Dried distiller´s grains plus solubles supplementation improves low-quality tropical grass utilization on beef steers

Hernández, Olegario; López, Agustín; García, Elisa Mariana; Nazareno, Mónica Azucena; Arroquy, José Ignacio

doi:10.1590/0103-8478cr20201127

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

animal production • Cienc. Rural 52 (6) • 2022 • https://doi.org/10.1590/0103-8478cr20201127 copy

Dried distiller´s grains plus solubles supplementation improves low-quality tropical grass utilization on beef steers

Suplementação de grãos de destilação secos com solúveis melhora a utilização de grama tropical de baixa qualidade para novilhos de corte

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

This study was designed to evaluate the effect of corn dried distiller´s grains (DDGS) supplementation on feed intake, total tract digestibility, and ruminal fermentation of beef steers fed low-quality Guinea grass (Megathyrsus maximus, cv. Gatton panic). Twelve Braford crossbred steers were housed in individual pens (n = 4 steers/treatment), provided with three levels of DDGS supplement: 0%, 0.6%, or 1.2% BW. Steers were blocked by live weight and randomly assigned to treatments within the block. Corn DDGS supplementation increased total OM intake (21.55, 40.23, and 56.69 g/kg BW^0.75) and tract OM digestibility (46.33, 49.03, and 72.39 % DM). Total tract digestible OM, CP, NDF and EE intake also increase in response to DDGS supplementation. Forage OM intake decreased when supplementation level reached 1.2 % BW. Also, ruminal pH decreased with DDGS supplementation level (6.88, 6.47, and 6.27). No differences were observed in total volatile fatty acids (VFA) concentration; however, the molar proportion of acetate decreased (77.98, 73.90, and 67.29 % Total VFA) as well as acetate: propionate ratio (4.38, 3.48, and 2.74). On the contrary, propionate proportions increased (18.32, 21.86, and 24.81 % Total VFA). Levels of ammonia and lactate were within suggested values for optimal fermentation and bacterial growth. Low-quality grass supplementation with corn DDGS increased total OM intake and digestibility. Also, DDGS inclusion favorably altered volatile fatty acids profile by reducing the acetate to propionate ratio regarding forage-only diets.

Key words:
distiller´s grains plus solubles; forage; beef cattle; intake; supplementation

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] E-mail: hernandez.olegario@inta.gob.ar. ^*Corresponding author

Item	Hay^*	DDGS
Dry matter (%)	93.00	90.00
Organic matter (% DM)	87.84	97.36
Crude protein (% DM)	7.00	25.80
Neutral detergent fiber (% DM)	74.50	59.00
Acid detergent fiber (% DM)	45.00	19.10
Ether extract (% DM)	1.50	6.50
Acid detergent insoluble ash (% DM)	3.08	0.61

	-------------------------Treatments-------------------			SEM	---------------P-value-------------
Item	0DDGS	0.6DDGS	1.2DDGS		L	Q
TOMI, g/kg BW^0.75	21.55	40.23	56.69	2.77	<0.01	0.75
FOMI, g/kg BW^0.75	21.55	18.72	12.78	2.02	0.02	0.55
CPI, g/kg BW^0.75	1.51	8.12	15.47	0.58	<0.01	0.62
NDFI, g/kg BW^0.75	16.49	39.26	66.54	3.03	<0.01	0.56
EEI, g/kg BW^0.75	0.10	1.66	3.32	0.09	<0.01	0.42
TTDOMI, g/kg BW^0.75	12.61	27.27	48.83	3.35	<0.01	0.40
TTDCPI, g/kg BW^0.75	0.91	4.61	10.51	1.09	<0.01	0.44
TTDNDFI, g/kg BW^0.75	6.54	15.64	26.86	3.08	<0.01	0.77
TTDEEI, g/kg BW^0.75	0.05	1.48	2.92	0.05	<0.01	0.87
TTOMD, %	40.82	50.60	70.17	5.82	0.01	0.54
TTCPD, %	39.49	51.67	69.70	7.99	0.04	0.77
TTNDFD, %	27.56	40.62	57.18	7.39	0.03	0.85
TTEED, %	53.45	89.12	87.99	5.21	<0.01	0.03

	----------------------Treatments-------------------			SEM	---------------------------P-value--------------------------
Item	0DDGS	0.6DDGS	1.2DDGS		T	H	T × H	L	Q
pH	6.88	6.47	6.27	0.09	<0.01	<0.01	0.07	<0.01	0.26
N-NH₃ (mM)	11.61	7.13	9.31	1.76	0.14	<0.01	0.74	0.30	0.09
Lactate (mM)	0.71	2.86	2.15	1.03	0.34	0.08	0.55	0.33	0.27
Total VFA (mM)	115.22	129.28	114.60	5.63	0.14	0.22	0.92	0.94	0.05
-------------------------------------------------------Molar proportion (moles/100 moles of total VFA)---------------------------------------------------
Acetate	77.98	73.90	67.29	0.90	<0.01	0.05	0.10	<0.01	0.26
Propionate	18.32	21.86	24.81	0.83	<0.01	0.39	0.20	<0.001	0.77
Butyrate	3.02	3.69	6.14	0.28	<0.01	<0.01	0.03	<0.001	<0.01
Isovalerate	0.41	0.27	0.88	0.08	<0.01	<0.01	0.26	<0.001	<0.01
Valerate	0.27	0.28	0.88	0.05	<0.01	0.23	0.55	<0.01	<0.01
A:P ¹⁾	4.38	3.48	2.74	0.17	<0.01	0.44	0.15	<0.01	0.69