Estimation of some environmental effects on birth, weaning and 6-month weights in bakhtiari sheep breed of Khozestan province.
Subject Areas : Genetics
1 - animal science-olom tahghigh tehran
Keywords: ', Bakhtiari sheep", , ", weight", , ", environmental effects,
Abstract :
In this research for study of some environmental effects on birth, weaning and 6-month weights in Bakhtiari sheep breed of Khozestan province A total of 2265 weight records at different ages belonging to 755 Arabi sheep breed were born between 2012 and 2023 in 16 herds of Khuzestan province was used .The traits studied were weight at ages 0 (birth), 3 (weaning) and 6 months .The environmental factor effects obtained year of birth(in 6 level), sex(in 2 level), litter size(in 2 level), ewe lambing(in 5 level), dam age(in 5 level),herd (in 16 level)and lamb age were studied by using SAS software .The results obtained in the present research showed that herd , year of birth, sex, ewe lambing and two way interactions between sex and lamb age, between lamb age and year of birth, between lamb age and herd was significant (p<0.01)but litter size, ewe lambing and two way interactions between litter size and age had no significant(p<0.01). Least squares means of female lambs at ages 0, 3 and 6 were 3.54, 20.53 and 29.45 kg respectively and the corresponding figures for male lambs were found to be 4.42, 23 and 33.16 kg respectively. The results also indicated that the least squares means of weight at ages 0, 3 and 6 for single birth lambs were 3.97, 22.04 and 32.52 kg respectively and for twin birth lambs were 3.99, 21.48 and 30.09 kg respectively.