Asymmetric time interval between evening and morning milking and its effect on the total daily milk yield

Abstract

Samples of milk obtained in the course of evening and morning milking performed in variable time intervals of either 11 and 13 hours (n = 1.282) or 10 and 14 hours (n = 370) were collected with the aim to quantify the effect of the length of a variable (asymmetric) time interval between evening and morning milking on the total amount and composition of daily milk production of dairy cows. Milk samples were analysed in an accredited (EN ISO 17025) laboratory in Brno-Tuřany (Czech Republic) and the following contents of individual milk components were estimated: fat (F; g.100g−1), total protein (TP; g.100g−1), lactose (L; lactose monohydrate; g.100g−1), and somatic cell counts (SCC; ­103.ml−1) were estimated in. It was found out that with the increasing total daily milk production the shares of evening and morning milk yield increased as well; however, the percentages of evening and/or morning yields in the total yield remained practically unchanged and represented 43.5 % and 56.5% or 40.4 % and 59.6 % in variants with intervals of 11 and 13 hours and/or 10 and 14 hours, respectively. In the variant with the milking interval of 11 and 13 hours, values of correlation coefficients between the above parameters (i.e. F, TP, L, SCC, and log SCC) of evening and morning milk yields on the one hand and the total milk performance on the other ranged from the minimum r = 0.896 (F) to the maximum r = 0.980 (TP). In the variant with the interval of 10 and 14 hours, the corresponding values of correlation coefficients were r = 0.848 (F) and r = 0.983 (TP). These correlations were statistically highly significant in all cases (P ≤ 0.001). Further, linear regression equations enabling the estimation of milk parameters of the total milk yield on the base of results obtained in evening and morning milking was calculated as well. Values of coefficients of determination (R2) of these equations ranged from 0.803 (F) to 0.960 (TP) and from 0.718 (F) to 0.966 (TP) for intervals of 11:13 hours and of 10:14 hours, respectively.

Innovation of prediction equations for milk composition estimation in milk recording at alternative sampling and half a day milking interval

“…These showed higher prediction reliability in comparison to non linear dependencies (Fig. 1) at majority of indicators also in previous evaluations (HERING et al, 2010;HANUŠ et al 2011 a, b;CHLÁDEK et al, 2011). As a rule, it was given by higher values of determination coeffi cient, when linear dependence showed higher percentage of variability explanation of dependent variable value of (REF, whole day milking values) by independent variable value variability (values of M and E alternative sampling; Fig.…”

“…Results from recording of partial milkings (M and E) were related to reference (REF) result of MR, it means to whole day milk (HERING et al, 2010;HANUŠ et al, 2011 a, b;CHLÁDEK et al, 2011). Milk indicators such as F, P and L were evaluated in original values.…”

Reliability of Milk Recording Data Under Conditions of Automatic Milking System

“…Result of measurement of milk composition is valid only for milk yield of relevant control day. Chládek et al (2011) found higher correlations for the relationships between morning and evening milk yield and daily milk yield (MR, classic twice a day milking) for asymmetric milking intervals (≥ 0.946, P ≤ 0.001) than were similar correlations …”

Evaluation Of Morning And Evening Milk Traits in Some Dairy Animals in Erbil City

“…Bille et al ( 2009) who reported that milk yield was higher in morning milk instead of evening milk per cow (18 kg to 8 kg) respectively and this can be attributed to a longer resting period at night or between milking often at this stage, rather than the movement of pasture-seeking cow's energy is conserved for milk synthesis. Milk excretion Milk excretion, which contributed to the dilution of the fat content, was generally higher during morning milking due to the longer interval (Chladek et al, 2011). Ozcan et al (2015) found that protein and fat values were higher on summer morning.…”