Effect of oral glycerol on the lactation performance of dairy cows in postpartum period
2011
Kass, M., Bio-Competence Centre of Healthy Dairy Products, Tartu (Estonia);Estonian Univ. of Life Sciences, Tartu (Estonia) | Ariko, T., Estonian Univ. of Life Sciences, Tartu (Estonia) | Ots, M., Bio-Competence Centre of Healthy Dairy Products, Tartu (Estonia);Estonian Univ. of Life Sciences, Tartu (Estonia) | Arney, D., Estonian Univ. of Life Sciences, Tartu (Estonia) | Kaert, O., Estonian Univ. of Life Sciences, Tartu (Estonia)
The treatment of ketosis with glycerol was first introduced in the 1950s. Currently, the availability of glycerol as a feed supplement for dairy cattle has increased due to the rapid expansion of the biodiesel industry. It has been suggested that glycerol can be used as a dietary glucose precursor for dairy cows in a similar way to propylene glycol. This study examined the effect of orally administrated crude glycerol on milk production and composition, and energy-status related blood metabolites of primiparous (n=4) and multiparous (n=4) Holstein dairy cows in the first three weeks of lactation. The treatment group cows were given an oral drench of 500 mL of crude glycerol once a day before the morning feeding. Long-term oral drenching of crude glycerol had no effect on dry matter intake (DMI), but there was a positive effect on milk yield. Most milk composition values were not affected by the treatment, but treatment groups had lower milk protein levels. Blood glucose and insulin concentrations were declined with glycerol administration.
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