부산대학교 도서관

The present experiment was conducted to evaluate the effect of two different beats {100 and 150 BPM (Beat Per Minute)} of musical sound signals {intensity below 85 dB(decibel)} on reproductive performance of Hariana bulls maintained at semen biology lab of DDD (District Dairy Demonstration) Farm within the premises of Instructional Livestock Farm Complex (ILFC). The present experiment was carried out for an aggregate time period of three and half months (within autumn season) and was accomplished in three phases. Same four Hariana bulls were used as experimental animals in three different phases of experiments to avoid individual effect of bulls as well as to overcome the limitations of limited numbers of bulls. During the first (control) phase of experiment the bulls were not exposed to any additional source of sound (T1) except the normal environmental sound in the semen collection area. In second and third phase, bulls were exposed to a musical instrumental sound signal of 100 (T2) and 150 (T3) BPM with intensity below 85 dB. Each phase of the experiment was done for a period of one month (four weeks) one after another in continuation but the third phase was started after a gap of three weeks from the second in order to cancel out the persistent effect of sound exposure to bulls during second phase of investigation. The effect of exposure of sound signals on volume (6.58±0.29) ml, concentration (1018.72±49.92) millions/ ml, mass (3.98±0.07) and progressive motility (72.97±0.80%), head (1.93±0.21%), middle piece (0.63±0.15%), and tail (2.56±0.28%) of sperm and HOST (79.22±0.69) was highly significantly better (P<0.01), with an exposure of a sound signal of 150 BPM with intensity below 85 dB. [ABSTRACT FROM AUTHOR]