Influence of electromagnetic stimulation on secreting oxytocin and milk production in dairy cows under the heat stress
The release of oxytocin (OT) and milk ejection are most important for rapid and complete milk secretion and production. Inhibition of OT release and decrease in milk production has been observed in dairy cows during heat stress. The influence of electromagnetic stimulation (EMS) of whole body on the concentration of OT in the blood and milk yield in Holstein cows during a moderate heat stress has been tested. The study includes an experimental (n=30) and a control (n=30) group of cows. Experimental animals were affected by a unique bio-informational EMS protocol of three weeks duration. Heat stress leads to decrease in milk production in control but not in experimental group of cows. The significantly higher (p<0.001) concentration of OT in the blood and higher milk production (p<0.05) was found in the experimental group. Dynamic changes in the concentration of OT and milk produced during the experiment show positive correlation (R2=0.31; p<0.01) in experimental but not in control group of cows. EM stimulation showed tendency (R2=0.08; p<0.1) to increase milk production despite the rise in the temperature humidity index (stress load) in experimental, but not in control dairy cows. This needs further research with rigor experimental protocol.