Inbreeding Effects on Average Daily Gains and Kleiber Ratios in Iranian Moghani Sheep

Document Type : Research Article

Author

Department of Animal Science, Faculty of Agriculture Science, University of Guilan, Rasht, Iran

Abstract

The objective of the present study was to evaluate the effects of inbreeding on average daily gains and Kleiber ratios in Moghani sheep. Traits included average daily gain from birth to 3 months (ADG1), average daily gain from birth to 6 months (ADG2), average daily gain from 3 months to 6 months (ADG3), average daily gain from 3 months to 9 months (ADG4), average daily gain from 3 months to yearling (ADG5) and corresponding Kleiber ratios (KR1, KR2, KR3, KR4 and KR5, respectively). Data and pedigree information used in this study were collected at the Breeding Station of Moghani sheep during 1987-2005. All the animals were grouped into three classes according to the inbreeding coefficients obtained by their pedigree: the first class included non-inbred animals (F=0%); and the second and third classes included inbred animals (00.10, respectively). There were significant regression coefficients of ADG5 and KR5 on inbreeding of all lambs for changing 1% inbreeding (P<0.01). Indeed, there were significant regression coefficients of ADG3 (P<0.01) and KR3 (P<0.05) on inbreeding of twin-born lambs for a change of 1% in inbreeding. In addition, there were significant regression coefficients of ADG1 (P<0.05) and ADG5 (P<0.05) on inbreeding of male lambs and significant regression coefficient of ADG2 (P<0.05) on inbreeding of female lambs for a change of 1% in inbreeding. Effects of inbreeding on average daily gains and Kleiber ratios in Moghani sheep was not very pronounced in the flock. Planned matings are, however, suggested to avoid accumulation of inbreeding and appearance of its deleterious effects.

Keywords


Analla M., Montilla J.M. and Serradilla J.M. (1998). Analyses of lamb weight and ewe litter size in various lines of Spanish Merino sheep. Small Rumin. Res. 29, 255-259.
BarczakE., Wolc A., Wojtowski J., Slosarz P. and Szwaczkowski T. (2009). Inbreeding and inbreeding depression on body weight in sheep. J. Anim. Feed Sci. 18, 42-50.
BoichardD., Maignel L. and Verrier E. (1997). The value of using probabilities of gene origin to measure genetic variability in a population. Genet. Sel. Evol. 29, 5-23.
DarioC. and Bufano G. (2003). Efecto de la endogamia sobre la producción láctea en la raza ovina Altamurana (effect of inbreeding on milk production in Altamurana sheep breed). Arch. De Zootec. 52, 401-404.
ErcanbrackS.K. and Knight A. (1991). Effects of inbreeding on reproduction and wool production of Rambouillet, Targhee, and Columbia ewes. J. Anim. Sci. 69, 4734-4744.
Ghavi Hossein-Zadeh N. and Ardalan M. (2010). Estimation of genetic parameters for body weight traits and litter size of Moghani sheep, using Bayesian approach via Gibbs sampling. J. Agr. Sci. 148, 363-370.
HussainA., Akhtar P., Ali S., Younas M. and Shafiq M. (2006a). Effect of inbreeding on pre-weaning growth traits in Thalli sheep. Pak. Vet. J. 26(3), 138-140.
HussainA., Akhtar P., Ali S., Younas M. and Javed K. (2006b).Inbreeding effects on post-weaning growth traits of Thalli sheep in Pakistan. Pak. J. Agric. Sci. 43(1-2), 89-92.
KhanM.S., Ali A., Hyder A.U. and Chatta A.I. (2007). Effect of inbreeding on growth and reproduction traits of Beetal goats. Arch. Tierz. 50, 197-203.
LambersonW.R. and Thomas D.L. (1984). Effects of inbreeding in sheep: a review. Anim. Breed. Abstr. 52, 287-297.
NegussieE., Abegaz S. and Rege J.E.O. (2002). Genetic trend and effects of inbreeding on growth performance of tropical fat-tailed sheep. Pp. 25-35 in Proc. 7th World Congr. Gen. Appl. Livest. Prod., Montpellier, France.
NorbergE. and Sørensen A.C. (2007). Inbreeding trend and inbreeding depression in the Danish populations of Texel, Shropshire, and Oxford down. J. Anim. Sci. 85, 299-304.
PedrosaV.B., Santana Jr.M.L., Oliveira P.S., Eler J.P. and Ferraz J.B.S. (2010). Population structure and inbreeding effects on growth traits of Santa Inês sheep in Brazil. Small Rumin. Res. 93, 135-139.
SargolzaeiM., Iwaisaki H. and Colleau J.J. (2006). CFC: a tool for monitoring genetic diversity. Proc. 8th World Congr. Genet. Appl. Livest. Prod., CD-ROM Communication 27-28. Belo Horizonte, Brazil.
SASInstitute. (2002). SAS User’s Guide v. 9.1. Statistics. SAS Institute, Inc., Cary, NC.
ScholtzM.M. and Roux C.Z. (1988). The Kleiber ratio (growth rate/metabolic mass) as possible selection criteria in the selection of beef cattle. Pp. 373-375 in Proc. 3rd World Cong. on Sheep and Beef Cattle Breed, Paris, France.
SelvaggiM., Dario C., Peretti V., Ciotola F., Carnicella D. and Dario M. (2010). Inbreeding depression in Leccese sheep. Small Rumin. Res. 89, 42-46.
Shodja J., Nosrati M., Alijani S. and Pirani N. (2006). Estimation of genetic and phenotypic parameters for body weight at different ages and yearly wool production in Moghani sheep. Knowl. Agric. 57, 153-162.
TedeschiL.O., Fox D.G., Baker M.J. and Kirschten D.P. (2006). Identifying differences in feed efficiency among group-fed cattle. J. Anim. Sci. 84, 767-776.
Van Wyk J.B., Fair M.D. and Cloete S.W.P. (2009). Case study: the effect of inbreeding on the production and reproduction traits in the Elsenburg Dormer sheep stud. Livest. Sci. 120, 218-224.
WeigelK.A. (2001). Controlling inbreeding in modern breeding programs. J. Dairy Sci. 84, 177-184.
WocacR.M. (2003). On the importance of inbreeding at Tauernschecken goats. Arch. Tierz. 46, 455-469.