SciELO - Scientific Electronic Library Online

 
vol.43 issue2Fodder production and bromatological composition of genomic combinations in elephant grass and pearl milletA conceptual proposal for self-propelled açai (Euterpe oleracea Mart.) harvesters for the amazon region author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Revista Ciência Agronômica

On-line version ISSN 1806-6690

Abstract

IRANO, Natália et al. Genetic parameters for milk yield in Saanen and Alpina breed goats. Rev. Ciênc. Agron. [online]. 2012, vol.43, n.2, pp.376-381. ISSN 1806-6690.  http://dx.doi.org/10.1590/S1806-66902012000200022.

The objective of this study was to estimate genetic parameters for 305 days milk yield (M305) in Saanen and Alpina breed goats. Data consisted of records from first to second lactations of goats belonging to herds participating in the program control productive and reproductive goats (PROCAPRI) from UNESP-FCAV-Jaboticabal-SP. The M305 was analyzed by repeatability and bi-trait models. The influence of fixed effects on the traits was analyzed preliminary analysis by the method of least squares. Variance components were estimated by restricted maximum likelihood method (REML), using the package Wombat. The duration of lactation, age of dam at calving, the herd, calving year and season of birth were important sources of variation for the M305. There was no significant difference between the breeds. Heritability and repeatability estimates obtained by repeatability model were 0.29 and 0.36, respectively. The repeatability estimate was 0.32. The heritability estimates obtained by the bi-trait models were similar and repeatability. Thus, a repeatability model might be indicated for its simplicity.

Keywords : Goat-milk production; Animal genetics; Goat milk.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License