A relationship between somatic cell count, polymorphic form of β4-defensin and susceptibility of cow milk fat to lipolysis
Journal Title: Animal Science Papers and Reports - Year 2014, Vol 32, Issue 4
Abstract
The aim of this study was to evaluate the effects of somatic cell count and the polymorphic form of β4-defensin on the concentration of free fatty acids (FFA) and physico-chemical characteristics of cow’s milk. The study was carried out on 120 Polish Holstein-Friesian Black and White dairy cows. The animals were maintained in a loose barn and fed with the TMR system according to the INRA norm. The animals were divided into groups according to their polymorphic form of the defensin β4 gene: 1st – CT (def-1); 2nd – CC (def-2) and into two groups in terms of their somatic cell count: 1st - <3×105 (SCC-1) and 2nd – 3×105 – 6×105 (SCC-2) cell/ml. Milk samples were collected once a month during the whole lactation. Chemical composition and some physico-chemical parameters of milk were determined by automated infrared analysis with a Milkoscan FT2 instrument. SCC were evaluated using BactoCaunt IBCm. A relationship was found between polymorphic forms of the defensin gene and the level of FFA in milk directly after milking (CT<CC). The chemical composition of milk and its physicochemical parameters differed significantly between the identified genetic variants of defensin β4: fat (CT<CC), total protein (CT<CC), casein (CT<CC), total solids (CT<CC) and solids-non-fat (CT<CC). Cows from the SCC-1 group produced milk characterised not only by lower susceptibility to lipolysis, but also a higher concentration of the basic components. High positive correlations were found between the basic milk parameters (with the exception of lactose) and the FFA concentration. The results indicate that fat lipolysis of cows’ milk is determined both by the somatic cell count and by the polymorphic form of β4-defensin.
Authors and Affiliations
Nina Strzałkowska, Artur Jóźwik, Ewa Poławska, Żaneta Zdanowska-Sąsiadek, Emilia Bagnicka, Bożena Pyzel, Paulina Lipińska, Jarosław O. Horbańczuk
Keywords
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