Dietary replacement of soybean meal with heat-treated soybean meal or high-protein corn distillers grains on nutrient digestibility and milk composition in mid-lactation cows.

Autor:	Chesini RG; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Takiya CS; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Dias MSS; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Silva TBP; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Nunes AT; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Grigoletto NTS; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., da Silva GG; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Vittorazzi PC Jr; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900., Rennó LN; Department of Animal Science, Federal University of Viçosa, Viçosa, Brazil, 36570-900., Rennó FP; Department of Animal Production and Animal Nutrition, University of São Paulo, Pirassununga, Brazil, 13635-900. Electronic address: francisco.renno@usp.br.
Jazyk:	angličtina
Zdroj:	Journal of dairy science [J Dairy Sci] 2023 Jan; Vol. 106 (1), pp. 233-244. Date of Electronic Publication: 2022 Nov 01.
DOI:	10.3168/jds.2022-21904
Abstrakt:	Lactation diets dependent on rumen undegradable protein (RUP) sources derived from soybean meal (SBM) products are generally high in Lys and poor in Met. We conducted an experiment to evaluate the effects of increasing dietary RUP and altering digestible AA supply by inclusion of heat-treated soybean meal (HTSBM) or high-protein corn dried distillers grains with soluble (DDGS) on performance in mid-lactation dairy cows. Twenty-four Holstein cows (200 ± 40 d in milk and 30.0 ± 3.92 kg/d of milk yield) blocked according to parity, milk yield, and days in milk were used in a 3 × 3 Latin square design experiment with 21-d periods. Treatments were (1) control (CON), a diet with 6.0% RUP containing 15.9% SBM as the main protein source; (2) HTSBM, a diet with 6.7% RUP containing 4.4% HTSBM partially replacing SBM; and (3) high-protein DDGS (FP; FlexyPro, SJC Bioenergia), a diet with 6.9% RUP containing 5.34% FP partially replacing SBM and ground corn. Diets had similar crude protein (16.9%) and net energy of lactation. Data were submitted to ANOVA using the mixed procedure of SAS software (SAS Institute Inc.). Treatment differences were evaluated using orthogonal contrasts: (1) increasing RUP (SBM vs. HTSBM + FP) and (2) altering digestible AA supply (HTSBM vs. FP). Cows fed HTSBM and FP had greater intake (values in parentheses represent treatment means of CON, HTSBM, and FP, respectively) of neutral detergent fiber (7.14, 7.35, and 7.69 kg/d), crude protein (4.27, 4.37, and 4.51 kg/d), and ether extract (0.942, 0.968, and 1.04 kg/d) compared with cows fed CON. Feeding FP resulted in greater intake of neutral detergent fiber and ether extract compared with HTSBM. Cows fed HTSBM and FP had lower sorting index for feed particles <4 mm than cows fed CON (1.029, 1.008, and 1.022). Feeding FP resulted in greater intake of feed particles <4 mm compared with HTSBM. Treatments containing HTSBM or FP tended to decrease organic matter digestibility (72.4, 71.2, and 71.1%), but no other effects were detected in digestibility of neutral detergent fiber, crude protein, or ether extract. No evidence for differences among treatments was detected in excretion of purine derivatives in milk and urine. Milk yield was greater in cows fed HTSBM or FP than in cows fed CON (28.0, 28.9, and 28.8 kg/d, respectively). Cows fed HTSBM or FP tended to have greater energy-corrected milk and protein yield compared with those fed CON. Milk protein concentration was greater in DDGS cows than those in the HTSBM group (3.45 and 3.40%, respectively). No differences were detected in milk fat yield and concentration, milk urea nitrogen, feed efficiency, or serum concentrations of urea and glucose. Overall, increasing dietary RUP by feeding HTSBM or FP improved intake of nutrients and milk yield without affecting feed efficiency. Altering digestible AA supply while maintaining similar dietary RUP had negligible effects on performance of cows. (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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