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

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.\ud \ud 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

Analysis of mode distribution for PMMA Whispering gallery mode resonators

Polimetilmetakrilāta (PMMA) čukstošo galeriju modu (ČGM) mikro sfēru rezonatori ir komerciāli pieejami ar tipiskajiem labuma (Q) faktoriem 10^3-10^4. Izmantojot attēlu apstrādes tehniku ar augstu izšķirtspēju (1.9µm/px), ir iespējams monitorēt absorbcijas spektru. Šajā darbā tika izstrādāta jauna veida attēlu apstrādes metode priekš ČGM mikro rezonatoriem, lai analizētu intensitātes sadalījumu atsevišķos (40-70µm) PMMA ČGM mikro rezonatoru reģionos mainot ārējos fizikālos apstākļus. Intensitātes izmaiņas var tikt izmantotas lai raksturotu augstāku kārtu modu mijiedarbību un integrētu sensoru sistēmā.Poly methyl methacrylate acrylic (PMMA) whispering gallery mode (WGM) micro sphere resonators are commercially available with typical optical quality factor of 10^3-10^4. Using image processing techniques, with (1.9µm/px) high resolution, the absorption spectrum could be monitored. In the present work a new type of image processing for WGM micro-resonators was developed, to analyze intensity distribution in separate regions for PMMA WGM micro-resonators (40-70 µm) by changing the external physical properties such as temperature and wavelength. The intensity changes can be used as a representation of higher order spacial mode groups and integrated into optical sensors