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Growth hormone gene variability and its effects on milk traits in primiparous Sarda goats

Published online by Cambridge University Press:  23 April 2013

Maria Luisa Dettori ,
Angela Maria Rocchigiani ,
Sebastiano Luridiana ,
Maria Consuelo Mura ,
Vincenzo Carcangiu ,
Michele Pazzola  and
Giuseppe Massimo Vacca
Maria Luisa Dettori*
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
Angela Maria Rocchigiani
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
Sebastiano Luridiana
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
Maria Consuelo Mura
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
Vincenzo Carcangiu
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
Michele Pazzola
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
Giuseppe Massimo Vacca
Affiliation:
Dipartimento di Medicina Veterinaria, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy
*
*For correspondence; e-mail: [email protected]
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Abstract

The aim of this research was to investigate variability in each of the five exons of the caprine growth hormone (gGH) gene, in order to establish the possible relationships with milk traits in Sarda breed goat. The general linear model procedure was used to analyse the effects of the single strand conformation (SSCP) profiles on milk traits of 100 lactating goats. Analysis of conformational polymorphism at exons 1–5 revealed a total of 25 differing banding patterns. Sequencing revealed 21 nucleotide changes (compared with GenBank D00476): 14 were polymorphic and 7 monomorphic; 19 in exonic regions, 5 of which were nonsynonymous. A SNP upstream of the transcription initiation codon (c.-3A>G) and an indel (c.*29_30insC) in the 3′UTR, were detected. Alignment of 4 cloned sequences including the entire gGH gene led to the identification of 22 nucleotide variations within the intron regions, including two indels. Association analysis revealed that each exon, except exon-1, affected milk yield, exons 1 and 3 influenced milk fat percentage, and all exons, except exon-2, had an effect on protein percentage, supporting previous results in livestock. The variability detected at the caprine GH gene might provide useful information for the phylogeny of ruminants and, more importantly, have implications on the biological function of the growth hormone and on those traits resulting from its physiological action, including milk production and composition. The caprine GH gene may become a useful molecular marker for a more effective genetic selection for milk production traits in goats.

Keywords

Goatgrowth hormonegGH genegenotypepolymorphism
Type
Research Article
Information
Journal of Dairy Research , Volume 80 , Issue 3 , August 2013 , pp. 255 - 262
Copyright
Copyright © Proprietors of Journal of Dairy Research 2013 

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