The aim of this study was to investigate whether proerties of milk from Girgentana goats of different as1-CN genotypes were affected by the energy intake at pasture. Thirty six goats were genotyped at as1-CN locus using several genomic techniques and milk protein analysis. Eight genotypes associted with low (FF, 2 goats), medium (AF, AN, BF, BN, 21 goats) and high (AA, AB, BB, 13 goats) as1-CN level have beed typed. The increase in energy intake (E) of goats from low (<1.8 Mcal/d) to medium (1.82.0 Mcal/d) and high level (>2.0 Mcal/d) corresponded to an increasing dry matter intake, diet CP percentage, milk yield and clotting parameters, and a reduction in milk fat. Depending on genotypes linked to increasign as1-CN, milk was higher in casein, curd firming time and curd firmness. Significant interaction between the effect of energy intake and as1-CN genotype was found for curd firming time and curd firmness, suggesting that changes in milk properties caused by feeding regimen could be different for goats differing in as1-CN genotype
Bonanno, A., Finocchiaro, R., Di Grigoli, A., Sardina, M.T., Tornambè, G., Gigli, I. (2007). Energy intake effects at pasture on milk production and coagulation properties in girgentana goats with different as1-cn genotypes. In Proceedings of International Symposium of the 25th International Goat Association (IGA) - 24-26 May 2007, Bella, Italy (pp.191-194).
Energy intake effects at pasture on milk production and coagulation properties in girgentana goats with different as1-cn genotypes
BONANNO, Adriana;FINOCCHIARO, Raffaella;DI GRIGOLI, Antonino;SARDINA, Maria Teresa;TORNAMBÈ, Gabriele;
2007-01-01
Abstract
The aim of this study was to investigate whether proerties of milk from Girgentana goats of different as1-CN genotypes were affected by the energy intake at pasture. Thirty six goats were genotyped at as1-CN locus using several genomic techniques and milk protein analysis. Eight genotypes associted with low (FF, 2 goats), medium (AF, AN, BF, BN, 21 goats) and high (AA, AB, BB, 13 goats) as1-CN level have beed typed. The increase in energy intake (E) of goats from low (<1.8 Mcal/d) to medium (1.82.0 Mcal/d) and high level (>2.0 Mcal/d) corresponded to an increasing dry matter intake, diet CP percentage, milk yield and clotting parameters, and a reduction in milk fat. Depending on genotypes linked to increasign as1-CN, milk was higher in casein, curd firming time and curd firmness. Significant interaction between the effect of energy intake and as1-CN genotype was found for curd firming time and curd firmness, suggesting that changes in milk properties caused by feeding regimen could be different for goats differing in as1-CN genotype
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