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Evaluation of gluconeogenic substances in fresh cows.

G. Desrousseaux



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Evaluation of gluconeogenic substances in fresh cows.
M. Norouzi1, G. Desrousseaux*2, B. M�dina3, A. Kalantari4, J.-F. Gabarrou2. 1Razavi Khorasan Agricultural and Natural Resources Research Center Mashhad, Iran, 2Phod� Terssac, France, 3Probiotech International Inc Ste-Hyacinthe, QC, Canada, 4Kimia Darou Mehr Tehran, Iran.

This study evaluated the effect of feeding glucose precursors to fresh dairy cows on body condition score (BCS), milk production and composition, metabolic and physiological status. Thirty-two dairy cows were randomly assigned to treatments in complete block design for 42 d post-calving. Treatments (300g/hd/d each) were: (1) Control (ground corn), (2) dry USP-grade glycerol powder, (3) a glycerol/glycol-based product, and (4) glycol added to daily diet. A mixed model (GLM) with repeated measurements was used to analyze the treatments effects on BCS, BW, milk composition and yield, and blood metabolites. Significant results were defined at P < 0.05 and tendency at P < 0.1 (SAS, 1998). The results showed that mean BW was not affected by treatments although group 2 mean BW was greater in wk 6 than in Control group (698.7 � 14 vs. 659 � 15 kg; P < 0.05). Body condition score and chest circumference did not differ between treatments even BCS was lower in Control group. Average milk yield was numerically higher in Group 2 than in other groups (42.2 vs. (1) 40.9, (3) 36.2 and (4) 40.2 kg/d). All supplements made milk protein yield increase compared with Control group (P < 0.05). It was numerically higher in group 2 (3.14% vs. (1) 2.99, (3) 3.01 and (4) 3.07). Data analysis showed plasma glucose concentration to be higher in Group 2 (P < 0.05) than in Control group and tended to be higher than those measured in the Groups 3 and 4 (P < 0.1). Blood urea was not affected by treatments. NEFA concentrations in Groups 2 and 4 were lower than those in Control group (0.340 and 0.384 vs. 0.578 mmol/L respectively; P < 0.05). Similar results were found for BHBA concentrations (0.441 and 0.440 vs. 0.75 mmol/L respectively; P < 0.05). Immune cell concentrations in blood were significantly lower in Group 2 (white blood cells, neutrophils, lymphocytes and monocytes) compared with Groups 3 and 4. The overall results suggest that feeding USP-grade glycerol supplement (300 g/hd/d) in fresh dairy cows may help to combine good metabolic status and performance. Further research is needed with more numerous animals including intake measurements.

Keywords: Holstein fresh cows, glucose precursor, milk performance.