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Article| Volume 80, ISSUE 5, P838-844, May 1997

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Composition of Colostrum from Dairy Heifers Exposed to High Air Temperatures During Late Pregnancy and the Early Postpartum Period1

Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(97)76005-3
Composition of Colostrum from Dairy Heifers Exposed to High Air Temperatures During Late Pregnancy and the Early Postpartum Period1
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      Abstract

      This study examined the effects of heat stress on composition of colostrum from primiparous cows during late pregnancy and the early postpartum period. Two groups of 6 Holstein heifers were utilized. During the last 3 wk of pregnancy and during the first 36 h after calving, one group was exposed to thermal comfort (temperature-humidity index = 65); the other group was exposed to high air temperatures (temperature-humidity index = 82 from 0900 to 2000 h and temperature-humidity index = 76 from 2100 to 0800 h). Heifers under heat stress had higher rectal temperatures and respiratory rates; lower plasma tri-iodothyronine and glucose; higher plasma nonesterified fatty acids and β-hydroxybutyrate; lower intakes of dry matter, net energy for lactation, and crude protein; higher water intakes; and lower body condition scores. The decline of plasma immunoglobulins (Ig) over the final 2 wk of pregnancy was less pronounced for heifers under heat stress. For the first four milkings, colostrum of cows exposed to high air temperatures had lower mean concentrations of IgG and IgA; lower mean percentages of total protein, casein, lactalbumin, fat, and lactose; lower contents (grams per liter) of short- and medium-chain fatty acids; lower energy; lower titratable acidity; and higher pH. Thus, high air temperatures during late pregnancy and the early postpartum period markedly affected the composition of colostrum from primiparous dairy cows.

      Key words

      Abbreviation Key:

      FA (fatty acid), HAT (high air temperatures), TC (thermal comfort)

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      Article info

      Publication history

      Accepted: August 8, 1996
      Received: March 18, 1996

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(97)76005-3

      Copyright

      © 1997 American Dairy Science Association. Published by Elsevier Inc.

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