Although regression tree method has recently become popular in animal science (Eyduran et al., 2008, 2013; Bakir et al., 2010; Topal et al., 2010; Tariq et al., 2012; Yilmaz et al., 2013; Khan et al., 2014), it has not yet been used to determine the relationships among wool characteristics and prediction of fleece weight. The decision tree method can be considered as a valuable tool for phenotypic characterization and quality classification of the sheep with regards to their wool characteristics.
Fleece weight (FW), staple length (SL), fiber length (FL), average number of crimps over a length of 5 cm (ANC) and wool fineness (WF) were investigated as physical wool properties.
It can be concluded that the coarse mixed fleece weight greatly determined by FL.
The wool traits included: autumn fleece weight (AFW), spring fleece weight (SFW), combined fleece weight (CFW).
Genetic parameter (heritability estimate) for fleece weight was estimated by using individual animal model.
Fleece weight (FW): The averages of autumn fleece weight (AFW) were 1.35+-0.82, spring greasy fleece weight (SFW) 1.17+-0.75 and combined fleece weight (CFW) 2.50+-0.64 kg, respectively (Table 1).
Greasy fleece weight (kg)###8.67**###199.62**###105.30**###1.07 NS###477.89**
Least square mean for annual greasy fleece weight was 2.53+-0.02 kg and data analysis for this trait revealed that location of flocks, year and age at shearing and sex were significant (Pandlt;0.01) sources of variation while the birth type had no influence.
Greasy fleece weights
and clean fleece weights
were similar between treatment groups (p>0.32).
The traits which influenced revenues and costs in the described production systems in both breeds were milk yield, milk fat and protein content, birth weight of lambs, growth rate of lambs from birth to weaning, growth rate of breeding lambs, fleece weight
, conception rate of female lambs and ewes, average litter size (total number of lambs born) per lambed ewe, survival rate of lambs to 24 h of age and from 24 h until weaning, and productive lifetime of ewes.
Although, goats have been traditionally one of the major sources of red meat in Iran (102,000 ton per year), however there are limited published results on the estimates of genetic parameters for growth traits and yearling fleece weight in Markhoz goats.
Measurements were taken on body weight performance at birth (BW), weaning (WW) at about three month of age, six month (6MW), nine month (9MW), yearling (YW) and on fleece weight at yearling age (YFW) of kids.