Advanced SearchSearch Tips
Genetic (Co)variance Components for Body Weight and Body Measurements in Makooei Sheep
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Genetic (Co)variance Components for Body Weight and Body Measurements in Makooei Sheep
Abbasi, Mokhtar-Ali; Ghafouri-Kesbi, Farhad;
  PDF(new window)
The aim of this paper was to estimate genetic parameters for body weight and five body measurements for an experimental population of Iranian Makooei sheep maintained at the Makooei Sheep Breeding Station at Makoo, Iran. To do this, yearling live weight (YW), and five body measurements, i.e., body length (BL), heart girth (HG), height at withers (HW), height at back (HB) and scrotal circumference (SC), were analyzed in a multi-trait animal model using the DXMUX program of DFREML software package. Heritability estimates were , , , , and for YW, BL, HG, HW, HB and SC, respectively. These estimates indicate that selection in Makooei sheep would generate moderate genetic progress in body weight and body measurements. Scrotal circumference, as an indicator of reproductive potential, exhibited the highest heritability. This trait, therefore, could successfully be used to increase productivity of males and, indirectly, female fertility. Genetic correlations between traits studied were all positive and ranged from 0.15 (YW/HB) to 0.99 (HW/HB). Phenotypic correlations were also positive and ranged from moderate (0.32, HW/SC) to high (0.94, HW/HB). Positive genetic and phenotypic correlations indicate that improvement in body measurements both at the genetic and phenotypic levels is expected through selection on body weight and vice versa.
Body Weight;Body Measurement;Sheep;Animal Model;REML;Heritability;
 Cited by
Al-Shorepy, S. A. and D. R. Notter. 1996. Genetic variation and covariation for ewe reproduction, lamb growth and lamb scrotal circumference in a fall-lambing sheep flock. J. Anim. Sci. 74:1490-1498.

Bathaei, S. S. and P. L. Leroy. 1998. Genetic and phenotypic aspects of the growth curve characteristics in Mehraban Iranian fat-tailed sheep. Small Rumin. Res. 29:261-269. crossref(new window)

Blackmore, D. W., L. D McGulliard and J. L. Lush. 1958. Genetic relationship between body measurements at three ages in Holstein. J. Dairy Sci. 41:1045-1049. crossref(new window)

Bose, S. and S. B. Basu. 1984. Relationship between body measurements and meat production in Beetal goats. Ind. Vet. J. 61:670-673.

Bourdon, M. R. and J. S. Brinks. 1986. Scrotal circumference in yearling Hereford bulls: Adjustment factors, heritabilities and genetic, environmental and phenotypic relationships with growth traits. J. Anim. Sci. 62:958-967.

Duguma, G., S. W. P. Cloete, S. J. Schoeman and G. F. Jordaan. 2002. Genetic parameters of testicular measurements in Merino rams and the influence of scrotal circumference on total flock fertility. S. Afr. J. Anim. Sci. 32:76-80.

Fogarty, N. M. 1995. Genetic parameters for live weight, fat and muscle measurements, wool production and reproduction in sheep: a review. Anim. Breed. Abs. 63:101-143.

Fogarty, N. M., D. D. Lunstra, L. D. Young and G. E. Dickerson. 1980. Breed effects and heritability of testis measurements in sheep. J. Anim. Sci. 51 (Suppl. 1):117.

Fourie, P. J., F. W. C. Neser, J. J. Olivier and C. V. Der Westhuizen. 2002. Relationship between production performance, visual appraisal and body measurements of young Dorper rams. S. Afr. J. Anim. Sci. 32:256-262.

Hahn, J., R. H. Foote and G. E. Jr. Seidel. 1969. Testicular growth and related sperm output in dairy bulls. J. Anim. Sci. 29:41-47.

Horstick, A. 2001. Populationagenetische Untersuchung von Milchleistungs und Exterieurmerkmalen beim ostFriesischen und swarzbraunen Milchschaf. Ph.D. Thesis. Nannover. p. 254.

Janssens, S. and W. Vandepitte. 2004. Genetic parameters for body measurements and linear type traits in Belgian Blue du Maine, Suffolk and Texel sheep. Small Rumin. Res. 54:13-24. crossref(new window)

Mandal, A., R. Roy and P. K. Rout. 2008. Direct and maternal effects for body measurements at birth and weaning in Muzaffarnagari sheep of India. Small Rumin. Res. 75:123-127. crossref(new window)

Matos, C. A. P. and D. L. Thomas. 1992. Physiology and genetics of testicular size in sheep: a review. Livest. Prod. Sci. 32:1-30. crossref(new window)

Matos, C. A. P., D. L. Thomas, T. C. Nash, D. F. Waldron and J. M. Stookey. 1992. Genetic analyses of scrotal circumference, size and growth in Rambouillet lambs. J. Anim. Sci. 70:43-50.

Meyer, K. 2000. DFREML. Programs to estimate variance components for individual animal models by Restricted Maximum Likelihood (REML). Ver .3.1. Users notes. Animal Genetics and Breeding Unit. University of New England, Armidle.

Miraei-Ashtiani, S. R., S. A. R. Seyedalian and M. Moradi Shahrbabak. 2007. Variance components and heritabilities for body weight traits in Sangsari sheep, using univariate and multivariate animal models. Small Rumin. Res. 67:271-278. crossref(new window)

Mohammed, I. D. and J. D. Amin. 1996. Estimating body weight from morphometric measurements of Sahel (Borno White) goats. Small Rumin. Res. 24:1-5.

Notter, D. R., J. R. Lucas and F. S. McClaugherty. 1981. Accuracy of estimation of testis weight from in situ testis measures in ram lambs. Theriogenology 15:227. crossref(new window)

Salako, A. E. 2006a. Application of morphological indices in the assessment of type and Function in sheep. Int. J. Morph. 24:8-13.

Salako, A. E. 2006b. Principal component factor analysis of the morphostructure of immature Uda sheep. Int. J. Morph. 24: 571-574.

SAS Institute Inc. 2004. SAS/STAT User's Guide: Version 9. SAS Institute Inc., Cary, North Carolina.

Smith, B. A., J. S. Brinks and G. V. Richardson. 1989. Relationships of sire scrotal circumference to offspring reproduction and growth. J. Anim. Sci. 67:2881-2885.

Snyman, M. A., G. J. Erasmus, J. B. VanWyk and J. J. Olivier. 1995. Direct and maternal (co)variance components and heritability estimates for body weight at different ages and fleece traits in Afrino sheep. Livest. Prod. Sci. 44:229-235. crossref(new window)

Tavakkolian, J. 1999. The genetic resources of native farm animals of Iran. Animal Science Research Institute of Iran Press, Karaj, Iran.