Relationships of Scrotal Circumference of Hanwoo Sire to Semen Characteristics and Conception Rate of Artificial Insemination in Farm
2010
Lee, S.S., Hanwoo Improvement Center, NACF, Seosan, Republic of Korea | Noh, S.H., Hanwoo Improvement Center, NACF, Seosan, Republic of Korea | Park, N.H., Hankyong National University, Ansung, Republic of Korea | Won, Y.S., Hanwoo Improvement Center, NACF, Seosan, Republic of Korea
The relationships of scrotal circumference (SC) to semen characteristics and the conception rate (70 days-nonreturn rate) of artificial insemination in farm were studied with 137 heads of bull in Hanwoo. The average and range of SC were 38.27±3.90 cm and 26.0~52.5 cm, respectively. Hanwoo bulls were classified with SC, divided into 34 cm below group, 34~39 cm group, and 39 cm over group. The 5,487 semen records of 43 heads of bull from July. 1. 2007 to June. 30. 2008. were used to determine the relationships between SC and semen characteristics. The semen concentration and total sperm number of each group were 11.18, 16.68, and 17.40×10∨8/ml, and 69.83, 101.64 and 114.40×10∨8/ejaculate. The bulls with 34 cm or more SC were higher than the bulls with 34 cm below in semen concentration and total sperm number (p less than 0.01). But between SC and semen volume have no significant relationship (p greater than 0.05). The 9,862 mating records of 44 farm with 137 heads of bull were used to determine the relationships between SC and conception rate. The conception rate of 1st artificial insemination were 73.31, 74.16, and 77.33 % in each group. Also SC was positively correlated with pregnancy rate (r=0.12, p=0.17). These results indicate that SC correlates positively with semen characteristics, and maybe with pregnancy rate in Hanwoo.
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