Ruminal degradability of brown-midrib sorghum-sudangrass hybrids for cutting and grazing

Ferreira, Deborah Alves; Gonçalves, Lúcio Carlos; Rodrigues, José Avelino Santos

doi:10.5935/1806-6690.20180016

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Zootecnia • Rev. Ciênc. Agron. 49 (1) • Jan-Mar 2018 • https://doi.org/10.5935/1806-6690.20180016 copy

Ruminal degradability of brown-midrib sorghum-sudangrass hybrids for cutting and grazing¹ 1 Parte da Tese de Doutorado em Zootecnia da primeira autora, apresentada na Universidade Federal de Minas Gerais/UFMG

Degradabilidade ruminal de híbridos de sorgo sudão para corte e pastejo portadores de nervura marrom

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Greater ruminal degradability has been reported in mutant plants with brown midrib (bmr). The aim of this study was to evaluate the in situ degradability of dry matter (DM), neutral detergent fibre (NDF) and crude protein (CP) in the experimental sorghum-sudangrass bmr hybrids BR007 x Tx2784bmr and Tx635x Tx2785bmr, conventional experimental hybrids CMSxS206 x Tx2784 and Tx636 x Tx2785, and the control hybrid BRS801, harvested 51 days after planting. Three sheep with ruminal cannulae were used. The experimental design was of randomised complete blocks in subdivided lots. The mean values for DM and NDF disappearance were higher in the bmr hybrids after 6 h incubation. These plants had a higher rate of degradation (mean value of 6.93%/h) for fraction b of the DM compared to conventional plants (mean value of 5.73%/h), and greater effective DM degradability. The mean values for effective NDF degradability at passage rates of 2, 5 and 8%/h were 72.7% and 62.0%, 56.1% and 45.6%, and 47.1% and 37.3% for the bmr and conventional hybrids respectively. The experimental mutant hybrids showed higher values for effective CP degradability in relation to the remainder, however, the differences were more subtle in relation to those seen for DM and NDF. The results of the present work show the potential of using sorghum-sudangrass bmr hybrids in systems of ruminant production with high nutritional requirements.

Key words:
Forage; In situ; Ruminants; Sorghum bicolor; Sorghum sudanense

Period (h)	pH	N-NH₃ (mg/100mL)
- 30 min	6.76 ± 0.22	11.89 ± 1.91
1	6.50 ± 0.07	37.35 ± 1.53
2	6.38 ± 0.11	25.16 ± 3.89
3	6.68 ± 0.12	20.84 ± 5.27
5	6.49 ± 0.20	10.18 ± 4.64
7	6.59 ± 0.39	7.94 ± 4.73
9	6.52 ± 0.33	6.63 ± 3.68

Hybrid	DM (%)	% DM
Hybrid	DM (%)	CP	NDF	ADF	Lignin	TDN
BR007 x Tx2784bmr	7.69	18.2	54.0	33.3	3.39	61.28
Tx635 x Tx2785bmr	7.10	15.2	59.6	38.1	3.61	58.94
CMSxS206 x Tx2784	8.27	14.0	62.4	39.1	3.76	57.75
Tx636 x Tx2785	7.97	13.4	64.8	41.9	3.52	56.74
BRS 801	8.25	13.6	61.6	38.8	4.12	58.10

Hybrid^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	Period (h)
	0	6	12	24	48	96
BR007 x Tx2784bmr	36.44 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	56.21 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	68.84 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	83.44 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	92.18 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	95.14 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%
Tx635 x Tx2785bmr	27.93 ^bc	48.43 ^b	66.38 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	80.05 ^b	90.97 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%	93.75 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=3.0%
CMSxS206 x Tx2784	28.67 ^b	44.16 ^c	57.00 ^b	69.25 ^c	81.17 ^b	86.76 ^b
Tx636 x Tx2785	26.50 ^bc	41.23 ^c	55.35 ^b	71.60 ^c	81.35 ^b	85.63 ^b
BRS 801	24.60 ^c	40.80 ^c	56.66 ^b	71.63 ^c	83.13 ^b	88.82 ^b

	a (%)	b (%)	c (% / h)	ED 2% / h	ED 5% / h	ED 8% / h	R²
BR007 x Tx2784bmr	37.31	57.69	6.61	81.6	70.2	63.4	0.99
Tx635 x Tx2785bmr	25.14	68.15	7.24	78.4	65.4	57.5	0.99
CMSxS206 x Tx2784	30.21	56.63	4.99	70.6	58.5	52.0	0.99
Tx636 x Tx2785	20.96	64.28	6.36	70.0	57.2	49.8	0.99
BRS 801	21.88	66.36	5.85	71.4	57.8	50.0	0.99

Hybrid^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	Period (h)
	0	6	12	24	48	96
BR007 x Tx2784bmr	21.70 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	34.46 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	53.18 ^a	74.70 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	88.71 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	93.04 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%
Tx635 x Tx2785bmr	15.00 ^b	30.82 ^a	54.56 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	72.82 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	88.03 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%	91.93 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=5.6%
CMSxS206 x Tx2784	16.57 ^b	23.61 ^b	40.45 ^b	58.67 ^b	72.18 ^c	83.93 ^b
Tx636 x Tx2785	14.76 ^bc	24.24 ^b	43.29 ^b	63.42 ^b	77.41 ^b	82.88 ^b
BRS 801	12.65 ^c	20.59 ^b	42.69 ^b	60.45 ^b	78.92 ^b	85.53 ^b

	a (%)	b (%)	c (%/h)	ED 2%/h	ED 5%/h	ED 8%/h	R²
BR007 x Tx2784bmr	19.19	75.69	5.00	73.3	57.0	48.3	0.992
Tx635 x Tx2785bmr	12.97	80.13	5.58	72.0	55.2	45.9	0.993
CMSxS206 x Tx2784	14.22	71.73	3.64	60.5	44.4	36.7	0.990
Tx636 x Tx2785	11.82	72.96	4.64	62.8	46.9	38.6	0.989
BRS 801	9.43	78.62	4.21	62.7	45.4	36.5	0.987

Hybrid^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%	Period (h)
	0	6	12	24	48
BR007 x Tx2784bmr	27.89 ^c	71.74 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%	79.70 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%	89.44 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%	94.77 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%
Tx635 x Tx2785bmr	36.09 ^b	66.28 ^b	76.67 ^ab	86.45 ^ab	94.07 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%
CMSxS206 x Tx2784	35.10 ^b	63.87 ^b	74.35 ^bc	81.84 ^c	87.95 ^b
Tx636 x Tx2785	33.60 ^b	63.76 ^b	73.48 ^bc	83.39 ^bc	90.67 ^ab
BRS 801	39.85 ^a a Mean values followed by the same letter in a column do not differ by SNK test (p>0.05); CV=2.9%	57.31 ^c	70.52 ^c	82.58 ^bc	90.31 ^ab

	a (%)	b (%)	c (%/h)	ED (2%/h)	ED (5%/h)	ED (8%/h)	R²
BR007 x Tx2784bmr	28.47	63.56	16.71	85.2	77.4	71.5	0.988
Tx635 x Tx2785bmr	36.80	55.68	11.16	84.0	75.3	69.2	0.992
CMSxS206 x Tx2784	35.53	50.83	12.54	79.4	71.9	66.6	0.994
Tx636 x Tx2785	34.34	54.55	11.30	80.7	72.2	66.3	0.992
BRS 801	39.65	52.36	7.20	80.6	70.5	64.4	0.999

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Ruminal degradability of brown-midrib sorghum-sudangrass hybrids for cutting and grazing1 1 Parte da Tese de Doutorado em Zootecnia da primeira autora, apresentada na Universidade Federal de Minas Gerais/UFMG

Degradabilidade ruminal de híbridos de sorgo sudão para corte e pastejo portadores de nervura marrom

ABSTRACT

Ruminal degradability of brown-midrib sorghum-sudangrass hybrids for cutting and grazing¹ 1 Parte da Tese de Doutorado em Zootecnia da primeira autora, apresentada na Universidade Federal de Minas Gerais/UFMG