Effects of milk replacer allowances and levels of starch in pelleted starter on nutrient digestibility, whole gastrointestinal tract fermentation, and pH around weaning.

Autor:	Yohe TT; Department of Animal Biosciences, University of Guelph, Guelph, Canada N1G 2W1., Dennis TS; Nurture Research Center, Provimi, Cargill Animal Nutrition, Lewisburg, OH 45338., Villot C; Lallemand Animal Nutrition, F-31702, Blagnac, France., Quigley JD; Nurture Research Center, Provimi, Cargill Animal Nutrition, Lewisburg, OH 45338., Hill TM; Nurture Research Center, Provimi, Cargill Animal Nutrition, Lewisburg, OH 45338., Suarez-Mena FX; Nurture Research Center, Provimi, Cargill Animal Nutrition, Lewisburg, OH 45338., Aragona KM; Nurture Research Center, Provimi, Cargill Animal Nutrition, Lewisburg, OH 45338., Pineda A; Department of Animal Biosciences, University of Guelph, Guelph, Canada N1G 2W1., Laarman AH; Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada T6G 2P5., Costa JHC; Department of Animal and Food Sciences, University of Kentucky, Lexington 40506., Steele MA; Department of Animal Biosciences, University of Guelph, Guelph, Canada N1G 2W1. Electronic address: masteele@uoguelph.ca.
Jazyk:	angličtina
Zdroj:	Journal of dairy science [J Dairy Sci] 2022 Aug; Vol. 105 (8), pp. 6710-6723. Date of Electronic Publication: 2022 Jun 16.
DOI:	10.3168/jds.2022-21982
Abstrakt:	The objectives of this study were to examine the effects of pelleted starter diets differing in starch and neutral detergent fiber (NDF) content when fed differing levels of milk replacer (MR) on nutrient digestibility, whole gastrointestinal tract fermentation, pH, and inflammatory markers in dairy calves around weaning. Calves were randomly assigned to 1 of 4 dietary treatments (n = 12 per treatment) in a 2 × 2 factorial design based on daily MR allowance and amount of starch in pelleted starter (SPS): 0.691 kg of MR per day [dry matter (DM) basis] with starter containing low or high starch (12.0% and 35.6% starch on DM basis, respectively), and 1.382 kg of MR per day (DM) with starter containing low or high starch. All calves were housed in individual pens with straw bedding until wk 5 when bedding was covered. Calves were fed MR twice daily (0700 and 1700 h) containing 24.5% crude protein (DM) and 19.8% fat (DM), and had access to pelleted starter (increased by 50 g/d if there were no refusals before weaning and then 200 g/d during and after weaning) and water starting on d 1. Calves arrived between 1 and 3 d of age and were enrolled into an 8-wk study, with calves undergoing step-down weaning during wk 7. Starting on d 35, an indwelling pH logger was inserted orally to monitor rumen pH until calves were dissected at the end of the study in wk 8. Higher SPS calves showed an increase in rumen pH magnitude (1.46 ± 0.07) compared with low SPS calves (1.16 ± 0.07), a decrease in rumen pH in wk 8 (high SPS: 5.37 ± 0.12; low SPS: 5.57 ± 0.12), and a decrease in haptoglobin in wk 8 (high SPS: 0.24 ± 0.06 g/L; low SPS: 0.49 ± 0.06 g/L). The majority of differences came from increased starter intake in general, which suggests that with completely pelleted starters the differences in starch and NDF do not elicit drastic changes in fermentation, subsequent end products, and any resulting inflammation in calves around weaning. (© 2022, 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 license (http://creativecommons.org/licenses/by/4.0/).)
Databáze:	MEDLINE
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