The Effect of Inbreeding on Lactation Performance in Holstein Cows of Iran
محورهای موضوعی : CamelH. Atashi 1 , M.B. Sayadnejad 2 , A. Asaadi 3
1 - Department of Animal Science, Shiraz University, Shiraz, Iran
2 - Animal Breeding Center of Iran, Karaj, Iran
3 - School of Veterinary Science, Shiraz University, Shiraz, Iran
کلید واژه:
چکیده مقاله :
The objective of this study was to investigate the effect of inbreeding on lactation performance in Holstein cows of Iran.The pedigree file contained information of 1,025,281 animals born between 1965 and 2007.Lactation performance records from March 2000 to April 2009 comprising 193,501calving events on 123,751 cows in 85 dairy herds were included in the data set. The potential consequent effects of inbreeding on lactation traits were analyzed through mixed linear model using the MIXED procedure of the SAS. The mean level of inbreeding was shown to be 0.7%. Less than 37% of all animals were inbred, and a small proportion, 3.45%, of inbreed animals had inbreeding coefficients greater than 5%, with a maximum inbreeding coefficient of 38%. Overall mean (±SD) of 305-d milk, fat and protein yields were estimated to be 7812 (±1780), 252.5 (±64.5), and 247.8 (±50.6) kg, respectively. The 305-d milk, fat and protein yields decreased by -19 (±3.7), -0.7 (±0.13), and -0.43 (±0.13) kg per lactation for each 1% increase in inbreeding, respectively. Inbreeding showed no significant impact on fat and protein percentages.
Adamec V., Cassell B.G, Smith E.P. and Pearson R.E. (2006). Effects of inbreeding in the dam on dystocia and stillbirths in US Holsteins. J. Dairy Sci. 89, 307-314.
Croquet C., Mayeres P., Gillon A., Hammami H., Soyeurt H., Vanderick S. and Gengler N. (2007). Linear and curvilinear effects of inbreeding on production traits for Walloon Holstein cows. J. Dairy Sci.90, 465-471.
Casanova L., Hagger C., Kuenzi N. and Schneeberger M. (1992). Inbreeding in Swiss Braunvieh and its influence on breeding values predicted from a repeatability model. J. Dairy Sci. 75,1119-1126.
Falconer D.S. and Mackay T.F.C. (1996). Introduction to Quantitative Genetics. 4th Ed. Longman, Essex, UK.
Fuerst C. and Solkner J. (1994). Additive and nonadditive genetic variances for milk yield, fertility and lifetime performance traits of dairy cattle. J. Dairy Sci. 77, 1114-1125.
Hodges J., Tannen L., McGillivray B.J., Hiley P.G. and Ellis S. (1979). Inbreeding levels and their effect on milk, fat and calving interval in Holstein- Friesian cattle. Can.J. Anim. Sci. 59, 153-158.
Meuwissen T.H.E. and Luo Z. (1992). Computing inbreeding coefficients in large populations. Genet. Sel. Evol. 24, 305–313.
Miglior F., Burnside E.B. and Kennedy B.W. (1995). Estimation of non-additive genetic variance components and inbreeding depression.J. Dairy Sci. 78, 1174-1180.
Rokoei M., Molasalehi M.R., Sayadnejad M.B. and Moghimi A. (2000). To study, method of effect of inbreeding on the characteristics of milk production in society of Holsteins cattle of Iran. Proceedings of the first seminar on genetics and breeding applied to livestock, poultry and aquatics, March 2000, Karaj, Iran, Pp. 88-93(in Persian with English abstract).
SAS Institute. (2002). User’s Guide: Statistics. Version 9.1 Ed. SAS Inst. Inc., Cary, NC.
Short T.H. and Lawlor T.J. (1992). Inbreeding in the U.S. Holsteins and its effect on yield and type traits.J. Dairy Sci. 75,154. (Abstract).
Smith L.A., Cassell B.G. and Person R.E. (1998). The effects of inbreeding on lifetime performance of dairy cattle. J. Dairy Sci. 81,2729-2737.
Thompson G.M. and Freeman A.E. (1967). Effects of inbreeding and selection in a closed Holstein-Friesian herd. J. Dairy Sci. 50, 1824-1827.
Thompson J.R., EverettR.W. and Hammerschmidt N.L. (2000a). Effects of inbreeding on production and survival in Holsteins. J. Dairy Sci. 83, 1856-1864.
Thompson J.R., EverettR.W. and Wolfe C.W. (2000b). Effects of inbreeding on production and survival in Jerseys.J. Dairy Sci. 83,2131-2138.
Tohidi R., Vaez Torshizi R., Moradi Shahrbabak M. and Sayadnejad M.B. (2000). Inbreeding and its effects on milk and fat yields of Iranian Holstein. Proceedings of the first seminar on genetics and breeding applied to livestock, poultry and aquatics, March 2000, Karaj, Iran, Pp. 47-53(in Persian with English abstract).
Weigel K.A. (2001). Controlling inbreeding in modern breeding programs. J. Dairy. Sci. 84,E177-E184.
Wiggans G.R., VanRaden P.M. and Zuurbier J. (1995). Calculation and use of inbreeding coefficients for genetic evaluation of the United States dairy cattle. J. Dairy Sci. 78, 1584-1590.
