Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Concentration Differences in LH, FSH and Progesterone Secretion among Seasonal Changes in Hanwoo and Holstein Heifers in Daegwallyeong

  • Chung, Hak-Jae (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Yoon, Hyun-Il (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Lee, Suk-Dong (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Ko, Jin-Sung (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Choy, Yun-Ho (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Choi, Seong-Bok (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Jeon, Gi-Jun (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Ko, Yeoung-Gyu (Animal Biotechnology Division, National Institute of Animal Science, RDA) ;
  • Lee, Hwi-Cheul (Animal Biotechnology Division, National Institute of Animal Science, RDA) ;
  • Im, Seok-Ki (Hanwoo Experimental Station, National Institute of Animal Science, RDA) ;
  • Lee, Myeung-Sik (Hanwoo Experimental Station, National Institute of Animal Science, RDA)
  • Published : 2008.12.31
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Abstract

The objective of present study was to investigate the effect of seasons on reproductive performance of Hanwoo and Holstein heifers. Heat stress in summer or cold stress in winter stress to Hanwoo and Holstein heifers may bring reproduction failure, which would pose an important economic loss, even around Daegwallyeong region located in high mountainous area. Seasonal differences in the serum levels of LH, FSH and progesterone ($P_4$) in response to environmental factors (hot and cold) out of 20 pubertal Hanwoo heifers in Daegwallyeong, Gangwon Province and 20 non-lactating Holstein heifers in Chonan city of Republic of Korea at 2-3 years of age were compared. Blood samples for hormonal analysis were from jugular vein after detection of estrus repeatedly over four seasons within four-week intervals (Spring: May to June, Summer: July to August, Autumn: October to November and Winter: January to February). In Hanwoo heifer population, averages of LH and FSH concentration in spring and in summer were greater compared to those in winter (p<0.05). LH or FSH levels tended to be greater (p=0.06) in spring and less (p=0.09) in winter compared to the levels in autumn. Only in summer, cattle seemed to show lower LH or FSH secretion (p<0.05). Similar to the results in Hanwoo heifers, the serum concentrations of LH and FSH in Holstein heifers decreased further by heat stress in summer when P 4 levels were high during luteal phase. The results demonstrate significant effect of summer heat on reproduction of Hanwoo or Holstein heifers. Although parameters indicating the extent of heat stress were not measured in this study, we suggest that serum hormone levels could be considered as successful indicators of summer heat stress condition for Hanwoo and Holstein heifers even under rather cool summer climate.

Keywords

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