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KMID : 0900920000240020209
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Korean journal of Animal Reproduction
2000 Volume.24 No. 2 p.209 ~ p.216
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Effect of Breed, Age, Season, Parity and Mating Type on Boar Semen Characteristics and Fertilizing Capacity
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Yun H. J.
Kang K.
Park Chang-Sik
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Abstract
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This study was carried out to investigate the effects of breed, age of boar, season, parity and mating system on boar semen characteristics and fertilizing capacity. A total of 4181 sows and 199 boars of Durocs (D), Landraces (L), and Yorkshires (Y) were used for this experiment at Darby Artificicial Insemination Center from 1996 through 1999. Semen volume per ejaculate was largest in Landrace (266.8 mell), followed by Yorkshire, and was smallest in Duroc. Sperm motility did not show significant differences among the above breeds. Sperm concentration was lowest in Landrace (4.7times10^{9} sperm/mell) and was highest in Duroc (5.7times10^{9} sperm/mell). Semen volume per ejaculate according to the age of boars was largest at the age of 2 years, followed by the age of 4 and 3 years, and was smallest at the age of I year. Semen volume per ejaculate according to the season in boars was largest in winter (228.6 mell), followed by autumn and summer, and was smallest in spring. Sperm concentration was highest in spring (5.9times10^{9} sperm/mell), followed by summer and winter, and was lowest in autumn. The average litter weight at birth did not show any differences according to the mating type. But the number of pigs born alive per litter was largest (9.5 pigs) in the natural mating ＋ artificial insemination group, followed by the artificial insemination group (9.2 pigs), and was smallest (8.9 pigs) in the natural mating group (P＜0.01). The average litter weight at birth and number of pigs born alive per litter did not show any differences between the natural mating and artificial insemination. The L (♀)timesY (♂) and L (♀)timesL (♂) matings show varepsilon d higher average litter weight at birth and number of pigs born alive per litter than the Y (♀) times Y (♂) and Y (♀) times L (♂) matings. The pigs in the 2~6th parities had higher average litter weight at birth and number of pigs born alive per litter than those in the 1 st and 7~9th parities.
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KEYWORD
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Boar semen, Litter weight, Natural mating, Artificial insemination
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