New Zealand Journal of Agricultural Research abstracts
Evaluation of the feeding value of Aries HD perennial ryegrass (Lolium
perenne). II. Performance of weaned lambs in summer and autumn
S. J. BLUETT
J. HODGSON
P. D. KEMP
Institute of Natural Resources
Massey University
Private Bag 11222
Palmerston North, New Zealand
T. N. BARRY
Institute of Food Nutrition and Human Health
Massey University
Private Bag 11222
Palmerston North, New Zealand
Abstract The feeding value of Aries HD perennial ryegrass
(Lolium perenne) was evaluated over summer (2 Dec 1996 to 12 March 1997)
using Romney weaned lambs, with Yatsyn 1 perennial ryegrass as the control
cultivar. There were three replicate plots of each cultivar of 0.33 ha
continuously stocked with 8 lambs per plot to maintain a mean sward surface
height of 6 cm. There was no significant difference in lamb liveweight gain
(116 versus 111 +/- 5.1 g day-1, P > 0.6) or herbage
intake (0.7 versus 0.6 +/- 0.10 kg OM day-1, P > 0.5)
between Aries HD and Yatsyn 1 lambs. Liveweight gain of lambs (mean of two
treatments) decreased as the experiment progressed from 174 g day-1
in December, to 102 g day-1 in January/February, to 76 g
day-1 in February/March. Incidence of ryegrass staggers was low with
9% of Yatsyn 1 lambs being affected over late February/early March, which
coincided with a peak lolitrem B concentration of 1.37 ppm in Yatsyn 1 pasture,
which was similar between cultivars. There was no significant difference in
final carcass weight of lambs grazing Aries HD and Yatsyn 1 (14.9 versus 14.6
+/- 0.24 kg, P > 0.5), reflecting the similar nutritive value and
alkaloid concentrations of the two cultivars over this summer/autumn period.
Keywords alkaloids; Aries HD; perennial ryegrass; Lolium
perenne; endophyte; nutritive value; Neotyphodium lolii; feeding
value; sheep performance; digestibility; ryegrass staggers; ryegrass/endophyte
association
New Zealand Journal of Agricultural Research, 1999, Vol. 42: 449-458
0028-8233/99/4204-0449 $7.00/0 (c) The Royal Society of New Zealand
1999
PDF file of entire paper: medium quality (703K); (scanned from paper original: notes about this process)
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