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Effect of CSN1S1 gene polymorphism and stage of lactation on milk yield and composition of extensively reared goats

Published online by Cambridge University Press:  08 January 2013

Filippo Balia ,
Michele Pazzola ,
Maria Luisa Dettori ,
Maria Consuelo Mura ,
Sebastiano Luridiana ,
Vincenzo Carcangiu ,
Gianpiera Piras  and
Giuseppe Massimo Vacca
Filippo Balia
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
Maria Luisa Dettori*
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
Sebastiano Luridiana
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
Gianpiera Piras
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: mldettori@uniss.it
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Abstract

The effect of CSN1S1 genotype and lactation stage on milk yield and composition were investigated in 80 extensively reared goats. Milk yield was recorded in early, mid and late lactation and individual milk samples were collected to determine: fat, protein, lactose and casein content, pH, freezing point, somatic cell count (SCC) and total microbic mesophilic count (TMC). Relative casein composition and amino acid profile were quantified by HPLC. Fatty acid profile was measured by gas-chromatography. Genotype did not affect milk yield, while this trait was significantly affected by lactation stage (P < 0·01). CSN1S1 BB goats produced significantly higher protein and casein percentages (P < 0·05). αs1-casein (CN) was significantly higher in BB and AB goats than AF and BF, showing intermediate values in AA goats (P < 0·01). The protein percentage and the αs1 and αs2-CN fractions were not affected by lactation stage, while the casein content and the β and κ-CN significantly increased throughout lactation (P < 0·01). C4 : 0 and C6 : 0 were not affected by genotype, while C8 : 0 and C10 : 0 were higher in the AA goats than BB; most of the long chain FA were higher in BB than AA goats. MUFA and PUFA increased in late lactation. In addition, BB goats showed higher essential amino acids, resulting in an optimal composition from the nutritional point of view, when compared with AA goats. The increase of MUFA, PUFA, essential and cis-FA in late lactation indicate that the lipid composition of goat's milk, with the progress of lactation, tends to improve its nutritional value.

Keywords

CSN1S1goatlactationamino acidsfatty acids
Type
Research Article
Information
Journal of Dairy Research , Volume 80 , Issue 2 , May 2013 , pp. 129 - 137
Copyright
Copyright © Proprietors of Journal of Dairy Research 2013

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