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Effects of dietary sunflower seeds on rumen protozoa and growth of lambs

Published online by Cambridge University Press:  09 March 2007

M. Ivan ,
P. S. Mir ,
Z. Mir ,
T. Entz ,
M. L. He  and
T. A. McAllister
M. Ivan*
Affiliation:
Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1 Agriculture and Agri-Food Canada, P.O. Box 40-2000 Road 108 East, Lennoxville, Quebec, Canada J1M 1Z3
P. S. Mir
Affiliation:
Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
Z. Mir
Affiliation:
Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
T. Entz
Affiliation:
Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
M. L. He
Affiliation:
Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
T. A. McAllister
Affiliation:
Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
*
*Corresponding author: Dr Michael Ivan, fax +1 613 254 9205, email ivanm@agr.gc.ca
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Abstract

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Linoleic acid-rich sunflower-seed supplements (SSS) were used in two experiments (experiment 1, high-concentrate diets; experiment 2, high-forage diets) to study effects on rumen protozoa and the growth of lambs. Both experiments consisted of four treatments, two with a low-protein diet (120 g/kg) and two with a high-protein diet (160 g/kg). For both diets, one treatment was without (control) and one with the SSS (140 g/kg dietary DM). The lambs were fed ad libitum for 70 and 140 d in experiments 1 and 2, respectively. Thereafter, the digestibility of organic matter (OM), acid-detergent fibre and neutral-detergent fibre were determined for each diet with four lambs, and then all lambs were slaughtered and rumen fluid samples were collected and analysed. The results showed substantial decreases (P<0·001) or total elimination of protozoa in the rumen fluid of the SSS-receiving lambs. In the first experiment the SSS also decreased (P<0·05) feed intake, but an increase in average daily gain (P<0·06) resulted in an improved (P<0·05) feed:gain ratio. Also, the SSS increased (P<0·05) the digestibility of fibre. In the second experiment the SSS decreased (P<0·05) the OM digestibility, feed intake and growth of lambs. It was concluded that the use of sunflower-seed supplementation in high-concentrate diets of ruminants reduces rumen fauna, resulting in savings on dietary protein supplements and an increased digestion of feed.

Keywords

Sunflower seedsRumen ciliate protozoaLamb growth
Type
Research Article
Information
British Journal of Nutrition , Volume 92 , Issue 2 , August 2004 , pp. 303 - 310
Copyright
Copyright © The Nutrition Society 2004

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