The present study was conducted to analyze the effect of sex and type of birth on growth curve of Lori Bakhtiari lambs. The data were collected from 3081 male and female lambs from the birth to one-year old. In order to estimate the growth parameters, body weight of lambs was fitted to Gompertz model. Male lambs were heavier than females over the growth period (P<0.05). Moreover, single-born lambs were heavier than twin ones (P<0.05). Growth parameters were significantly affected by sex (P<0.05). There was a significant difference among the growth parameters for type of birth, except the weight at maturity (A) and weight at inflection point (y) (P<0.05). In addition, single-born lambs had higher K (rate of maturity) than twin ones (P<0.05). Male lambs had a higher growth rate than the female ones (P<0.05). The results showed male lambs had a faster growth and reached larger mature weight than female also, sex and type of birth are the main factor affecting on the growth of Lori Bakhtiari lambs.
کلید واژگان :birth type, Gompertz model, growth curve
ارزش ریالی : 600000 ریال
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