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KMID : 1025520030450040517
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Journal of Animal Science and Technology
2003 Volume.45 No. 4 p.517 ~ p.522
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Relationship Between Scrotal Circumference and Semen Production and Reproductive Performance in Hanwoo Bulls
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박노형/Park, N. H.
이성수/정준/원유석/김내수/Lee, S. S./Jeong, J./Won, Y. S./Kim, N. S.
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Abstract
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Scrotal measurements and semen production records of 19,742 during 7 years from 63 Hanwoo breeding bulls (6~7 years of age were used to determined the relationship between scrotal circumference(SC) and semen production including concentration and total number of sperm. The average of SC is 41.2±4.54㎝； extreme ranges between a low of 34㎝ to a high of 48㎝. Quantity of semen, concentration and total number of sperm are 5.47±0.89㎖／ejaculation, 16.16±2.78×10 EXP^(8)／㎖ and 88.47±15.24×10 EXP^(8)／ejaculation, respectively. SC is positively correlated with semen production(0.14 with quantity of semen and 0.15 with total number of sperm). Reproduction data from 16 breeding bulls produced 1,289 offspring from spring 1993 to spring 2000 to examined relationship between SC and reproduction. Rate of fertility and delivery are 0.80±0.13 and 0.78±0.15, respectively. Also, SC is positively correlated with delivery rate(r＝0.26) and favorably related to fertility rate(r＝0.39). These results, that is, - SC correlates positively with semen production and with reproduction -, suggested that SC should be considered when selecting breeding bull.
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KEYWORD
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