Effect of propylene glycol on energy balance and fertility in dairy cows | ผลของโพรไพลีนไกลคอลต่อสมดุลของพลังงานและความสมบูรณ์พันธุ์ในแม่โคนม
2009
Theera Rukkwamsuk(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Department of Large Animals and Wildlife Clinical Sciences) E-mail:[email protected] | Adisorn Yawongsa(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Department of Large Animals and Wildlife Clinical Sciences) | Wandee Thiangthum(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Department of Large Animals and Wildlife Clinical Sciences)
Effect of propylene glycol on energy balance and fertility was studied in 35 control cows (drenched with 400 ml of plain water per cow per day) and 43 treated cows (drenched with 400 ml of propylene glycol per cow per day) during 7 days before expected calving date to 7 days after calving. Blood samples were collected at 2 wk before expected calving date and 1, 2, 4, 6 and 12 wk after calving to determine concentrations of glucose, nonesterified fatty acids, triacylglycerol and urea nitrogen in the blood. Milk yields were recorded and milk samples were collected to determine milk composition. Body condition scores and heat detection were also recorded. Results of body condition scores showed control cows lose more body condition scores than treated cows. Milk yields and milk composition did not differ between control and treated cows. After calving, blood concentrations of nonesterified fatty acids at 1 and 2 wk postpartum for control cows were higher than for treated cows. Blood glucose, triacylglycerol and urea nitrogen concentrations did not differ between the two groups. Control cows had a longer period from calving to first detected estrus as compared to treated cows. Average days from calving to first detected estrus were 103+-19.1 days and 60.2+-6.1 days for control and treated cows, respectively. Propylene glycol had an advantage to reduce negative energy balance postpartum, as a consequence, treated cows responded to reduce fat mobilization. Although, propylene glycol administration did not improve milk yield and composition, shorten days from calving to first estrus might be an advantage to increase conception rate of postpartum dairy cows.
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