title: Herbage intake and ruminal digestion of dairy cows grazed on perennial ryegrass pasture either in the morning or evening.
abstract: This study aimed to clarify diurnal fluctuations of herbage intake, ruminal fermentation of herbage carbohydrates and proteins, and digesta particulate weight in the rumen of grazing dairy cows. Six ruminally cannulated, non-lactating dairy cows were grazed on perennial ryegrass/white clover pasture either in the morning (04.00 to 08.00 hours) or the evening (16.00 to 20.00 hours). Cows grazed in the evening spent more time (P < 0.01) and consumed more herbage (P < 0.01) compared with cows grazed in the morning. Higher (P < 0.05) daily mean concentrations of total volatile fatty acid, propionate and n-butyrate in rumen fluid were observed for cows grazed in the evening compared with cows grazed in the morning. Although cows grazed in the evening ingested more crude protein compared with cows grazed in the morning, no significant difference in NH3 -N concentration in rumen fluid was observed between them. The ratio of purine-derivative concentration to creatinine concentrations was higher (P < 0.01) in the urine of cows grazed in the evening than in cows grazed in the morning. These results clearly indicated that evening grazing was advantageous for dairy cows compared with morning grazing, in terms of ruminal fermentable energy intake and nitrogen utilization efficiency.
authors.affiliation: Laboratory of Animal Production System, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ueda
authors.affiliation: Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Mitani
authors.affiliation: Laboratory of Animal Production System, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Kondo
mesh_terms: D000641:Ammonia / Q000378:metabolism; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D002087:Butyrates / Q000378:metabolism; D002417:Cattle; D002940:Circadian Rhythm / Q000502:physiology*; D003612:Dairying; D004032:Diet / Q000662:veterinary*; D004040:Dietary Carbohydrates / Q000378:metabolism; D004063:Digestion / Q000502:physiology*; D004435:Eating / Q000502:physiology*; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005260:Female; D005285:Fermentation; D060434:Herbivory / Q000502:physiology*; D008129:Lolium; D009584:Nitrogen / Q000378:metabolism; D014674:Plant Proteins, Dietary / Q000378:metabolism; D011422:Propionates / Q000378:metabolism; D012417:Rumen / Q000378:metabolism* / Q000502:physiology*; D013997:Time Factors
chemical_list: D002087:Butyrates; D004040:Dietary Carbohydrates; D005232:Fatty Acids, Volatile; D014674:Plant Proteins, Dietary; D011422:Propionates; D000641:Ammonia; D009584:Nitrogen
keywords: dairy cow; diurnal change; grazing; herbage intake; ruminal digestion