دورية أكاديمية
A randomized trial on the effects of heat abatement during the pre-weaning phase on growth and reproductive performance of heifers and health, reproductive and productive performances of cows.
| العنوان: | A randomized trial on the effects of heat abatement during the pre-weaning phase on growth and reproductive performance of heifers and health, reproductive and productive performances of cows. |
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| المؤلفون: | Montevecchio AB; Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610, United States., Chebel RC; Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610, United States; Department of Animal Sciences, Institute of Food and Agricultural Sciences, University of Florida, Gainesville 32610, United States. Electronic address: rcchebel@ufl.edu. |
| المصدر: | Preventive veterinary medicine [Prev Vet Med] 2024 Sep; Vol. 230, pp. 106259. Date of Electronic Publication: 2024 Jun 26. |
| نوع المنشور: | Journal Article; Randomized Controlled Trial, Veterinary |
| اللغة: | English |
| بيانات الدورية: | Publisher: Elsevier Scientific Publishing Country of Publication: Netherlands NLM ID: 8217463 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-1716 (Electronic) Linking ISSN: 01675877 NLM ISO Abbreviation: Prev Vet Med Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: Amsterdam : Elsevier Scientific Publishing Original Publication: Amsterdam, Netherlands : Elsevier, [1982- |
| مواضيع طبية MeSH: | Weaning* , Reproduction*/physiology, Animals ; Cattle/physiology ; Female ; Pregnancy ; Hot Temperature ; Lactation/physiology ; Housing, Animal ; Random Allocation ; Animal Husbandry/methods |
| مستخلص: | Evaluation of heat stress abatement for pre-weaned dairy calves is a rare endeavor. We aimed to assess the impacts of cooling the environment of pre-weaned calves through ceiling fans on their performance after weaning and during their first lactation. We randomly assigned female Holstein calves to one of two treatment at birth (day 0): individual frame-wire hutches in a non-cooled barn ("SH", n = 125) and individual frame-wire hutches in a barn equipped with ceiling fans ("SHF", n = 101). Calves were housed under the same barn, with treatments applied in three alternating sections. Ceiling fans (2.1 m in diameter) were positioned 4.1 m from the ground and 7.6 m apart (center-to-center). Shade cloths were used to separate the sections designated for the SH and SHF treatments. Post-weaning, heifers were commingled. We recorded body weight (BW) and average daily gain (ADG) at weaning, 5, 7, and 10 mo of age. Pregnancy to first artificial insemination (P/1AI), hazard of pregnancy, and the hazard of commencing the first lactation are reported. Body weight at first calving, P/1AI, hazard of pregnancy, and milk yield in the first lactation are reported. No differences in BW (5 mo: SH = 162.9 ± 1.6 kg vs. SHF = 162.3 ± 1.6 kg; 7 mo: SH = 200.8 ± 2.2 kg vs. SHF = 201.1 ± 2.3 kg; 10 mo: SH = 300.5 ± 2.6 kg vs. SHF = 300.0 ± 2.8 kg) and ADG (SH = 0.94 ± 0.02 kg/d, SHF = 0.94 ± 0.02 kg/d) from 5 to 10 mo of age were detected. Treatment did not affect P/1AI (SH = 53.5 %, SHF = 45.9 %) and hazard of pregnancy [SH = referent, SHF - adjusted hazard ratio (AHR) = 0.87 (95 % CI = 0.65, 1.18)], but heifers in the SHF treatment were less likely to initiate the first lactation (76.2 % vs. 86.4 %). Body weight at calving (SH = 612.4 ± 5.3 kg, SHF = 618.2 ± 5.9 kg) and milk yield (SH = 39.0 ± 0.48 kg/d, SHF = 38.3 ± 0.57 kg/d) were not different, but the SHF treatment resulted in lower P/1AI (38.4 % vs. 51.4 %) and hazard of pregnancy (AHR = 0.68, 95 % CI = 0.49, 0.93) and fewer cows starting their second lactation (57.4 % vs. 72.8 %). In our experiment, providing cooling through ceiling fans during the pre-weaning phase had a negative impact on the reproductive performance of Holstein cows during their first lactation. Competing Interests: Declaration of Competing Interest None of the authors have any conflict of interest to declare. (Copyright © 2024 Elsevier B.V. All rights reserved.) |
| فهرسة مساهمة: | Keywords: Fans; First lactation; Heat abatement; Heifer |
| تواريخ الأحداث: | Date Created: 20240704 Date Completed: 20240812 Latest Revision: 20240812 |
| رمز التحديث: | 20240813 |
| DOI: | 10.1016/j.prevetmed.2024.106259 |
| PMID: | 38964209 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1873-1716 |
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| DOI: | 10.1016/j.prevetmed.2024.106259 |