Wool quality traits, body conformation and liveweight measurement changes in ewe and wether lambs supplemented with Spirulina

Holman, Benjamin W.B., Kashani, Arash, and Malau-Aduli, Aduli E.O. (2013) Wool quality traits, body conformation and liveweight measurement changes in ewe and wether lambs supplemented with Spirulina. In: Proceedings of the 11th World Conference on Animal Production (11) p. 201. From: 11th World Conference on Animal Production, 15-20 October 2013, Beijing, China.

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Abstract

Spirulina (Arthrospira platensis) is an edible cyanobacterium rich in protein and several essential fatty acids, amino acids, vitamins and minerals. This has raised its profile as a potential supplement in lamb production. Yet, the underpinning effects of Spirulina supplementation on lamb products such as wool and meat, interrelations vital to its applicability in the sheep industry is presently largely unknown. Therefore, our experimental objective was to evaluate the correlations between changes in wool quality traits, body conformation and liveweight measurements in lambs supplemented with Spirulina, as affected by sex and supplementation level. Over two consecutive years (2011-12) at the University Farm Cambridge, Tasmania, AUS, a mating ratio of 1 terminal ram to 100 Merino ewes was applied to produce approximately 1600 crossbred progeny. At 12 weeks of age, all progeny were weaned onto ryegrass pasture. At 6 months old, a total of 48 Iambs were randomly selected for each feeding trial (24 per year). These were then randomly allocated into Spirulina supplementation treatment levels - CONTROL (0 mL), LOW (100 mL) or HIGH (200 mL), and balanced by sex (ewes and wethers). Each feeding trial continued for 9-weeks including 3-weeks of adjustment, during which Spirulina was directly supplemented daily to lambs ,-ia oral drenching as a water suspension with a I: 10 w/v ration of Spirulina (g) : Water (mL). All lambs received barley grain daily (150 g) and had ad libitum access to drinking water and a basal diet of ryegrass pasture throughout the trial. Individual lamb body conformation and live weight measurements were taken at the start and end of each feeding trial on chest girth (CG), wither height (WH), body length (BL), body condition score (BCS), and live weight (BWT). Mid-side wool samples were taken and analyzed for clean fleece yield (YIELD), mean fiber diameter (FD), coefficient of fiber diameter variation (CV), fiber diameter standard deviation (SD), comfort factor (CF), fiber curvature (CURV) and spinning fineness (SF). All data were transformed to changes (Δ) in wool quality traits over the feeding trial by subtracting final from initial measurements. SAS analysis for significant (P<.0.05) correlations between wool quality traits, body conformation and live weight measurements as influenced by Spirulina supplementation level and sex were investigated. It was observed in CONTROL lambs that ΔYIELD was negatively correlated with ΔBWT in wethers (-0. 78) and with ΔBCS in both ewes (-0.86) and wethers (-0.91). CONTROL ewe ΔCG was positively correlated with ΔFD (0.82) and ΔSF (0.86), and negatively with CF (-0.80). LOW Spirulina supplementation to ewe lambs showed no relationship between wool quality traits, body conformation and live weight measurements (P>0.05). However, in wethers, ΔBCS and ΔCURV were negatively correlated (-0.90). In the HIGH Spirulina supplementation group, YIELD was significantly correlated with ΔBL (0.86) and ΔBWT (-0.80) in wether and ewe lambs respectively. All other correlations were insignificant (P>0.05). In conclusion, this study does not only demonstrate Spirulina's potential as a nutritious lamb supplement, but the relationships and strength of the correlations between wool, body conformation and live weight will assist in product management and serve as a tool for achieving desired wool and growth goals in sheep flocks.

Item ID: 55047
Item Type: Conference Item (Abstract / Summary)
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Date Deposited: 22 Aug 2018 01:28
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070204 Animal Nutrition @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830310 Sheep - Meat @ 50%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830311 Sheep - Wool @ 50%
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