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Effect of liner design, pulsator setting, and vacuum level on bovine teat tissue changes and milking characteristics as measured by ultrasonography.

Gleeson DE, O'Callaghan EJ, Rath MV - Ir Vet J (2004)

Bottom Line: Milk yield per cow was significantly (P < 0.05) higher and cluster-on time was reduced (P < 0.01) with the WB cluster as compared to the NB1 cluster.Widening pulsator ratio from 60:40 to 67:33 did not have negative effects on changes in teat tissue and had a positive effect on milk yield and milking time.Milk liner design had a bigger effect on teat tissue changes and milking characteristics than pulsation settings.

View Article: PubMed Central - HTML - PubMed

Affiliation: Teagasc, Moorepark Research Centre, Fermoy, Co Cork, Ireland. davidgleeson@eircom.net.

ABSTRACT
: Friesian-type dairy cows were milked with different machine settings to determine the effect of these settings on teat tissue reaction and on milking characteristics. Three teat-cup liner designs were used with varying upper barrel dimensions (wide-bore WB = 31.6 mm; narrow-bore NB = 21.0 mm; narrow-bore NB1 = 25.0 mm). These liners were tested with alternate and simultaneous pulsation patterns, pulsator ratios (60:40 and 67:33) and three system vacuum levels (40, 44 and 50 kPa). Teat tissue was measured using ultrasonography, before milking and directly after milking. The measurements recorded were teat canal length (TCL), teat diameter (TD), cistern diameter (CD) and teat wall thickness (TWT).Teat tissue changes were similar with a system vacuum level of either 50 kPa (mid-level) or 40 kPa (low-level). Widening the liner upper barrel bore dimension from 21.0 mm (P < 0.01) or 25.0 mm (P < 0.001) to 31.6 mm increased the magnitude of changes in TD and TWT after machine milking. Milk yield per cow was significantly (P < 0.05) higher and cluster-on time was reduced (P < 0.01) with the WB cluster as compared to the NB1 cluster. Minimum changes in teat tissue parameters were achieved with system vacuum level of 40 kPa and 50 kPa using NB and WB clusters, respectively. Similar changes in teat tissue and milk yield per cow were observed with alternate and simultaneous pulsation patterns. Widening pulsator ratio from 60:40 to 67:33 did not have negative effects on changes in teat tissue and had a positive effect on milk yield and milking time. Milk liner design had a bigger effect on teat tissue changes and milking characteristics than pulsation settings.

No MeSH data available.


Teat placed in a condom with the probe in vertical position against the teat wall.
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Related In: Results  -  Collection


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Figure 1: Teat placed in a condom with the probe in vertical position against the teat wall.

Mentions: An Aloka 500 v-ultrasound scanner with a 7 MHz linear probe was used to measure changes in teat tissue on cow's teats. A plastic ring at the opening supported a Femidom-condom; this allowed it to be held in place with one hand, filled with warm water and placed around the cow's teat (Figure 1). A film of lubricating gel was placed on the probe head to improve contact with the condom. The probe was manipulated until a clear image of the teat appeared on the screen. When the picture was obtained, the image was frozen on screen. Images of teats were stored on videocassette and these were subsequently measured on screen. A purpose-designed software program was used to automatically record to file the distance between two points, which were marked using a ball mouse.


Effect of liner design, pulsator setting, and vacuum level on bovine teat tissue changes and milking characteristics as measured by ultrasonography.

Gleeson DE, O'Callaghan EJ, Rath MV - Ir Vet J (2004)

Teat placed in a condom with the probe in vertical position against the teat wall.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3113817&req=5

Figure 1: Teat placed in a condom with the probe in vertical position against the teat wall.
Mentions: An Aloka 500 v-ultrasound scanner with a 7 MHz linear probe was used to measure changes in teat tissue on cow's teats. A plastic ring at the opening supported a Femidom-condom; this allowed it to be held in place with one hand, filled with warm water and placed around the cow's teat (Figure 1). A film of lubricating gel was placed on the probe head to improve contact with the condom. The probe was manipulated until a clear image of the teat appeared on the screen. When the picture was obtained, the image was frozen on screen. Images of teats were stored on videocassette and these were subsequently measured on screen. A purpose-designed software program was used to automatically record to file the distance between two points, which were marked using a ball mouse.

Bottom Line: Milk yield per cow was significantly (P < 0.05) higher and cluster-on time was reduced (P < 0.01) with the WB cluster as compared to the NB1 cluster.Widening pulsator ratio from 60:40 to 67:33 did not have negative effects on changes in teat tissue and had a positive effect on milk yield and milking time.Milk liner design had a bigger effect on teat tissue changes and milking characteristics than pulsation settings.

View Article: PubMed Central - HTML - PubMed

Affiliation: Teagasc, Moorepark Research Centre, Fermoy, Co Cork, Ireland. davidgleeson@eircom.net.

ABSTRACT
: Friesian-type dairy cows were milked with different machine settings to determine the effect of these settings on teat tissue reaction and on milking characteristics. Three teat-cup liner designs were used with varying upper barrel dimensions (wide-bore WB = 31.6 mm; narrow-bore NB = 21.0 mm; narrow-bore NB1 = 25.0 mm). These liners were tested with alternate and simultaneous pulsation patterns, pulsator ratios (60:40 and 67:33) and three system vacuum levels (40, 44 and 50 kPa). Teat tissue was measured using ultrasonography, before milking and directly after milking. The measurements recorded were teat canal length (TCL), teat diameter (TD), cistern diameter (CD) and teat wall thickness (TWT).Teat tissue changes were similar with a system vacuum level of either 50 kPa (mid-level) or 40 kPa (low-level). Widening the liner upper barrel bore dimension from 21.0 mm (P < 0.01) or 25.0 mm (P < 0.001) to 31.6 mm increased the magnitude of changes in TD and TWT after machine milking. Milk yield per cow was significantly (P < 0.05) higher and cluster-on time was reduced (P < 0.01) with the WB cluster as compared to the NB1 cluster. Minimum changes in teat tissue parameters were achieved with system vacuum level of 40 kPa and 50 kPa using NB and WB clusters, respectively. Similar changes in teat tissue and milk yield per cow were observed with alternate and simultaneous pulsation patterns. Widening pulsator ratio from 60:40 to 67:33 did not have negative effects on changes in teat tissue and had a positive effect on milk yield and milking time. Milk liner design had a bigger effect on teat tissue changes and milking characteristics than pulsation settings.

No MeSH data available.