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Effects of Forage Feeding Levels on the Udder Volume, Serum Hormone Level and Lactation Characteristics in Dairy Cows: From Growing to Lactating Phase

Holstein 젖소에서 조사료 급여 수준이 유방크기, 호르몬 및 산유특성에 미치는 영향: 육성기부터 비유기까지

  • Lee, Byung-Woo (Colleges of Veterinary Medicine and Institute of Veterinary Science) ;
  • Sugathan, Subi (Animal Life Science, Kangwon National University) ;
  • Singh, Naresh Kumar (Animal Life Science, Kangwon National University) ;
  • Yoon, Sei-Hyung (Grassland & Forage Division, National Institute of Animal Science) ;
  • Yoon, Byung-Il (Colleges of Veterinary Medicine and Institute of Veterinary Science)
  • 이병우 (강원대학교 수의과대학 및 동물의학종합연구소) ;
  • 수비 수가탄 (강원대학교 동물생명과학대학) ;
  • 나레시 쿠마 싱 (강원대학교 동물생명과학대학) ;
  • 윤세형 (국립축산과학원 초지사료과) ;
  • 윤병일 (강원대학교 수의과대학 및 동물의학종합연구소)
  • Received : 2013.11.25
  • Accepted : 2013.12.10
  • Published : 2013.12.31

Abstract

In the present study, we investigated the effects of high forage diets on the volume of udder, hormone level in blood, and lactation characteristics in the Holstein dairy cow. We divided into two groups; high forage diet [HF, concentrate: forage=4:6 n=41] and low forage diet [LF, 6:4 n=21]. Five cows were selected from each group based on their age for measuring the udder volume and the serum levels of estradiol and progesterone. Lactation characteristics were compared between HF and LF. The udder volume was 2.5 fold larger in HF at early gestation (p<0.01), but no difference was noted afterward. For the hormone levels, no significant difference was found between the groups. In HF, milk yield was significantly increased and maintained high longer, while somatic cell count was approximately 50% lower. Meanwhile, the milk fat content was significantly lower in HF during early lactating phase (p<0.001), but there was no difference thereafter. For milk protein and solid content, and MUN, no differences were found between the groups during lactation. Our results indicated that feeding high forage diets to dairy cows can increase milk yield and quality without notable changes in the udder volume and hormone level.

Acknowledgement

Supported by : 농촌진흥청

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