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

Mijić, Pero; Knežević, Ivan; Domačinović, Matija

doi:10.5194/aab-47-551-2004

Cited by 9 publications

(9 citation statements)

References 9 publications

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“…The weak correlation (−0.05) between milking duration and SCS in the present study is consistent with previous studies in Italian Holstein-Friesian dairy cows (−0.05; Samoré et al, 2011) and Italian Brown Swiss cows (−0.02; Gray et al, 2011) as well as in Irish dairy cows of alternative breeds (−0.09; Prendiville et al, 2010) and Croatian Holstein-Friesian cows (−0.08; Miji et al, 2004). Weak phenotypic correlations (0.02 to 0.06) have also been reported between SCS and subjectively scored milking speed (Boettcher et al, 1998); for the subjective measures of milking speed, a higher phenotypic value reflects faster milking.…”

supporting

confidence: 95%

“…Irrespective of the definition of milking duration or milking speed, most studies appear to agree that faster-milking animals have greater SCS, which may be due to decreased tension of the teat sphincter muscle, thereby providing a weaker barrier to infection. Corroborating the weak correlations between both AMF and MMF rate with SCS in the present study (−0.08 to 0.01), weak correlations (−0.03 to 0.13) were also reported between the flow rate traits and SCS in other dairy cow populations (Miji et al, 2004;Prendiville et al, 2010;Gray et al, 2011;Samoré et al, 2011). Grindal and Hillerton (1991) reported greater mastitis incidence in quarters with greater milk peak flow rates.…”

supporting

confidence: 59%

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Factors associated with milking characteristics in dairy cows

Berry

Coughlan²,

Enright³

et al. 2013

Journal of Dairy Science

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Milking characteristics, and in particular milking duration, are a known contributor to costs in dairy production systems. Results from previous studies suggest that higher-yielding animals, on average, milk for a longer duration. Culling or selection for reduced milking duration alone may, therefore, reduce milk yield. Here, we propose 2 new traits, residual milking duration (RMD) and residual milking duration including somatic cell score (RMDS). Residual milking duration is represented by the residuals from a least squares regression of milking duration on milk yield; RMDS is represented by the residuals from a least squares regression of milking duration on both milk yield and somatic cell score [i.e., logarithm (base 10) of somatic cell count]. The mathematical properties of least squares regression ensure than the residual traits are independent from the regressor variables, or, in other words, RMDS is not correlated with either milk yield or somatic cell score. Both RMD and RMDS were defined using electronically measured individual cow milking duration from 235,036 part-day milking events from 74,607 cows from 1,075 Irish dairy herds. Twenty-four percent of the variation in milking duration was explained by the multiple regression model containing both milk yield and somatic cell score. The phenotypic standard deviation of RMD and RMDS was 102.2 and 98.2s, respectively, suggesting large variation in milking duration independent of milk yield (and somatic cell score). The correlation of RMD and RMDS with average milk flow rate, which may also be considered a measure of milking efficiency, was -0.74 and -0.75, respectively. Neither RMD nor RMDS was correlated with somatic cell score. However, average milk flow rate was correlated with milk yield (0.57) and milking duration (-0.38). Both RMD and RMDS are useful traits, which exhibit considerable variation and, therefore, can be used by farmers to identify phenotypically slower milking animals irrespective of milk yield (and somatic cell score). However, because of the lack of a correlation between RMD and somatic cell score in the sample population used in the present study, RMD and RMDS values per milking were almost identical.

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supporting

confidence: 95%

supporting

confidence: 59%

Factors associated with milking characteristics in dairy cows

Berry

Coughlan²,

Enright³

et al. 2013

Journal of Dairy Science

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“…Other advantages of ultrasonography for evaluating intramammary tissues are its ease of use and being non‐invasive 8,12,16–18 . Ultrasonographic techniques can be used to determine the intramammary factors that may lead to the development of mastitis and these factors should be taken into consideration in the control and prevention of mastitis 13,16,19–22 …”

mentioning

confidence: 99%

“…8,12,[16][17][18] Ultrasonographic techniques can be used to determine the intramammary factors that may lead to the development of mastitis and these factors should be taken into consideration in the control and prevention of mastitis. 13,16,[19][20][21][22] The objective of the current study was to determine the relationship between ultrasonographic udder and teat measurements and California Mastitis Test (CMT) scores. In addition, the effects of breed, age, number of lactations, the lactation period, udder lobe (front, rear), pregnancy, and CMT score on these measurements were evaluated.…”

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confidence: 99%

Relationship between California Mastitis Test score and ultrasonographic teat measurements in dairy cows

et al. 2009

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“…Several reports (e.g. NAUMANN et al, 1998;RUPP and BOICHARD, 1999;NAUMANN and FAHR, 2000;MIJC et al, 2004), concluded that milking ease was found to be low inheritable and unfavorably correlated with udder health. Desirable high milking speed (or milking ease) has been reported to be associated with an undesirable high somatic cell count (SEYKORA and MCDANIEL, 1986;BOETTCHER et al, 1998;MIJC et al, 2004).…”

mentioning

confidence: 99%

Genetic and permanent environmental variations in daily milk yield and milk flow rates in Hungarian Holstein Friesian

Amin

2007

Arch. Anim. Breed.

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Abstract. Random regression animal model was applied for analyzing the relationships between test-day milk yields (DY), and milk flow rate (FR). The current study involved 169,491 sample test-day records of Hungarian Holstein- Friesian cows. A quadratic random regression was applied for declaring additive genetic variances in all studied traits during biweekly observations across the first three parities. Estimates of heritability for test-day milk yield and udder milk flow rates ranged from 0.09 to 0.58 and from 0.02 to 0.50, respectively through 42 milk-weeks (Wk). The highest heritability estimates occurred during the end of trajectory for both traits. In general DY tended to be more heritable than FR across lactation except during the first few weeks of lactation. Performance of DY was less affected by environmental variation than FR, while both values were moderate to high (0.63 to 0.75). Correlations among measurements showed that additive correlations (Ra) of 4WkFR with the reminder part of lactation were high during early and late lactation. Also 24WkFR was more genetically correlated with next measures and reached Ra = 0.94. Whereas 42WkFR was high additively correlated with other biweekly measurements and ranged from 0.53 to 0.99. Performance of early and late DY was negative additively correlated and ranged from −0.03 to −0.53. Heritability of DY within levels of FR ranged from 0.09 to 0.33 within very slow and medium milk flow, respectively. Correlations among both traits increased linearly toward lactation end. DY during 24Week and 42Week of lactation accounted the highest additive correlations with FR across lactation. Estimated breeding values for DY and FR increased in different rates with progressing lactation. These results may indicate that individual selection results would be favorably achieved during the late part of lactation. More details about estimates of breeding values, estimates of permanent environmental and additive genetic correlations for all traits were tabulated.

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

Cited by 9 publications

References 9 publications

Factors associated with milking characteristics in dairy cows

Factors associated with milking characteristics in dairy cows

Relationship between California Mastitis Test score and ultrasonographic teat measurements in dairy cows

Genetic and permanent environmental variations in daily milk yield and milk flow rates in Hungarian Holstein Friesian

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