PT  - JOURNAL ARTICLE
AU  - Chládek, Gustav
AU  - Falta, Daniel
AU  - Komzáková, Irena
AU  - Hanuš, Oto
AU  - Jedelská, Radoslava
AU  - Hering, Pavel
AU  - Králíček, Teodor
TI  - Correlation between whole and partial milk yields of dairy cows milked using the automatic milking system
DP  - 2014 Oct 10
TA  - Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
PG  - 149--158
VI  - 57
IP  - 5
AID - 10.11118/actaun200957050149
IS  - 12118516
AB  - The objective was to quantify the correlations between milk indicators of partial milk yields and whole milk output; we analysed 576 milk samples taken from 2 to 4 partial milk yields of 156 Holstein dairy cows milked using the automatic milking system (AMS). In the accredited (EN ISO 17025) milk laboratory in Brno-Tuřany the samples were analysed for the content of fat (T; g.100g<sup>-1</sup>), crude protein (B; g.100g<sup>-1</sup>), lactose (L; lactose monohydrate; g.100g<sup>-1</sup>) and somatic cell count (SCC; 10<sup>3</sup>.ml<sup>-1</sup>). The average values in the whole milk output were as follows: T = 3.69 g.100g<sup>-1</sup>, B = 3.39 g.100g<sup>-1</sup>, L = 4.92 g.100g<sup>-1</sup>, PSB = 345.10<sup>3</sup> ml<sup>-1</sup> and log SCC = 1.9695, at a whole milk output of 29.88 kg.day<sup>1</sup> of milk. The correlation coefficients between the milk indicators (T, B, L, PSB and log PSB) of partial milk yields and whole milk output ranged from the minimum r = 0.786 (between the content of T in the whole and 3<sup>rd</sup> milk yield) to the maximum r = 0.979 (between the content of B in the whole milk output and identically in the 1<sup>st</sup>, 3<sup>rd</sup> and 4<sup>th</sup> milk yields) and in all cases they were statistically highly significant (P ≤ 0.001). Next we calculated the regression equations for the estimation of milk indicators of the whole milk output from milk indicators of the 1<sup>st</sup> to 4<sup>th</sup> partial milk yields.