Effect of modified dry period lengths and bovine somatotropin on yield and composition of milk from dairy cows

E. L. Annen, Robert J Collier, M. A. McGuire, J. L. Vicini, J. M. Ballam, M. J. Lormore

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Dry periods of 40 to 60 d have been an industry standard because dry periods <40 d have resulted in reduced milk yields in the subsequent lactation by 10 to 30%. However, recent research has demonstrated no production losses for cows given a 30-d dry period. The current study evaluated milk production effects of shortened or omitted dry periods for cows at mature-equivalent production >12,000 kg of milk and treated with bovine somatotropin (bST). The study used 2 commercial dairies and one university dairy and included 4 treatments. Five multiparous and 5 primiparous cows from each farm were assigned to each treatment: 1) 60-d dry period, label use of bST (60DD); 2) 30-d dry period, label use of bST (30DD); 3) continuous milking, label use of bST (CMLST); and 4) continuous milking with continuous use of bST (CMCST). Per label, bST use started at 57 to 70 d in milk and ended 14 d before drying (60DD and 30DD) or expected calving date (CMLST). In primiparous cows, average milk yields during the first 17 wk of lactation were reduced for cows on treatments 30DD, CMLST, and CMCST vs. the 60DD treatment. (38.3, 35.1, and 37.5 vs. 44.1 ± 1.3 kg/d, respectively). For multiparous cows, respective milk yields did not differ (46.6, 43.4, 46.5, and 47.7 ± 2.1 kg/d). Shortened or omitted dry periods may impede mammary growth in primiparous cows, resulting in reduced milk yield in the subsequent lactation. In contrast, a shortened or omitted dry period with either bST protocol did not alter production in multiparous cows treated with bST. Quality aspects of prepartum milk and colostrum require additional characterization. For multiparous cows, milk income generated for short dry periods or for continuous milking might increase their profitability. At 17 wk of the subsequent lactation, estimates of the cumulative net margins of multiparous cows on the 30DD treatment and continuous milking treatments exceeded those of cows on the 60DD treatment by $40 to $60 per cow.

Original languageEnglish (US)
Pages (from-to)3746-3761
Number of pages16
JournalJournal of Dairy Science
Volume87
Issue number11
StatePublished - Nov 2004

Fingerprint

dry period (lactation)
milk composition
somatotropin
milk yield
Milk
dairy cows
milking
cows
milk
Lactation
lactation
dairies
Colostrum
bovine growth hormone
colostrum
profitability
breasts
calving
Industry
income

Keywords

  • Bovine somatotropin
  • Continuous lactation
  • Shortened dry period

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)
  • Food Science

Cite this

Annen, E. L., Collier, R. J., McGuire, M. A., Vicini, J. L., Ballam, J. M., & Lormore, M. J. (2004). Effect of modified dry period lengths and bovine somatotropin on yield and composition of milk from dairy cows. Journal of Dairy Science, 87(11), 3746-3761.

Effect of modified dry period lengths and bovine somatotropin on yield and composition of milk from dairy cows. / Annen, E. L.; Collier, Robert J; McGuire, M. A.; Vicini, J. L.; Ballam, J. M.; Lormore, M. J.

In: Journal of Dairy Science, Vol. 87, No. 11, 11.2004, p. 3746-3761.

Research output: Contribution to journalArticle

Annen, EL, Collier, RJ, McGuire, MA, Vicini, JL, Ballam, JM & Lormore, MJ 2004, 'Effect of modified dry period lengths and bovine somatotropin on yield and composition of milk from dairy cows', Journal of Dairy Science, vol. 87, no. 11, pp. 3746-3761.
Annen, E. L. ; Collier, Robert J ; McGuire, M. A. ; Vicini, J. L. ; Ballam, J. M. ; Lormore, M. J. / Effect of modified dry period lengths and bovine somatotropin on yield and composition of milk from dairy cows. In: Journal of Dairy Science. 2004 ; Vol. 87, No. 11. pp. 3746-3761.
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