Milkability traits across milk flow curve types in Sarda sheep

AbstractSince there is not enough data about milkability of the Jersey cows, the aim of this paper is to show basic milkability traits of this cattle breed depending on the parity and milk flow curve types. Cows had average daily production (DMY) of 22.23 kg, milk yield per milking (MYM) of 9.72 kg, and average and maximum milk flow about 1.66 and 2.49 kg/min, respectively. Statistical analysis showed that DMY and MYM of the cows in 4th parity was significantly (p<0.05) higher comparing to cows in 1st and 3th parity. The duration of entirely milking is similar regarding the paritiesand only the cows in 3th and 4th differ significantly (p<0.05). Regarding the effect of milk flow curve, the significant (p<0.05) difference between unspecified and rectangular milk flow curve has been found for the average milk flow (AMF) and descending phase of the milk flow curve (TD). Cows with unspecified milk flow curve, have significantly (p<0.05) lower AMF and longer TD compared to cows with rectangular curve. Cows with bimodal milk flow curve have significantly (p<0.05) longer duration of the ascending phase compering to: unspecified, descending and rectangular. The results of this study have shown that Jersey cows have lower production and milk flow compared to other dairy cattle breeds. Nonetheless, they have uniform milkability traits, and a large representation of desirable milk flow curves which are associated with a beneficial effect on the udder health.

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Connection of milk flow curve to the somatic cell count in bovine milk

Archives Animal Breeding ◽

10.5194/aab-47-551-2004 ◽

2004 ◽

Vol 47 (6) ◽

pp. 551-556 ◽

Cited By ~ 2

Author(s):

P. Mijić ◽

I. Knežević ◽

M. Domaćinović

Keyword(s):

Somatic Cell ◽

Cell Count ◽

Flow Rate ◽

Flow Curve ◽

Somatic Cell Count ◽

Peak Flow ◽

Bovine Milk ◽

Correlation Coefficients ◽

Peak Flow Rate ◽

Milk Flow

Abstract. The modern equipment introduction into cow milking created technical possibilities for studying the milk flow curve and for using the results in cattle selection. In preventing mastitis, besides curing, other parameters of the milk flow curve could be used preventively. Research showed that cows that had the milk flow curve with a short duration of increasing flow rate (dIFR ≤ 0.40 min) and a larger quotient between the peak and down phase (QPD > 1.20) had also the least somatic cell count in milk (LSCC = 3.47, and 3.30 respectively). Such relation is favourable because increasing the relation, the duration of quick and uniform milking extends, and the duration of peak flow rate shortens. That also show correlation coefficients which were between the logarithmic somatic cell count in milk (LSCC) on one hand and the peak flow rate (dPFR), that means the quotient of peak and down phase (QPD) on the other hand negative (r= −0.25** and –0.27**). Breeding-selective procedures could create bull fathers and mothers with the most desirable milk flow curve and the duration of certain milking phases, whereby the somatic cell count in milk would be the least. Therefore it would be necessary to define desirable proportions of the milk flow curve with a special attention to the cow’s health udder.

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The level of udder emptying and milk flow stability in Tsigai, Improved Valachian, and Lacaune ewes during machine milking

Czech Journal of Animal Science ◽

10.17221/5922-cjas ◽

2012 ◽

Vol 57 (No. 5) ◽

pp. 240-247 ◽

Cited By ~ 4

Author(s):

L. Mačuhová ◽

V. Tančin ◽

M. Uhrinčať ◽

J. Mačuhová

Keyword(s):

Milk Production ◽

Flow Curve ◽

Frequency Of Occurrence ◽

Flow Curves ◽

Machine Milking ◽

Milk Flow ◽

Total Milk ◽

The Stability ◽

June July ◽

Daily Milk

The objective of this investigation was to evaluate the stability of milk flow curves and the volume of residual milk in relation to milk flow curves in breeds Tsigai, Improved Valachian, and Lacaune (n = 16 heads per breed) milked twice daily. Milk flow type stability was evaluated at morning milking (stabile milkings) during three successive days in the middle of two months (June, July). After the following fourth morning milking (OT milkings) in both months, oxytocin was injected intravenously at a dose of 2 UI. Afterwards the ewes were milked again in order to remove residual milk. The milk flow curves were classified into four types: 1 peak (1P), 2 peaks (2P), plateau I (maximal milk flow over 0.4 l/min) (PLI), plateau II (maximal milk flow less than 0.4 l/min) (PLII). If all milk flow curves of one animal were of the same type within one month and within both months, respectively, the animal was characterized as the ewe with the stabile type of milk flow. Frequency of occurrence of single milk flow types (1P : 2P : PLI : PLII) during stabile milkings was 42 : 49 : 9 : 0% in June and 51 : 37.5 : 11.5 : 0% in July. 33 ewes (i.e. 69%) had the stabile type of milk flow within both months. But, more than 51% of them had 1P type of milk flow. Milk production varied according to milk flow curve during OT milkings (0.427 ± 0.015, 0.498 ± 0.024, and 0.655 ± 0.035 l for 1P, 2P, and PLI, respectively). The highest percentage of residual milk from total milk yield (RM/TMY) was observed in ewes with 1P (20.29 ± 0.85%), followed by ewes with PLI (12.31 ± 1.99%) and 2P (9.72 ± 1.36%) (P < 0.0001). Lacaune ewes had the lowest amount of residual milk (0.054 ± 0.006 l) and RM/TMY (9.86 ± 1.16%) compared to breeds Tsigai (0.088 ± 0.008 l; 16.47 ± 1.44%) and Improved Valachian (0.069 ± 0.010 l; 15.99 ± 1.78%) indicating their better udder emptying.  

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Association of milk flow curve and prevalence of mastitis pathogens in dairy cows

Indian Journal of Animal Research ◽

10.18805/ijar.b-965 ◽

2018 ◽

Author(s):

Vida Juozaitienë ◽

Lina Juozaitienë ◽

Eglë Èereðkienë ◽

Renata Japertienë ◽

Judita Þymantienë ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Dairy Cows ◽

Flow Curve ◽

Mammary Glands ◽

Flow Curves ◽

Black And White ◽

Milk Flow ◽

Negative Effect ◽

And Staphylococcus Aureus ◽

Mastitis Pathogens

The objective of this work was to evaluate the association of bimodality of milk flow curves with microbiological status of mammary glands and parity of cows. We selected 167 primiparous and 148 multiparous Lithuanian Black and White dairy cows in 2nd to 4th month of lactation. The bimodality of milk flow was determined in 22.2% primiparous and in 38.6% multiparous cows (P less than 0.001). The most prevalent pathogens of mastitis were Staphylococcus aureus (15.3%), other staphylococci (22.2%) and streptococci (5.8%). Prevalence of mastitis pathogens in multiparous cows was 1.4 times and the bimodality of milk flow curves –1.7 times higher in comparison with primiparous cows (P less than 0.001). The bimodality of milk flow curve was mostly associated with the prevalence of Streptococcus agalactiae and Staphylococcus aureus (P less than 0.001). The increased frequency of mastitis pathogens (21.5%) in cows with the bimodal milk flow curves supports the negative effect of bimodality on udder health of cows (P less than 0.001).

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Genetic evaluations for measures of the milk-flow curve in the Italian Brown Swiss population

Journal of Dairy Science ◽

10.3168/jds.2009-2759 ◽

2011 ◽

Vol 94 (2) ◽

pp. 960-970 ◽

Cited By ~ 16

Author(s):

K.A. Gray ◽

F. Vacirca ◽

A. Bagnato ◽

A.B. Samoré ◽

A. Rossoni ◽

...

Keyword(s):

Flow Curve ◽

Brown Swiss ◽

Milk Flow ◽

Swiss Population ◽

Genetic Evaluations

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Absorption of oxygen into solutions of polymers

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19862127 ◽

1986 ◽

Vol 51 (10) ◽

pp. 2127-2134 ◽

Cited By ~ 1

Author(s):

František Potůček ◽

Jiří Stejskal

Keyword(s):

Mass Transfer ◽

Aqueous Solutions ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Flow Rate ◽

Liquid Flow ◽

Flow Curve ◽

Liquid Flow Rate ◽

Polymer Concentration ◽

Newtonian Liquids

Absorption of oxygen into water and aqueous solutions of poly(acrylamides) was studied in an absorber with a wetted sphere. The effects of changes in the liquid flow rate and the polymer concentration on the liquid side mass transfer coefficient were examined. The results are expressed by correlations between dimensionless criteria modified for non-Newtonian liquids whose flow curve can be described by the Ostwald-de Waele model.

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Flow Curve and Microstructure Analysis of a ZK60 Magnesium Alloy during Hot Compression Tests

Metallography Microstructure and Analysis ◽

10.1007/s13632-020-00707-5 ◽

2021 ◽

Author(s):

Weimin Guo ◽

Nan Li ◽

Jixue Zhou ◽

Long Liu ◽

Linan Tian ◽

...

Keyword(s):

Magnesium Alloy ◽

Flow Curve ◽

Hot Compression ◽

Microstructure Analysis ◽

Compression Tests ◽

Zk60 Magnesium Alloy

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Rotational rheometry of liquid metal systems: Measurement geometry selection and flow curve analysis

Journal of Non-Newtonian Fluid Mechanics ◽

10.1016/j.jnnfm.2010.03.009 ◽

2010 ◽

Vol 165 (13-14) ◽

pp. 733-742 ◽

Cited By ~ 13

Author(s):

Mohammad Minhajuddin Malik ◽

Manickaraj Jeyakumar ◽

Mohamed S. Hamed ◽

Michael J. Walker ◽

Sumanth Shankar

Keyword(s):

Liquid Metal ◽

Flow Curve ◽

Curve Analysis ◽

Measurement Geometry

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Shear thickening behavior in dense repulsive and attractive suspensions of hard spheres

Soft Matter ◽

10.1039/d1sm00971k ◽

2021 ◽

Author(s):

Vikram Rathee ◽

Alessandro Monti ◽

Marco Edoardo Rosti ◽

Amy Q Shen

Keyword(s):

Flow Curve ◽

Hard Spheres ◽

Shear Thickening ◽

Colloidal Suspensions ◽

Thickening Behavior ◽

The Stability

Shear thickening in stable dense colloidal suspensions is a reversible phenomenon and no hysteresis is observed in the flow curve measurements. However, a reduction in the stability of colloids promotes...

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Vacuum Dynamics as an Alternative Method for Detection of Bimodal Milk Ejection in Dairy Cows

Animals ◽

10.3390/ani11071860 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1860

Author(s):

Matthias Wieland ◽

Christina Marie Geary ◽

Gloria Gioia ◽

Kerry Lynn Case ◽

Paolo Moroni ◽

...

Keyword(s):

Dairy Cows ◽

Predictive Value ◽

Primary Objective ◽

Cow Milk ◽

Kappa Statistics ◽

Flow Meter ◽

Flow Curves ◽

Cross Sectional ◽

Gold Standard Method ◽

Milk Flow

The primary objective of our study was to assess the ability of a vacuum recorder to detect the presence of bimodal milk flow curves in dairy cows compared with a portable milk flow meter. In a cross-sectional study, 241 individual cow milking observations were analyzed. We simultaneously collected (1) individual cow vacuum events during milking using portable vacuum recorders, and (2) individual cow milk flow curves by attaching a portable milk flow meter to the same milking unit. Presence of bimodality was assessed with the vacuum recorder visually (BIMVA) and with the gold standard method of a milk flow meter through automatic detection (BIMLA). Kappa statistics revealed moderate agreement between BIMVA and BIMLA [κ, 95% confidence intervals (95% CI) = 0.59 (0.46–0.71)]. Diagnostic test statistics for BIMVA for detection of bimodality indicated moderate performance for sensitivity [0.65 (0.52–0.76)] and positive predictive value [0.71 (0.58–0.82)] and high values for specificity [0.92 (0.87–0.95)] and negative predictive value [0.93 (0.84–0.93)]. We conclude that milking vacuum dynamics are a suitable measure to assess bimodal milk flow curves in dairy cows.

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