Inbreeding effects on average daily gains and Kleiber ratios in Guilan province sheep

Document Type : Research Paper

Authors

1 Graduated MS.c Student, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

2 Associate Professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

3 Professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

Abstract

The objective of the present study was to evaluate the effects of inbreeding on growth traits in Guilan province 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) and corresponding Kleiber ratios (KR1, KR2 and KR3, respectively). Data and pedigree information used in this study were collected during 1994 to 2011 by the Agriculture Organization of Guilan Province. The effects of inbreeding rate on the traits investigated (for a change of 1% in inbreeding) were analyzed using the Reg procedure of SAS for type of birth, lamb’s sex and all lambs. The effects of inbreeding on all traits except ADG1 were positive. The regression coefficients of ADG1, ADG2 and KR2 were estimated to be -0.138, 0.101 and 0.0053 g, respectively (P<0.01). The regression coefficients of ADG3 and KR3 were estimated to be 0.071 and 0.0096 g, respectively and were significantly (P<0.05) and also the regression coefficients of KR1 was estimated to be 0.0023 and was non-significant. Inbreeding depression was not observed in the performance of growth traits of Guilan province sheep until now, therefore, it seems that the utilization of mating strategies at the flock could be a suitable approach to maintain the rate of inbreeding under control.

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