STUDY ON BLOOD BIOCHEMISTRY IN RELATION TO MILK PROTEIN WITH SPECIAL REFERENCE TO KAPPA CASEIN IN INDEGENOUS GOAT
Loading...
Date
2010
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
AAU, Anand
Abstract
Caprine casein genes exiiibit an unusual and extensive polymorphism that affects milk quality and composition. The Kappa casein gene includes 5 exons, 4 of them carrj'ing more than 90 per cent of the information to encode for the mature protein. Caseins comprise about 80 per cent of the total protein content of milk and present polymorphism with changes in the amino acid sequence. Within this abundance of proteins. Kappa casein is noteworthy, since it has been associated with differences in milk yield, composition and processing. The objective of this study was to observe the existence of polymorphism in the Kappa casein gene and to compare the levels of plasma and milk biochemical parameters in lactation stage of Zalawadi goats. For this purpose, blood samples from 50 lactating goats, collected with vacutainer by needle puncture of the jugular vein. Plasma separated from blood and cellular parts (WBCs) was used for genomic DNA extraction. Milk samples were collected in glass test tube (50 ml capacity) v^ith boric acid preservative and milk samples were preserved at -20 °C till laboratory analyses. The milk biochemical profiles were estimated by using the ECOMILK analyzer and milk urea nitrogen and total casein were estimated by Auto method and kjeidahl method, respectively. The blood biochemical profiles were estimated by using the BS 120 CHEMISTRY analyzer. Plasma sodium and potassium were measured by Flame photometer. DNA was extracted from cellular part of blood. Goat Kappa Casein (CSN3) gene (exon 4) was amplified from genomic DNA samples by PCR. The PCRs were carried for the amplification of Kappa casein {CSN3) gene with specific primers (F: - 5' TCC CAA TGT TOT ACT TTC TTA ACA TC 3') and (R: - 5' GCG TTG TCC TCT TTG ATG TCT CCT TAG 3') gene loci. Amplified products were visualized as a single compact band of expected size of 645bp under UV light by gel documentation system. PCR products and restriction enzymes were incubated overnight in water bath at 37 °C for digestion with Haelll and Alw441 RE and at 65 °C for digestion with BseNI RE. Digested products were visualized as per restriction patterns with compact band size under UV light by gel documentation system. There were monomorphic restriction patterns with HaeIII-RFLP digestion, whereas polymorphic restriction patterns shown with BseeNI-RFLP and Alw44I-RFLP. In this study, genotypes AA, AG, GG ware observed with BseNI and CC, CT, TT with Alw44I in these animals except HaeIII RFLP. The frequency of allele A and allele G was 0.87 and 0.13, respectively and the frequency of allele C and allele T was 0.88 and 0.12, respectively. There were non-significant and positive correlations between blood glucose with milk fat, plasma total proteins with milk protein and milk casein and plasma total cholesterol with milk fat. There was non-significant and negative correlation between plasma triglycerides with milk fat. There was highly significant (P<0.01) and positive correlation between blood urea nitrogen and milk urea nitrogen.
Description
Keywords
ANIMAL PHYSIOLOGY AND BIOCHEMISTRY, A STUDY