title: Association of rumen fill score and energy status during the close-up dry period with conception at first artificial insemination in dairy cows.
abstract: Recent studies have shown significant associations between prepartum energy status and postpartum fertility in dairy cows; therefore, the assessment of energy status by blood metabolites and metabolic hormones and suitable improvement of management during the prepartum period may enhance reproductive performance. Rumen fill score (RFS) is associated with feed intake; however, it is unknown whether RFS is also related to blood parameters. Therefore, this study investigated the relationship between RFS and energy status during the prepartum period, and their associations with conception at first artificial insemination (AI) after parturition. In 42 multiparous Holstein cows, RFS assessment and blood sampling were carried out twice a week during 3 weeks of the peripartum period. Ovarian cycles until AI were evaluated by measuring milk progesterone levels. Before calving, positive correlations were observed between RFS and total cholesterol, and RFS did not change in pregnant cows at first AI after parturition, whereas in non-pregnant cows, RFS decreased gradually as the calving day approached. After calving, non-pregnant cows showed lower energy status compared with pregnant cows, and some non-pregnant cows showed anovulation and cessation of estrous cycle. In conclusion, RFS during the close-up dry period is related to real-time energy status, and is associated with postpartum energy status and conception at first AI in dairy cows. © 2016 Japanese Society of Animal Science.
authors.affiliation: Field Center of Animal Science and Agriculture, Obihiro, Hokkaido, Japan. kawasima@obihiro.ac.jp.
authors.forename: Chiho
authors.initials: C
authors.lastname: Kawashima
authors.affiliation: Field Center of Animal Science and Agriculture, Obihiro, Hokkaido, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Karaki
authors.affiliation: Field Center of Animal Science and Agriculture, Obihiro, Hokkaido, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Munakata
authors.affiliation: Department of Applied Veterinary Medicine, Obihiro, Hokkaido, Japan.
authors.forename: Motozumi
authors.initials: M
authors.lastname: Matsui
authors.affiliation: Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Shimizu
authors.affiliation: Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Miyamoto
authors.affiliation: Field Center of Animal Science and Agriculture, Obihiro, Hokkaido, Japan.
authors.forename: Katsuya
authors.initials: K
authors.lastname: Kida
mesh_terms: D000818:Animals; D002417:Cattle / Q000378:metabolism* / Q000502:physiology*; D003612:Dairying; D004734:Energy Metabolism / Q000502:physiology*; D030762:Estrous Cycle / Q000502:physiology; D005260:Female; D005306:Fertilization / Q000502:physiology*; D007315:Insemination, Artificial; D008892:Milk / Q000737:chemistry; D036801:Parturition / Q000502:physiology; D049590:Postpartum Period / Q000502:physiology; D011247:Pregnancy; D011374:Progesterone / Q000032:analysis; D012417:Rumen / Q000502:physiology*
chemical_list: D011374:Progesterone
keywords: dairy cow; dry period; first artificial insemination; rumen fill score