Physiological sresponses in thermal stressed Jersey cows subjected to different management strategie

Z. O. Keister, K. D. Moss, H. M. Zhang, Trent Teegerstrom, R. A. Edling, Robert J Collier, R. L. Ax

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The effects of cooling and recombinant bovine somatotropin (rbST) on milk yield, reproductive performance, and health of Jersey cattle during summer thermal stress were measured for 2 yr. Cows were assigned to one of two groups based upon days in milk (DIM), parity, and genetic index. Year 1 and year 2 control cows (n = 143, n = 183, respectively) were housed in a pen with only shades. Cooled treatment cows each year (n = 142, n = 180) were housed with a spray and fan system for evaporative cooling. Cows were assigned at various days postpartum, not before d 63, coincident with commencement of rbST injections. One half of cows in each group received rbST on d 63 postpartum. Cows were assigned to the shade trial ranging from d 63 to 190. Cooled versus noncooled DIM were similar at the start of the trial. Trials began on July 1, 1999, and July 1, 2000, and concluded on September 30, 1999, and September 25, 2000. The ANOVA of daily milk weight data was conducted utilizing a 2 x 2 factorial design with cooling and rbST treatments as main effects. Cooling in combination with rbST increased milk yield compared with no cooling and no rbST for 1999 and 2000 (25.5 versus 21.8 kg/ d, and 23.7 versus 20.5 kg/d, respectively). In general, cooling improved health and reproductive performance.

Original languageEnglish (US)
Pages (from-to)3217-3224
Number of pages8
JournalJournal of Dairy Science
Volume85
Issue number12
StatePublished - Dec 2002

Fingerprint

Jersey
somatotropin
Growth Hormone
cooling
Hot Temperature
Milk
heat
cows
Reproductive Health
milk
Postpartum Period
milk yield
reproductive performance
shade
thermal stress
fans (equipment)
parity (reproduction)
Parity
bovine growth hormone
Analysis of Variance

Keywords

  • Bovine somatotropin
  • Cooling
  • Jersey
  • Thermal stress

ASJC Scopus subject areas

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

Cite this

Physiological sresponses in thermal stressed Jersey cows subjected to different management strategie. / Keister, Z. O.; Moss, K. D.; Zhang, H. M.; Teegerstrom, Trent; Edling, R. A.; Collier, Robert J; Ax, R. L.

In: Journal of Dairy Science, Vol. 85, No. 12, 12.2002, p. 3217-3224.

Research output: Contribution to journalArticle

Keister, Z. O. ; Moss, K. D. ; Zhang, H. M. ; Teegerstrom, Trent ; Edling, R. A. ; Collier, Robert J ; Ax, R. L. / Physiological sresponses in thermal stressed Jersey cows subjected to different management strategie. In: Journal of Dairy Science. 2002 ; Vol. 85, No. 12. pp. 3217-3224.
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