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Herbage intake and ruminal digestion of dairy cows grazed on perennial ryegrass pasture either in the morning or evening
Author(s) -
Ueda Koichiro,
Mitani Tomohiro,
Kondo Seiji
Publication year - 2016
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12527
Subject(s) - pasture , evening , perennial plant , morning , agronomy , digestion (alchemy) , grazing , zoology , biology , chemistry , botany , physics , astronomy , chromatography
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 NH 3 ‐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.