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Overmilking causes deterioration in teat-end condition of dairy cows in late lactation

Published online by Cambridge University Press:  28 June 2013

J Paul Edwards ,
Bernadette O'Brien ,
Nicolas Lopez-Villalobos  and
Jenny G Jago
J Paul Edwards*
Affiliation:
DairyNZ, Private Bag 3221, Hamilton 3240, New Zealand Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
Bernadette O'Brien
Affiliation:
Teagasc Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland
Nicolas Lopez-Villalobos
Affiliation:
Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
Jenny G Jago
Affiliation:
DairyNZ, Private Bag 3221, Hamilton 3240, New Zealand
*
*For correspondence; e-mail: Paul.Edwards@dairynz.co.nz
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Abstract

The objective of the study was to determine the effect of varying degrees of overmilking on teat-end hyperkeratosis, milk production variables and indicators of udder health during late lactation. This was examined by assessing the effect of four end-of-milking criteria on 181 spring-calving, mixed-age Holstein-Friesian cows, at an average 217±24 d in milk, over a six-week period. The four treatments were: remove cluster once milk flow rate fell to 0·2 kg/min plus 5 s (Ovr0), plus 120 s (Ovr2), plus 300 s (Ovr5), and plus 540 s (Ovr9). Daily measurements included individual cow milk yield, milking duration, overmilking duration, maximum milk flow rate, milk flow rate at cluster removal and the number of cluster re-attachments. Individual cow bulk milk samples were collected weekly at AM and PM milkings to determine composition (fat, protein and lactose) and somatic cell count (SCC; AM only). Teat-end hyperkeratosis score was assessed at weeks 0, 3, 5 and 6. At week 6 mean teat-end hyperkeratosis score of the Ovr2 treatment was not greater than Ovr0, whilst Ovr5 was greater than Ovr2 and Ovr9 was greater than Ovr5 and Ovr2. Milk production, milking characteristics and SCC were not different between treatments, except milking duration and milk flow rate at cluster removal. However, higher teat-end hyperkeratosis scores may have a longer-term impact on indicators of udder health if teat-end condition reaches severe levels. Results indicate that to minimise changes in teat-end condition overmilking should be limited to 2 min, which has implications for milking management in large parlours not fitted with automatic cluster removers.

Keywords

Overmilkingteat-end hyperkeratosismilking management
Type
Research Article
Information
Journal of Dairy Research , Volume 80 , Issue 3 , August 2013 , pp. 344 - 348
Copyright
Copyright © Proprietors of Journal of Dairy Research 2013 

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