Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system

Research output: Contribution to journalJournal articlepeer-review

Standard

Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system. / Pettersson, Gunnar; Svvenersten-Sjaunja, Kerstin; Knight, Christopher Harold.

In: Journal of Dairy Research, Vol. 78, No. 3, 2011, p. 379-384.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Pettersson, G, Svvenersten-Sjaunja, K & Knight, CH 2011, 'Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system', Journal of Dairy Research, vol. 78, no. 3, pp. 379-384. https://doi.org/10.1017/S0022029911000471

APA

Pettersson, G., Svvenersten-Sjaunja, K., & Knight, C. H. (2011). Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system. Journal of Dairy Research, 78(3), 379-384. https://doi.org/10.1017/S0022029911000471

Vancouver

Pettersson G, Svvenersten-Sjaunja K, Knight CH. Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system. Journal of Dairy Research. 2011;78(3):379-384. https://doi.org/10.1017/S0022029911000471

Author

Pettersson, Gunnar ; Svvenersten-Sjaunja, Kerstin ; Knight, Christopher Harold. / Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system. In: Journal of Dairy Research. 2011 ; Vol. 78, No. 3. pp. 379-384.

Bibtex

@article{d04400ddf226447f8881660c639f8cbf,
title = "Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system",
abstract = "A large dataset comprising output from an automatic milking (AM) system between 1999 and 2006 was examined and a total of 172 cow lactation curves and 68 heifer lactation curves were identified for further analysis. Relationships between milking frequency at different stages of lactation and lactation persistency and total lactation yield were determined. Cows had higher peak and total milk yields than heifers, but heifers had higher persistency (defined as the rate of decline in milk yield between days 100 and 300 post calving). Milking frequency did not differ significantly between cows and heifers in early lactation, but thereafter decreased significantly more in cows than in heifers. The effect of milking frequency on yield characteristics was analysed by comparing the highest and lowest quartiles for milking frequency. High milking frequency in early lactation was consistently associated with increased peak yield. High milking frequency averaged across the whole lactation was associated with increased peak yield in both cows and heifers, and with improved lactation persistency in cows only. This resulted in total lactation yield that was 21% greater in the high quartile cows compared with the low.",
keywords = "Former LIFE faculty, Dairy cattle, automatic milking, milking frequency, lactation persistency",
author = "Gunnar Pettersson and Kerstin Svvenersten-Sjaunja and Knight, {Christopher Harold}",
year = "2011",
doi = "10.1017/S0022029911000471",
language = "English",
volume = "78",
pages = "379--384",
journal = "Journal of Dairy Research",
issn = "0022-0299",
publisher = "Cambridge University Press",
number = "3",

}

RIS

TY - JOUR

T1 - Relationships between milking frequency, lactation persistency and milk yield in Sweish Red heifers and cows milked in a voluntary attendance automatic milking system

AU - Pettersson, Gunnar

AU - Svvenersten-Sjaunja, Kerstin

AU - Knight, Christopher Harold

PY - 2011

Y1 - 2011

N2 - A large dataset comprising output from an automatic milking (AM) system between 1999 and 2006 was examined and a total of 172 cow lactation curves and 68 heifer lactation curves were identified for further analysis. Relationships between milking frequency at different stages of lactation and lactation persistency and total lactation yield were determined. Cows had higher peak and total milk yields than heifers, but heifers had higher persistency (defined as the rate of decline in milk yield between days 100 and 300 post calving). Milking frequency did not differ significantly between cows and heifers in early lactation, but thereafter decreased significantly more in cows than in heifers. The effect of milking frequency on yield characteristics was analysed by comparing the highest and lowest quartiles for milking frequency. High milking frequency in early lactation was consistently associated with increased peak yield. High milking frequency averaged across the whole lactation was associated with increased peak yield in both cows and heifers, and with improved lactation persistency in cows only. This resulted in total lactation yield that was 21% greater in the high quartile cows compared with the low.

AB - A large dataset comprising output from an automatic milking (AM) system between 1999 and 2006 was examined and a total of 172 cow lactation curves and 68 heifer lactation curves were identified for further analysis. Relationships between milking frequency at different stages of lactation and lactation persistency and total lactation yield were determined. Cows had higher peak and total milk yields than heifers, but heifers had higher persistency (defined as the rate of decline in milk yield between days 100 and 300 post calving). Milking frequency did not differ significantly between cows and heifers in early lactation, but thereafter decreased significantly more in cows than in heifers. The effect of milking frequency on yield characteristics was analysed by comparing the highest and lowest quartiles for milking frequency. High milking frequency in early lactation was consistently associated with increased peak yield. High milking frequency averaged across the whole lactation was associated with increased peak yield in both cows and heifers, and with improved lactation persistency in cows only. This resulted in total lactation yield that was 21% greater in the high quartile cows compared with the low.

KW - Former LIFE faculty

KW - Dairy cattle

KW - automatic milking

KW - milking frequency

KW - lactation persistency

U2 - 10.1017/S0022029911000471

DO - 10.1017/S0022029911000471

M3 - Journal article

C2 - 21774865

VL - 78

SP - 379

EP - 384

JO - Journal of Dairy Research

JF - Journal of Dairy Research

SN - 0022-0299

IS - 3

ER -

ID: 40481307