Sheep Preference for Fresh Leaf and Stem of Seven Accessions of Tedera Was Not Influenced by Prior Grazing Experience and Wilting Made No Difference

Tedera is a valuable high-quality forage for sheep during summer–autumn. There is evidence that prior grazing experience of novel forages influences preference and haymaking of tedera improves preference by goats. In the first experiment, it was hypothesised that the voluntary feed intake (VFI) of fresh leaves and stems of tedera by sheep would be greater for experienced vs. naïve sheep. In the second experiment, it was hypothesised that the VFI of naïve sheep fed wilted leaves and stems of tedera would be greater than fresh leaves and stems of tedera. To test these hypotheses, adult Merino sheep were fed seven accessions of tedera, in two outdoor pen feeding experiments conducted consecutively. Each of six pens had 14 feeders, two for each accession, and two sheep. In experiment 1, three pens had sheep that had previously grazed tedera (experienced) and three pens had sheep with no experience (naïve), and all were fed fresh leaves and stems of the seven tedera accessions. Experiment 2 involved only naïve sheep, with three pens fed fresh leaves and stems and three pens fed wilted leaves and stems of the seven tedera accessions. Preference was measured each day for six days in experiment 1; and for five days in experiment 2 by calculating the average differences of feed offered and feed remaining from the feeders. In experiment 1, experienced sheep showed no difference in preference (average percentage eaten) in the first hour of each day compared to naïve sheep (70% vs. 56% DM intake (kg), p = 0.27). There was an increase in the amount eaten from the first to the last day for both groups, except for the intake of one accession that was reduced for the experienced sheep. In experiment 2, there was no statistical difference in preference between accessions. However, when the average percentage eaten by the experienced and naïve groups are combined, they are strongly correlated, with significant differences between accessions. Sheep did not eat more wilted tedera compared to fresh, which did not support our hypothesis. The only differences we found in sheep preference for tedera accessions occurred in experiment 1. Further studies to investigate seasonal differences in sheep preference between accessions is required and increased replication is needed to better determine the effect of prior grazing experience on the preference for tedera accessions.

[1]  D. Real,et al.  Near infrared analysis for nutritive attributes of tedera (Bituminaria bituminosa var. albomarginata) , 2017 .

[2]  D. Real,et al.  Tedera proves its value as a summer and autumn feed for sheep in Mediterranean-like climates , 2017 .

[3]  D. Thomas,et al.  Individual and socially learned preferences for biserrula (Biserrula pelecinus L.) in sheep , 2015 .

[4]  D. Real,et al.  An animal house study on utilisation of fresh tedera (Bituminaria bituminosa var. albomarginata and crassiuscula) by Merino wethers , 2015 .

[5]  M. Ghaffari,et al.  Furanocoumarins in tedera do not affect ruminal fermentation in continuous culture , 2015 .

[6]  M. Nelson,et al.  Evaluation and breeding of tedera for Mediterranean climates in southern Australia , 2014, Crop and Pasture Science.

[7]  D. Thomas,et al.  Short periods of prior exposure can increase the intake by sheep of a woody forage shrub, Rhagodia preissii , 2014 .

[8]  P. Vercoe,et al.  Australian and Spanish scientists are collaborating in the domestication of tedera: young Merino sheep grazing a monoculture of tedera in autumn showed preference for certain accessions but no signs of ill health , 2013, Crop and Pasture Science.

[9]  R. Kingwell,et al.  A farm level assessment of a novel drought tolerant forage:Tedera (Bituminaria bituminosa C.H.Stirt var. albomarginata) , 2012 .

[10]  R. Behrendt,et al.  The merit of condition score and fat score as alternatives to liveweight for managing the nutrition of ewes , 2011 .

[11]  Richard J. Hayes,et al.  Evaluation of Perennial Forage Legumes and Herbs in Six Mediterranean Environments , 2011 .

[12]  D. Thomas,et al.  Preference of sheep among annual legumes is more closely related to plant nutritive characteristics as plants mature , 2010 .

[13]  A. Moore,et al.  Feed gaps in mixed-farming systems: insights from the Grain & Graze program , 2009 .

[14]  P. Méndez,et al.  Effect of season on tedera (Bituminaria bituminosa) intake by goats. , 2009 .

[15]  F. Provenza,et al.  Learning and Dietary Choice in Herbivores , 2009 .

[16]  L. Pecetti,et al.  Volatile compounds from leaves and flowers of Bituminaria bituminosa (L.) Stirt. (Fabaceae) from Italy , 2007 .

[17]  Juan J. Villalba,et al.  The Value to Herbivores of Plant Physical and Chemical Diversity in Time and Space , 2007 .

[18]  S. Mabjeesh,et al.  Effects of Grazing on Bituminaria bituminosa (L) Stirton: A Potential Forage Crop in Mediterranean Grasslands , 2006 .

[19]  G. Mata,et al.  Effects of Prima gland clover (Trifolium glanduliferum Boiss cv. Prima) consumption on sheep production and meat quality , 2006 .

[20]  F. Provenza,et al.  Linking herbivore experience, varied diets, and plant biochemical diversity , 2003 .

[21]  D. S. Fisher A Review of a Few Key Factors Regulating Voluntary Feed Intake in Ruminants , 2002 .

[22]  N. Schoknecht Soil groups of Western Australia : a simple guide to the main soils of Western Australia , 2002 .

[23]  A. Perevolotsky,et al.  Grazing effects on a perennial legume, Bituminaria bituminosa (L.) Stirton, in a Mediterranean rangeland. , 2000 .

[24]  G. Innocenti,et al.  Quantitative Recovery of Furanocoumarins from Psoralea bituminosa , 1997 .

[25]  R. Weston Some aspects of constraint to forage consumption by ruminants , 1996 .

[26]  F. Provenza Postingestive Feedback as an Elementary Determinant of Food Preference and Intake in Ruminants , 1995 .

[27]  R. J. Orr,et al.  The effects of group size on grazing time in sheep , 1993 .

[28]  S. Gherardi,et al.  Effect of palatability on voluntary feed intake by sheep. I. Identification of chemicals that alter the palatability of a forage , 1991 .

[29]  R. Beier,et al.  Linear furocoumarins and other constituents from thamnosma texana , 1984 .

[30]  P. Kenney,et al.  Factors affecting diet selection by sheep. 1. Potential intake rate and acceptability of feed , 1984 .

[31]  G. W. Arnold,et al.  The influence of odour and taste on the food preferences and food intake of sheep. , 1980 .

[32]  G. W. Reid,et al.  Relative palatability to sheep of straw, hay and dried grass , 1971, British Journal of Nutrition.

[33]  R. Rossiter Ecology of the Mediterranean Annual-Type Pasture , 1966 .