<strong>Potravinárstvo</strong> Table 3: Technological properties of Improved Valachian sheep milk depending on β-Lg genotype. β-Lg genetic variant parameter AA (47) AB (88) BB (33) F value (n=168) mean sd mean sd mean sd GV LP GV-LP rennetability (sec) 83,63+ 8,17 102,77 10,06 126,95+ 20,61 0,71 3,34+ 1,13 calcium (mg.100g -1 ) 229,15++ 3,78 215,17++ 1,96 224,44++ 3,39 2,62++ 1,13 1,96 heat stability (ml) 0,58+ 0,03 0,73+ 0,05 0,62 0,05 1,42 3,37+ 0,28 pH 6,52 0,02 6,58 0,02 6,57 0,02 0,05 1,04 0,41 sd=standard deviation, GV=genetic variant, LP=lactation period, + = statistically significant difference (P
CONCLUSION We have confirmed the insignificant effect of the β-Lg genetic variant on the nitrogen distribution in the milk protein and processing properties of milk. It must be also noted that the pleiotropic effect of the milk protein encoding genes on milk composition is probably relatively small and in many cases, due to fairly large genetic variation, it is difficult to prove. This is because milk traits are quantitative traits and in addition to genetic factors they are also affected by many environmental factors, which are often more responsible for variation than genetic makeup. By Mroczkowski et al. (2004) wide differences in the studies on the relationship between milk protein polymorphism and milk performance of sheep result from many factors, such as lack of genetic homogeneity of sheep representing different breeds, the related unequal frequency of genes that condition milk production, differences in the size of the analysed population, and different methods of milk yield determination. REFERENCE ABRAHAMSEN, R. K., BORGE, G. I., HARSTAD, O. M., HAUG, A., WETLESEN, A. 2007. Milk quality – a future approach from a researcher's point of view. In: Journal of Animal and Feed Sciences, vol.16, Suppl. 1, 2007, p. 209-226. AMIGO, L., RECIO, I., RAMOS, M. 2000. Genetic polymorphism of ovine milk proteins: its influence on technological properties of milk – a review. In: International Dairy Journal, vol. 10, 2000, p. 135-149. ANTON, I., ZSOLNAI, A., KUKOVICS, S. ET AL. 1997. Genetic polymorphism of milk proteins in Hungarian dairy sheep breeds and crosses. In: Sheep and Goat production in central and eastern European countries. Proceedings of the workshop held in Budapest, Hungary, 1997, p. 224-226. ANTON, I., ZSOLNAI, A., FÉSÜS, L. ET AL. 1999. Survey of β-lactoglobulin and α S1-casein polymorphism in Hungarian dairy sheep breeds and crosses on DNA level (short communication). In: Arch. Tierz., Dummerstorf, vol. 41, 1999, no. 4, p. 387-392. ANTON, I., ZSOLNAI, A., FÉSÜS, L. 2005. βlactoglobulin and αS1-casein polymorphism in Hungarian sheep breeds and crosses on DNA level. In: Ekologické a ekonomické aspekty využitia poľnohospodársky znevýhodnených plôch chovom malých prežúvavcov. Vrátna dolina, 2005, p. 63-67, ISBN 80-969312-1-0. BENCINI, R. 2001. Factors affecting the quality of ewe's milk. In: Proceeding of the 7 th Great Lakes Sheep Symposium. November 1-3. Wisconsin: EAU claire, 2001, s. 52-83. CVAK, P., PETERKOVÁ, L., ČERNÁ, E. 1992. Chemické a fyzikálněchemické metody v kontrole jakosti mléka mlékarenských výrobku. 1. vyd. Praha: VÚPP, Středisko potravinářských informací. 1992, 221 s., ISBN 80-85120-36- 4. CZERNEKOVÁ, V., KOTT, T., DUDKOVÁ, G. ET AL. 2004. Studium genetického polymorfizmu mléčných bílkovín skotu. In: Celostátní prehlídky syru 2004. Výsledky prehlídek a sborník prednášek seminaře Mléko a sýry 2004, p. 216, ISBN 978-80-86238-42-5. DARIO, C., CARNICELLA, D., BUFANO, G. 2005. Effect of β-lactoglobulin genotypes on ovine milk <strong>Potravinárstvo</strong> composition in Altamurana breed. In: Arch. Zootec., vol. 54, 2005, p. 105-108. FALCONER, D. S., MACKAY T. F. 1996. Introduction to Quantitative Genetics, 4th edition, Longmans Green, Harlow, Essex, UK, 1996. GAJDŮŠEK, S. 1998. Mlékařství II. Brno: Mendelova zemědělská a lesnická univerzita, 1998. p. 125-127. ISBN 80-7157-342-6 GARZON, A. I., MARTINEZ, J. 1992. β-Lg in Manchega sheep breed. Relationship with milk technological indexes in handcraft manufacture of Manchego cheese, XXIII. Int. Conf. Anim. Genet., vol. 23, 1992, supl. 1, p.106. GROSCLAUDE, F. 1995. Genetic polymorphism of milk proteins. In: Bull. Int. Dairy Fed., vol. 304, 1995, p. 2-3. KAŽIMÍR, L.- GEMERI, L. 1993. Návody na cvičenia z Mliekárstva a hodnotenia živočíšnych produktov. I. Mliekárstvo. 3. vyd. Nitra: VŠP, 1993, p. 178. KORMAN, K., PAKULSKI, T., MROCZKOWSKI, S. et al. 2002. Vstępne badania nad określeniem wplywu genotype laktoglobuliny na przydatność mleka do wyrobu sérow podpuszczkowychi serwatkowych. In: Prace I materialy zootechniczne, Zeszyt Specjalny, vol. 14, 2002, p. 85-92. KUČINSKIENE, J., VAGONIS, G., MALEVIČIŪTÉ, J. ET AL. 2005. Genetic polymorphism of β-lactoglobulin in Lithuanian Blackface and Lithuanian Native Coarsewooled sheep. In: Veterinarija ir zootechnika, vol. 51, 2005, no. 29, p. 90-92, ISSN 1392-2130. LÓPEZ-GALVEZ, G., AMIGO, L., RAMOS, M. 1994. Genetic polymorphism of whey proteins in two ovine breeds. In: Milchwissenchaft, vol. 49, 1994, p. 123-125. MARTINEZ-HENS, J., GARZÓN, A., MÉNDEZ, D. ET AL. 1993. Influencia de las variantes genéticas de la βlactoglobulina sobre el pH, caseina total y rendimiento de la cuajada en ovéjas de raza Manchega. In: Arch. Zootec, vol. 42, 1993, p. 245-252. MROCZKOWSKI, S., KORMAN, K., ERHARDT, G. ET AL. 2004. Sheep milk protein polymorphism and its effect on milk performance of Polish Merino. In: Arch. Tierz., vol. 47, 2004, Special Issue, p. 114-121. PELLEGRINI, O., REMEUF, F., RIVEMALE, M. ET AL. 1997. Renneting properties of milk from individual ewes: influence of genetic and non-genetic variables, and relationship with physicochemical characteristics. In: Journal of Dairy Research, vol. 64, 1997, p. 355-366. PILLA, F., DELL'AQUILLA, S., TAIBI, L. ET AL. 1995. Effect of β-lactoglobuline polymorphism on the properties of sheep milk. In: Proc. XI. Congress Associazone Scientifica Produzione Animale. 1995, p. 207-208. PINTADO, M. E., MALCATA, F. X. 1999. Studies on genetic variants of α-lactalbumin and β-lactoglobulin from milk of native Portuguese ovine and caprine breeds. In: International Journal of Food Science and Technology, vol. 34, 1999, p. 245-252. RAMPILLI, M., CECCHI, F., GIULIOTTI, L. ET AL. 1997. The influence of β-lactoglobulin genetic polymorphism on protein distribution and coagulation properties in milk of Massese breed ewes. In: Milk protein polymorphism. Brussels, Belgium: IDF, 1997, p. 311-315 RECIO, I., FERNANDEZ-FOURNIER, A., MARTÍN- ÁLVAREZ, P. J. ET AL. 1997. β-Lactoglobulin polymorphism in ovine breeds: influence on cheesemaking properties and milk composition. In: Lait, vol. 77, 1997b, p. 259-265. ročník 4 63 1/2010
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Vedecký èasopis pre potravinárst
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ÚVOD Pšenica je celosvetovo jedna
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oqueforti (2), P. carneum (1), P. c
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aminokyselín a ión-párového či
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Tab. 2b: pokračovanie. Literatura
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pestovaná aj v Maďarsku, Česku,
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