JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 83 No. 6 1381-1386
© 2000 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Tekerli, M.
Right arrow Articles by Akcan, A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Tekerli, M.
Right arrow Articles by Akcan, A.

Factors Affecting the Shape of Lactation Curves of Holstein Cows from the Balikesir Province of Turkey

M. Tekerli 1, Z. Akinci 1, I. Dogan 1, and A. Akcan 1

1 Department of Zootechny, Faculty of Veterinary Medicine, Afyon Kocatepe University, Turkey

The shape of the lactation curve for 475 Turkish Holsteins was estimated by fitting a gamma function to daily milk yields from monthly recording of 754 lactations. Lactation curve traits that were analyzed included a scaling factor associated with yield at the beginning of lactation, the inclining and declining slopes before and after peak yield, DIM at peak yield, and peak and lactation yields. Persistency of lactation yield was measured from 1) the gamma function, 2) the coefficient of variation for monthly test-day yields, and 3) the ratio of lactation yield to peak yield. The log-transformed gamma function explained 71% of variation in daily yield. Effects of farm operation, calving year, calving season, parity, and service period were significant for the various lactation curve traits. Peak and lactation yields were higher for cows that calved in fall and winter, and persistency was higher for cows that calved in summer and fall. Peak and lactation yields were lower, but persistency was higher during first lactation. Repeatability estimates were moderate for peak (0.26) and lactation (0.34) yields and lower (0.06 to 0.20) for other lactation curve traits.

Key Words: lactation curve • persistency • milk yield • Turkey

Submitted on August 2, 1999
Accepted on January 14, 2000




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
M. Caccamo, R. F. Veerkamp, G. de Jong, M. H. Pool, R. Petriglieri, and G. Licitra
Variance Components for Test-Day Milk, Fat, and Protein Yield, and Somatic Cell Score for Analyzing Management Information
J Dairy Sci, August 1, 2008; 91(8): 3268 - 3276.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
J. R. Roche, D. P. Berry, and E. S. Kolver
Holstein-friesian strain and feed effects on milk production, body weight, and body condition score profiles in grazing dairy cows.
J Dairy Sci, September 1, 2006; 89(9): 3532 - 3543.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
A. M. Silvestre, F. Petim-Batista, and J. Colaco
The Accuracy of Seven Mathematical Functions in Modeling Dairy Cattle Lactation Curves Based on Test-Day Records From Varying Sample Schemes
J Dairy Sci, May 1, 2006; 89(5): 1813 - 1821.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
N. P. P. Macciotta, D. Vicario, and A. Cappio-Borlino
Detection of Different Shapes of Lactation Curve for Milk Yield in Dairy Cattle by Empirical Mathematical Models
J Dairy Sci, March 1, 2005; 88(3): 1178 - 1191.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2000 by the American Dairy Science Association ®.