Monitoring inbreeding trends and inbreeding depression for economically important traits of Holstein cattle in Iran

• Published in: Journal of dairy science Vol. 93; no. 7; pp. 3294 - 3302
• Main Authors: Rokouei, M., Vaez Torshizi, R., Moradi Shahrbabak, M., Sargolzaei, M., Sørensen, A.C.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.07.2010; Elsevier; American Dairy Science Association
• Subjects: animal performance; Animal productions; Animals; Biological and medical sciences; calving; cattle; Cattle - physiology; culling (animals); Dairying - economics; Dairying - methods; Dairying - statistics & numerical data; Databases, Factual; ease of birth; economic impact; Female; Food industries; Fundamental and applied biological sciences. Psychology; Holstein; Inbreeding - economics; Inbreeding - statistics & numerical data; inbreeding depression; Iran; Iranian Holstein; Lactation - physiology; Longevity - physiology; Male; Milk - cytology; Milk and cheese industries. Ice creams; Models, Biological; monitoring; Pedigree; production; reproduction; Reproduction - physiology; Terrestrial animal productions; traits; Vertebrates; Iran; inbreeding depression; production; Iranian Holstein; reproduction; Inbreeding depression; Reproduction; Farming animal; Dairy industry; Production; Trend; Inbreeding; Livestock; Monitoring
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.2009-2748

Pedigree information of 852,443 registered Holstein cows and bulls, collected by the Animal Breeding Center of Iran from 1971 to 2007, was used to calculate inbreeding coefficients and their effect on production, reproduction, somatic cell count, calving ease, and longevity traits. The average inbreeding coefficient for the entire population was 2.90%, ranging from zero to 47.03%. The rates of inbreeding from 1989 to 2007 were 0.22 and 0.15% per year for females and males, respectively. The rates were higher after 2000, being 0.31 and 0.21% per year for females and males, respectively. Inbreeding had a deleterious effect on most traits. For the first 3 lactations, the inbreeding depression per 1% increase in inbreeding was −18.72, −16.19, and −27.38kg for milk yield, −0.443, −0.367, and −0.690kg for fat yield, and −0.476, −0.425, and −0.66kg for protein yield, respectively. For all reproductive traits, the observed undesirable effect of inbreeding was not significant, except for the calving interval (0.53 d per 1% increase in inbreeding) in the third parity and age at first calving (0.45 d per 1% increase in inbreeding). Calving ease in heifers and cows was significantly influenced by the inbreeding of the dam, indicating that highly inbred cows had a higher incidence of difficult calvings. The estimate of inbreeding depression for somatic cell score was low and significant only for the third lactation. However, animals with high inbreeding coefficient tended to have higher somatic cell scores than animals with low inbreeding coefficients. For type traits, the influence of inbreeding was significant only for stature, chest width, body depth, size, rear udder height, suspensory ligament, udder depth, and front and rear teat placement. Cows with high levels of inbreeding coefficient were at higher relative risk of being culled.