Forage intake and performance of heifers fed rice bran on Alexandergrass pasture

Negrini, M.; Rocha, M.G.; Pötter, L.; Severo, P.O.; Salvador, P.R.; Rosa, V.B.; Amaral Neto, L.G.; Vicente, J.M.

doi:10.1590/1678-4162-9701

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Animal Science and Technology and Inspection of Animal Products • Arq. Bras. Med. Vet. Zootec. 70 (05) • Sep-Oct 2018 • https://doi.org/10.1590/1678-4162-9701 copy

Forage intake and performance of heifers fed rice bran on Alexandergrass pasture

Ingestão de forragem e performance de bezerros alimentados com farelo de arroz integral em pasto de papuã

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The study was carried out to evaluate the forage intake and performance of beef heifers from 15 to 18 months of age, grazing on Alexandergrass (Urochloaplantaginea (Link) Hitch) fed rice bran (RB; 0, 0.5 and 1.0% body weight (BW)). The experiment consisted of a completely randomized design with repeated measurement arrangement. Rice bran increased the total dry matter (DM) intake, total crude protein intake and total digestible nutrients intake. Heifers that received 1.0% BW of RB reduced forage DM intake, increasing by 18% stocking rate (SR) and by 27% BW gain per area in comparison with the system exclusively on pasture. In the system in which the heifers were fed 0.5% BW of RB, SR and gain per area were similar to other systems. In this feeding system, we observed average daily gain 18% higher than when heifers were exclusively on pasture and gain similar to that observed when using 1.0% BW of RB. In Alexandergrass pasture it is recommended to supply 0.5% BW of RB for beef heifers from 15 to 18 months of age, to promote better productive responses compared to heifers exclusively on pasture and similar to those observed when supplying 1.0% BW of RB.

Keywords:
substitution coefficient; rotational stocking grazing method; chromium oxide; energetic supplement; Urochloaplantaginea(Link) Hitch

Universidade Federal de Minas Gerais, Escola de Veterinária Caixa Postal 567, 30123-970 Belo Horizonte MG - Brazil, Tel.: (55 31) 3409-2041, Tel.: (55 31) 3409-2042 - Belo Horizonte - MG - Brazil
E-mail: abmvz.artigo@gmail.com

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[1] *Autor para correspondência (corresponding author) E-mail: salvador.pauloroberto@gmail.com

Variables	Feeding systems¹			P*	P**	SD***
Variables	Alexandergrass	Al+0.5	Al+1.0
Post-grazing sward height ²	23.7	24.1	23.5	0.7200	0.9665	3.0
Average forage mass³	3985.2	3691.9	3974.9	0.4952	0.9476	803.9
Leaf blade mass³	855.9	851.7	976.3	0.1019	0.7291	196.8
Stem mass³	2009.6	1936.8	2042.2	0.8703	0.9935	505.0
Leaf:stem ratio	0.5	0.5	0.5	0.7129	0.7608	0.09
Forage allowance⁴	9.2	7.8	7.8	0.1946	0.9623	1.94
Leaf blade allowance⁴	2.1	1.9	2.0	0.6300	0.9859	0.36
In situDMdigestibility⁵	65.6	67.1	66.5	0.7272	0.1629	5.9
Neutral fiber detergent⁵	63.2^a	62.5^ab	60.0^b	0.0478	0.6254	2.78
Crude protein⁵	12.4^b	12.4^b	13.6^a	0.0934	0.9089	6.33
Total digestible nutrients⁵	62.2	62.6	62.0	0.9429	0.1527	5.5

Feeding systems¹	Grazings cycles		Average	P*	P**	SD***
Feeding systems¹	02/22- 03/10/15	03/26-04/19/15
	Dry matter intake of forage²
Alexandergrass	2.9	2.3	2.6ª	0.0189
Alexandergrass+0.5%RB	2.9	2.5	2.7ª		0.1065	0.39
Alexandergrass+1.0%RB	2.2	2.3	2.2^b
Average	2.7	2.4		0.0425
	Total dry matter intake²
Alexandergrass	2.9	2.3	2.6^b	0.0085
Alexandergrass+0.5%RB	3.4	3.0	3.2ª		0.1161	0.40
Alexandergrass+1.0%RB	3.0	3.2	3.1ª
Average	3.1	2.8		0.0527
	Crude protein intake of forage²
Alexandergrass	0.43	0.24	0.33	0.1806
Alexandergrass+0.5%RB	0.43	0.26	0.35		0.1017	0.09
Alexandergrass+1.0%RB	0.33	0.26	0.29
Average	0.39	0.25		<0.0001
	Total crude protein intake²
Alexandergrass	0.43	0.24	0.33^b	0.0162
Alexandergrass+0.5%RB	0.49	0.33	0.41ª		0.1246	0.09
Alexandergrass+1.0%RB	0.46	0.39	0.42ª
Average	0.46	0.32		<0.0001
	Total digestible nutrients intake ²
Alexandergrass	2.0	1.3	1.6^b	0.0259
Alexandergrass+0.5%RB	2.2	1.8	2.0^a		0.0563	0.35
Alexandergrass+1.0%RB	2.1	1.9	2.0^a
Average	2.1	1.7		0.0018
	Neutral detergent fiber intake²
Alexandergrass	1.8	1.5	1.7^ab	0.0711
Alexandergrass+0.5%RB	1.9	1.7	1.8^a		0.0606	0.20
Alexandergrass+1.0%RB	1.5	1.6	1.6^b
Average	1.7	1.6		0.1217

Parameters	Feeding systems¹			P^*	SD^**
Parameters	Alexandergrass	Al+0.5	Al+1.0
Average daily gain²	0.865^b	1.025^a	0.991^ab	0.0645	0.14
Body weight gain per area³	495^b	588^ab	629^a	0.0927	74.7
Stocking rate³	2462.1^b	2628.2^ab	2925.8^a	0.0347	358.0
Hip height gain⁴	4.7^b	6.2^a	7.0^a	0.0360	0.96
Final body condition score	3.8^a	3.8^a	3.9^a	0.6864	0.16
Final body weight⁵	341.2^b	348.7^ab	366.2^a	0.0707	22.5