dcterms:abstract
  • Presently, the first pregnancy age of dairy heifers attended National Dairy Herd Improvement Program (NDHI) in Korea has increased, and more research have been requested to evaluate the possibility of decreasing the first pregnancy age of dairy heifers. Accordingly, this study was investigated the effects of the month of age at the first service and pregnancy on the reproductive efficiency of Holstein heifers. For these, the reproductive performance of heifers was analyzed by evaluating the effects of first insemination service at 12-14 months of age (12 month old), 15-16 months of age (15 month old), 17-19 months of age (17 month old), and > 20 months of age (20 month old) in Holstein heifers. The service numbers per conception in the first insemination months were 1.85±1.22, 1.59±0.77, 1.58±0.72, and 1.76±0.97 times at 12, 15, 17 and 20 months of age, respectively. The conception rates in the first service were 51.2, 57.8, 54.8, and 52.9% at 12, 15, 17 and 20 months of age, respectively. The conception ages were 453.2±78.9, 512.1±75.9, 590.1±98.0, and 713.0±74.5 days in the heifers serviced firstly at 12, 15, 17 and 20 months of age, respectively. There was significantly difference in the conception age among groups (p<0.05). The cumulative conception rates in the heifers serviced firstly at 12, 15, 17 and 20 months of age were 51.21, 57.8, 54.8 and 53.0% by the first service, 29.8, 30.1, 32.3, 23.5% by the second service, and 19.0, 12.1, 12.9 and 23.5% by the third service, respectively. The service numbers per conception in the first pregnancy months were 1.31, 1.55, 2.0, 2.05 times at 12, 15, 17 and 20 months of the first service age, respectively. The service numbers per conception in the 12 and 15 months of age were significantly lower than those in the 17 and 20 months of age (p<0.05). The rates of repeat-breeder were 6.0, 11.3, 22.0, and 41.0% in the heifers serviced firstly at 12, 15, 17 and 20 months of age, respectively. These results demonstrate that first pregnancy of Holstein heifers should be conducted at 15 months of age, because the age at first pregnancy in heifers can be substantially influenced through implementation of reproductive management and performance (xsd:string)
dcterms:accessRights
dcterms:alternative
  • effects of age at first service and pregnancy on reproductive performance in holstein heifers (xsd:string)
nlon:antecedentSource
  • born digital (xsd:string)
nlon:audienceNote
  • 일반이용자 (xsd:string)
dc:creator
  • 기광석 (xsd:string)
  • 김남영 (xsd:string)
  • 김태일 (xsd:string)
  • 박남건 (xsd:string)
  • 안현숙 (xsd:string)
  • 윤현상 (xsd:string)
  • 이왕식 (xsd:string)
  • 조인철 (xsd:string)
  • 채현석 (xsd:string)
dcterms:creator
nlon:datePublished
  • 2021-01-26T07:37:57 (xsd:dateTime)
  • 2021-09-02T03:16:46 (xsd:dateTime)
dcterms:description
  • 한국연구재단 제공 KCI 등재(후보)학술지임 (xsd:string)
bibo:doi
  • http://dx.doi.org/10.12718/AARS.2014.25.2.105 (xsd:string)
bibframe:extent
  • 9 p (xsd:string)
dc:format
  • application/pdf (xsd:string)
nlon:genre
  • 학술논문 (xsd:string)
nlon:holdingInstitution
  • 국립중앙도서관 (xsd:string)
bibo:issn
  • 12252964 (xsd:string)
dcterms:issued
  • 201412 (xsd:string)
rdfs:label
  • 초수정 및 초임월령이 홀스타인 육성우의 번식성적에 미치는 영향 / Yoon, Hyun-sang / Lee, Wang-shik / Ahn, Hyun-sook / Ki, Kwang-seok / Kim, Tae-il / Chae, Hyun-seok / Kim, Nam-young / Cho, In-chul / Park, Nam-geon (xsd:string)
  • 초수정 및 초임월령이 홀스타인 육성우의 번식성적에 미치는 영향 / Yoon, Hyun-sang / Lee, Wang-shik / Ahn, Hyun-sook / Ki, Kwang-seok / Kim, Tae-il / Chae, Hyun-seok / Kim, Nam-young / Cho, In-chul / Park, Nam-geon / Yoon, Hyun-sang / Lee, Wang-shik / Ahn, Hyun-sook / Ki, Kwang-seok / Kim, Tae-il / Chae, Hyun-seok / Kim, Nam-young / Cho, In-chul / Park, Nam-geon (xsd:string)
nlon:medium
  • 전자자료(Application) (xsd:string)
nlon:publicationPlace
  • 강원 (xsd:string)
dc:publisher
  • 동물자원공동연구소 (xsd:string)
nlon:relatedParts
  • 25권 2호 (xsd:string)
nlon:restriction
  • 국립중앙도서관 공개 (xsd:string)
dcterms:title
  • 초수정 및 초임월령이 홀스타인 육성우의 번식성적에 미치는 영향 (xsd:string)
nlon:titleOfHostItem
  • ANNALS OF ANIMAL RESOURCE SCIENCES (xsd:string)
  • 동물자원연구 (xsd:string)
rdf:type
nlon:typeOfResource