Effect of supplemental methionine on health and performance of receiving beef heifers.

Autor:	Grant MS; Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS 66506, USA., Speer HF; Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS 66506, USA., Luchini ND; Adisseo USA Inc., Alpharetta, GA 30022, USA., Blasi DA; Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS 66506, USA., Titgemeyer EC; Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS 66506, USA.
Jazyk:	angličtina
Zdroj:	Translational animal science [Transl Anim Sci] 2022 Aug 21; Vol. 6 (4), pp. txac113. Date of Electronic Publication: 2022 Aug 21 (Print Publication: 2022).
DOI:	10.1093/tas/txac113
Abstrakt:	Methionine supplementation can improve immune function in transition dairy cattle. Our objective was to determine if supplemental methionine could improve health and performance of newly received growing cattle. Crossbred heifers ( n = 384; 222 kg initial body weight; southeastern U.S. origin) were received in four truckloads (blocks) over 9 d. Heifers were weighed at arrival. The following day (d 0) cattle were vaccinated for viral and clostridial diseases, received 2.5 mg tulathromycin/kg body weight, and were stratified within the blocks by arrival body weight to 1 of 8 pens containing 12 heifers each. Within blocks, pens were assigned to 1 of 2 treatments: 0 (control) or 0.1725% Smartamine M to provide 0.1035% metabolizable methionine to the diet. Cattle were limit-fed at 2.2% of body weight daily (dry matter basis) on a diet containing 40% wet corn gluten feed, 34.5% dry-rolled corn, 10% corn silage, 7.5% supplement, 4% alfalfa hay, and 4% prairie hay. Pen weights were measured weekly to determine the feed offered the following week. Individual body weight and tail-vein blood samples were collected on d 0, 14, and 45. Plasma haptoglobin was measured to assess acute-phase protein response. Incidences of morbidity (1.6% for control, 2.6% for Smartamine M) and mortality (0.5% for both control and Smartamine M) were low. Between d 0 and 45, no differences were observed for average daily gain (1.24 vs. 1.27 kg/d; control vs. Smartamine M, P = 0.55) or gain:feed (0.107 vs. 0.110, P = 0.28), although dry matter intake was 1.3% greater ( P < 0.01) for control than Smartamine M due to differences in diet dry matter concentration. An interaction between treatment and linear effect of day was detected for plasma haptoglobin ( P < 0.05); over time, haptoglobin increased more for control (2.15, 2.28, and 2.95 mg/mL at 0, 14, and 45 d) than for Smartamine M (2.35, 2.37, and 2.58 mg/mL). Supplemental methionine may alleviate acute-phase protein responses in stressed receiving cattle. (© The Author(s) 2022. Published by Oxford University Press on behalf of the American Society of Animal Science.)
Databáze:	MEDLINE
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