Grazing preference of dairy cows and pasture productivity for different cultivars of perennial ryegrass under contrasting managements
Date
Authors
Jordana Rivero, M. Jordana
Balocchi, Óscar A.
Neumann, Fabián Lukas
Siebald, Juan Agustín
Balocchi, Óscar A.
Neumann, Fabián Lukas
Siebald, Juan Agustín
Authors
Date
Datos de publicación:
10.3390/ani9050253
Keywords
Defoliation Regime - Dry Matter Intake - Herbage Mass - High Sugar Grass - Lolium Perenne - Nitrogen Fertilisation - Pasture Growth Rate - Pasture Yield - Nitrogen - Protein - Nitrogen - Protein - Agronomic Trait - Animal Experiment - Article - Autumn - Biomass Production - Controlled Study - Cultivar - Dairy Cattle - Defoliation - Dry Matter Intake - Fertilization - Forage Quality - Genetic Selection - Grass - Grazing - Growth Rate - Harvest - Herbage - Nonhuman - Nutritional Value - Pasture - Perennial Ryegrass - Sugar Intake - Summer - Temperature
Collections
Abstract
The objective of this study was to evaluate the pasture performance of different cultivars of perennial ryegrass, two high sugar and two standard cultivars, under two contrasting agronomic managements (aimed at either decreasing or increasing water soluble carbohydrates concentration), and their effects on the grazing preference of dairy cows. Eight treatments arising from the factorial combination of four cultivars and two managements were randomly applied to 31-m2 plots in three blocks. Pasture dry matter production and growth rate were measured for one year. Three grazing assessments were performed to establish the grazing preferences of six dairy cows in spring, summer and autumn. High sugar cultivars produced less dry matter per hectare than the standard cultivars. Cows consumed more grass and harvested a greater proportion of the pasture under the agronomic management aimed at decreasing sugar concentration, i.e., with a greater nitrogen fertilization rate and under a more frequent defoliation regime, which could be explained by the greater crude protein concentration achieved under this management. The results suggest that the genetic selection for greater levels of sugars was at the expense of herbage yield, and that cows preferred to graze herbage with a greater crude protein level instead of a greater sugar concentration. © 2020 Elsevier B.V., All rights reserved.
Description
Keywords
Defoliation Regime , Dry Matter Intake , Herbage Mass , High Sugar Grass , Lolium Perenne , Nitrogen Fertilisation , Pasture Growth Rate , Pasture Yield , Nitrogen , Protein , Nitrogen , Protein , Agronomic Trait , Animal Experiment , Article , Autumn , Biomass Production , Controlled Study , Cultivar , Dairy Cattle , Defoliation , Dry Matter Intake , Fertilization , Forage Quality , Genetic Selection , Grass , Grazing , Growth Rate , Harvest , Herbage , Nonhuman , Nutritional Value , Pasture , Perennial Ryegrass , Sugar Intake , Summer , Temperature
Citation
10.3390/ani9050253