The occurrence of ryegrass staggers and heat stress in sheep grazing ryegrass-endophyte associations with diverse alkaloid profiles

New Zealand Veterinary Journal
L R FletcherD E Hume

Abstract

To compare ryegrass pastures infected with endophytes producing diverse alkaloids for their ability to cause ryegrass staggers in grazing lambs; to compare respiration rates and rectal temperatures of these lambs after exposure to heat stress, and to compare liveweight gains during the study period. Ryegrass pastures of cultivar Trojan infected with NEA endophytes, branded NEA2 (T-NEA2), endophyte-free Trojan (T-NIL), Samson infected with standard endophyte (S-STD), Samson infected with AR37 endophyte (S-AR37) and endophyte-free Samson (S-NIL), were grazed by lambs (n=30 per cultivar) for up to 48 days in February and March of 2012 and 2013. Pasture samples were analysed for alkaloid concentrations and lambs were scored for ryegrass staggers at intervals during the study period. Liveweight was recorded at the start (Day 0) and end of the study, and rectal temperatures and respiratory rates were measured in lambs exposed to heat stress on Days 23 and 26, in 2012 and 2013, respectively. Concentrations of alkaloids were lower in 2012 than 2013, associated with warmer and drier conditions in 2013, and the prevalence of ryegrass staggers was low in 2012. In 2013, concentrations of ergovaline were similar in T-NEA2 and S-STD, but con...Continue Reading

References

Oct 1, 1981·New Zealand Veterinary Journal·L R Fletcher, I C Harvey
Oct 1, 1995·Journal of Paediatrics and Child Health·D B Thomas
Nov 1, 1995·Journal of the American Animal Hospital Association·G BlockD B DeNicola
Dec 20, 2011·New Zealand Veterinary Journal·S C FinchJ V Babu
Sep 19, 2012·New Zealand Veterinary Journal·S C FinchC D Waugh
Apr 24, 2014·FEMS Microbiology Ecology·Stuart D CardDavid E Hume
Nov 10, 2015·Journal of Agricultural and Food Chemistry·Joseph Raymond MooreLeslie Ann Weston

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Citations

Jun 28, 2018·New Zealand Veterinary Journal·M D CombsJ C Quinn
Dec 15, 2017·New Zealand Veterinary Journal·S C FinchL R Fletcher
Jun 21, 2020·World Journal of Microbiology & Biotechnology·R BharadwajS Ramalingam

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Methods Mentioned

BETA
infrared reflectance spectroscopy

Software Mentioned

Minitab
Optic user ( OPUS )

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