Teaching Animal Science and Genetics to Australian University Undergraduates to Enhance Inquiry-Based Student Learning and Research with Sheep: Growth and Conformation Traits in Crossbred Prime Lambs
Published: 2011-12-08
Page: 59-76
Issue: 2012 - Volume 2 [Issue 1]
A. E. O. Malau-Aduli *
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
E. Nightingale
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
P. McEvoy
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
J. U. Eve
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
A. J. John
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
A. A. Hobbins
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
A. A. S. Alamoudi
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
K. R. Petrie
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
P. Damen
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
M. E. French
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia
A. M. Cragie
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
S. K. Bales
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
A. Kashani
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
B. W. B. Holman
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
J. Vargas-Bravo
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
S. M. Jones
School of Zoology, University of Tasmania, Private Bag 5 Hobart, TAS 7001, Australia.
B.S. Malau-Aduli
Medical Education Unit, School of Medicine, University of Tasmania, TAS 7001, Australia.
P. A. Lane
Animal Production and Genetics, School of Agricultural Science, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54 Hobart, TAS 7001, Australia.
*Author to whom correspondence should be addressed.
Abstract
The primary objective of this Australian Wool Education Trust funded teaching initiative on inquiry-based learning and research-led teaching approach was to enhance students’ critical thinking and target their learning needs through active participation in hands-on experience with experimental sheep. The secondary objective was to study the effects of sire breed and sex on growth and body conformation traits in crossbred prime lambs at the University of Tasmania Farm, Cambridge. Body weight, average daily gain, body condition score, body length, withers height and chest girth in sixty first cross Merino lambs sired by White Suffolk and Poll Dorset rams were measured fortnightly over a ten-week period. Generalised linear model procedure in SAS was used for statistical analysis and included the fixed effects of sire breed, sex, fortnight and their second order interactions. Duncan’s Multiple Range Test, correlations between growth and conformation traits and Bonferroni probabilities were estimated and used for comparisons.
A fortnightly increase in lamb body weight, average daily gain and body condition score was evident. Wethers were heavier and had higher average daily gains than ewes. White Suffolk sired progeny had higher average daily gains than those sired by Dorset rams, but body weight did not differ between sire breeds. However, a highly significant interaction (P<0.0001) between sire breed and sex on body weight was evident as White Suffolk sired wethers were the heaviest prime lambs. It was concluded that the real world, hands-on research experience with experimental sheep, field trips, data collection, statistical analyses, data interpretation and seminar presentation of results facilitated a deeper student understanding of the scientific concepts of sire genetics and nutrition interactions in sheep growth.
Keywords: Research-based teaching, Inquiry-based learning, crossbred lambs, growth, body measurements, White Suffolk, Dorset, Merino, sheep genetics, SETL