Hostname: page-component-8448b6f56d-42gr6 Total loading time: 0 Render date: 2024-04-20T01:36:43.060Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of casein and β-lactoglobulin genotypes on renneting properties of milks

Published online by Cambridge University Press:  01 June 2009

Giulio Pagnacco  and
Anna Caroli
Giulio Pagnacco
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinaria, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy
Anna Caroli
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinaria, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy
Get access Rights & Permissions [Opens in a new window]

Summary

The effects of αs1-, β-, κ-casein and β-lactoglobulin genetic variants on rennet clotting time, rate of curd firming and coagulum strength, measured on the individual milks of 306 Rendena cows by a lactodynamographic apparatus, were evaluated statistically, with simultaneous adjustment for environmental and physicochemical factors. The importance of genetic polymorphism was confirmed, especially for the main effects of casein loci: interaction among them was not found to be significant. For κ-casein, BB genotype showed the best coagulation parameters (lower rennet clotting time, a higher rate of curd firming and higher coagulum strength), with AB in an intermediate position for clotting time and rate of curd firming. However, for αs1-casein and β-casein, dominance and overdominance effects between alleles were observed. Herd by genotype interaction was also found to be significant (herd by β-casein) or close to significance level (herd by κ-casein). From the results of the analyses, suggestions for selection programmes have been made.

Type
Original Articles
Information
Journal of Dairy Research , Volume 54 , Issue 4 , November 1987 , pp. 479 - 485
Copyright
Copyright © Proprietors of Journal of Dairy Research 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Aschaffenburg, R. 1966 Modified procedure of starch gel electrophoresis for β-easein phenotyping. Journal of Dairy Science 49 1284–1285CrossRefGoogle Scholar
Aschaffenburg, R. & Michalak, W. 1968 Simultaneous phenotyping procedure for milk proteins–improved resolutions of the β-laetoglobulins. Journal of Dairy Science 51 1849CrossRefGoogle Scholar
Frentz, R. 1965 [Application of Hartert's thromboelastograph to the study of milk coagulation.] Lait 45 489–508CrossRefGoogle Scholar
Grosclaude, F., Pujolle, J., Ribadeau-Dumas, B. & Garnier, J. 1967 [Genetic analysis of the group of structural loci in the synthesis of bovine caseins.] In Biochemical Polymorphisms of Animals pp. 415–420Paris: INRA (European Conference on Animal Blood Groups and Genetic Polymorphism 1966 10)Google Scholar
Helwig, J. T. & Council, K. A. 1979 SAS Users′ Guide. Raleigh, NC: SAS Institute Inc.Google Scholar
Losr, G., Capella, P., Castagnetti, G. B., Grazia, L., Zambonelli, C., Mariani, P. & Russo, X. 1973 [Effect of genetic variants of κ–casein on the formation and characteristics of curd.] Scienza e Tecnologia degli Alimenti 3 373–374Google Scholar
Losi, G., Castagnetti, G. B. & Morini, D. 1975 [Importance of genetic variants of milk proteins for the dairy industry.] Mondo del Latte 29 727–739Google Scholar
Schaar, J. 1984 Effects of κ-casein genetic variants and lactation number on the renneting properties of individual milks. Journal of Dairy Research 51 397–406CrossRefGoogle Scholar
Searle, S. R. 1971 In Linear Models pp. 316–318.New York: John Wiley & SonsGoogle Scholar
Tarodo De La Fuente, B., Alais, C. & Frentz, R. 1969 [Study of the coagulation of milk by rennet and of syneresis of the coagulum using a thromboelastographic method.] Lait 49 400–416CrossRefGoogle Scholar