Effect of Monopropylene Glycol on Luteinizing Hormone, Metabolites, and Postpartum Anovulatory Intervals in Primiparous Dairy Cows

Percentage of cows cycling during the first 13 wk after calving. Heifers calved at BCS of 3.4 (BCH; n=13), 2.8 (BCL; n=17), and 2.8 drenched with monopropylene glycol (BCL + MPG; n=17) twice daily for 16 wk after calving.

Mean BCS and BW from 5 wk before until 11 wk after calving. Heifers calved at BCS of 3.4 (BCH; n=13), 2.8 (BCL; n=17), and 2.8 drenched with monopropylene glycol (BCL + MPG; n=17) twice daily for 16 wk after calving. Error bars represents the SEM.

Mean milk yield, fat, protein, and milk solids (kg) during the first 12 wk postpartum in heifers that calved at BCS of 3.4 (BCH; n=13), 2.8 (BCL; n=17), and 2.8 drenched with monopropylene glycol (BCL + MPG; n=17) twice daily for 16 wk after calving. Error bars represents the SEM.

Mean values for plasma glucose, insulin, growth hormone (GH), IGF-I, leptin, BHBA, and NEFA concentration from 3 wk before until 10 wk after calving in heifers that calved at BCS of 3.4 (BCH; n=13), 2.8 (BCL; n=17), and 2.8 drenched with monopropylene glycol (BCL + MPG; n=17). Error bars represents the SEM.

Mean LH pulse frequency at 2 and 5 wk after calving in heifers calving at BCS of 3.4 (BCH; n=13), 2.8 (BCL; n=17), and 2.8 drenched with monopropylene glycol (BCL + MPG; n=17) twice daily for 16 wk after calving. Error bars represents the SEM.