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.
Multivariate analysis results obtained for estimates of direct additive genetic correlations, maternal additive genetic correlations, maternal permanent environmental correlations, phenotypic and environmental correlations between body weight at different ages and yearling fleece weight are given in Table 4.
The least square mean for yearling greasy fleece weight was lower than those reported for Angora goat by Yalcin et al.
The effects of non genetic factors indicated that performance records for body weight at different ages should be corrected for effects of sex, type of birth, age of dam, year of birth and age of kids at WW, 6MW and 9MW, but for yearling greasy fleece weight only correction for effect of year is needed.