Publication Date
1997
Description
Herbage quality was examined in paddocks continuously grazed by dairy cows fed supplements with low and high N. There were two sward types for each level of supplement, i.e. fertilized perennial ryegrass (Lolium perenne L) and unfertilized perennial ryegrass/white clover (Trifolium repens L) with a mean clover content of 49 % of dry matter. Decreasing N-intake from 307 to 140 g N cow -1 d -1 by feeding low-N supplements had a small influence on herbage quality in spite of the reduced N-output via urine and faeces. Variation in herbage quality was large during the growing season. The fibre concentration peaked in late summer, whereas the crude protein concentration increased throughout the growing season. The effective degradability of protein in the rumen was directly correlated with in vitro organic matter degradability. Clover/grass had higher protein degradability than pure grass in the second half of the grazing season.
Citation
Soegaard, K and Aaes, O, "Herbage Quality at Continuous Grazing with Dairy Cows at Different N-Intakes and Sward Types" (2024). IGC Proceedings (1997-2023). 35.
https://uknowledge.uky.edu/igc/1997/session17/35
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Herbage Quality at Continuous Grazing with Dairy Cows at Different N-Intakes and Sward Types
Herbage quality was examined in paddocks continuously grazed by dairy cows fed supplements with low and high N. There were two sward types for each level of supplement, i.e. fertilized perennial ryegrass (Lolium perenne L) and unfertilized perennial ryegrass/white clover (Trifolium repens L) with a mean clover content of 49 % of dry matter. Decreasing N-intake from 307 to 140 g N cow -1 d -1 by feeding low-N supplements had a small influence on herbage quality in spite of the reduced N-output via urine and faeces. Variation in herbage quality was large during the growing season. The fibre concentration peaked in late summer, whereas the crude protein concentration increased throughout the growing season. The effective degradability of protein in the rumen was directly correlated with in vitro organic matter degradability. Clover/grass had higher protein degradability than pure grass in the second half of the grazing season.
