نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم دامی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران.
2 گروه علوم دامی، واحد شهرقدس، دانشگاه آزاد اسلامی، تهران، ایران
3 گروه علوم دامی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
4 گروه علوم دامی، دانشکده کشاورزی، دانشگاه کردستان، سنندج، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This research investigated different economic selection indices to increase body weight in Markhoz goat breed. Birth weight (BW) at different ages (birth, breastfeeding cessation, 6-month and 9-month) was categorized as several two- and three-trait selection indices. Genetic parameters were measured in MTGSAM using the Bayesian statistical method. Selection index analyzes were made in SelAction. The results of comparing three-trait indices showed the highest total economic gain resulting from I9 was US$4.86. The total economic response for two-trait I4 was US$3.94 which exceeded 5 others. The highest direct genetic gain from three-trait indices was predicted for 9-month weight in two I8 and I9 indices to be about 0.63 kg. In addition, the highest direct genetic improvement resulting from two-trait indices was also predicted for the 9-month weight in the I3 to be 0.66 kg. Moreover, the selection and performance criteria revealed decreased phenotypic variance, heritability, and genetic correlation of traits. These changes differed in alternative selection schemes influenced by the initial population parameters, selection intensity, direct or indirect selection, and the number of traits included in the selection index. In conclusion, to maximize the total economic gain, two selection indices I9 and I4 can be suggested for the current condition of the Markhoz goat population. However, to preserve the phenotypic/genetic variance of traits, it is necessary to focus on strategies such as selection intensity, economic coefficients, indirect selection, and increasing the number of traits in selection indices.
کلیدواژهها [English]