investigate milk yield and mean molar proportion of Acetic (Mol\100Mol) to Palmitic (g\100g) and mean molar proportion of Propionic (Mol/100mol) to Palmitic (g\100g) acids. Milk from cows grazed on Bt and non-Bt cotton crop residues (CCR). Cows were milked once a day by employing full hand milking, put in individual bottle, weigh, recorded, after weigh each group was collected and stored in separate tanks. ( Bt and non- Bt) Immediately after reaching the tank, it was cooled labeled around 3°C. Milk sample from each cow was collected at week 0 (Before introduction of animals for grazing), 1, 2, 3, 4 and 5 during the 5 weeks of experimental feeding. The collected milk was frozen and then transferred to the University of Gezira Laboratories for chemical analysis. The results revealed significant differences in milk yield mean molar proportion of Acetate (Mol\100Mol) to Palmitic acid (g\100g) and mean molar proportion of Propionic (Mol/100mol) to Palmitic (g\100g), it was found to be higher in Bt CCR than in non-Bt CCR in all weeks of the grazing period, Also milk yield was significantly (P<0.01) higher in animals grazed on Bt than that non-Bt.
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