Journal of Dairy Science, ( ISI ), Volume (90), No (12), Year (2007-2) , Pages (5531-5541)

Title : Effects of Short Dry Periods on Performance and Metabolic Status ( Effects of Short Dry Periods on Performance and Metabolic Status in Holstein Dairy Cows )

Authors: A. Pezeshki , Jalil Mehrzad , G. R. Ghorbani , H. R. Rahmani , R. J. Collier , C. Burvenich ,

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Abstract

To evaluate effects of different dry period lengths on milk yield, milk composition, and energy balance of dairy cows, 122 multiparous and primiparous Holstein dairy cows were used in a completely randomized experimental design with 56-, 42-, and 35-d dry period lengths. Actual dry period lengths for respective treatments (TRT) were 56 5.1 d, 42 2.1 d, and 35 2.7 d. Overall, cows in the 42- and 56-d TRT gained more body condition than those in 35-d TRT during the dry period; however, postpartum body condition score did not change substantially among the TRT. Although from 3 to 210 DIM, differences were not detected in the milk yield of multiparous cows between the 35- and 56- d TRT, primiparous cows in the 35-d TRT produced less milk than those in 56-d TRT. In primiparous cows, the milk production at wk 9, 10, and 11 of lactation was lower in the 35-d compared with the 56-d TRT. Primiparous cows in the 35-d compared with the 56-d TRT produced less milk protein. In the 35-d TRT, serum triglyceride concentration was greater in primiparous cows than in multiparous cows during the peripartum period. Among primiparous cows, those in the 56-d TRT had greater concentrations of nonesterified fatty acids than those in the 35-d TRT during the peripartum period. No significant differences were observed in concentrations of serum glucose, insulin, and insulin-like growth factor-I during early lactation among TRT. There was also no difference among TRT for incidence of metabolic disorders. Thus, this study indicates that shortening the dry period to 35 d may be beneficial in multiparous and overconditioned cows, but not in primiparous cows.

Keywords

, dry period, metabolic status, performance
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@article{paperid:102680,
author = {A. Pezeshki and Mehrzad, Jalil and G. R. Ghorbani and H. R. Rahmani and R. J. Collier and C. Burvenich},
title = {Effects of Short Dry Periods on Performance and Metabolic Status},
journal = {Journal of Dairy Science},
year = {2007},
volume = {90},
number = {12},
month = {February},
issn = {0022-0302},
pages = {5531--5541},
numpages = {10},
keywords = {dry period; metabolic status; performance},
}

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%0 Journal Article
%T Effects of Short Dry Periods on Performance and Metabolic Status
%A A. Pezeshki
%A Mehrzad, Jalil
%A G. R. Ghorbani
%A H. R. Rahmani
%A R. J. Collier
%A C. Burvenich
%J Journal of Dairy Science
%@ 0022-0302
%D 2007

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