Abstract
The experiment included 30 lambs-crosses F1 generation: Pirot Pramenka (50%) x W?rttemberg (50%) and 30 crossbred F1 generations: Pirot Pramenka (12.5%) x W?rttemberg(37.5) x Ille de France (50%), weaned at 60 days of age, the average body weight of 18.0 kg. The mixtures varied in protein source: I - sunflower meal, II - soybean meal and III - fish meal. The share of undegradable protein was 43 : 51 : 58 %. The average diameter of the fibres in lambs on treatments I:II:III was 26.14 : 24.96 : 25.20 ?m, and of two-breed (PxW) and threebreed (PxWxIDF) crosses: 25.38 and 25.49 ?m. The average height of the wool fibre in lambs on treatments I:II:III was: 2.97 : 3.06 : 3.17 cm, and in two-breed (PxW) and three-breed (PxWxIDF) crosses 2.98 : 3.15 cm. The average length of the fibre in lambs on protein sources I:II:III was 4.62 : 5.08 : 5.11 cm and in twobreed (PXW) and three-breed (PxWxIDF) crosses 4.77 : 5.11 cm. Protein source in feed mixtures, and genotype of lambs significantly influenced the quality of wool expressed through diameter, height and length of the fibres.
Highlights
Wool is not a uniform biological product because its physical characteristics vary depending on sheep genetics, environment and management strategies (Warn et al, 2006; Poppi and McLenan, 2010)
The aim of the present study was to investigate the effect of different sources of protein in feed mixtures used in feeding of two populations of crosses: Pirot Pramenka x Württemberg (PXW) and Pirot Pramenka x Württemberg x Ille de France (PxWxIDF), on some physical and mechanical properties of wool
Established difference of 2.45 μm in the diameter of rump wool fibres taken from three-breed crosses on the third and first treatment, and to the benefit of treatment III, was highly significant (P= 0.000172)
Summary
Wool is not a uniform biological product because its physical characteristics vary depending on sheep genetics, environment and management strategies (Warn et al, 2006; Poppi and McLenan, 2010). The quality of wool has determined by the physical and mechanical properties: diameter (fineness), height, length, tortuosity, strength and ductility of the wool fibres (Ružić-Muslić, 2006). These properties have ascertained by Dragana Ružić-Muslić et al. Fibre diameter (FD) refers to the average width of a single cross section of wool fibre (Gillespie and Flanders, 2010). It is measured in microns (μm) which equates to one thousandth of a millimetre (Cottle, 1991; Cottle, 2010; Poppi and McLenan, 2010; Rowe, 2010). FD is widely acknowledged as the most important wool characteristics when assessing wool quality and value (Edriss et al, 2007; Kelly et al, 2007; Rowe, 2010) accounting for approximately 75% of the total price of raw wool (Jones et al, 2004; Mortimer et al, 2010)
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