Estimation of genetic parameters for milk traits in Romanian local sheep breed
Estimation of genetic parameters for milk traits in Romanian local sheep breed
Show authors biography
ABSTRACT
Objective. Estimate the genetic parameters for milk traits in a Romanian local sheep population Teleorman Black Head. Material and methods. Records of 262 sheep belonging to 17 rams and 139 ewes were used in the study. The following traits were investigated: milk yield, fat yield, protein yield, fat percentage and protein percentage. The genetic parameters were estimated using the Restricted Maximum Likelihood method, with a model including maternal effects. Results. The results from our study revealed that direct heritability estimates were moderate for milk yield (0.449), fat yield (0.442), protein yield (0.386) while for protein percentage (0.708) and fat percentage (0.924) were high. The high direct and maternal genetic correlation was between milk yield and protein yield (0.979, 0.973) and between protein yield and fat yield (0.952, 0.913) while the phenotypic correlation between the milk yield and fat yield (0.968), the milk yield and protein yield (0.967), fat yield and protein yield (0.936) was high and positive. Conclusions. The genetic parameters are important in selection program on this breed for genetic improvement.
Article visits 722 | PDF visits
Downloads
- Carta A, Casu S, Salaris S. Invited review: Current state of genetic improvement in dairy sheep. J Dairy Sci 2009; 92:5814-5833. http://dx.doi.org/10.3168/jds.2009-2479
- Oravcova M, Margetin M, Peskovicova D, Dano J, Milerski M, Hetenyi L et al. Factors affecting milk yield and ewe's lactation curves estimated with test-day models. Czech J Anim Sci 2006; 11:483-490.
- Komprej A, Gorjanc G, Kompan D, Kovac M. Covariance components by a repeatability model in Slovenian dairy sheep using test-day records. Czech J Anim Sci 2009; 9:426-434.
- Bauer J, Milerski M, Pribyl J, Vostry L. Estimation of genetic parameters and evaluation of test–day milk production in sheep. Czech J Anim Sci 2012; 57:522-528.
- Mrode RA, Thompson R. Maternal Trait Models: Animal and Reduced Animals Models. Linear models for the prediction of animal Breeding Values. Cabi Publishing UK; 2005.
- Ghafouri-Kesbi F, Baneh H. Genetic parameters for direct and maternal effects on growth traits of sheep. Arch Tierz 2012; 55(6):603-611.
- Rupp R, Lagriffoul G, Astruc JM, Barilet F. Genetic Parameters for milk Somatic Cell Scores and Relationship with production traits in Franch Lacaune Dairy Sheep. J Dairy Sci 2003; 86:1476-1481. http://dx.doi.org/10.3168/jds.S0022-0302(03)73732-1
- Legarra A, Ugarte E. Genetic parameters of Udder Traits, Somatic Cell Score and Milk Yield in Laxta Sheep. J Dairy Sci 2005; 88:2238-2245. http://dx.doi.org/10.3168/jds.S0022-0302(05)72899-X
- Alvarez L, Gutierrez-Gill B, San Primitivo F, De la Fuente FL, Arranz JJ. Influence of prion protein genotypes on milk production traits in spanish Churra Sheep. J Dairy Sci 2006; 89:1784-1791. http://dx.doi.org/10.3168/jds.S0022-0302(06)72247-0
- De Vries F, Hamann H, Drogemuller C, Ganter M, Distl O. Analysis of associations between the prion protein genotypes and production traits in east friesian milk sheep. J Dairy Sci 2005; 88:392-398. http://dx.doi.org/10.3168/jds.S0022-0302(05)72699-0
- Ugarte E. The breeding program of Laxta breed. Biotech Anim Husbandry 2007; 23(5-6):97-111. http://dx.doi.org/10.2298/BAH0701097U
Information
