Nutrition and wool growth.

Pi, Huifeng; Masters, DG; Freer, M.; Dove, H.

doi:10.1079/9780851995953.0165

Cited by 25 publications

(24 citation statements)

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“…Similarly, supplementation of fish meal did not affect wool production of Suffolk lambs (Walz et al, 1998). Similarly, wool growth is highly influenced by DMI (Hynd and Masters, 2002;Rangel and Gardiner, 2009) and as such, the uniform DMI in the current study may potentially explain the lack of effect on wool growth and quality. Similarly, wool growth is highly influenced by DMI (Hynd and Masters, 2002;Rangel and Gardiner, 2009) and as such, the uniform DMI in the current study may potentially explain the lack of effect on wool growth and quality.…”

Section: Wool Productionmentioning

confidence: 53%

Dose–response of supplementing marine algae (Schizochytrium spp.) on production performance, fatty acid profiles, and wool parameters of growing lambs1

Meale

Chaves

et al. 2014

Journal of Animal Science

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Microalgae are the original source of docosahexaenoic acid (DHA; 22:6n-3) in the marine food chain, and its inclusion in animal feeds has been considered as a means of increasing the DHA level in foods of animal origin. As such, this study aimed to investigate the effects of supplementing an algal meal, high in DHA derived from Schizochytrium spp. (DHA-G), in the diet of Canadian Arcott lambs, on growth, carcass characteristics, wool production, and fatty acid (FA) profiles of subcutaneous adipose tissues (SAT), perirenal adipose tissues (PAT), and skirt muscle (SM). Forty-four lambs were randomly assigned to dietary treatments. Diets consisted of a pelleted, barley-based finishing diet with DHA-G supplemented at 0, 1, 2, or 3% DM as a replacement for flax oil and barley grain. Feed deliveries and orts were recorded daily. Lambs were weighed weekly and slaughtered once they reached ≥ 45 kg live weight. Carcass characteristics, ruminal pH, and liver weights were determined at slaughter. Wool yield was determined on mid-side patches of 100 cm(2) shorn at d 0 and on the day before slaughter (d 105 or 140). Dye bands were used to determine wool growth, fiber diameter, and staple length. Adipose tissues and SM samples were taken at slaughter and analyzed for FA profiles. Data were analyzed using mixed procedure in SAS with orthogonal contrasts testing for linear, quadratic, or cubic responses to increasing levels of DHA-G. Daily DMI, ADG, and G:F were similar as were wool quality and yield (P > 0.05). Carcass characteristics were generally unaffected (P > 0.05), except for body wall thickness (mm), which showed a quadratic response (P = 0.01) with increasing DHA-G. The concentration of eicosapentaenoic acid (EPA; 20:5n-6; mg/100 g fresh tissue) linearly increased (P < 0.001) with DHA-G in both adipose tissues and responded quadratically in SM (P = 0.05). Similarly, DHA (mg/100 g fresh tissue) increased linearly (P < 0.01) with DHA-G in all tissue types (P < 0.001). Supplementing DHA-G decreased (P < 0.001) the n-6:n-3 ratio in all tissues. No effects (P ≥ 0.05) on PUFA or SFA were observed across the 3 tissues, with no response (P ≥ 0.10) in the SFA:PUFA ratio in either SM or SAT; however, the SFA:PUFA ratio linearly decreased in PAT (P = 0.01) as DHA-G increased. These results indicate that DHA-G can be successfully included in the diets of growing lambs, up to 3% DM, with the potential to improve carcass characteristics and the FA profile of adipose tissue and muscle.

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Section: Wool Productionmentioning

confidence: 53%

Dose–response of supplementing marine algae (Schizochytrium spp.) on production performance, fatty acid profiles, and wool parameters of growing lambs1

Meale

Chaves

et al. 2014

Journal of Animal Science

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“…A strong positive, linear relationship exists between DMI and wool growth rates in sheep (Hynd and Masters, 2002;Rangel and Gardiner, 2009). The nature of this relationship is largely dependent on the supply of AA and energy substrates to the wool follicle, the genetic potential of the animals, and the methodology used to measure wool growth (Hynd and Masters, 2002). In the current study, similar DMI and chemical composition of the diets may account for the uniformity observed in fi ber length across treatments (P = 0.82; Table 5).…”

Section: In Vivo Studymentioning

confidence: 94%

“…Similarly, wool yield, curvature, and comfort factor (percentage of fi bers below 30.5 μm) were not affected by dietary treatment (P ≥ 0.23). The predominant energy substrates available to the follicle appear to be glucose and glutamine, whereas acetate fails to maintain fi ber growth (Hynd and Masters, 2002). As glycerol can be fermented to propionate, a gluconeogenic precursor (Donkin et al, 2009), there is the potential for glycerol to increase energy availability to wool follicles.…”

Section: In Vivo Studymentioning

confidence: 99%

Effects of crude glycerin supplementation on wool production, feeding behavior, and body condition of Merino ewes1

Meale

Chaves

Ding

et al. 2013

Journal of Animal Science

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The increasing availability of crude glycerin from the biodiesel industry has led to an interest in its use as an energy source in ruminant diets. However, its effects on ruminal fermentation patterns and methane (CH4) production are unclear, and there are no reports on the effect of its inclusion in the diet on wool production or growth of Merino sheep. Thus, the objectives of this study were to determine the effects of increasing levels of crude glycerin on in vitro ruminal fermentation and CH4 production and DMI, BW, feeding behavior, and wool growth and quality in Merino ewes. Crude glycerin (99.2% pure, colorless, odorless, viscous liquid) replaced whole wheat grain in completely pelleted diets at levels of 0%, 6%, and 12% DM in both in vitro and in vivo studies. For in vitro studies, diets were dried and ground through a 1-mm screen and incubated on 2 different days for 24 h. Modified McDougal's buffer and rumen liquor were mixed 3:1, and gas production and CH4 concentration was measured after 6, 12, and 24 h of incubation with pH and IVDMD measured at 24 h. Cumulative gas (mL/g DM) and methane (mL) production was similar (P ≥ 0.35) among dietary treatments. In vitro dry matter disappearance (%) increased (P < 0.01) with increasing concentrations of crude glycerin. For the in vivo study, 39 Merino ewes were randomly assigned to 3 treatments (n = 13 ewes/treatment). Pelleted diets were available continuously for a 10-wk period through the use of automatic feeders. Ewes were weighed every 7 d. Wool yield was determined on mid-side patches of 100 cm(2) shorn at d 0 and d 70. Dye bands were used to determine wool growth and fiber length. Intake and ADG were similar among treatments (P = 0.59). Neither wool yield, length, spinning fineness, nor fiber diameter (μm) were affected after supplementation with crude glycerin (P ≥ 0.13). This study indicates the potential for crude glycerin to be included in the diets of Merino sheep at up to 12% DM without negatively affecting wool yield and quality.

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“…Wool synthesis is limited by the availability of sulphur amino acids -cysteine and methionine which are known to increase wool fineness due to low FD (Hynd & Masters, 2002;Liu & Masters, 2003). However, Spirulina is low in sulphur amino acid content compared to other protein-rich supplements (Ciferri & Tiboni, 1985;Volkmann, Imianovsky, Oliveira, & Sant'Anna, 2008).…”

Section: Discussionmentioning

confidence: 99%

Effect of Spirulina (Arthrospira plantensis) Supplementation on Wool Quality in Purebred and Crossbred Merino Lambs Fed Pasture and Lucerne Hay Basal Diets

Holman¹,

Malau‐Aduli

2014

JAS

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This study investigated the effects of Spirulina (Arthrospira plantensis) supplementation level, basal diet, sire breed, and sex on wool quality parameters in purebred and crossbred Merino lambs. A total of 48 lambs, over two consecutive years (n=24 per year), was randomly allocated into Spirulina supplementation level (CONTROL, LOW, MEDIUM, HIGH) groups and balanced by sire breed (Black Suffolk, Dorset, Merino, White Suffolk) and sex (ewes, wethers). Lambs had ad libitum access to a basal diet of pasture and Lucerne hay, and had Spirulina supplement daily throughout the 42-day feeding trial, after a 21-day adjustment phase. Mid-side wool samples were removed from each lamb at the beginning and end of the feeding trial and commercially analysed for quality. The wool quality data were transformed into 'wool trait change over the feeding trial period' by the difference between the wool measurements at the beginning and end of the experiment prior to statistical analysis. Wool clean fleece weight (CFW) was significantly influenced by level of supplementation, basal diet and sex (P<0.05). Spirulina-supplemented lambs on Lucerne hay basal diet elicited higher CFW responses which increased with supplementation level. CONTROL lambs had the lightest CFW regardless of basal diet. Sire breed and sex variations were significant (P<0.05) as wool from Suffolk-sired lambs and ewes had the highest fibre diameter coefficient of variation (CV) and CFW, respectively. CV and fibre diameter standard deviation were the most affected wool traits by significant interactions between Spirulina supplementation level, sire breed and sex. It was concluded that Spirulina supplementation with Lucerne hay basal diet improves wool CFW without compromising wool fibre diameter, comfort factor and spinning fineness in dual-purpose prime lambs.

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Nutrition and wool growth.

Cited by 25 publications

References 0 publications

Dose–response of supplementing marine algae (Schizochytrium spp.) on production performance, fatty acid profiles, and wool parameters of growing lambs1

Dose–response of supplementing marine algae (Schizochytrium spp.) on production performance, fatty acid profiles, and wool parameters of growing lambs1

Effects of crude glycerin supplementation on wool production, feeding behavior, and body condition of Merino ewes1

Effect of Spirulina (Arthrospira plantensis) Supplementation on Wool Quality in Purebred and Crossbred Merino Lambs Fed Pasture and Lucerne Hay Basal Diets

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