Document Type : Research Paper

Authors

• Seyed Abu Taleb Sadeghi ¹
• Mohammad Rokouei ²
• Mehdi Vafa Valleh ³
• Mokhtar Ali ABBASI ⁴
• Hadi Faraji- Arough ⁵

¹ 1-Ph.D. student, Associate Prof., and Assistant Prof. of Dep. of Animal Science, Agriculture Faculty, University of Zabol 2-Assistant Prof., of Animal Science Research Department, Bushehr Agricultural and Natural Resources Research

² Department of Animal Science, Faculty of Agriculture, University of Zabol, Zabol, IRAN

³ Assistant Professor, Animal Breeding and Genetics, University of Zabol

⁴ Assistant Prof., of Animal Science Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Karaj

⁵ Research Center of Domeatic Animals, University of Zabol

Abstract

The objective of this study was to compare genetic gain, inbreeding rate and generation intervals from three breeding programs, include open nucleus, closed nucleus and sire reference through stochastic simulation. Four levels of herd size, three levels of number of female per male, and four selection indices in three breeding programs (open nucleus, closed nucleus and sire references) were combined to make of 144 scenarios. The highest total genetic gain and genetic gain of traits were obtained in the open nucleus system. The closed nucleus had the lowest generation interval, and it in terms of the inbreeding rate was between the other two systems. The sire reference system had the least amount of inbreeding and maximum generation interval. The generation interval affected by herd size and showed a significant difference in the herd level and increased with increasing herd size. The number of female per male significantly affected the inbreeding rate and generation interval, but total genetic gain and genetic gain of the traits were less affected, and the high value was observed in the 25 female per male scenario. The selected indices showed a significant effect on the total genetic gain, and the highest value was obtained in index 4 (Weight at selling, Number of kidding per year, Litter size).

Keywords

• Open nucleus
• Closed nucleus
• Sire reference
• Genetic gain
• Inbreeding