Effect of body condition change and health status during early lactation on performance and survival of Holstein cows.

Autor:	Manríquez D; Department of Animal Sciences, Colorado State University, Fort Collins 80521., Thatcher WW; Department of Animal Sciences, University of Florida, Gainesville 32611., Santos JEP; Department of Animal Sciences, University of Florida, Gainesville 32611., Chebel RC; College of Veterinary Medicine, University of Florida, Gainesville 32611., Galvão KN; College of Veterinary Medicine, University of Florida, Gainesville 32611., Schuenemann GM; Department of Veterinary Preventive Medicine, The Ohio State University, Columbus 43210., Bicalho RC; College of Veterinary Medicine, Cornell University, Ithaca, NY 14850., Gilbert RO; School of Veterinary Medicine, Ross University, St. Kitts, West Indies., Rodriguez-Zas S; Department of Animal Sciences, University of Illinois, Urbana-Champaign 61801., Seabury CM; College of Veterinary Medicine, Texas A&M University, College Station 77843., Rosa GJM; Department of Animal and Dairy Sciences, University of Wisconsin, Madison 53706., Pinedo P; Department of Animal Sciences, Colorado State University, Fort Collins 80521. Electronic address: pablo.pinedo@colostate.edu.
Jazyk:	angličtina
Zdroj:	Journal of dairy science [J Dairy Sci] 2021 Dec; Vol. 104 (12), pp. 12785-12799. Date of Electronic Publication: 2021 Sep 27.
DOI:	10.3168/jds.2020-20091
Abstrakt:	Body condition score (BCS) and disease records are commonly available in dairy operations. However, the effect of BCS changes (ΔBCS) considering specific health profiles has not been investigated extensively. The objective of this study was to assess the effects of different levels of ΔBCS on fertility, milk yield, and survival of Holstein cows diagnosed with reproductive disorders (REP; dystocia, twins, retained fetal membranes, metritis, and clinical endometritis), other health disorders (OTH; subclinical ketosis, left displaced abomasum, lameness, clinical mastitis, and respiratory disease), or with no disease events (HLT) within 40 days in milk (DIM). Data included lactation information from 11,733 cows calving between November 2012 and October 2014 in 16 herds across 4 geographical regions in the United States (Northeast, Midwest, Southwest, Southeast). Cows were evaluated for BCS at 5 ± 3 DIM (BCS5) and at 40 ± 3 DIM (BCS40) and the difference between BCS40 and BCS5 was classified as excessive loss of BCS (EL; ΔBCS ≤-0.75), moderate loss (ML; ΔBCS = -0.5 to -0.25), no change (NC; ΔBCS = 0), or gain of BCS (GN; ΔBCS ≥0.25). Multivariable logistic regression was used for assessing potential associations between the outcomes of interest and ΔBCS and health. The effect of the interaction term ΔBCS by health group was not statistically significant for any of the study outcomes. The odds of resumption of ovarian cyclicity (ROC), in GN, NC, and ML cows were 1.94 (95% CI: 1.57-2.40), 1.59 (1.28-1.97), and 1.27 (1.10-1.47) times greater than the odds of ROC in EL cows, respectively. The odds of pregnancy at 150 DIM (P150) in GN cows were 1.61 (1.20-2.17) times greater than the odds of P150 in EL cows. Cows with REP or OTH disorders had smaller odds of ROC compared with HLT cows [REP: OR = 0.65 (0.56-0.76) and OTH: OR = 0.79 (0.68-0.92)]. For pregnancy outcomes, REP cows had smaller odds of pregnancy at the first artificial insemination compared with HLT cows [0.70 (0.58-0.84)]. Similarly, REP cows had smaller odds of being diagnosed pregnant by 150 and 305 DIM compared with HLT cows [P150: 0.73 (0.59-0.87), P305: 0.58 (0.49-0.69)]. Overall, average daily milk within the first 90 DIM was greater in EL (39.5 ± 1.13 kg/d) and ML (38.9 ± 1.11 kg/d) cows than in NC (37.8 ± 1.12 kg/d) and GN (36.2 ± 1.12 kg/d) cows. On the other hand, average daily milk within the first 90 DIM was lower in REP (37.0 ± 1.11 kg/d) cows compared with OTH (38.7 ± 1.12 kg/d) and HLT cows (38.6 ± 1.11 kg/d). The magnitude of ΔBCS and the health status of early lactation cows should be considered when assessing subsequent cow performance and survival. (© 2021, The Authors. Published by Elsevier Inc. and Fass Inc. on behalf of the American Dairy Science Association®. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).)
Databáze:	MEDLINE
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