RT Journal Article
SR Electronic
A1 Chládek, Gustav
A1 Falta, Daniel
A1 Komzáková, Irena
A1 Hanuš, Oto
A1 Jedelská, Radoslava
A1 Hering, Pavel
A1 Králíček, Teodor
T1 Correlation between whole and partial milk yields of dairy cows milked using the automatic milking system
JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
YR 2014
VO 57
IS 5
SP 149
OP 158
DO 10.11118/actaun200957050149
UL https://acta.mendelu.cz/artkey/acu-200905-0017.php
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.